Key Takeaways
•The deadline: Under the Massachusetts security deposit law (G.L. c. 186, § 15B), return the deposit within 30 days of move-out, with a sworn, itemized list of any lawful deductions.
•The stakes: Under § 15B, three paperwork failures carry mandatory triple damages plus interest, court costs and attorney's fees: no proper bank account, a late return, and no transfer of the deposit when you sell.
•The defense: Your move-in file decides what you can keep, but only if you also meet the deadline. Strong records do not cure a late return.
•The separate risk: Pre-1978 units carry lead paint duties at every turnover, whether or not you take a deposit.
Is the 30-Day Clock Already Running on Your Latest Move-Out?
Say a tenant moved out October 1. Your deadline to return the deposit is October 31. There is no extension and no grace period.
Under G.L. c. 186, § 15B, that deposit stays the tenant's money unless the statute lets you keep part of it. The clock starts at the end of the lease term, or at move-out for a tenant-at-will (a renter with no fixed lease).
Massachusetts caps a security deposit at one month's rent. Miss certain steps and you're on the hook for three times that amount, plus interest, court costs and attorney's fees.
Massachusetts Move-In Cost Rules for Tenants and Landlords
Key Massachusetts security-deposit and move-in money rules cited under G.L. c. 186, § 15B.
| Category | Allowed up-front charges | Security deposit cap | Return deadline | Penalty |
|---|---|---|---|---|
| Allowed at or before move-in | first month’s rent, last month’s rent at the same rate, a security deposit no larger than one month’s rent, and the cost of a new lock and key | - | - | - |
| Security deposit limit | - | no larger than one month's rent | - | - |
| Return deadline after move-out | - | - | within 30 days | - |
| Damages for certain violations | - | - | - | three times the deposit plus interest, costs and attorney’s fees |
Source:G.L. c. 186, § 15B (as reported)
A small paperwork miss turns into a much larger payout fast.
The rules have also tightened. In Peebles v. JRK Property Holdings (Aug. 1, 2025), the Supreme Judicial Court held that § 15B does not allow deductions for reasonable wear and tear. Amendments in St. 2025, c. 9, effective August 1, 2025, extend the move-in charge limit to a landlord's agents and let the state housing office write rules for an optional fee in place of a deposit. At or before move-in, a landlord or agent may collect only first and last month's rent, a deposit of up to one month's rent, and the cost of a new lock and key. Up-front pet and cleaning fees are not on that list.
What Are the Five Steps From Keys Returned to Deposit Returned?
1. Did You Pull the Full Move-In File?
Start with the file, not the damage. You need the signed deposit receipt and the Statement of Condition, due within 10 days of the tenancy starting (or of receiving the deposit, whichever is later).
Also pull:
•the tenant's written additions, which they had 15 days to return;
•the bank receipt, due within 30 days;
•your move-in photos and videos.
You cannot charge for damage already listed at move-in, unless you repaired it and the tenant caused it again.
2. Did You Inspect and Document Everything?
Photograph and film every room: closets, appliances, floors, walls, ceilings, windows and bathrooms. Compare each item against the move-in record. This is what supports your deductions and keeps you from billing a tenant for ordinary aging.
3. Are You Separating Damage From Wear and Tear?
Section 15B allows only three kinds of deductions:
•unpaid rent or water charges;
•an unpaid tax increase under a valid tax escalation clause (a lease term passing property-tax hikes to the tenant); and
•tenant-caused damage beyond reasonable wear and tear, meaning the normal aging that comes from living in a home.
Peebles holds that painting, carpet repair or similar refurbishment needed because of reasonable wear and tear cannot come out of the deposit. A lease clause that charges for it anyway conflicts with § 15B and is void under § 15B(8).
In plain English: a strong lease clause will not save an unlawful deduction.
4. Did You Build the Sworn Deduction Package?
Section 15B requires your itemized list to describe each deduction "in precise detail," signed under the pains and penalties of perjury. That means you are swearing the list is true. "Wall damage, $500" doesn't cut it.
Attach bills or receipts for finished work. If a repair isn't done yet, § 15B lets you attach written contractor estimates instead. Name the exact item and location, and match each amount to its estimate, so a slow contractor doesn't push you past the deadline.
Skip the sworn list and you lose the right to keep any part of the deposit, even for real damage (§ 15B(6)).
5. Did You Return the Balance and Interest on Time?
Return the balance, plus any interest owed, within 30 days. Mail it to the tenant's written forwarding address by a trackable method, and keep proof of delivery.
Why Does Lead Paint Ride Along With Every Turnover?
Much of Greater Boston's rental housing was built before 1978, the cutoff year for the Massachusetts Lead Law.
That matters because the Lead Law covers homes built before 1978. Under G.L. c. 111, § 197, when a child under six lives in a unit with dangerous levels of lead, the owner must abate or contain the hazard. Under G.L. c. 111, § 199, an owner can be held liable for a young child's lead poisoning caused by not complying, without any proof of negligence.
