Massachusetts Security Deposit Laws: The One-Month Cap, 5% Interest, 30-Day Return, and 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 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.

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.

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.

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 five percent 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 five percent, the “or the lesser bank rate” language matters: the landlord owes the tenant the interest the account genuinely earned, and only up to five percent.

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.

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.

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.

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.

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 five percent, court costs, and reasonable attorney’s fees, when the landlord fails to comply with one of these:

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.

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.

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.

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.

Provide a Forwarding Address in Writing

The statute keys the landlord’s thirty-day return obligation to the end of the tenancy or the tenant’s surrender, not to a forwarding address, so the landlord’s duty to act is not suspended merely because the tenant has not written one down. As a practical matter, though, a tenant who leaves a clear written forwarding address makes the return smoother and removes any excuse for delay. Some landlords and secondary guides describe the forwarding address as a “condition precedent”; the safer reading is that the deadline runs from move-out, so a tenant should provide the address in writing and a landlord should never treat its absence as a reason to sit on the funds. When in doubt, verify the current law.

Most Massachusetts deposit disputes never reach a courtroom, but when they do they usually land in small claims court — a forum built to be used without a lawyer. As of 2026, the Massachusetts small claims limit is seven thousand dollars for most consumer and deposit cases (with no dollar cap for motor-vehicle property-damage claims), though the specific figure and any exceptions change over time, so verify the current limit before filing. In a deposit case the tenant can ask the court to apply the triple-damages multiplier and to shift attorney’s fees, which is why even a modest deposit can produce a substantial judgment.

The pattern is consistent: Massachusetts deposit cases are won on paper and on procedure. The landlord who holds the money correctly, documents condition at both ends, itemizes under oath, pays interest, and returns on time rarely loses — and the tenant who keeps their own copies of the receipt, the statement of condition, and the itemized list is equally well positioned to recover a wrongful withholding.

Beyond a routine move-out, two situations trip up Massachusetts landlords because the deposit rules interact with other events.

When the Property Is Sold

If a landlord sells the rental, Section 15B requires that the deposit follow the property. The seller must transfer the deposit, with any accrued interest, to the new owner — the successor — or account for and return it, and the new owner steps into the landlord’s obligations. This matters enormously because failing to transfer the deposit on a sale is one of the three violations that trigger triple damages. A landlord buying an occupied Massachusetts property should confirm in the closing that every deposit, plus interest, is transferred and documented, because the new owner can inherit liability for a deposit that was never handed over.

Roommates and a Single Deposit

Where several tenants share a lease and a single deposit, Massachusetts treats the deposit as one sum tied to the tenancy. The landlord’s thirty-day return obligation is generally triggered when the tenancy as a whole ends and the unit is surrendered, not each time one roommate moves out mid-lease. Sorting out each roommate’s share of a refund is usually a private matter among the tenants; the landlord should return the single deposit to the tenants collectively unless a written agreement directs otherwise.

Every rule above ultimately turns on proof. Massachusetts places the burden on the landlord to justify each deduction and to show the deposit was handled correctly, which means the landlord who cannot document a charge — or the account, the receipt, or the interest — loses it. Build the evidence file across the whole tenancy, not at the end.

At Move-In

• The statement of condition, delivered within ten days and signed by the tenant.
• The deposit receipt showing the bank name, location, and account number.
• Timestamped photos or video of every wall, floor, fixture, and appliance, stored where the date cannot be doubted.

During the Tenancy

• Records of each annual interest payment or credit to the tenant.
• A dated log of every maintenance request and the landlord’s response, which also rebuts a habitability defense — see Massachusetts habitability laws.
• Records of any lawful entry to inspect or repair, made with proper notice under Massachusetts landlord entry laws.

At Move-Out

• A second set of timestamped photos taken at surrender, to compare against the statement of condition.
• Estimates, bills, invoices, or receipts for every charge, attached to the sworn itemized list.
• Proof that the deposit, interest, and sworn list were mailed within thirty days.

The cheapest deposit dispute is the one that never happens. A few disciplined habits protect a Massachusetts landlord across an entire portfolio.

• Open the correct account first. A separate interest-bearing Massachusetts account, beyond your creditors’ reach, before you accept any deposit.
• Send the receipt and the statement of condition on time. The receipt within thirty days, the statement of condition within ten days — both calendared.
• Pay the interest every year. Credit or pay five-percent interest annually so a tenant never has to deduct it from rent.
• Set the deposit at one month, and collect only the four permitted charges. No non-refundable fees, no extra move-in charges.
• Swear and document every deduction, and return within thirty days. A sworn itemized list with receipts, mailed with proof, well before day thirty.
• Screen carefully before you ever hand over keys. The tenants most likely to leave a unit in disputed condition are often the ones a thorough screening would have flagged.

That last point is where most disputes are actually won — before the lease is ever signed. A prior eviction, a pattern of damage, or unstable finances rarely appears out of nowhere; it usually leaves a trail an applicant’s history reveals. Screening for it is the single highest-leverage habit a Massachusetts landlord can build.

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