Massachusetts Security Deposit Laws: Limits, Deductions, and Returns

Massachusetts security deposit law lives almost entirely in one statute, General Laws Chapter 186, Section 15B, and it is unusually strict: a landlord who slips on any requirement can forfeit the deposit and owe you triple that amount, whether or not they meant any harm.¹ The rules cover what a landlord can charge at move-in, how the money must be held, what they can deduct, and how quickly they must return the balance. Miss any of those, and the tenant has real leverage.

What a Landlord Can Charge at Move-In

At or before the start of a tenancy, a Massachusetts landlord may collect only four things: first month’s rent, last month’s rent (at the same rate as the first month), a security deposit no larger than one month’s rent, and the cost of purchasing and installing a new lock and key.¹ Nothing else is permitted. Application fees, move-in fees, “administrative charges,” and similar add-ons written into a lease are illegal regardless of what the lease calls them.

The one-month cap on the deposit is absolute. If your rent is $2,400 a month, $2,400 is the ceiling. Anything above that already violates the statute the moment it’s collected.

How Your Deposit Must Be Held

Your deposit does not belong to the landlord while you rent. It must go into a separate, interest-bearing account at a Massachusetts bank, kept apart from the landlord’s personal or business funds.¹ When the landlord takes the deposit, they must give you a written receipt showing the amount, the date, and a description of the unit, and they must tell you in writing which bank holds the money and the account number.

You are entitled to interest from the first day of the tenancy at 5% per year or the actual rate the bank pays, whichever is lower.² The landlord pays that interest each year on the anniversary of your tenancy. If you leave before the anniversary, you get all accrued interest within 30 days of move-out. The same interest rule applies to last month’s rent if the landlord collected it up front. Modest as the dollars may be at current bank rates, failing to pay interest is a separate violation with its own consequences.

The Statement of Condition

Within ten days of receiving your security deposit, the landlord must give you a written statement describing the condition of the unit and noting any existing damage.¹ This document is the baseline for every deduction argument at move-out, so treat it that way.

You then have 15 days to review it, add anything the landlord missed or described inaccurately, sign it, and return it. If a stained countertop is listed as “good condition,” correct it. If the walls had scuffs when you arrived, write them down. Photograph the whole unit while you’re at it. A landlord who never issues the statement in the first place has weakened their own position: courts view its absence unfavorably when the landlord later claims the tenant caused damage.

What a Landlord Can Deduct at Move-Out

At move-out, deductions are limited to three categories: unpaid rent (including water charges where applicable), real estate tax increases the lease specifically passes through to the tenant, and the cost of repairing damage the tenant caused beyond normal wear and tear.¹³ That’s the entire list. A landlord cannot deduct for professional cleaning because the place wasn’t left spotless, and cannot deduct for repainting walls that have simply faded after years of use.

Wear and Tear vs. Damage

Most disputes turn on this line. Minor scuffs on walls, small nail holes from hanging pictures, worn carpet in high-traffic areas, and faded paint after several years are normal wear and tear, and the landlord cannot charge for them. Holes punched in drywall, pet stains soaked into carpet padding, a broken window, or cigarette burns on countertops are damage, and deductions for those are fair.

Depreciation matters more than most tenants realize. If the carpet was six years old when you stained it, the landlord generally cannot bill you for brand-new carpet. HUD’s standard guidelines put the useful life of rental carpet at roughly six years, so a carpet at or past that age had essentially no remaining value.⁴ A legitimate deduction reflects only the remaining useful life of the item, not the sticker price of a replacement.

Pet Deposits Are Not Allowed

Because the total deposit is capped at one month’s rent, there is no room for a separate pet deposit on top of it. Massachusetts housing courts have also treated recurring “pet fees” designed to protect against pet damage as illegal additional security deposits, regardless of what the lease calls them.

Assistance animals are a separate matter. Under the federal Fair Housing Act, an assistance animal is not a pet, and a housing provider must waive pet-related deposits, fees, and rules as a reasonable accommodation for a tenant with a disability.⁵ No extra charge is permitted.

The 30-Day Return Rule

Once you move out, the landlord has 30 days to return the deposit plus accrued interest, or provide a written, itemized list of deductions explaining why any portion is being kept.¹ The itemized list needs actual receipts or written estimates for each repair. A single line reading “cleaning and repairs — $800” does not satisfy the statute. Each item needs a specific dollar amount with documentation behind it.

If a partial refund is due, both the remaining balance and the itemized list must arrive within the 30-day window. The clock runs from the end of occupancy, typically the day you return the keys or the lease termination date. Missing the deadline by even one day opens the door to the penalty provisions.

