Massachusetts Security Deposit Law: A Landlord’s Guide

Massachusetts has one of the strictest security deposit laws in the country. In short: you can collect at most one month’s rent, you must hold it in a separate Massachusetts bank account, pay the tenant interest each year, give specific receipts and a statement of condition, and return the deposit within 30 days of the tenancy ending. Get any of it wrong and a court can award the tenant up to three times the deposit plus attorney’s fees.

The short answer

Security deposits in Massachusetts are governed by G.L. c. 186, section 15B. The law is unusually technical and unusually punishing, because the deposit stays the tenant’s money the whole time you hold it. The safest posture for a landlord is simple: follow every step exactly, keep the paperwork, and when in doubt, do not collect a deposit at all. Many experienced Massachusetts landlords skip the security deposit entirely rather than risk the penalties. [verify current 15B requirements before relying on this.]

The 5 rules MA landlords must follow

The essentials, at a high level: (1) the deposit cannot exceed one month’s rent; (2) it must be held in a separate, interest-bearing account in a Massachusetts bank, apart from your own funds; (3) you must give the tenant a receipt and, within 10 days of move-in, a signed statement of the unit’s condition; (4) you must pay interest annually; and (5) you must return the deposit, with any interest, within 30 days after the tenancy ends, along with an itemized list of any lawful deductions. Miss the mechanics and the money can stop being yours to keep.

The separate escrow account requirement

You cannot mix a security deposit with your own money or your operating account. It has to sit in a separate account in a Massachusetts bank, and you must tell the tenant the bank’s name, the account location, and the amount. If you sell the property or the money is commingled, the tenant may have an immediate claim to it. This is one of the most commonly missed rules and one of the easiest to prove in court.

Interest on deposits

The tenant is entitled to interest on the deposit, paid annually. In general the rate is 5% or whatever lower rate the bank actually paid. Each year you either pay the interest or credit it toward rent, and you give the tenant a statement. Skipping interest is a frequent, avoidable violation. [verify the current interest rule and rate.]

The 30-day return deadline

When the tenancy ends, the clock starts. Within 30 days you must return the deposit plus interest, minus only lawful deductions (unpaid rent, or damage beyond normal wear and tear, documented with an itemized statement and, where required, supporting evidence). “Normal wear and tear” is not damage. Vague or padded deductions are how landlords lose these cases.

Penalties (treble damages)

Here is why every step matters. For certain violations, Massachusetts law allows the tenant to recover three times the deposit, plus interest, court costs, and reasonable attorney’s fees. A paperwork slip on someone else’s money can turn a one-month deposit into a multi-thousand-dollar judgment against you. The penalty is the entire reason to treat 15B as non-negotiable. [verify which violations trigger treble damages.]

How to stay compliant

Three practical moves. First, decide whether a deposit is worth the risk at all, many MA landlords use last month’s rent (which has its own, separate rules) instead. Second, if you do take a deposit, build a checklist for the account, receipts, statement of condition, annual interest, and the 30-day return, and never skip a step. Third, get help. This is exactly the kind of compliance a professional manager handles daily so you are not the one exposed. See how Green Ocean manages rentals.

Frequently asked questions

How much can a MA landlord charge for a security deposit?

No more than one month’s rent. Charging more than that is itself a violation.

Do I have to pay interest on a security deposit in MA?

Yes. Interest is owed annually, generally at 5% or the lower rate the bank actually paid, and you must give the tenant a statement. [verify]

What happens if I don’t return it in 30 days?

You risk losing the right to keep any of it, and certain violations expose you to treble damages plus interest, costs, and attorney’s fees. Return it, with an itemized statement, inside 30 days.

Can I use the deposit for last month’s rent?

No. A security deposit and last month’s rent are legally separate. You cannot unilaterally apply a security deposit to last month’s rent. Treat them as two different things with two different rule sets.

Do not want to gamble on 15B? Green Ocean manages Boston-area rentals with full deposit compliance built in, and charges landlords no fee until the unit is rented. See our flat-fee pricing or request a proposal. Call 617-487-4868. This guide is general information, not legal advice.