Massachusetts Security Deposit Law: 30-Day Return and Triple Damages

In Massachusetts, a landlord must return your security deposit within 30 days after your tenancy ends, either in full with any interest owed, or accompanied by a signed, itemized list of damages backed by written cost estimates or receipts. The 30-day rule comes from M.G.L. c. 186, § 15B, and it is unforgiving: missing the deadline, skipping a required document, or mishandling the money at any earlier point in the tenancy forfeits the landlord’s right to keep any portion of the deposit and can expose them to triple damages plus your attorney’s fees.¹

When the 30-Day Clock Starts

The trigger date depends on your tenancy type. If you had a written lease, the 30 days run from the termination date in the lease. If you were a tenant-at-will (month-to-month), they run from the day your occupancy actually ended.¹

So if your lease ran through August 31 and you moved out a week early, the clock still starts September 1. If you were month-to-month and handed back the keys on July 15, July 15 is day zero. There is no extension for holidays, for difficulty reaching you, or for complicated repair estimates. Day 31 is late.

What Should Arrive Within 30 Days

If the landlord isn’t claiming any damage, you should receive the full deposit plus any accrued interest. That’s it. The same 30-day deadline governs this straightforward return.

If the landlord is withholding money for repairs, the envelope must contain three things along with whatever balance of the deposit remains:

An itemized list of the specific damage. Not “general apartment damage” or “cleaning and repairs,” but discrete items described with enough detail to identify them, such as three two-inch holes in the bedroom drywall.
A sworn statement signed by the landlord or their agent under the pains and penalties of perjury, attesting that the damages and costs are real and accurate.
Written proof of the cost of each repair: estimates, bills, invoices, or receipts.

All three are mandatory.² A vague list, a missing signature, or no cost documentation puts the landlord in the same position as sending nothing at all.

Interest You’re Owed With the Return

If your tenancy lasted a year or more, the landlord owes you interest on the deposit at 5% per year or the actual (lower) rate the bank paid, whichever applies. Interest accrues from the first day of the tenancy and is supposed to be paid to you at the end of each lease year. Any interest that wasn’t paid out during the tenancy must be included with the deposit when it’s returned within the 30-day window.¹

Earlier Missteps That Entitle You to the Full Deposit

The 30-day rule gets most of the attention, but several landlord obligations attach much earlier in the tenancy. Breaking any of them has the same consequence as missing the return deadline: the landlord loses the right to keep any part of your deposit, and can’t even counterclaim for damage if you sue to get it back.¹

Statement of Condition at Move-In

Within 10 days after your tenancy began, or whenever the landlord received your deposit if later, you should have been given a written statement describing the current condition of the unit, listing existing scuffs, stains, cracks, and other flaws. You then had 15 days to add anything the landlord missed. A landlord who skipped this step entirely cannot deduct from your deposit at move-out, no matter what shape the apartment is in.¹

Separate Account and Receipt

Your deposit was supposed to go into a separate, interest-bearing account at a Massachusetts bank, held in a way that keeps it out of reach of the landlord’s creditors.³ Within 30 days of receiving it, the landlord was supposed to give you a receipt listing the bank’s name and location, the account number, and the amount deposited.¹ If the money was never deposited properly, or you never got that receipt, you don’t have to wait until move-out to demand the deposit back.

If the landlord collected any charge at move-in beyond the first month’s rent, last month’s rent, a security deposit capped at one month’s rent, and the actual cost of a new lock and key, that too can forfeit the right to keep any of the deposit later.¹

Damage Versus Normal Wear and Tear

Only damage beyond normal wear and tear is deductible. The statute doesn’t define the phrase, but faded paint, minor scuffs on hardwood, and worn carpet in high-traffic areas are the ordinary result of someone living in a home and are not chargeable to you. Punched walls, burns on countertops, broken fixtures, and pet damage to flooring are the kinds of things that cross the line.²

This is where the move-in statement of condition matters. Without it, the landlord has no documented baseline to show that a given problem wasn’t already there when you arrived. If you kept your own copy, dated photos, or a signed statement that noted pre-existing issues, pull it out before responding to any deduction.

What You Can Recover if the Landlord Misses the Deadline

The penalties stack, and they’re designed to be severe.

Forfeiture of All Deductions

A landlord who blows the 30-day deadline, sends an incomplete deduction package, or failed to hold your deposit in a proper separate account loses the right to retain any of the money. That holds even if the apartment was genuinely damaged. On top of that, the landlord cannot bring a counterclaim for property damage if you sue to recover the deposit.¹

Triple Damages Plus Interest

A court can award you three times the amount wrongfully withheld, plus 5% interest from the date the deposit was due back. On a $2,000 deposit, that’s $6,000 in base damages before interest, costs, or fees.¹

Attorney’s Fees and Court Costs

The statute requires the landlord to pay your reasonable attorney’s fees and court costs on top of damages. In many cases the fees alone exceed the original deposit.¹

Pursuing It in Small Claims

Massachusetts district court filing fees for small claims scale with the amount at stake, running from $40 for claims of $500 or less up to $150 for claims between $5,001 and $7,000.⁴ Because triple damages apply to the amount wrongfully withheld, the amount in controversy is often three times the deposit, which affects both the filing fee and whether the claim fits within small claims limits.

If you moved without leaving a forwarding address, the landlord’s obligation doesn’t disappear; they’re expected to send the deposit and documentation to your last known address, which is usually the apartment you just left. A returned, unopened envelope can support a landlord’s claim of good-faith compliance, so if you’ve moved, it’s worth sending written notice of your new address.

Landlord Mistakes That Mean You’re Owed the Full Deposit

Most violations aren’t deliberate; they’re procedural failures. The ones housing courts see most often:

No statement of condition was ever provided at move-in.
The deposit was mixed into the landlord’s regular operating account instead of a separate trust account. That alone forfeits the deposit.
The deduction notice uses vague language such as “apartment needed cleaning and repairs — $800” rather than itemizing each problem and cost.
The itemized list is detailed, but the landlord never signed it under the pains and penalties of perjury. Incomplete paperwork counts as no paperwork.
The envelope was mailed on day 31. One day late is late.

Any one of these entitles you to the entire deposit back, opens the door to triple damages, and shifts your legal costs onto the landlord. The statute treats its requirements as equally mandatory, which is why a landlord who did everything else right can still owe you the full amount.

1
General Court of Massachusetts. Massachusetts General Laws Chapter 186 Section 15B
2
Executive Office of Housing and Livable Communities. Security Deposits and Last Month’s Rent
3
Executive Office of Housing and Livable Communities. Learn About Holding a Security Deposit
4
Mass.gov. Boston Municipal Court and District Court Filing Fees