Massachusetts is the only state where veteran landlord attorneys routinely advise clients not to take a security deposit at all. The statute is that unforgiving, and we'll get to it. But the deposit is the second thing to get right here. The first is understanding the eviction clock, because once a Massachusetts tenancy goes sideways, every day of process you didn't plan for is a day of free occupancy you're funding.
The Massachusetts eviction clock: 14-day notices, cure rights, summary process
Nonpayment starts with a written 14-day notice to quit, whether the tenant holds a lease or a tenancy at will (MGL c.186, §§ 11-12). The cure rights differ. A tenant at will who hasn't received a similar notice in the previous 12 months can void the notice by paying everything owed within 10 days of receiving it, and your notice must include the statutory paragraph telling them so, or their cure window stretches to the court answer date. A tenant with a lease can cure all the way up to the day their answer is due in court by paying rent, interest, and costs.
Ending a tenancy at will without fault takes written notice equal to the rental period or 30 days, whichever is longer (MGL c.186, § 12), timed to land on a rent day. For lease violations other than nonpayment, the lease's own termination clause controls; Massachusetts has no statutory cure-or-quit ladder, so draft that clause with care.
When the notice expires, you file a summary process case in Housing Court or District Court. Between service, the entry date, the answer, mediation, and trial, a contested Boston-area eviction realistically runs one to three months, longer with counterclaims, and deposit violations are the counterclaim of choice. What never works is self-help. Changing locks or cutting utilities exposes you to the greater of three months' rent or the tenant's actual and consequential damages, plus costs and attorney fees (MGL c.186, § 14), and it's a criminal offense besides.
Since May 5, 2025, tenants can also petition to seal eviction records (MGL c.239, § 16), so a clean-looking screening report no longer proves a clean history; more on that below.
The one-month deposit cap, and the short list of what you may collect
At or before move-in, MGL c.186, § 15B lets you collect exactly four things: first month's rent, last month's rent at the same rate, a security deposit no larger than one month's rent, and the actual cost of a new lock and key. That list is exclusive. No pet deposit, no application fee, no move-in fee, no cleaning fee. On a $1,200 unit, a $2,400 deposit is simply illegal; so is a $300 pet deposit stacked on a one-month security deposit. (Monthly pet rent is fine, because it's rent.)
Compare the neighbors and you'll see how tight this is: Maine allows two months' deposit, Connecticut allows two (one for tenants 62 and over), and New Hampshire caps at one month's rent or $100, whichever is greater. Massachusetts stops at one month and then regulates every hour of the deposit's life.
Holding it: the escrow account, the receipts, the statement of condition
The deposit must go into a separate interest-bearing account in a Massachusetts bank, shielded from your creditors. You owe the tenant a receipt when you take the money, and a second receipt within 30 days naming the bank, its address, and the account number. Within 10 days of the tenancy starting you must also hand over a signed statement of condition describing the unit's existing damage; the tenant gets 15 days to submit their own corrections. Every one of those papers becomes evidence later, which is the point.
Interest runs at 5% per year, or the bank's actual rate if lower, payable each anniversary and at the end of the tenancy. Rentari tracks those anniversary dates and the account paperwork per lease, which is exactly the kind of bookkeeping this statute punishes you for improvising.
Returning it: 30 days, a sworn itemization, and treble damages
Within 30 days after the tenancy ends, return the deposit or send an itemized list of deductions sworn to under the pains and penalties of perjury, with receipts or estimates attached. Lawful deductions are only unpaid rent, a valid tax-escalator share, and damage beyond reasonable wear and tear, and you can't deduct for damage you failed to list on that move-in statement of condition. Blow the account requirement, the 30-day return, or the transfer-to-buyer rules and the tenant is entitled to three times the deposit plus 5% interest, court costs, and attorney fees (MGL c.186, § 15B(7)). Lesser paperwork failures forfeit your right to keep any of it. This is why many Massachusetts landlords collect first and last month's rent and skip the deposit entirely; last month's rent still earns the tenant 5% or actual interest annually and needs a receipt, but it escapes the escrow-and-itemization machinery.
Entry rights: five lawful reasons and no such thing as a casual drop-in
Massachusetts doesn't give landlords a general right of entry on 24 hours' notice. Section 15B(1)(a) permits entry only to inspect the premises, make repairs, show the unit to prospective tenants, buyers, or lenders, act under a court order, inspect within the last 30 days of tenancy for damage, or check an apparently abandoned unit. A lease clause purporting to allow entry for other reasons is void. No statute fixes an hour count, so reasonable advance notice at reasonable times is the standard; write it into the lease and honor it, because entry abuse feeds quiet-enjoyment claims under MGL c.186, § 14 with that three-months'-rent floor.
