Massachusetts Security Deposit Laws: The One-Month Cap, 5% Interest, 30-Day Return, and Triple Damages
Deposit Cap · Separate Account · 5% Interest · Statement of Condition · 30-Day Return · Sworn Itemization · Triple Damages
Massachusetts has one of the strictest and most technical security deposit statutes in the country, and it is set almost entirely by one law — General Laws Chapter 186, Section 15B. Unlike most states, Massachusetts does not just cap the deposit and set a return deadline; it dictates exactly where the money must be held, what receipts and statements the landlord must hand over and when, how interest is calculated and paid, and — critically — which specific violations expose a landlord to triple damages plus attorney’s fees. Get one of those steps wrong and the deposit can turn into a liability many times its size. This guide walks the whole Massachusetts framework end to end so you know each requirement and its deadline.
The details matter here more than almost anywhere. A Massachusetts landlord who holds the deposit in the wrong kind of account, skips the receipt or the statement of condition, or misses the thirty-day return window is not merely being sloppy — each of those is a distinct statutory failure, and some of them trigger a court award of three times the deposit. Because the stakes are so high, this guide flags exactly which mistakes forfeit the deposit and which ones trigger the triple-damages penalty, so you can tell a costly error from a catastrophic one. Everything here is general information, not legal advice; confirm the current figures and consult a licensed Massachusetts attorney before acting on a specific dispute.
Below, a short overview video summarizes the Massachusetts deposit rules; the sections that follow break down each piece in detail — the one-month cap and the four things a landlord may lawfully collect at signing, the separate interest-bearing account and receipt, the five-percent interest rule, the statement of condition, allowable deductions versus wear and tear, the thirty-day return deadline, the sworn itemized list, the triple-damages penalty, and the small-claims path if a dispute cannot be resolved.
Massachusetts Security Deposit Rules at a Glance
Primary Statute
General Laws Chapter 186, Section 15B
Deposit Cap
One month’s rent
Return Deadline
30 days after tenancy ends or move-out
Triple-Damages Penalty
3x deposit + 5% interest + costs + fees
The One-Month Cap and the Four Things a Landlord May Collect
Massachusetts caps the security deposit at one month’s rent. That is the ceiling for the deposit itself, and it does not change for a furnished unit. What trips landlords up is not the cap but the tight list of what may be collected around it. Under General Laws Chapter 186, Section 15B, at or before the start of a tenancy a Massachusetts landlord may lawfully require only four payments, and nothing else:
- The first month’s rent.
- The last month’s rent, paid in advance. This is a separate sum from the deposit and has its own interest rule.
- A security deposit of no more than one month’s rent.
- The actual cost of a new lock and key, if the landlord installs a new lock for the tenant.
Anything outside that list is not allowed at move-in. A non-refundable pet fee, a cleaning fee, an amenity or “move-in” fee, an application-processing surcharge charged as a condition of the tenancy — none of these is a permitted up-front charge under Section 15B. This is one of the most common and most expensive errors Massachusetts landlords make, because the statute treats the list as exclusive rather than illustrative.
No Non-Refundable Fees, No Extra Move-In Charges
Massachusetts does not allow a landlord to dress up an extra charge as “non-refundable.” If a landlord collects a pet deposit, a cleaning deposit, or any similar sum as a deposit, it is part of the refundable security deposit and counts against the one-month cap — it cannot be kept automatically. The only lawful move-in charges are first month’s rent, last month’s rent, a one-month deposit, and the real cost of a new lock. Charging more can itself be a violation, so verify the current rule before you set your move-in figure.
The Deposit and Last Month’s Rent Are Two Different Things
Massachusetts is unusual in expressly authorizing a landlord to collect last month’s rent in advance in addition to a security deposit. Keep them separate in your records and in the tenant’s mind. The last month’s rent is prepaid rent that covers the final month of the tenancy. The security deposit is held against unpaid rent and damage and is returned after move-out. Both must be handled under Section 15B, but they follow different rules — and both earn interest, as the next sections explain.
Takeaway
A Massachusetts deposit is capped at one month’s rent. At signing a landlord may collect only four things — first month, last month, a one-month deposit, and the cost of a new lock. Every other up-front fee, including any “non-refundable” charge, is not allowed. Verify the current cap before you set a deposit amount.
