Massachusetts Landlord-Tenant Law 2026 Complete Guide: MGL c.186 §15B Security Deposits, Notice Requirements, Summary Process Eviction, No Rent Control, and Boston-Area Compliance

1. Massachusetts Landlord-Tenant Law: 2026 Overview

Massachusetts residential landlord-tenant law is primarily governed by:

• MGL c.186 (Estates for Years and at Will) — the primary statute covering security deposits (§15B), tenancy creation and termination, quiet enjoyment (§14), and anti-retaliation (§18).
• MGL c.239 (Summary Process) — the eviction statute governing all residential and commercial dispossessory proceedings.
• MGL c.151B (Prohibition of Discrimination in Credit, Housing, and Public Accommodations) — anti-discrimination, including source-of-income protection.
• 105 CMR 410 (Minimum Standards of Fitness for Human Habitation) — the State Sanitary Code; defines the baseline habitability floor for all Massachusetts rental housing.
• MGL c.93A (Consumer Protection Act) — unfair or deceptive trade practices in landlord-tenant transactions; allows double or treble damages + attorney fees for willful violations.

Massachusetts does NOT have a Uniform Residential Landlord and Tenant Act (URLTA) adoption. Instead, it has built a distinct body of statute and common law over 50+ years that tends to favor tenants more than most non-URLTA states.

What Makes Massachusetts Unusual Among All 50 States

2. MGL c.186 §15B: Security Deposit Law — Complete Breakdown

MGL c.186 §15B is the statute most Massachusetts landlords encounter first — and where the most costly landlord errors occur. The statute contains a chain of seven discrete obligations; missing any single link in that chain costs the landlord all deduction rights.

2.1 The Security Deposit Cap

Under §15B(1)(b), the maximum security deposit a Massachusetts landlord may collect is ONE MONTH'S RENT — period. No exceptions for furnished units, luxury properties, or short lease terms. This is among the lowest caps in the US (California is also one month; Michigan is 1.5 months; Arizona is 1.5 months; Texas, Florida, and Indiana have no statutory cap).

The cap applies to each individual unit: a landlord with a 10-unit building may collect one month's security deposit per unit, but may never collect two months' rent as a security deposit for a single unit regardless of circumstances. Lease clauses purporting to collect a higher security deposit are void and unenforceable under Massachusetts law.

2.2 The Thirty-Day Banking Obligation

Within 30 days of receiving the security deposit, the landlord must:

1. Open a separate, interest-bearing account at a Massachusetts FDIC-insured bank. "Separate" means the account must hold ONLY the security deposit for this one tenancy — it cannot be commingled with the landlord's personal funds, operating accounts, or even the security deposits from other tenants.
2. Provide the tenant a written receipt containing:
   • The name and complete address of the bank
   • The account number
   • The type of account (savings, money market, etc.)
   • The current rate of interest

This written receipt obligation is the first point of failure for Massachusetts landlords. Collecting the deposit at lease signing and depositing it in a commingled account — even temporarily — violates §15B. Failing to provide the written receipt within 30 days also violates §15B, even if the underlying deposit was properly banked.

2.3 Annual Interest Obligation

Under §15B(2)(d), the landlord must pay the tenant interest on the security deposit at the rate of 5% per year OR the actual interest earned by the account, whichever is greater, within 30 days of each anniversary of the date the deposit was received.

The landlord has three options for paying the interest:

• Direct payment: Send the tenant a check for the accrued interest.
• Rent credit: Credit the interest against the next month's rent (tenant pays $2,400 rent, landlord credits $120 interest, tenant pays $2,280 net).
• Deposit deduction: Deduct the interest from the security deposit at the tenant's written request (uncommon and not recommended — reduces the deposit balance held).

If the landlord fails to pay or credit the annual interest when due, the tenant has the statutory right to deduct the unpaid interest directly from their rent payment — and a landlord who then attempts to evict for non-payment of rent will find the court deducting the unpaid interest from any rent judgment.

2.4 Bank Change Notification

If the landlord transfers the security deposit to a different bank or financial institution, the landlord must notify the tenant in writing within 30 days of the transfer, providing the new bank's name, address, and the new account number. This obligation is frequently overlooked when landlords refinance, change banking relationships, or sell a property with existing tenants — all three events commonly result in security deposits moving to new accounts.

2.5 Return Deadline and Itemized Statement

The security deposit must be returned within 30 days after BOTH of the following:

• (a) The tenancy ends (the tenant vacates), AND
• (b) The landlord receives the tenant's written forwarding address.

This dual-trigger mechanism means the 30-day clock does not start running until the landlord actually has the forwarding address in writing. If a tenant moves out in silence — leaves the keys and disappears — and the landlord cannot locate a forwarding address, the 30-day deadline has technically not started. However, landlords in this situation should document their attempts to obtain a forwarding address and return the deposit to the last known address or hold it in trust, because courts can find constructive notice in some circumstances.

The return must be accompanied by:

• A written itemized statement of each deduction claimed.
• Copies of written statements from contractors or vendors for any repair work performed, showing the actual costs.
• Written estimates if the actual repair costs are not yet determined at the 30-day mark (if so, the landlord must send the itemized statement within 30 days with estimates, then provide actual bills within a reasonable additional period).

2.6 Allowable Deductions

Massachusetts landlords may deduct from the security deposit:

• Unpaid rent lawfully owed by the tenant.
• Unpaid utility charges the tenant is expressly required to pay under the lease.
• Reasonable repair costs for damage to the unit caused by the tenant beyond normal wear and tear, documented with receipts or estimates.

Landlords may NOT deduct for:

• Normal wear and tear (carpet wear from normal use, minor scuffs on walls, faded paint).
• Pre-existing damage that was present when the tenant moved in and documented on a move-in checklist.
• Routine cleaning if the unit was left in a reasonably clean condition.
• Damage caused by the landlord's own failure to maintain the unit.

2.7 The Penalty Structure: Why §15B Compliance Is Non-Negotiable

MGL c.186 §15B(7) contains two distinct but cumulative penalties:

§15B(7)(a) — Procedural Non-Compliance → Loss of ALL Deduction Rights: If the landlord fails to comply with ANY of the following requirements — the 30-day bank deposit obligation, the written receipt requirement, the annual interest obligation, or the bank change notification — the landlord loses all right to make any deduction from the security deposit. This includes deductions for legitimate unpaid rent and documented tenant-caused damage. The landlord who forgot to open a separate account for the security deposit cannot deduct even $5,000 in documented damage at move-out.