Penalties When Landlords Break the Rules

This is where Section 15B has real teeth. Certain violations cause the landlord to forfeit the entire deposit, meaning they lose the right to keep any of it for any reason, even if you genuinely caused damage.² Forfeiture triggers include:

Failing to place the deposit in a separate, interest-bearing Massachusetts bank account.
Not providing an itemized list of deductions within 30 days of move-out.
Not returning the deposit or balance within 30 days.
Including a lease provision that conflicts with Section 15B and attempting to enforce it.
Not transferring the deposit to a new owner when the property is sold.

For three of these, improper holding, failed transfer on sale, and late return, the penalty escalates to treble damages: three times the deposit amount, plus 5% interest from the date the money was due, plus court costs and reasonable attorney’s fees.¹ On a $2,400 deposit, treble damages alone come to $7,200 before interest and fees.

Bad faith is not required. The Legislature removed the “willful violation” language in 1972, and courts have applied treble damages on a strict liability basis ever since. A landlord who simply forgot to open a separate bank account, or who returned the deposit on day 35 instead of day 30, faces the same penalty as one who deliberately pocketed the money.

Enforcing Your Rights in Small Claims Court

Massachusetts small claims court handles disputes up to $7,000, which covers most deposit cases, including treble-damages claims on deposits up to roughly $2,300.⁶ Filing fees scale with the amount claimed:

$500 or less: $40
$501 to $2,000: $50
$2,001 to $5,000: $100
$5,001 to $7,000: $150

No lawyer is required, and most tenants handle these cases themselves. A formal demand letter isn’t required either, but sending one is still a good idea. It gives the landlord a chance to resolve things without court and documents your effort to communicate.

Building the Case

Bring the lease, the statement of condition (if you got one), your own move-in and move-out photos, any written communications about the deposit, the deposit receipt, and records of interest payments received or not received. If the landlord sent an itemized deduction list, bring it. If they never sent one, that absence is itself evidence.

Photographs decide most of these cases. Timestamped move-in shots next to move-out shots settle the wear-and-tear question quickly. Statements from anyone who saw the unit at either end of the tenancy help too.

The Hearing

After you file, the court often offers mediation before scheduling a hearing.⁶ Any agreement reached gets filed as an enforceable judgment. If mediation fails, the case goes to a clerk-magistrate or judge. The burden of proof is on you as the person who filed.

If you win, the court can award the deposit or balance owed, treble damages where the statute requires them, 5% interest from the date payment was due, court costs, and reasonable attorney’s fees.¹ The statutory damages still apply even if you represented yourself and had no attorney’s fees to recover.

The New Fee-in-Lieu Option

A 2025 amendment to Section 15B, effective August 1, 2025, authorizes the state’s Executive Office of Housing and Livable Communities to write regulations allowing landlords and tenants to agree on a fee instead of a traditional security deposit, aimed at lowering the upfront cost of renting.² The statute sets the guardrails. The total fee, however it is paid, cannot exceed one month’s rent over the whole lease. It can be partially or fully non-refundable, but only if the lease clearly discloses that and the tenant acknowledges it in writing. The option must be voluntary on both sides, and any landlord offering it must offer it to every approved applicant without discrimination.

If you start with the fee and later prefer a standard deposit, you can switch by paying the deposit amount minus fees already paid, so the combined total stays within one month’s rent. Whether implementing regulations have been finalized depends on the Executive Office’s rulemaking timeline; check with the office or a local tenant advocacy group before relying on this option.

A Note for Servicemembers

If you terminate a lease under the federal Servicemembers Civil Relief Act, the standard deposit rules still apply on the same 30-day timeline, and the landlord cannot use fees or withheld deposits as a de facto early termination penalty. The Department of Justice has taken the position that requiring servicemembers to repay rent concessions or discounts upon early termination is itself an illegal early termination fee under the SCRA.⁷

1
General Court of Massachusetts. Massachusetts General Laws Chapter 186 Section 15B
2
General Court of Massachusetts. Massachusetts General Laws Part II Title I Chapter 186 Section 15B
3
Mass.gov. Find Out What Landlords Can Use Security Deposits For
4
U.S. Department of Housing and Urban Development. CNA e-Tool Estimated Useful Life Table
5
U.S. Department of Housing and Urban Development. Assistance Animals
6
Mass.gov. Small Claims Court
7
U.S. Department of Justice. Servicemembers and Veterans Initiative – Financial and Housing Rights