Massachusetts has the strictest security deposit statute in the country, and most landlords violate it without knowing. G.L. c. 186, § 15B controls every dollar a landlord can collect at move-in, where the deposit must sit during the tenancy, how much interest it earns, and exactly what happens when the tenancy ends. Certain violations forfeit the deposit entirely and expose the landlord to triple damages plus the tenant’s attorney fees. This guide walks through the Massachusetts security deposit law tenants and landlords actually live under, section by section, with the statute’s own language as the anchor.
The Rules in 60 Seconds
- One month max. A security deposit cannot exceed one month’s rent.
- Escrow required. The deposit must sit in a separate, interest-bearing account at a Massachusetts bank, out of reach of the landlord’s creditors.
- Interest every year. 5 percent annually, or the actual bank rate if lower, paid or credited each year the tenancy runs a year or more.
- 30 days to return. After the tenancy ends, the landlord has 30 days to return the deposit with interest, minus only lawful deductions backed by a sworn itemized list.
- Triple damages. Failing to escrow the deposit, failing to transfer it on sale of the building, or failing to return it within 30 days entitles the tenant to three times the deposit plus 5 percent interest, court costs, and attorney fees under § 15B(7).
Move-In: What a Landlord Can Charge, and the Paper Trail the Law Demands
Only four charges are legal
Section 15B(1)(b) permits a landlord to require exactly four payments at or before the start of a tenancy:
- First month’s rent
- Last month’s rent, calculated at the same rate as the first month
- A security deposit equal to no more than the first month’s rent
- The purchase and installation cost of a new key and lock
That list is exclusive. Application fees, pet deposits, “move-in fees,” “administrative fees,” and holding deposits charged by the landlord are not on it and are not allowed. If you were charged a tenant screening or application fee, the rules covered in our guide to Massachusetts tenant background checks are worth reading alongside this one.
Two receipts, on two clocks
The statute requires two separate receipts for a security deposit. The first is due when the money changes hands: it must state the amount, the date received, and a description of the premises, and it must be signed by the person receiving the deposit (naming the landlord if an agent takes it).
The second receipt is due within 30 days after the deposit is received, and this is the one landlords miss. It must identify the name and location of the bank holding the deposit, plus the amount and the account number. If the landlord never sends this bank receipt, the statute entitles the tenant to immediate return of the deposit on demand.
The statement of condition
A landlord who takes a security deposit must give the tenant a signed, written statement of the apartment’s condition either at the time the deposit is taken or within 10 days after the tenancy begins, whichever is later. It must list any damage that already exists, and it must carry the statutory notice telling the tenant to inspect and respond. The tenant then has 15 days to sign it, add a list of any damage the landlord left off, and return it. Skipping this step wrecks the landlord’s ability to prove later that the tenant caused any damage.
During the Tenancy: Escrow and Annual Interest
Under § 15B(3)(a), the deposit is not the landlord’s money to use. It must be held in a separate, interest-bearing account in a bank located in Massachusetts, protected from the landlord’s creditors. Commingling the deposit with personal or business funds, or holding it in an out-of-state account, is a straight violation, and it is one of the violations that carries treble damages.
Massachusetts security deposit law interest rules are specific. A deposit held for one year or longer earns interest at 5 percent per year, or the actual rate the bank paid if that is less. The landlord must pay or credit the interest to the tenant at the end of each year of the tenancy, along with a statement showing the bank, account number, and interest owed. If the landlord fails to pay within 30 days after a tenancy anniversary, the tenant may deduct the interest from the next rent payment. When the tenancy ends, any accrued interest is due within 30 days.
If the building sells, § 15B(5) requires the old owner to transfer the deposit to the new owner, who steps into all of the same obligations. Failure to transfer is another treble-damages violation.
Move-Out and the Massachusetts Security Deposit Law 30-Day Clock
Section 15B(4) starts a hard clock: the landlord must return the security deposit, with any interest owed, within 30 days after the end of the tenancy. Not 30 business days, and not “after the unit re-rents.” Thirty days from termination.