§15B(7)(b) — Wrongful Withholding → Treble Damages: If a court finds that the landlord wrongfully withheld any portion of the security deposit (either without compliance with the §15B banking requirements, or by deducting for items that do not qualify), the landlord is liable for THREE TIMES the amount wrongfully withheld, plus reasonable attorney fees and court costs. On a $2,400 deposit (one month's rent on a typical Boston apartment), treble damages alone can reach $7,200 — plus $3,000-$8,000+ in attorney fees — making the landlord's total exposure $10,000-$15,000+ on a single mishandled deposit.

Massachusetts courts interpret §15B strictly. A landlord who collected the deposit properly, banked it separately, paid annual interest, and then failed to provide the itemized statement within 30 days of receiving the forwarding address has still lost all deduction rights. The courts view §15B as a comprehensive consumer protection statute, not a best-efforts guideline.

2.8 Practical Banking Setup Recommendation

Best practice for Massachusetts landlords:

1. At lease signing, accept the security deposit check but do NOT deposit it with personal funds.
2. Within 7-10 days: open a dedicated savings account at a Massachusetts bank labeled with the tenant's name and unit address. Deposit the security deposit into this account.
3. Within 30 days: provide the tenant a written receipt (via email with delivery confirmation, or certified mail) containing the bank name/address, account number, account type, and interest rate. Keep a copy in the tenant's file.
4. Set a recurring annual calendar reminder to pay or credit 5% interest on the anniversary date of receiving the deposit.
5. At any bank change: send written notification to the tenant within 30 days.
6. At move-out: obtain the tenant's forwarding address in writing on the move-out inspection checklist or a separate form. Then set a 30-day deadline in your calendar to return the deposit (minus any documented deductions) with itemized statement and receipts.

3. Last Month's Rent and Key/Lock Deposits

3.1 Last Month's Rent Prepayment (MGL c.186 §15B(1)(a))

Massachusetts landlords commonly collect a "last month's rent" in addition to the security deposit. The last month's rent is technically prepaid rent — not a security deposit — but MGL c.186 §15B applies virtually identical requirements to it:

• Must be deposited in a separate, interest-bearing Massachusetts bank account within 30 days.
• Written receipt required within 30 days (same four elements: bank name, address, account number, account type).
• Annual interest at 5% (or actual rate, whichever is higher) must be paid to the tenant within 30 days of each anniversary.
• Bank change notification required.
• When applied at the end of the tenancy, the landlord must provide an accounting of how the last month's rent was applied.

Unlike the security deposit, the last month's rent is not separately capped at one month's rent — it IS one month's rent by definition. So total upfront collections at lease signing in Massachusetts are typically: first month's rent + last month's rent + one month's security deposit = three months' equivalent at move-in.

INTEREST ON LAST MONTH'S RENT: If the rent increases during the tenancy, the last month's rent account may be below the final month's rent amount. The landlord may request the tenant top up the last month's rent account to match the new rent, with at least 30 days' notice, subject to the same interest-bearing account requirements.

3.2 Key and Lock Device Deposit (MGL c.186 §15B(1)(c))

A landlord may charge a separate key or lock device deposit, subject to a cap of $5.00 OR the actual documented cost of the key/lock device, whichever is applicable:

• If the cost is $5 or less: landlord may charge up to $5.
• If the cost exceeds $5: landlord may charge the actual cost, BUT must provide the tenant a written receipt showing the actual cost and a description of the key/lock device at the time of collection.

This deposit is also subject to the same interest-bearing banking requirements as the security deposit. In practice, most Massachusetts landlords skip the key deposit given the administrative burden relative to the small amount involved — it is typically more trouble than it is worth for anything under $25-50.

4. Notice to Quit Requirements: Non-Payment and At-Will Termination

4.1 Tenancy at Will: The Default Massachusetts Tenancy Form

Most Massachusetts residential tenancies are tenancies-at-will: month-to-month arrangements that continue until either party gives proper notice. Fixed-term leases (typically 12 months) automatically convert to tenancies-at-will when the tenant holds over and the landlord accepts rent beyond the lease expiration — a very common occurrence in the Boston market.

4.2 Notice to Quit for Non-Payment of Rent

For a tenancy-at-will with non-payment of rent, the landlord must serve the tenant a written 14-day Notice to Quit. The notice must:

• Be in writing.
• Specify the amount of rent claimed to be owed.
• Demand that the tenant quit and deliver up possession of the premises within 14 days.
• Be served on the tenant by (a) constable service, (b) certified mail, or (c) leaving it at the tenant's last and usual place of abode.

CRITICAL DISTINCTION — This is NOT a "Pay or Quit" Notice: A Massachusetts Notice to Quit for non-payment is not, strictly speaking, a "pay or quit" in the way that term is used in California, New Jersey, or Oregon. In Massachusetts, the landlord retains discretion about whether to accept a curing payment. If the landlord accepts the overdue rent AFTER serving the notice to quit, this waives the notice and the landlord must start the process again from scratch if the tenant subsequently defaults. By contrast, if the landlord refuses tender of the overdue rent, the Summary Process filing may proceed after the 14-day period.

This is a high-stakes decision point: a landlord who accepts partial payment after serving a non-payment notice has waived it. Most Boston-area landlord-tenant attorneys advise landlords to clearly communicate in writing at the time of any post-notice tender whether they are accepting payment as a cure (waiving the notice) or accepting payment "under protest and without waiver" — though the latter is legally complex and should not be attempted without counsel.

4.3 Notice to Terminate a Tenancy at Will (No Fault)

To terminate a tenancy at will without fault, either the landlord or tenant must give at least 30 days' written notice, and the notice must expire on the last day of a rental period. This is different from a "30 calendar days from service" standard used in many other states.

Example: Rent is due on the 1st of each month. Landlord serves a 30-day termination notice on August 15. The earliest this notice can expire is September 30 — not September 14, which is 30 days from service. The notice must cover one full rental period ending on the last day of a month. If the landlord wants to terminate effective September 30, the notice must be served NO LATER THAN August 31.

For week-to-week tenancies, the notice period is 7 days.

4.4 Notice for Lease Violations Other Than Non-Payment

For material lease violations (unauthorized subletting, pet violations in no-pet leases, repeated noise complaints), Massachusetts practice typically involves a 30-day notice to cure or quit. However, unlike some states (New Jersey, California, Oregon), Massachusetts does not have a separate statutory "cure or quit" notice form for lease violations — the landlord's notice must be carefully drafted. Massachusetts courts have been known to scrutinize the adequacy of notice for non-payment evictions, and tenants represented by legal aid will frequently challenge the adequacy of any notice served.