The duties come with deadlines. Every prospective tenant of a pre-1978 unit gets the Tenant Lead Law Notification before signing the rental agreement, whether or not a child under six will live there. Federal disclosure records must be kept for 3 years from the start of the lease. After a change of ownership, the new owner has 90 days to abate or contain lead hazards when a child under six will live in the unit.
Massachusetts Lead Paint Compliance Deadlines and Triggers
Selected federal and Massachusetts timing rules for lead disclosure, record retention, deleading triggers, and renovation notices.
| Category | Disclosure timing | Disclosure retention | Deleading trigger | Change of ownership | Renovation notice |
|---|---|---|---|---|---|
| Tenant Lead Law Notification delivery | Prior to entering into a tenancy agreement | - | - | - | - |
| Federal disclosure retention period | - | 3 years from commencement of the leasing period | - | - | - |
| Child residence requirement | - | - | Child under six resides in the premises | - | - |
| Lead level requirement | - | - | Material contains dangerous levels of lead | - | - |
| New owner delead timeframe | - | - | - | 90 days | - |
| Occupant notice before renovation begins | - | - | - | - | No more than 60 days before work begins |
Source:40 CFR 745.113(c) (as reported); 40 CFR Part 745 Subpart E (RRP) (as reported); M.G.L. c.111 §197(a) (as reported)
A licensed lead inspection tells you where a unit stands before the next lease-up. In Boston, that inspection averages $542 (Angi, June 2026).
Boston Lead Paint Inspection Cost Range
Published Angi cost estimates for lead paint inspections in Boston, Massachusetts.
| Series | Label | Value |
|---|---|---|
| Lead paint inspection cost | Typical low | $325 |
| Lead paint inspection cost | Average cost | $542 |
| Lead paint inspection cost | Typical high | $758 |
That is a known cost next to open-ended strict liability. Massachusetts law also makes it unlawful to refuse to rent a unit because it contains lead or because renting it would trigger Lead Law duties (G.L. c. 111, § 199A). Deleading to a Letter of Full Compliance removes the risk. A Letter of Interim Control, issued after a licensed risk assessor approves the urgent repairs, allows up to two years to get there.
In April 2026, DPH released revised Tenant Lead Law Notification documents (Mass.gov, read Oct. 30, 2026). Download the current form from Mass.gov before each lease, and confirm the version with your attorney.
Which Edge Cases Catch Experienced Boston Owners?
What If You Are Selling the Building?
Under § 15B(5), the deposit transfers to the buyer, and § 15B(7) sets triple damages for a failure to transfer it. The new owner has 45 days to tell each tenant in writing that it holds the deposit, and § 15B(7A) sets the same 45 days for last month's rent. Put the deposit bank account, each tenant's payment record, and the transfer notices on your closing checklist.
What If You Want a Deposit-Alternative Fee?
The August 1, 2025 amendment only lets the state housing office write rules allowing these fees. If those rules exist, any fee is capped at one month's rent and must be optional for the tenant. Confirm with your attorney whether such rules are in effect. A landlord cannot create its own non-refundable fee.
What About Annual Interest?
Under § 15B(3)(b), annual interest is 5% or the lower rate your bank actually pays. You're also required to send an interest statement on each tenancy's anniversary.
What Are the Strongest Arguments Against Taking a Deposit?
"Should I Skip the Deposit and Just Take First and Last Month's Rent?"
You can. The deposit is optional, and skipping it means skipping its bank account requirement, condition statement, and refund rules.
But collecting last month's rent still requires a receipt and annual interest, and lead law duties apply regardless. A deposit-alternative fee may become an option later (see above).
The real trade-off: fewer rules in exchange for no money set aside for damage.
"Are Triple Damages Really a Serious Risk?"
Yes. Under § 15B(7), the landlord also pays the tenant's court costs and attorney's fees, which makes even a small claim worth a lawyer's time. The multiplier applies to plain paperwork misses, not just bad faith. In a hypothetical example, a $2,500 deposit returned late could become a $7,500 claim, plus interest and fees.
"Do Good Move-Out Photos Justify the Deduction?"
Not by themselves. Deductions depend on the sworn list sent within the 30-day window, and without a move-in record, proving the damage happened during the tenancy gets difficult. A late return alone can trigger triple damages under § 15B(7), even when the damage was real.
What Should Your Year-End Compliance Calendar Include?
•Right after any move-out: Mark the 30-day deadline and send the refund before it hits.
•Before the next lease: Deliver the Statement of Condition within 10 days and the bank receipt within 30. Download the current lead notification from Mass.gov and confirm the version with your attorney.
•Every year: Send an interest statement on each tenancy's anniversary.
•Always: Keep one file per tenancy, and keep it after the tenant leaves.
When you sell, a careful buyer will ask for clean deposit records and a clear lead paint history. Missing files can slow or sink a deal.
Before relying on any step, check the current text of G.L. c. 186, § 15B and Mass.gov's Lead Law pages (read Oct. 30, 2026).
Buying a building with tenants in place? Send me the address and I'll run the numbers, with the deposit and lead paint records on the list of things to check before closing.
This article is general information, not legal or tax advice. Talk to your CPA and attorney about your own situation.