The Separate Interest-Bearing Account and the Receipt
Where the deposit is held is not optional bookkeeping in Massachusetts — it is a statutory command with teeth. Under General Laws Chapter 186, Section 15B, a landlord who takes a security deposit must place it in a separate, interest-bearing account in a bank located in Massachusetts, on terms that put the money beyond the reach of the landlord’s creditors. The deposit is not the landlord’s money; it remains the property of the tenant, and it may not be commingled with the landlord’s own funds or the building’s operating account.
The landlord must then document the account to the tenant. Within thirty days after receiving the deposit, the landlord must give the tenant a receipt that states the name and location of the bank holding the deposit and the account number. This receipt is not a formality — it lets the tenant confirm the money is being held lawfully, and its absence is evidence that the account requirement was ignored.
Failing to Hold the Deposit Correctly Is a Triple-Damages Violation
Of all the Section 15B rules, the separate-account requirement is one of only three whose breach can trigger triple damages. If a landlord fails to hold the deposit in the required separate interest-bearing Massachusetts account beyond the reach of creditors, a court can award the tenant three times the deposit plus five-percent interest, court costs, and reasonable attorney’s fees. Commingling the deposit with operating funds is exactly the kind of error that produces a catastrophic result, so open the correct account before you accept the first deposit.
Takeaway
Hold every Massachusetts deposit in a separate, interest-bearing account in a Massachusetts bank, beyond the reach of your creditors, and give the tenant a receipt with the bank name, location, and account number within thirty days. Getting the account wrong is one of the three triple-damages failures — never commingle a deposit with operating money.
Interest on the Deposit — the 5% Rule
Massachusetts is one of the states that requires a landlord to pay the tenant interest on the deposit, and it sets the rate by statute. Under General Laws Chapter 186, Section 15B, the deposit earns interest at 5% per year, or the lesser amount actually paid by the bank where the deposit is held. In practice, because most bank accounts pay far less than 5%, the “or the lesser bank rate” language matters: the landlord owes the tenant the interest the account genuinely earned, and only up to 5%.
The interest is not paid once at the end. It must be paid or credited to the tenant each year the deposit is held, and again within thirty days after the tenancy ends. Interest begins to accrue when the deposit is received and runs while the landlord holds it.
The Tenant’s Right to Deduct Unpaid Interest
The statute gives the tenant a self-help remedy if a landlord ignores the annual interest. If the landlord has held the deposit for a full year and fails to pay the interest due within thirty days after the anniversary, the tenant may deduct that interest from the next rent payment. This is one of the few places Massachusetts law lets a tenant lawfully reduce rent, and it exists precisely to make the annual-interest duty enforceable without a lawsuit.
Last Month’s Rent Earns Interest Too
The same statute requires interest at 5% per year on last month’s rent collected in advance, payable each year and at the end of the tenancy. A separate rule addresses the specific situation of unpaid last-month-rent interest. Because these interest duties run in parallel with the deposit rules and the exact mechanics can be technical, confirm the current requirements before you calculate what you owe a departing tenant.
Takeaway
A Massachusetts deposit earns interest at 5% per year, or the lesser rate the bank actually paid, credited to the tenant every year and again within thirty days of move-out. Skip a year’s interest and the tenant may deduct it from the next rent. Last month’s rent earns interest on the same terms.
The Statement of Condition — Due Within 10 Days
Massachusetts builds the move-out dispute defense into the very start of the tenancy. Under General Laws Chapter 186, Section 15B, when a landlord collects a security deposit the landlord must give the tenant a separate written statement of the present condition of the apartment within ten days after the tenancy begins (or when the deposit is received, whichever is later). The statement lists the existing condition, any damage already present, and any known code violations.
The statement is a two-way document. After receiving it, the tenant may add to it or correct it, sign it, and return it to the landlord, usually within fifteen days. Once both sides have recorded the move-in condition, that document becomes the baseline against which move-out damage is measured. A landlord who skips the statement of condition loses the strongest piece of evidence for later deductions — and hands the tenant an argument that the claimed damage was there all along.