4.5 Fixed-Term Lease Expiration

If a tenant under a fixed-term lease vacates at the natural expiration of the lease term, no notice to quit is required — the lease itself constitutes the notice. If the tenant holds over after the lease expires and the landlord accepts rent, a tenancy at will is created and the landlord must then use the 30-day notice procedure to terminate it.

5. Summary Process Eviction (MGL c.239): Step-by-Step

Massachusetts eviction is called "Summary Process" (a historical term meaning expedited civil process). It is governed by MGL c.239 and the Summary Process Rules of the Housing Court and District Court. The process is:

Step 1: Serve the Notice to Quit

Serve the appropriate notice (14-day for non-payment; 30-day for at-will termination or lease violation) on the tenant by constable, certified mail, or hand delivery to the tenant's usual place of abode. Obtain proof of service — constable return of service is preferred because it is court-accepted documentary proof.

Step 2: Wait for the Notice Period to Expire

Do NOT file the court complaint until the notice period has fully expired. Filing before the notice expires will result in dismissal without prejudice.

Step 3: File the Summary Process Complaint

File a Complaint for Possession (SUMMONS AND COMPLAINT — SUMMARY PROCESS, the standard court form) in the appropriate Housing Court or District Court for the county where the property is located. Pay the filing fee (approximately $135-$195 for Housing Court as of 2026, subject to court adjustments). The clerk will assign an "Entry Day" (the date the complaint is docketed) and a "Hearing Day."

Step 4: Service of Summons

After filing, the court will issue a Summons. The Summons must be served on the defendant-tenant by a licensed constable or deputy sheriff at least 7 days before the Hearing Day. Personal service on the tenant is preferred; "nail and mail" (posting to the door and mailing) is permissible if the tenant cannot be served personally after due diligence.

Step 5: Tenant's Answer

The tenant must file a written Answer (the standard court form) before the Hearing Day. In the Answer, the tenant may raise defenses and counterclaims — including habitability defenses (rent abatement for code violations under MGL c.239 §8A), security deposit violations, anti-retaliation claims, and quiet enjoyment violations. A tenant with a §15B counterclaim for treble damages (because the landlord mishandled the security deposit) may use that claim as a setoff against any rent judgment the landlord seeks.

Step 6: Hearing Day

The Housing Court hearing is typically a pretrial conference. The judge or clerk-magistrate reviews the filings, hears brief presentations, and either: (a) enters a default judgment for the landlord if the tenant failed to file an Answer and does not appear, (b) schedules a trial date, or (c) refers the parties to a Housing Specialist (a court-employed mediator unique to the Massachusetts Housing Court system). Housing Court Housing Specialists are trained mediators who frequently facilitate payment plans and move-out agreements before trial, reducing contested cases significantly.

Step 7: Trial

If the case is not resolved at the pretrial stage, trial is typically scheduled 2-4 weeks after the initial Hearing Day. At trial, the landlord must prove: valid notice to quit was served, the notice period expired, and the grounds for eviction exist (e.g., unpaid rent of a specified amount). The tenant may present counterclaims and defenses. The judge may award the landlord possession, a money judgment for unpaid rent, or both — but may also offset rent withholding for habitability defenses, reducing or eliminating the money judgment.

Step 8: Judgment, Appeal Period, and Execution

If the landlord wins a judgment for possession, the judgment does not immediately authorize physical removal of the tenant. The tenant has 10 days to appeal to the Appellate Division (Housing Court) or District Court Appellate Division. If no appeal is filed within 10 days, the landlord may request an Execution for Possession. The Execution is the court document authorizing a licensed constable or deputy sheriff to physically remove the tenant and their belongings.

Step 9: Constable Enforcement of Execution

The constable must give the tenant 48 hours' advance written notice before executing the removal (MGL c.239 §3). The constable removes the tenant's belongings to the curb or to a storage facility (at the landlord's direction and cost). The entire process from filing to removal in an uncontested non-payment case typically takes 4-6 weeks in Massachusetts, compared to 2-3 weeks in states like Georgia, Arizona, or Texas.

Typical Massachusetts Summary Process Timeline

6. Massachusetts Housing Court System

Massachusetts is one of very few US states with a dedicated, statewide Housing Court system — a specialized court branch that handles all residential landlord-tenant matters. The Housing Courts have judges, clerks, and Housing Specialists who handle exclusively housing matters, resulting in more legally consistent rulings and more efficient case management than general District Courts.

Landlords may also file Summary Process cases in District Court (any county), which offers a faster initial hearing date in some districts but lacks the Housing Court's dedicated housing specialists and tends to produce less consistent outcomes in complex cases.

Housing Specialists: A unique feature of the Massachusetts Housing Court system. Housing Specialists are trained mediators on the court's staff who meet with parties before the hearing to explore settlement options — payment plans, voluntary move-out agreements with additional time in exchange for the tenant leaving the unit in good condition, or agreements to repair habitability issues in exchange for rent reduction. Approximately 40-60% of Housing Court cases in Massachusetts are resolved through Housing Specialist mediation without going to trial, which benefits both landlords (faster resolution, less attorney cost) and tenants (avoidance of eviction judgment on credit record).

Eastern vs. Northeast Housing Courts: Essex County is split between the Eastern Housing Court (covering the southern portion, including Lynn, Peabody, Salem, Saugus, Swampscott, Marblehead, and Beverly) and the Northeast Housing Court (covering the northern portion, including Lawrence, Haverhill, Newburyport, Gloucester, and Ipswich, as well as Lowell and other northeast Middlesex County cities). File in the court that covers the municipality where the property is located.

7. MGL c.186 §14: Quiet Enjoyment and Anti-Lockout

MGL c.186 §14 is Massachusetts' quiet enjoyment and anti-self-help statute. It provides that any person who attempts to regain possession of residential premises by any means other than a duly-executed Summary Process shall be liable to the tenant for damages not less than THREE MONTHS' RENT or actual damages (whichever is GREATER), plus reasonable attorney fees and court costs.

