Boston Security Deposit Rules 2026–27: The Massachusetts Receipts, Interest and 30-Day Deadlines That Decide Whether You Get Your Money Back
Most Boston renters think about their security deposit twice: the day they hand it over and the day it fails to come back. The Massachusetts security deposit law is built around a much longer stretch than that. What your landlord did, or did not do, in the first 30 days of your tenancy can matter more than the condition of the apartment when you leave.
That is unusual. In many states a landlord who keeps a deposit only has to explain the deductions. In Massachusetts, a landlord who skipped a receipt, mixed your deposit with their own money or missed the return deadline can lose the right to keep any of it, and in some cases owes you three times the amount. Because the rules are strict, they reward tenants who keep paperwork.
This guide walks through the law in the order you will actually meet it, from signing a lease in Dorchester or Allston to filing in small claims if the money never arrives.
Last checked October 2026. Sources: Mass.gov consumer pages on security deposits and Massachusetts General Laws chapter 186, section 15B; City of Boston Office of Housing Stability. This is general information, not legal advice.
What a Boston Landlord Can Ask For Before You Move In
Massachusetts limits upfront charges more tightly than most places. Under state law, a landlord may collect:
First month's rent
Last month's rent, paid in advance
A security deposit of no more than one month's rent (it may be lower in some subsidized housing)
The cost of buying and installing a new lock and key
That is the full list. The City of Boston's tenant guide says plainly that it is illegal for a landlord to charge a holding fee or a pet fee, and that only licensed real estate brokers may charge a broker's or finder's fee. If you were charged an illegal fee, the city points tenants to the Massachusetts Attorney General's Office.
One detail catches people later: if your rent goes up, Boston's guide notes that you have to make up the difference in the security deposit and last month's rent, and Mass.gov says a landlord can raise the last month's rent to match the new rent.
The state law does not apply to tenancies of 100 days or less or to vacation rentals, according to Mass.gov.
The Paper Trail Your Landlord Owes You
Here is where Massachusetts differs most. A landlord who takes a security deposit has several written duties, each with its own deadline.
When | What the landlord must give you |
The day you pay | A written receipt showing the amount, who received it, the date, the landlord's and tenant's names, and the property address |
Within 10 days | A signed statement of the apartment's condition, listing known damage and sanitary or building code violations |
Within 30 days | A receipt naming the Massachusetts bank where the deposit is held, its location, the account number and the amount |
Each year of the tenancy | A statement of the bank, account number, deposit amount and interest owed, plus the interest or a notice that you can deduct it from rent |
Within 30 days after the tenancy ends | The deposit or balance, with interest, plus a sworn itemized list and cost evidence for any damage deductions |
The statement of condition: your 15-day window
The condition statement is the document most tenants ignore and later wish they had read. Mass.gov says it must carry specific language at the top telling you to check it. If it is wrong, you attach your own signed list of damage and return it within 15 days after you receive the statement or within 15 days after you move in, whichever is later.
If you do not return it, a court may later treat your silence as agreement that the list was complete. If you do send back a list of additional damage, the landlord has another 15 days to either sign your list or give you a signed statement of disagreement.
Practical advice: take dated photos of every room on move-in day, mark every scuff and stain on your copy of the statement, keep a copy and send it back in a way you can prove.
Where the money has to sit
The deposit must be held in a separate, interest-bearing account in a bank located in Massachusetts, beyond the reach of the landlord's creditors. It cannot be treated as the landlord's own money. Your deposit also cannot be used as last month's rent unless you and the landlord both agree.
Interest: Small Amounts, Real Rights
You are entitled to interest on two kinds of prepayment:
Security deposit: 5% a year, or the lower amount the bank actually paid, once the landlord has held the deposit for at least a year.
Last month's rent: 5% a year, or the lower bank rate if it was deposited. If it was never put in a bank, the landlord owes 5%. You do not need to have lived there a year.
Interest is due each year on the anniversary of your tenancy. If you have not received the interest or the notice within 30 days after the anniversary, Mass.gov says you may deduct the interest from your next rent payment. When the tenancy ends, any interest owed must be paid within 30 days.
The dollar figures are usually modest. Their value is that a landlord who never sent annual statements has often also skipped other steps, which affects what you can recover.
Moving Out: The 30-Day Clock
Your landlord has 30 days after you move out to return the deposit and interest, minus any lawful deductions. If you had a written lease and left early, the clock runs from the end of the lease instead.