Why the Statement of Condition Wins Deposit Cases
Deposit disputes turn on who can prove the unit’s condition at move-in. The statement of condition, signed by both parties, is the closest thing Massachusetts gives a landlord to a pre-agreed record. Pair it with dated move-in photographs and the landlord can show precisely what changed. Skip it, and every deduction becomes the landlord’s word against the tenant’s — a fight the landlord, who carries the burden of proof, usually loses.
What a Landlord May Deduct — and What Counts as Wear and Tear
General Laws Chapter 186, Section 15B narrows deductions to a short, specific list, and the landlord carries the burden of proving each one. A Massachusetts landlord may deduct from the deposit only for:
Permitted Deductions
- Unpaid rent that the tenant did not lawfully withhold, for the final month or any earlier period.
- Unpaid increases in real estate taxes that the tenant agreed in writing to pay under a valid tax-escalation clause.
- Reasonable cost of repairing damage beyond ordinary wear and tear caused by the tenant, a member of the household, or a guest — not including damage from ordinary use or from conditions the landlord failed to repair.
Not Deductible — Ordinary Wear and Tear
Ordinary wear and tear is the natural deterioration of a unit lived in normally, and Massachusetts requires the landlord to absorb it. These are not deductible:
- Faded or lightly scuffed paint, and small nail holes from hanging pictures.
- Carpet worn thin along walkways from ordinary foot traffic, with no stains or pet damage.
- Minor marks, loose grout, or caulk that has aged around tubs and sinks.
- Worn but still-functioning appliances and fixtures that reached the end of their useful life.
- Routine turnover cleaning that any unit would need between tenants.
Prorate Paint and Carpet for Age
Even where real damage justifies repainting or replacing carpet, a Massachusetts landlord generally cannot bill the tenant for a brand-new surface. Paint and carpet have an expected useful life, so a charge for damage should be prorated for the age of the surface — a tenant who damaged a carpet already several years into its life should pay only for the remaining life, not a whole new carpet. Full-price charges for old surfaces are a classic way landlords lose deposit disputes.
A Lease Clause Cannot Expand the Deduction List
Section 15B forbids a landlord from using a lease provision that conflicts with the statute — for example, a clause purporting to make the deposit non-refundable, to waive interest, or to allow deductions the law does not permit. Such a conflicting clause is unenforceable, and relying on it forfeits the landlord’s right to keep the deposit. Draft the lease to match the statute, not to work around it.
Takeaway
Deduct only for unpaid rent, agreed unpaid tax increases, and damage beyond ordinary wear and tear. Faded paint, worn carpet, small nail holes, and routine turnover cleaning are wear and tear you absorb. Prorate paint and carpet for age, and never rely on a lease clause that conflicts with Section 15B.
The 30-Day Return Deadline and the Sworn Itemized List
The deadline that ends most Massachusetts deposit fights is the thirty-day return rule. Under General Laws Chapter 186, Section 15B, within thirty days after the tenancy ends or the tenant vacates, whichever is later, the landlord must return the deposit or the balance remaining after lawful deductions. The clock runs from the end of the tenancy or actual surrender, not from some later date the landlord finds convenient.
The Sworn Itemized List of Damages
When a landlord keeps any part of the deposit for damage, the statement is not an ordinary letter. Section 15B requires an itemized list of the damages, sworn to by the landlord under the pains and penalties of perjury, that describes in precise detail the nature of the damage and the repairs needed to correct it. The landlord must also attach written evidence — estimates, bills, invoices, or receipts — supporting the cost of each repair, and provide all of this within the thirty-day window.
No Sworn Itemized List Forfeits the Right to Keep Anything
The itemization requirement is strict. If a landlord withholds part of the deposit for damage but fails to deliver the sworn, itemized list with supporting documentation within thirty days, the landlord forfeits the right to retain any portion of the deposit — even for real, documented damage. Note the distinction that trips landlords up: failing to itemize forfeits the deposit, while failing to return the deposit within thirty days is one of the violations that can trigger triple damages. Both are serious; one is catastrophic.
Takeaway
Return the deposit, the accrued interest, and a sworn itemized list of damages within thirty days of the tenancy’s end or move-out, with estimates or receipts attached. No sworn list forfeits every deduction; missing the thirty-day return entirely is one of the triple-damages violations.