For a massachusetts security deposit return with deductions, the landlord must deliver, within that same 30 days, an itemized list of damages sworn to under the pains and penalties of perjury, accompanied by written evidence of the repair cost such as estimates, bills, invoices, or receipts. A text message saying “kept it for cleaning” does not satisfy the statute.
What a Landlord Can and Cannot Deduct
Only three categories of deductions are lawful:
- Unpaid rent (and unpaid water charges validly billed to the tenant) that was not lawfully withheld.
- An unpaid, agreed real estate tax increase, but only if the lease contains a valid tax escalation clause obligating the tenant to pay it.
- A reasonable amount to repair damage caused by the tenant or anyone under the tenant’s control, with reasonable wear and tear excluded, and only for damage documented by the sworn itemized statement and cost evidence described above.
So if you are asking “can a landlord keep my security deposit for cleaning, repainting, or carpet wear,” the usual answer is no. Ordinary cleaning, nail holes, faded paint, and worn carpet in traffic paths are classic reasonable wear and tear. A hole punched in a door, a broken window, or pet urine damage is a different story, but even then the landlord must produce the sworn itemization and receipts or estimates within 30 days or lose the right to deduct anything at all.
The Treble-Damages Violations, Precisely
Section 15B(6) lists five ways a landlord forfeits the right to keep any part of the deposit:
- (a) Failing to deposit the funds in a compliant escrow account
- (b) Failing to furnish the itemized damage list within 30 days of termination
- (c) Using a lease that conflicts with § 15B or tries to make the tenant waive rights
- (d) Failing to transfer the deposit to a new owner of the property
- (e) Failing to return the deposit or its lawful balance, with interest, within 30 days
Section 15B(7) then awards triple damages, but only for three of the five: violations of clauses (a), (d), or (e). The award is three times the deposit or balance owed, plus 5 percent interest from the date payment became due, plus court costs and reasonable attorney fees. The attorney-fee provision matters as much as the trebling, because it makes even a $1,500 deposit case worth a lawyer’s time.
Two appellate decisions sharpen the edges. In Taylor v. Beaudry, 75 Mass. App. Ct. 411 (2009), the Appeals Court held that a landlord who returns the deposit late, even voluntarily and before any lawsuit is filed, does not escape treble damages; missing the 30-day deadline under § 15B(6)(e) is itself the violation. On the other side, in Phillips v. Equity Residential Management, LLC, 478 Mass. 251 (2017), the Supreme Judicial Court answered a certified question from the First Circuit and held that a defective itemized statement, a clause (b) violation, forfeits the deposit but does not by itself trigger treble damages under § 15B(7). The practical takeaway: a landlord whose paperwork is bad owes the deposit back single, but a landlord who never escrowed the money or simply keeps it past 30 days owes it back triple.
Last Month’s Rent Is Different
Prepaid last month’s rent is not a security deposit. It does not have to be escrowed, and the landlord cannot use it for damage; it is rent, applied to the final month. But it is not interest-free money either. Under § 15B(2)(a), last month’s rent earns the same 5 percent (or actual bank rate) annually, the landlord must give a receipt stating the amount, date, and that interest is owed, and interest must be paid or credited each year. If the landlord fails to pay the interest within 30 days after the year ends, the tenant can deduct it from rent, and the statute exposes the landlord to treble damages on unpaid last-month’s-rent interest. When the tenancy terminates, accrued interest is due within 30 days.
Step by Step: When Your Deposit Does Not Come Back
- Document at move-out. Photograph or video every room, inside cabinets and appliances, on your last day. Return the keys in a way you can prove, and give your forwarding address in writing.
- Count 30 days. The clock runs from the end of the tenancy. Note whether you received a sworn, itemized list with receipts or estimates within that window.
- Send a written demand. A short certified-mail letter works: state the deposit amount, the move-out date, that § 15B(4) required return within 30 days, and that you will seek treble damages, interest, costs, and attorney fees under § 15B(7) if payment does not arrive within 10 to 14 days. Demands like this settle a large share of these cases.