What Constitutes a §14 Violation

Acts that constitute interference with quiet enjoyment under MGL c.186 §14 include:

• Changing the locks or installing a new lock while the tenant is still in possession — even if the tenant is behind on rent or the lease has expired.
• Removing the tenant's possessions from the unit without court order.
• Shutting off utilities (heat, electricity, gas, water) to force the tenant to leave.
• Removing or damaging doors, windows, or plumbing fixtures to make the unit uninhabitable.
• Repeated harassment — frequent unannounced entries, intimidation, threats — designed to induce the tenant to leave.
• Padlocking a unit or placing the landlord's own lock on the door without court-issued execution.

The Financial Exposure from a §14 Violation

The three-months' rent minimum damages make §14 violations extremely expensive. Consider:

• Tenant paying $2,500/month: minimum §14 damages = $7,500 (even if the tenant is re-housed the same day).
• Tenant paying $3,500/month: minimum §14 damages = $10,500.
• If the tenant suffered actual damages exceeding three months' rent (hotel costs, storage fees, loss of belongings, emotional distress documented in court), those higher actual damages apply.
• Attorney fees in Massachusetts landlord-tenant cases typically run $3,000-$10,000+ for the tenant's counsel in a well-documented §14 case.
• If the landlord's conduct also constitutes an unfair or deceptive trade practice (MGL c.93A), additional double or treble damages may be awarded on top of the §14 damages.

The practical takeaway: there is no financial scenario in which a Massachusetts landlord benefits from a self-help eviction. The cost of completing a proper Summary Process (filing fee, constable service, attorney fees if contested) is a small fraction of a §14 judgment. Always use the court process.

8. Implied Warranty of Habitability and State Sanitary Code (105 CMR 410)

Massachusetts does not have a URLTA-style statutory habitability provision. Instead, the habitability obligation arises from two sources:

• Common law: The Massachusetts Supreme Judicial Court (SJC) in Berman & Sons, Inc. v. Jefferson, 379 Mass. 196 (1979), established that a landlord leasing residential property impliedly warrants that the premises are fit for human habitation and that this warranty runs through the tenancy.
• 105 CMR 410 — Minimum Standards of Fitness for Human Habitation: The State Sanitary Code, enforced by local Boards of Health and Inspectional Services Departments (ISDs), sets the objective floor for habitability. Violations of 105 CMR 410 create the legal basis for habitability claims in Massachusetts court.

Key 105 CMR 410 Requirements for Landlords

• Heat: Minimum 68°F in every habitable room and bathroom from September 15 through June 15 (the "heating season").
• Hot water: Minimum 120°F at all fixtures; maintained year-round.
• Smoke detectors: Ionization alarms on every floor and in every room used for sleeping; interconnected in buildings of 3 or more units; landlord responsible for installation, tenant responsible for maintenance in their own unit.
• Carbon monoxide detectors: Required in any unit with fuel-burning appliances; landlord responsible for installation and working condition.
• Structural integrity: Roof, floors, walls, ceilings, windows, and exterior doors must be weathertight, watertight, and rodent-proof.
• Pest control: Landlord responsible for extermination of rodents, cockroaches, insects, and similar pests (except in single-family homes where the tenant has exclusive control).
• Lead paint: Properties built before 1978 must comply with Massachusetts Lead Law (MGL c.111 §§197-199B); landlords must abate or encapsulate lead paint in any unit occupied by a child under 6. Failure to comply carries serious liability.

Tenant Remedies for Habitability Violations

• Board of Health complaint: Tenant files written complaint with local Board of Health or ISD; inspector visits, issues violation orders, gives landlord cure deadline. If landlord fails to cure, Board can file a criminal complaint for c.111 §127L violations or pursue civil enforcement.
• Rent withholding (MGL c.239 §8A): If the unit fails to comply with code requirements AND the landlord received written notice of the violation AND the condition materially affects health or safety, the tenant may use rent withholding as a defense in Summary Process. The court calculates the fair rental value of the unit in its defective condition as a percentage of contract rent — the difference is the tenant's "rent credit." Judges use the "percentage reduction in value" method, which can result in 20-50% rent reduction orders in severe cases.
• Court action for rent abatement: Tenant may proactively sue for rent abatement in Housing Court or District Court for habitability violations independent of an eviction proceeding.

Note: Massachusetts does NOT have a statutory repair-and-deduct remedy. Unlike California (CC §1942), Texas (Prop. Code §92.0561), or Arizona (ARS §33-1363), Massachusetts tenants cannot unilaterally hire a contractor to repair a habitability defect and deduct the cost from rent. Their remedies are through code enforcement agencies and the court system.

9. MGL c.186 §18: Anti-Retaliation

MGL c.186 §18 prohibits landlords from retaliating against tenants who engage in legally protected activities. A "retaliatory act" is broadly defined to include filing for eviction, increasing rent, decreasing services, or taking any other adverse action against the tenant within the period of the presumption.

Protected Tenant Activities Under §18

• Filing a complaint with any state or local agency about the condition of the premises or the landlord's failure to comply with housing code requirements.
• Organizing, joining, or participating in a tenants' union, association, or collective.
• Testifying or participating in any proceeding relating to housing conditions.
• Withholding rent as a habitability remedy under MGL c.239 §8A.
• Exercising any other right under state or local law.

The Six-Month Presumption

If a landlord takes any adverse action against a tenant within six months after the tenant engaged in a protected activity, the action is presumed retaliatory. The burden then shifts to the landlord to prove by a preponderance of evidence that the action was taken for a legitimate, non-retaliatory reason — and that the same action would have been taken regardless of the tenant's protected activity. This six-month presumption is one of the longest in any US state.

Practical consequence: If a tenant filed a Board of Health complaint on May 1 and the landlord served a 30-day notice to quit on July 1 (60 days later), the notice is presumptively retaliatory. The landlord must establish in court a non-retaliatory reason (e.g., documented non-payment, documented lease violation unrelated to the habitability complaint) that predates or is wholly independent of the complaint.

§18 Remedies

A tenant who successfully proves retaliation under §18 may:

• Remain in possession (the retaliatory notice to quit or eviction is voided).
• Recover money damages for harm caused by the retaliatory act.
• If the retaliation also constitutes a MGL c.93A unfair practice, recover double or treble damages plus attorney fees.

10. MGL c.151B: Anti-Discrimination and Source-of-Income Protection

Massachusetts anti-discrimination law (MGL c.151B) covers the full spectrum of housing transactions — advertising, application screening, selection, lease terms, and eviction. It is enforced by the Massachusetts Commission Against Discrimination (MCAD).