Rent rules: no late fee before day 30, and no rent control (for now)
Massachusetts is the strictest late-fee state in the country: no late fee, interest, or penalty may be imposed until the rent is 30 days overdue, and a lease term saying otherwise is unenforceable (MGL c.186, § 15B(1)(c)). You can still serve the 14-day notice to quit on day one of nonpayment; you just can't charge for lateness for a month.
Raising rent mid-lease is impossible unless the lease says otherwise. For a tenancy at will, a rent increase is legally a termination plus an offer of a new tenancy, so it needs the same notice as ending the tenancy: a full rental period or 30 days, whichever is longer. Statewide rent control has been banned since the 1994 ballot repeal (MGL c.40P); Boston's home-rule push to bring back rent stabilization has repeatedly stalled in the Legislature, so as of 2026 there's no cap anywhere in the state, but this is the live political fight to watch.
Disclosures and habitability: lead law, the sanitary code, and 127L
The disclosure that bites hardest is lead. For any pre-1978 building, Massachusetts requires the Tenant Lead Law Notification, and if a child under 6 will live in the unit, the property must be deleaded or brought under interim control (MGL c.111, § 197). Refusing to rent to families with young children to dodge deleading is discrimination, and the state enforces it.
Habitability lives in the State Sanitary Code (105 CMR 410), down to heating-season temperatures. When certified code violations endanger health or safety, tenants may withhold rent (MGL c.239, § 8A) or, after you've been notified in writing and fail to start repairs within 5 days and finish within 14, repair and deduct up to four months' rent in any 12-month period (MGL c.111, § 127L). Between the sanitary code and the deposit statute, documentation is your whole defense; our forms library has the Massachusetts statement of condition, notices, and lease riders, and the Massachusetts quick-reference page keeps the numbers handy.
What changed: 2024 to 2026
Three real shifts. First, the Affordable Homes Act (H.4977, signed August 6, 2024) legalized accessory dwelling units by right statewide starting February 2025, a genuine opening for owners adding units. Second, the same act created eviction-record sealing, live since May 5, 2025 (MGL c.239, § 16): no-fault and tenant-win cases can seal immediately after appeal rights lapse, nonpayment cases after 4 years with a certified economic hardship, fault cases after 7 years, and consumer reporting agencies can't report sealed records. Screen with that in mind. Third, since August 1, 2025, the broker fee belongs to whoever engaged the broker; a landlord who lists through an agent can no longer pass that fee to the tenant or fold it into move-in charges (FY2026 budget; see the state's official FAQ). Budget your marketing accordingly: on a $2,500 Boston listing, that's a $2,500 cost that used to land on the tenant.
Massachusetts landlord FAQ
What happens if I return the deposit on day 35?
You're exposed to treble damages: three times the deposit plus 5% interest, costs, and attorney fees (MGL c.186, § 15B(7)). There's no good-faith grace period in the statute, which is why the 30-day return is the one deadline no Massachusetts landlord should ever run close.
Is taking last month's rent instead of a deposit really safer?
Mostly, yes. Last month's rent avoids the escrow account, statement of condition, and sworn itemization, but it still earns the tenant 5% or actual bank interest paid annually, and it needs a receipt. The tradeoff: it can only ever cover the last month, not damage.
Can I charge a late fee after two weeks?
No. No late fee, interest, or penalty until rent is 30 days overdue (MGL c.186, § 15B(1)(c)). You can and should still serve the 14-day notice to quit promptly if nonpayment is becoming a pattern.
Who pays the broker fee in 2026?
Whoever hired the broker. Since August 1, 2025, a landlord who engages the listing agent pays that agent's fee and can't shift it to the tenant as a condition of the lease.
Do sealed evictions show up in tenant screening?
No. Once sealed under MGL c.239, § 16, the record is off-limits to consumer reporting agencies, and applicants may lawfully answer as if the case doesn't exist. Lean on landlord references, income verification, and your own criteria applied evenly.
This guide is general information for Massachusetts landlords, not legal advice. Chapter 186 case law is dense and the penalties are real, so before acting on a deposit, notice, or fee question, read the current statute text or talk to a Massachusetts landlord-tenant attorney.