- Consider a Chapter 93A letter. Security deposit violations by landlords in the business of renting are also unfair practices under the consumer protection statute (940 CMR 3.17(4) says so expressly), and a 93A demand letter opens a second path to multiple damages and fees.
- Sue if needed. Small claims court handles these cases up to its jurisdictional limit, with no lawyer required; District Court and Housing Court hear them as well, and a security deposit counterclaim is a standard response to an eviction. Before filing, it can help to see whether your landlord has been sued before; our guide to looking up a Massachusetts court case shows how to search by name for free.
Landlord Compliance Checklist
- Charge only the four permitted amounts; deposit capped at one month’s rent
- Signed receipt at the moment the deposit is paid
- Separate interest-bearing Massachusetts bank account; bank-detail receipt with account number to the tenant within 30 days
- Statement of condition delivered within 10 days of the tenancy starting
- Interest paid or credited every year, with the annual statement
- On sale, transfer the deposit and notify the tenant
- At move-out: return deposit plus interest within 30 days, or send a sworn itemized list with repair documentation inside the same window
- Never deduct for ordinary wear and tear, and keep every lease clause consistent with § 15B
Many smaller Massachusetts landlords have concluded the statute is unforgiving enough that the safer business decision is to collect first and last month’s rent and skip the security deposit entirely.
Frequently Asked Questions
What is the security deposit law in Massachusetts?
Massachusetts law (G.L. c. 186, § 15B) limits a security deposit to one month’s rent, requires it to be held in a separate, interest-bearing Massachusetts bank account, mandates annual interest payments at 5 percent (or the bank rate if lower), and requires the landlord to return it within 30 days of move-out with any lawful deductions backed by a sworn itemized statement. Violations can result in forfeiture of the deposit and expose landlords to triple damages, interest, court costs, and attorney fees.
How long does a landlord have to return a deposit in Massachusetts?
Thirty days from the end of the tenancy, with accrued interest. Any deductions must arrive within the same 30 days as a sworn, itemized list with receipts, bills, invoices, or estimates. Missing the deadline forfeits the deposit and exposes the landlord to treble damages and attorney fees, even if the deposit is later returned voluntarily.
What happens if my deposit was never in an escrow account?
Failure to hold the deposit in a separate, interest-bearing Massachusetts bank account violates § 15B(3)(a), forfeits the landlord’s right to keep any of the deposit under § 15B(6)(a), and is one of the three violations that triggers treble damages, interest, costs, and attorney fees under § 15B(7). If you never received the bank receipt with the account number, you can demand immediate return of the deposit during the tenancy.
Can my landlord charge a cleaning fee?
Not as a move-in charge; the statute allows only first month, last month, a security deposit, and a key-and-lock cost. At move-out, routine cleaning falls under reasonable wear and tear and cannot be deducted. A deduction is defensible only for genuine damage or conditions beyond normal use, documented in the sworn itemized statement with cost evidence.
How much interest am I owed on my security deposit?
Five percent per year, or the actual rate the bank paid if lower, on both the security deposit and prepaid last month’s rent, for any deposit held a year or more. Interest is due each year of the tenancy and within 30 days of move-out. If a yearly payment is more than 30 days late, you may deduct it from your next rent.
Does a bad itemized damage list mean automatic triple damages?
No. Under Phillips v. Equity Residential Management (SJC 2017), a defective or missing itemized statement forfeits the deposit, so the landlord must return all of it, but that violation alone does not carry treble damages. Trebling attaches to the escrow, transfer-on-sale, and 30-day-return violations.
Can I sue in small claims court, and can I add a 93A claim?
Yes. Small claims sessions in District Court and Housing Court hear security deposit cases routinely, and treble damages are available there. Because the Attorney General’s regulations make deposit violations an unfair practice, a Chapter 93A demand letter adds its own multiple-damages and fee exposure for landlords in the rental business.
This article describes G.L. c. 186, § 15B for general informational purposes and is not legal advice. Statutes and case law change; check the current text on malegislature.gov or consult a Massachusetts attorney about your situation.