Protected Classes Under MGL c.151B in Residential Housing

• Race, color, national origin, ancestry
• Religion or creed
• Sex (including pregnancy, lactation, and reproductive health)
• Sexual orientation
• Gender identity and expression
• Disability (physical or mental)
• Age (ALL ages — Massachusetts protects minors as well as adults; the federal ADEA 40+ limitation does NOT apply to Massachusetts housing)
• Marital status
• Military or veterans' status
• Familial status (families with children under 18 in the household)
• Source of income — explicitly including public assistance and Section 8 / Housing Choice Vouchers (§4(10))

Source-of-Income Protection: What Massachusetts Landlords Must Know

MGL c.151B §4(10) prohibits discrimination based on a person's primary source of income — which includes wages, salaries, annuities, pension payments, public assistance, Social Security, and any housing voucher or rental subsidy program, including HUD Section 8 Housing Choice Vouchers (HCV). This means:

• You CANNOT advertise "No Section 8" or "HCV not accepted." This language is a per se violation of §4(10) and grounds for an MCAD complaint even if no specific tenant was harmed.
• You CANNOT reject a qualified applicant solely because they hold a housing voucher. If the applicant meets your standard screening criteria (credit, rental history, references), you must accept them if the unit passes the HQS inspection and the Housing Assistance Payment (HAP) contract is signed.
• You CAN apply standard, objective screening criteria consistently to all applicants, including voucher holders — income-to-rent ratios, credit score floors, eviction history, reference checks.
• You MUST cooperate with the Boston Housing Authority (BHA), Cambridge Housing Authority (CHA), or other local housing authority to schedule the required Housing Quality Standards (HQS) inspection and execute the HAP contract. A landlord who creates delays or obstructs the inspection process to avoid renting to a voucher holder may face an MCAD complaint for constructive discrimination.

Massachusetts source-of-income protection applies in the greater Boston metropolitan area, Worcester, Springfield, and all other Massachusetts municipalities. There is no rural exception. Owner-occupied properties — such as a landlord who rents a room in their own primary residence — may qualify for a limited exemption from some §4 provisions, but this exemption is narrow and counsel should be consulted before relying on it.

MCAD Complaint Process

A tenant or housing applicant who believes a Massachusetts landlord violated MGL c.151B files a complaint with the MCAD within 300 days of the alleged discriminatory act. The MCAD investigates, issues findings of "probable cause" or "no probable cause," and either pursues the case administratively or allows the complainant to pursue it in Superior Court. Remedies can include: compensatory damages (including emotional distress), back rent or actual economic damages, punitive damages, injunctive relief (requiring the landlord to rent to the complainant), civil penalties, and attorney fees. Massachusetts MCAD awards have reached into the six figures in documented cases of intentional discrimination.

11. No Rent Control: History and 2026 Legislative Status

11.1 Pre-1994: Boston, Cambridge, and Brookline Rent Control

Before November 1994, Massachusetts had three significant rent control regimes:

• Boston: Rent control enacted 1970 under home rule authority; covered buildings of 6+ units constructed before 1948; administered by the Boston Rent Equity Board; peak coverage approximately 30,000-40,000 units.
• Cambridge: Rent control enacted 1971; administered by the Cambridge Rent Control Board; covered a significant portion of Cambridge rental stock; peak coverage approximately 16,000-18,000 units.
• Brookline: Rent control in effect through 1994; smaller coverage than Boston or Cambridge.

11.2 The 1994 Referendum: Question 9

Massachusetts voters passed ballot Question 9 on November 8, 1994, with approximately 51% in favor statewide (though the vote was nearly exactly reversed within Cambridge and Boston, where majorities voted to keep rent control). Question 9 repealed all local rent control authority in Massachusetts, effective January 1, 1995. The repeal was immediate: tenants in previously rent-controlled units in Boston, Cambridge, and Brookline saw their rents move to market rate beginning January 1, 1995 — some overnight, some phased over a transition period depending on lease terms.

11.3 Post-1994 Landscape: No Rent Control 1995-2025

From January 1, 1995 through at least mid-2026, no Massachusetts municipality has had any form of rent control, rent stabilization, or rent cap in effect. Massachusetts landlords have had complete freedom to set market-rate rents and to increase rents at lease renewal or (for tenancies-at-will) with proper advance notice to the tenant.

11.4 2026 Legislative Status: Home Rule Petitions Pending

Multiple Massachusetts cities have pursued legislative channels to restore local rent stabilization authority. As of August 2026:

• Boston: The Boston City Council voted in 2023 to file a home rule petition with the Massachusetts General Court requesting authority to enact rent stabilization. The Stabilize Boston campaign backed the petition. As of 2026, the petition is under consideration by the state legislature but has NOT been enacted into law. No rent cap is in effect in Boston.
• Somerville: Somerville filed a home rule petition for rent stabilization; pending state legislative action; NOT in effect as of 2026.
• Cambridge: Cambridge has actively pushed for state legislative authorization and has participated in a coalition of Massachusetts cities seeking statewide legislation enabling local rent stabilization. NOT in effect as of 2026.
• Medford: Medford City Council passed a home rule petition in 2024; pending state legislature approval; NOT in effect as of 2026.

Bottom line for Massachusetts landlords in 2026: There is NO rent control, NO rent stabilization, and NO rent cap anywhere in Massachusetts. Landlords may charge and increase rents freely subject only to: (a) proper advance notice to the tenant (30 days for tenancy-at-will rent increases is best practice), (b) non-discrimination requirements, and (c) anti-retaliation restrictions. The pending home rule petitions bear watching — if the state legislature enacts enabling legislation, affected cities could move quickly to implement rent stabilization. But that legislation has not yet passed.

12. Boston Rental Market: Neighborhoods, September 1 Lease-Flip, and Local Rules

12.1 Boston's Unique September 1 Lease-Flip

Greater Boston's residential lease market is unlike any other US metro: approximately 85-90% of all Boston-area residential leases begin and end on September 1. This concentration is driven by the academic calendars of Boston's extraordinary cluster of universities — Harvard, MIT, Boston University (~35,000 students), Boston College (~15,000), Northeastern (~21,000), Tufts (Somerville/Medford; ~12,000), Emerson, Suffolk, Simmons, Wentworth, UMass Boston, and dozens of others collectively serving over 350,000 students.