The only allowed deductions under state law are:
Unpaid rent or water charges that were not lawfully withheld
An unpaid real estate tax increase, but only under a valid tax escalation clause in your lease
A reasonable amount to repair damage caused by you, your household or your guests, excluding reasonable wear and tear
For damage deductions, the landlord must give you within those 30 days an itemized list, sworn under the pains and penalties of perjury, and written evidence such as estimates, bills, invoices or receipts. The landlord cannot deduct for damage that was already on the move-in condition statement.
Mass.gov is direct about late returns: if the landlord does not return the balance on time, they lose the right to keep any portion of it. There is no required form of payment.
Before you leave, Boston's guide suggests cleaning the unit, photographing its condition, returning every key and forwarding your mail. Give your landlord a forwarding address in writing so there is no question about where to send the check.
When a Landlord Loses the Right to Keep Your Deposit
These consequences are what make the law powerful. According to Mass.gov, you are entitled to the immediate return of the deposit if the landlord:
Does not give you, within 30 days, a receipt with the bank name, location and account number
Does not make deposit records available for inspection during business hours
Does not put the deposit in a separate interest-bearing Massachusetts bank account
Uses a lease that conflicts with the deposit law and tries to enforce it, or asks you to waive your rights
You may be entitled to three times the deposit (or the balance owed after lawful deductions), plus interest, court costs and reasonable attorney's fees, if the landlord:
Fails to hold the deposit in a separate interest-bearing Massachusetts bank account
Fails to transfer the deposit to a new owner when the building is sold
Fails to return the deposit or balance, with interest, within 30 days after the tenancy ends
If the landlord fails to pay interest owed within 30 days after the tenancy ends, you may be entitled to three times the interest, plus costs and fees.
If the building was sold
When ownership changes, the old landlord must transfer the deposit, last month's rent and accrued interest to the new owner, who must notify tenants in writing within 45 days of receiving the money. If the old owner never transfers it, the new owner is still responsible to you. Mass.gov says the new owner can satisfy that by giving you free rent for an equivalent period.
Getting Your Money Back: A Step-by-Step Plan
1. Gather your file. Find the lease, any receipts, the condition statement, annual interest statements, your move-in and move-out photos and proof of the date you moved out.
2. Count the days. Day 1 is the day after you moved out, or the day after a written lease ended if you left early. If day 30 passes with nothing, or with deductions but no sworn itemized list, the landlord has likely lost the right to keep the money.
3. Write a demand letter. Keep it short. State your move-out date, the amount of the deposit and last month's rent, what the law requires (cite Massachusetts General Laws chapter 186, section 15B) and what you are asking for, with a deadline such as 10 days. Mention any missing receipts or late return. Send it by a method you can prove and keep a copy.
4. Ask for help. The City of Boston's Office of Housing Stability has attorneys on staff and works with legal aid groups. It can also arrange mediation between tenants and landlords.
Office of Housing Stability: 617-635-4200, 26 Court Street, Monday through Friday, 9 a.m. to 5 p.m., or housingstability@boston.gov
Greater Boston Legal Services: 617-371-1234 (free civil legal aid for people with low incomes)
Harvard Legal Aid Bureau: 617-495-4408
5. File in court if needed. Mass.gov says you can bring a civil or small claims case if the landlord does not return the deposit after the tenancy ends, or does not follow the deposit law and refuses to return it when asked, even while you still live there. The small claims limit in Massachusetts is $7,000. Bring your file, your letter and a copy of the sworn list (or proof that none arrived).
A landlord who believes damage exceeds the deposit can sue you separately, but Mass.gov says they cannot countersue for damage inside your deposit case. They have to file their own action.
If You Are Still Living There
You do not have to wait until move-out to check. Ask in writing for the bank name and account number if you never got the 30-day receipt. Keep records of rent increases so you know what was added to the deposit. If you are behind on rent or facing a notice to quit, contact the Office of Housing Stability early; its housing crisis case coordinators work with tenants facing eviction.
Common Mistakes That Cost Boston Tenants Money
Not returning the condition statement. It is your best evidence of what was already damaged.
Treating the deposit as last month's rent without agreement. That needs both sides to agree.
Leaving without a forwarding address in writing.
Paying an illegal pet or holding fee and saying nothing. Report it to the Attorney General's Office.
Missing that the clock runs from the lease end date if you moved out early under a written lease.
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