Massachusetts Security Deposit Escrow Account Rules

A Massachusetts security deposit has to sit in a separate, interest-bearing account at a Massachusetts bank — not in your personal checking account, not in your operating account, and not mixed with rent income. The deposit itself is capped at one month's rent, though you may also collect first and last month's rent, and it must be returned within 30 days after the tenancy ends with an itemized list of any deductions. The controlling law is Mass. Gen. Laws ch. 186 § 15B, which also sets the interest terms, the receipts and notices you owe the tenant, and the consequences for getting it wrong.

What "separate" actually means

The money stays the tenant's money. You are holding it, not owning it. In practice that means an account that exists for deposits and nothing else: no rent deposits flowing through it, no mortgage payments drawn from it, no "I'll move it back before anyone notices." The account has to be interest-bearing and at a Massachusetts bank. The statute, not your bank's product menu, governs how interest is handled and when it goes to the tenant, so read § 15B before you set anything up.

One account can hold deposits for several tenants, as long as your records show exactly how much belongs to each tenancy and the interest attributable to each. What you cannot do is treat the balance as a cushion. If a tenant moves out and the balance is short because you borrowed from it, that is a problem you created months earlier.

A worked example: a $1,900 two-bedroom in Worcester

Say you rent a two-bedroom for $1,900 a month on a one-year lease starting July 1. This is a hypothetical, but the arithmetic is the part worth copying.

Step 1 — Decide what you're collecting

You decide to collect first month's rent, last month's rent, and a security deposit. That's $1,900 + $1,900 + $1,900 = $5,700 before the tenant gets keys. The security deposit portion is $1,900 — one month's rent, which is the cap. If you had wanted a "$2,500 deposit because they have a dog," that would blow past the cap; the extra $600 is not collectible as a security deposit. You can sanity-check the ceiling in any state with our security deposit limit checker.

Note the split matters. Last month's rent and a security deposit are different things with different rules under § 15B. Label them separately on the lease and on every receipt so there is no argument later about which bucket a dollar came from.

Step 2 — Open the account before the money arrives

In June, you open a separate interest-bearing account at a Massachusetts bank, in your name as landlord, for deposits only. Opening balance: $0. You note the bank name, branch, and account number, because the statute addresses what the tenant must be told about where the money sits and in what form — check § 15B for the exact requirements and timing rather than guessing.

On June 28 the tenant pays $5,700. You split it the moment it clears: $1,900 of rent to your operating account, $1,900 of last month's rent handled per the statute's rules for that money, and $1,900 of security deposit into the deposit account. The deposit account balance is now $1,900 and your operating account never touched it.

Step 3 — Document the unit's condition

On June 30 you walk the apartment with the tenant and record condition room by room with dated photos — scuffed baseboard in the hallway, working smoke detectors, carpet clean. This is the evidence that lets you justify a deduction later, and § 15B has its own requirements for a statement of condition, so follow those. Our move-in and move-out inspection checklist covers how to structure the walkthrough so the before-and-after comparison holds up.

Step 4 — The tenancy runs

Twelve months pass. Rent comes in monthly to your operating account. The deposit account is untouched except for interest the bank posts. You do not pay for a plumbing repair out of it in March, even though the money is sitting right there. Interest treatment and what you owe the tenant on it is set by the statute.

Step 5 — Move-out and the 30-day clock

The tenancy ends and the tenant returns keys on June 30. Your deadline to return the deposit with an itemized list of deductions is July 30 — 30 days after the tenancy ends. Treat that date as hard and work backward from it.

On July 2 you inspect. The hallway baseboard scuff is the same one you photographed at move-in, so that is pre-existing and not deductible. But the kitchen wall has a hole roughly the size of a doorknob that was not there in your June photos, and the unit needs a repair you pay a contractor $340 for on July 9 — invoice in hand.

So the math on July 12:

• Deposit held: $1,900
• Wall repair, invoiced: −$340
• Balance returned: $1,560, plus interest as the statute requires

You write an itemized list naming the deduction, the amount, and the invoice, attach a copy of the contractor bill, and mail it with the check so it goes out well before July 30. The $340 comes out of the escrow account along with the $1,560 — the account closes out at zero for that tenancy, and your records show the trail. What counts as a legitimate deduction, and what documentation has to accompany it, is governed by § 15B; see our Massachusetts security deposit rules for the breakdown.

How this changes if you only collect last month's rent

Change one fact: you skip the security deposit entirely and collect only first and last month's rent — $3,800 up front instead of $5,700. Now there is no security deposit, so there is no security deposit escrow account to open and no itemized deduction list at move-out, because there is nothing to deduct from. That $340 wall repair becomes a claim you have to pursue against the former tenant directly rather than a number you subtract from money you already hold.

That is the real trade-off. Holding a deposit gives you a funded remedy for damage, but it also puts you under the full set of § 15B obligations — the separate Massachusetts bank account, the interest, the notices, the 30-day return with itemization. Some small landlords decide the paperwork risk outweighs the cushion and collect last month's rent only. Last month's rent still has its own statutory treatment, so skipping the deposit does not mean skipping the statute.

Setting it up so you don't slip

Three habits prevent most deposit problems. First, open the deposit account before you advertise the unit, so there is never a window where tenant money lands somewhere else. Second, write the deposit terms into the lease rather than a side agreement — a Massachusetts lease agreement should spell out the amount, the account, and the move-out process. Third, keep a per-tenancy ledger: deposit received, date, interest posted, deductions with invoices, amount returned. Rentmark tracks rent and expenses per lease and stores inspection photos, which makes reconstructing that ledger at move-out a lot less painful than digging through a shoebox.

The one number you should have written on your calendar the day keys come back is the return deadline. Everything else — inspection, estimates, invoices, the itemized letter — gets scheduled to land before it.

This is general information, not legal advice. Read Mass. Gen. Laws ch. 186 § 15B in full, and talk to a Massachusetts attorney about your specific situation.