The September 1 lease-flip creates several unique landlord obligations and risks:

12.2 Boston Neighborhood Rental Market Snapshot (2026)

• Allston-Brighton: The student capital of Boston; large concentration of BU/BC/Harvard Extension students; high turnover on September 1; 1BR typically $1,900-$2,500; 2BR (for student sharers) $2,400-$3,400; often furnished-unit market in August/September.
• Back Bay / Beacon Hill / Fenway: Premium neighborhoods; luxury segment; 1BR $2,800-$5,000+; strong demand from professionals and graduate students; longer lease durations, less September 1 concentration than Allston.
• South End / South Boston / Seaport: Mix of converted brownstones and new development; 1BR $2,400-$3,800; Seaport District driven by tech and biotech employers; BMR (Below Market Rate) units required in new large developments under Boston's Inclusionary Development Policy.
• Jamaica Plain / Roxbury: Gentrifying; 1BR $1,700-$2,600; historically affordable relative to Back Bay and Fenway; significant community land trust presence.
• East Boston / Dorchester / Mattapan: More affordable; 1BR $1,500-$2,200; workforce housing; significant immigrant communities; strong Section 8 voucher utilization.
• Cambridge / Somerville: Technically separate cities but functionally Boston rental market; Kendall Square biotech cluster drives 1BR $2,500-$4,000+ near MIT; Porter/Davis/Inman Square 1BR $2,000-$3,000.

12.3 Boston Inclusionary Development Policy (IDP)

New residential developments in Boston of 10 or more units must include a percentage of income-restricted affordable units (typically 13% on-site at 70% AMI, or 18% off-site/in-lieu payment). This applies to new construction and certain major rehabs. IDP units are subject to long-term deed restrictions and separate rent-setting rules administered by the Mayor's Office of Housing. Landlords with IDP-restricted units must comply with separate reporting, tenant selection (lottery), income verification, and rent-setting requirements in addition to the general MGL c.186 framework.

12.4 Short-Term Rentals in Boston

Boston regulates short-term rentals (STR) through the Boston Short-Term Rental Ordinance. Owner-occupied units and owner-adjacent units (e.g., a landlord renting one unit in their own building while living in another unit of the same building) may be registered as STRs with the City; non-owner-occupied "investor units" are prohibited from operating as short-term rentals in Boston. Landlords who operate unregistered STRs or non-permitted investor STRs face significant fines and potential summary process proceedings from the City.

See our Boston rent increase 2026 guide for the complete city-specific rent increase law analysis.

13. Worcester and Springfield: Housing Courts and Local Context

13.1 Worcester (Worcester Housing Court Jurisdiction)

Worcester is Massachusetts' second-largest city (~210,000 population) and the county seat of Worcester County. The Worcester Housing Court covers all landlord-tenant matters in Worcester County, with sessions at 225 Main Street, Worcester and at Fitchburg District Court for north Worcester County.

Major Worcester rental demand drivers:

• UMass Memorial Medical Center: Worcester County's largest private employer (~8,000 employees); Level I Trauma Center; academic medical center affiliated with UMass Chan Medical School. Medical residents and fellows drive strong demand for 1BR and studio apartments near the medical school (55 Lake Avenue North).
• UMass Chan Medical School: The only public medical school in Massachusetts; located on the UMass Medical School campus; strong rental demand from medical students.
• WPI (Worcester Polytechnic Institute): Private research university (~7,500 students); strong STEM programs; near Highland Street neighborhood; 1BR near WPI $1,400-$2,000.
• Clark University: Private liberal arts university (~4,000 students); Main South neighborhood; historically lower-cost housing stock.
• Holy Cross: Private liberal arts college (~3,000 students); on College Hill; 1BR nearby $1,300-$1,800.

Worcester lease patterns are more distributed than Boston — September 1 is still the dominant lease-start for student housing, but year-round leasing is more common for non-student tenants. Rents in Worcester are significantly lower than Boston: 1BR $1,200-$1,900; 2BR $1,500-$2,400.

See our Worcester MA rent increase 2026 guide for detailed rent increase law analysis.

13.2 Springfield (Western Housing Court Jurisdiction)

Springfield (~155,000 population) is the largest city in western Massachusetts and the economic center of the Pioneer Valley. The Western Housing Court covers all landlord-tenant matters in Hampden, Hampshire, Franklin, and Berkshire counties, with sessions at 37 Elm Street, Springfield and at Greenfield District Court for the northern counties.

Major Springfield rental demand drivers:

• Baystate Medical Center: Baystate Health System's flagship; Level I Trauma Center; one of two Level I Trauma Centers in Massachusetts (along with Boston Medical Center); ~6,000 employees; 759 Chestnut Street. Baystate is the Pioneer Valley's largest employer, and medical workers are a significant renter demographic in the Upper Hill and Forest Park neighborhoods.
• MGM Springfield: Opened August 24, 2018; Massachusetts' first commercial casino resort; 3 Main Street downtown; ~2,000 permanent employees; drove rental demand in downtown Springfield and adjacent neighborhoods post-2018.
• Springfield Armory National Historic Site: NPS-managed site at One Armory Square; the oldest continuously operating US military arsenal (1794-1968); now museum; modest employment.
• American International College, Springfield College, Western New England University: Three colleges located within Springfield; combined ~10,000-12,000 students; drive student rental demand primarily in the Sixteen Acres and East Springfield neighborhoods.

Springfield rents are among the lowest in Massachusetts: 1BR $900-$1,500; 2BR $1,100-$1,900. The Springfield rental market has a higher proportion of Section 8 voucher utilization than Boston or Worcester — reflecting the city's lower median income — making source-of-income compliance under MGL c.151B §4(10) particularly relevant for Springfield landlords.

See our Springfield MA rent increase 2026 guide for detailed rent increase law analysis.

14. Military Installations and SCRA Obligations

Massachusetts has a moderate military presence relative to states like Florida, Texas, or Virginia, but Massachusetts-based servicemembers and their families are entitled to full Servicemembers Civil Relief Act (SCRA, 50 U.S.C. §§3901-4043) protections in all Massachusetts residential leases.