Triple Damages — Which Violations Actually Trigger Them
This is the section Massachusetts landlords most often get wrong, and getting it wrong is expensive in both directions — landlords who assume every mistake triggers triple damages panic over minor slips, while landlords who assume nothing does ignore the failures that truly cost three times the deposit. General Laws Chapter 186, Section 15B does not impose triple damages for every violation. It reserves the triple-damages remedy for a specific, short list.
Under Section 15B, the tenant is awarded three times the deposit (or the balance owed), plus interest at 5%, court costs, and reasonable attorney’s fees, when the landlord fails to comply with one of these:
| Violation | Consequence |
|---|---|
| Failing to hold the deposit in the required separate interest-bearing Massachusetts account beyond creditors’ reach | Triple damages + 5% interest + costs + attorney’s fees |
| Failing to transfer the deposit to the new owner when the property is sold | Triple damages + 5% interest + costs + attorney’s fees |
| Failing to return the deposit (or balance) within thirty days after the tenancy ends | Triple damages + 5% interest + costs + attorney’s fees |
| Failing to give the sworn, itemized list of damages within thirty days | Forfeits the right to keep any deposit (not triple damages by itself) |
| Relying on a lease clause that conflicts with Section 15B | Clause void; forfeits the right to keep the deposit |
| Failing to pay interest the tenant is owed | Tenant may deduct interest from rent; unpaid last-month-rent interest carries its own treble remedy on the interest amount |
The practical lesson is precision. The three failures in the top rows — wrong account, no transfer on sale, and no thirty-day return — are the ones that convert a modest deposit into a multi-thousand-dollar judgment. A landlord who holds the deposit correctly, transfers or refunds it on a sale, and returns it on time has closed off the triple-damages exposure entirely, even if a single deduction is later disputed. Because courts have drawn careful lines about which failures carry the multiplier, verify the current law and get advice before assuming any particular slip does or does not trigger it.
How the Triple-Damages Math Adds Up
Take a deposit of one month’s rent that a landlord holds in a commingled operating account and then fails to return on time. The tenant can recover three times the deposit, plus five-percent interest, plus court costs, plus the tenant’s attorney’s fees. Because the attorney’s fees are shifted to the landlord, the total often dwarfs both the deposit and any legitimate deduction the landlord might have made. In Massachusetts, the cost of doing it right is trivial next to the cost of doing it wrong.
The Move-Out Procedure, Step by Step
Put the Section 15B rules together and a Massachusetts move-out becomes a repeatable checklist rather than a judgment call. Follow this sequence and the triple-damages exposure all but disappears.
Set it up correctly at move-in
Deposit the money in a separate interest-bearing Massachusetts account, give the receipt with bank name, location, and account number within thirty days, and deliver the statement of condition within ten days.
Inspect and photograph at surrender
When the tenant returns the keys, inspect promptly and photograph every room. Compare against the signed statement of condition and move-in photos to separate tenant damage from wear and tear.
Calculate lawful deductions
Deduct only for unpaid rent, agreed unpaid tax increases, and damage beyond wear and tear. Prorate paint and carpet for age, and gather an estimate, invoice, or receipt for each charge.
Prepare the sworn itemized list
Describe each item of damage in precise detail, swear the list under the pains and penalties of perjury, and attach the estimates, bills, invoices, or receipts that support every charge.
Return within thirty days with interest
Mail or deliver the remaining deposit, the accrued five-percent interest, and the sworn itemized list within thirty days of the tenancy’s end or move-out, using a method that gives you proof of mailing.
A defensible move-out record starts at move-in. Pair the statement of condition with a documented Massachusetts move-in and move-out checklist and photographs at both ends so you can prove exactly what the tenant caused. When you do withhold, a clean Massachusetts security deposit itemization form keeps the sworn statement organized, and a Massachusetts security deposit return letter documents the refund itself.
What Tenants Should and Should Not Do
Section 15B is a two-sided statute, and a tenant’s own conduct can strengthen or weaken a deposit claim. Two points come up constantly.
Do Not Use the Deposit as Last Month’s Rent
A Massachusetts tenant should never simply stop paying rent and tell the landlord to apply the security deposit. The deposit and the last month’s rent are separate sums; a tenant who withholds the final month’s rent expecting the deposit to cover it is treated as in default and can face a non-payment eviction. Pay rent as it comes due and pursue the deposit through the statutory process instead.