Key Massachusetts Military Installations

• Hanscom Air Force Base (Bedford/Lincoln, Middlesex County): Home of the Air Force Life Cycle Management Center (AFLCMC) and MIT Lincoln Laboratory (a major federal FFRDC); approximately 10,000 military personnel, civilian employees, and contractor staff; significant rental demand in Bedford, Lexington, Concord, Burlington, and Woburn (Eastern Housing Court jurisdiction).
• Fort Devens / Devens Reserve Forces Training Area (Devens, Ayer; Worcester County): Army Reserve and National Guard training installation; approximately 3,500 military and civilian personnel; rental demand in Ayer, Shirley, Harvard MA, Fitchburg, and Leominster (Worcester Housing Court jurisdiction).
• United States Coast Guard Sector Boston / Air Station Cape Cod: USCG Sector Boston is at 427 Commercial Street, Boston; Air Station Cape Cod is at 1 Coast Guard Drive, Bourne; combined ~500-700 active duty personnel.
• Massachusetts National Guard: Headquartered at Milford, with multiple armories statewide; approximately 15,000 Guard and Reserve members across Massachusetts, most of whom are civilians in their primary careers but may be activated for deployment.

SCRA Key Provisions for Massachusetts Landlords

• Early lease termination: A servicemember who receives deployment orders for more than 90 days, or a permanent change of station (PCS) order, may terminate a residential lease with 30 days' written notice + a copy of the deployment/PCS orders. The termination is effective 30 days after the first date on which the next rent payment is due after the notice is delivered. The landlord MUST return the security deposit in full within 30 days of the effective termination date (accelerated return, regardless of the usual dual-trigger §15B rule).
• Interest rate cap: Residential mortgage obligations (not typically a landlord concern) are capped at 6% during active duty under SCRA.
• Eviction protection: A servicemember on active duty may not be evicted from a primary residence with monthly rent below the SCRA threshold (~$4,527.21/month in 2026, adjusted annually) without a court order granting relief after the court finds eviction is not materially affected by military service.
• Stay of proceedings: A servicemember who cannot appear in a Summary Process proceeding due to active military duty may request a mandatory stay of at least 90 days.

Massachusetts additionally provides that servicemembers who sign leases before receiving unexpected deployment or PCS orders are entitled to SCRA early termination rights retroactively — the SCRA provision applies from the date orders are issued, even if the lease was signed before orders were anticipated.

15. Major Massachusetts Employers and Rental Demand Drivers

Understanding where employment is concentrated helps Massachusetts landlords time lease renewals, set asking rents, and target tenant demographics.

Greater Boston / Cambridge: Life Sciences and Technology

• Mass General Brigham (MGB): Massachusetts' largest private employer (~80,000 employees statewide); formed from the 2019 merger of Partners HealthCare with Massachusetts General Hospital (MGH, ~30,000 employees) and Brigham and Women's Hospital (~22,000 employees); drives rental demand in the Longwood Medical Area, Fenway, and Mission Hill neighborhoods.
• Kendall Square Biotech Cluster (Cambridge): World's densest concentration of life sciences companies; home to Biogen, Moderna (NASDAQ:MRNA), Novartis Institute for Biomedical Research, Pfizer Cambridge Research, Sanofi Genzyme, AstraZeneca US headquarters, Bristol Myers Squibb, Genentech, Takeda, Vertex Pharmaceuticals; collectively employs ~25,000-35,000 highly paid scientists, engineers, and business professionals in Cambridge alone; primary driver of Cambridge 1BR rents of $2,500-$4,000+.
• Raytheon Technologies (RTX) — Waltham/Tucson: RTX Massachusetts operations (~8,000-10,000 employees; Waltham HQ for Intelligence & Space division); significant rental demand in Waltham, Newton, Lexington, and Burlington.
• Fidelity Investments (Boston): Private company; ~45,000 global employees; Boston HQ at 245 Summer Street; significant Seaport/South Boston professional rental demand.
• State Street Corporation (Boston): NYSE:STT; global custodian bank; ~12,000-14,000 Boston metro employees; Financial District HQ.
• Liberty Mutual Insurance (Boston): 175 Berkeley Street HQ; ~11,000 Boston metro employees; private; strong Back Bay and Copley Square rental demand.
• John Hancock / Manulife (Boston): 197 Clarendon Street (John Hancock Tower); ~3,000-4,000 Boston employees; Back Bay demand.
• Harvard University (Cambridge): ~20,000-22,000 employees (faculty, staff, researchers); Cambridge and Allston rental demand; $53B endowment (largest in US); Harvard also developing a major Allston Science Complex, which will add significant employment near the BU Bridge.
• MIT (Cambridge): ~13,000-14,000 employees; ~11,500 students; endowment ~$23B; Kendall Square and East Cambridge rental demand.

Worcester Region

• UMass Memorial Medical Center + UMass Chan Medical School: Combined ~12,000-15,000 employees; largest employer cluster in Worcester County.
• Hanover Insurance Group (Worcester): NYSE:THG; ~6,000 Massachusetts employees; 440 Lincoln Street Worcester HQ.
• Polar Beverages (Worcester): Private; largest independent sparkling water manufacturer in US; ~1,500 employees.

Springfield / Western Massachusetts

• Baystate Health (Springfield): ~12,000-13,000 Pioneer Valley employees; largest Pioneer Valley employer.
• MassMutual Financial Group (Springfield HQ): Fortune 78; private mutual; ~7,000 Springfield metro employees; 1295 State Street HQ; significant corporate professional tenant segment in Forest Park and Sixteen Acres.
• MGM Springfield (Springfield): ~2,000 employees; 3 Main Street downtown; contributed to post-2018 downtown revival and rental demand increase.

16. MA vs. Other States: Key Differences at a Glance

17. 10 Most Costly Massachusetts Landlord Mistakes in 2026

Mistake 1: Commingling the Security Deposit with Personal Funds

What happens: Landlord deposits the security deposit into their personal checking account or a shared operating account. This violates §15B(2)(a)'s separate-account requirement from the moment of deposit — before any other obligation even arises. Cost: Loss of all deduction rights under §15B(7)(a), including deductions for legitimate unpaid rent and documented damage, plus exposure to treble damages if the landlord then withholds any portion.

Mistake 2: Charging More Than One Month's Rent as Security Deposit

What happens: Landlord attempts to charge "two months' security deposit" (perhaps for a tenant with fair credit) or combines "security deposit + pet deposit" to exceed the one-month cap. Cost: The excess is void and unenforceable; the tenant may deduct the excess from rent; if tenant is forced to pay and then sues, the landlord faces liability for treble damages on the over-collected amount under MGL c.93A.

Mistake 3: Failing to Provide the Written Receipt Within 30 Days

What happens: Landlord opens a separate account and deposits the security deposit but forgets to send the written receipt with the bank name, address, account number, and interest rate to the tenant within 30 days. Cost: §15B(7)(a) applies — landlord loses the right to make any deduction from the deposit at move-out. A landlord who sent the receipt on day 31 has still violated the statute.

Mistake 4: Failing to Pay Annual Interest

What happens: Landlord collects the security deposit, banks it properly, provides the receipt, but then forgets the annual 5% interest obligation. Year 1 anniversary passes; year 2 passes. Tenant gives notice to vacate in year 3. Cost: The tenant has the right to retroactively deduct all unpaid interest from rent (up to the amount of unpaid interest) — and can raise this in court as a setoff against any rent arrearage claim the landlord files. Additionally, the failure to pay annual interest may constitute an independent §15B violation, potentially costing the landlord all deduction rights.

Mistake 5: Missing the 30-Day Return Deadline

What happens: Tenant moves out September 1 and leaves a forwarding address that same day. Landlord is busy with September 1 turnover, repairs, cleaning, and doesn't get the deposit back with itemized statement until October 5. Cost: The 30-day deadline expired October 1 (30 days after September 1 forwarding address receipt). The landlord who misses the deadline by even one day has, under §15B(7)(a), lost all right to deductions — even if the tenant caused $8,000 in documented damage. The deposit must be returned in full plus interest.

Mistake 6: Deducting for Normal Wear and Tear

What happens: Landlord deducts for routine carpet cleaning, minor scuff marks on walls, faded paint, worn threshold strips, and light fixture replacement — costs that arise from normal residential use over 2-3 years. Cost: Tenants who challenge these deductions often prevail; the court orders return of the improperly deducted amounts plus treble damages under §15B(7)(b). Massachusetts courts have decades of precedent defining normal wear and tear broadly.

Mistake 7: Self-Help Eviction (Lockout, Utility Shutoff)

What happens: Frustrated with a non-paying tenant, a landlord changes the locks, removes the tenant's belongings to the hallway, or shuts off the heat or electricity. Cost: MGL c.186 §14 mandatory minimum of 3 months' rent or actual damages (whichever is greater) + attorney fees. On a $2,500/month apartment, that's $7,500 minimum — plus attorney fees that can easily add $5,000-$10,000. The landlord also faces potential MGL c.93A liability for double or treble damages on top of the §14 damages, making total exposure $20,000-$35,000+ on a single wrongful lockout.

Mistake 8: Posting "No Section 8" in Rental Advertisements

What happens: Landlord posts a listing on Craigslist, Zillow, or a building sign advertising "No Section 8" or "Income verification required — subsidies not accepted." Cost: This is per se discrimination under MGL c.151B §4(10), actionable even without a specific injured applicant. MCAD may investigate on its own initiative; fair housing testers may document the violation; an applicant who saw the advertisement has standing to file a complaint. MCAD remedies can include civil penalties and injunctive relief requiring the landlord to rent to Section 8 applicants on the same basis as others.

Mistake 9: Retaliating Within Six Months of a Board of Health Complaint

What happens: Tenant files a Board of Health complaint in April. Landlord, annoyed, serves a 30-day termination notice in July (3 months later). Cost: The notice is presumptively retaliatory under MGL c.186 §18 because it falls within the 6-month window. In Housing Court, the landlord must overcome the presumption by establishing an independent non-retaliatory reason for the termination. If the landlord cannot, the eviction is dismissed, the tenant remains in possession, and may be awarded damages. The landlord wasted the attorney fees for a Summary Process that was doomed from the notice date.

Mistake 10: Ignoring the September 1 Deposit Return Calendar for Multiple Units

What happens: A Boston landlord with a 6-unit building has all leases ending September 1. All six tenants provide forwarding addresses between September 1-5. The landlord now has six simultaneous 30-day deposit return deadlines running — plus six sets of inspections to complete, deductions to document, invoices to gather, and itemized statements to prepare — all due by October 1-5. Cost: A disorganized landlord who misses even one deadline faces the full §15B(7) penalty for that unit. For a 6-unit Boston building with $2,400 deposits per unit, missing two of six deadlines due to September chaos costs $4,800 in lost deductions and potential treble damages exposure of $14,400+ per missed unit.

18. 10-Step MGL c.186 §15B Compliance Checklist

1. At lease signing: Collect security deposit (maximum one month's rent), last month's rent, and key deposit (if any). Issue receipt for amounts received at time of collection.
2. Within 7 days of receiving deposit: Open a dedicated, separate savings or money market account at a Massachusetts FDIC-insured bank. Label the account with the tenant's name and unit address. Deposit the security deposit (and last month's rent, in a separate account) into the respective accounts. Do NOT commingle with other funds.
3. Within 30 days of receiving deposit: Provide tenant a written receipt containing: (a) name and address of the bank, (b) account number, (c) type of account, (d) current interest rate. Deliver by email with delivery confirmation, certified mail, or hand delivery. Keep a copy in the tenant file.
4. Annual anniversary (each year): Pay or credit to rent the annual interest (5% or actual rate earned, whichever is greater). Document the payment and method (direct payment vs. rent credit). Set a recurring calendar reminder.
5. At any bank change: Within 30 days of moving the deposit to a different bank, notify the tenant in writing with the new bank name, address, and account number. Send by certified mail.
6. At move-out inspection: Conduct a joint move-out inspection with the tenant if possible. Document all unit conditions with dated photographs and a written checklist. Obtain the tenant's forwarding address in writing — use a form that requires a signature confirming the address provided. Note the date the forwarding address was received; this starts the 30-day clock.
7. Within 30 days of receiving forwarding address: Gather all documentation for any deductions: contractor invoices, estimates, unpaid rent calculations. Prepare and send (via certified mail) the security deposit return (deposit + accrued interest, minus any authorized deductions) together with an itemized written statement listing each deduction with supporting documentation.
8. Document deductions rigorously: Include only: unpaid rent, unpaid utilities expressly permitted in lease, and documented repair costs beyond normal wear and tear. Attach copies of receipts, invoices, or written estimates. Note the date each item was incurred.
9. If no deductions: Return the full deposit plus all accrued interest within 30 days of receiving the forwarding address. No itemized statement is required if there are no deductions, but send a letter confirming the return amount and confirming the interest calculation.
10. Maintain records: Keep the security deposit bank statements, the written receipt, annual interest payment records, and the move-out inspection checklist and photographs for at least 3 years after the tenancy ends. If a §15B dispute reaches Housing Court, these records are the landlord's entire defense.

19. FAQ: Massachusetts Landlord-Tenant Law 2026