G.L. c. 186, § 18; G.L. c. 239, § 2A; G.L. c. 260, § 5A
Tenant retaliation in Massachusetts — the six-month presumption
A claim in Massachusetts trial courts · Last verified August 26, 2026
Retaliation is the claim that makes the rest of Massachusetts tenant law usable. A tenant who can be evicted for complaining will not complain, and the habitability and code-enforcement rules would sit unused.
Section 18 answers that with a presumption. A notice to quit, a rent increase or a substantial change in the terms of the tenancy, received within six months after the tenant did something protected, is presumed to be a reprisal — and the landlord can rebut it only by clear and convincing evidence.
What the claim is
You reported bad conditions, joined a tenants' union, or took your landlord to court, and the landlord came after your tenancy.
Where the right comes from
G.L. c. 186, § 18 for the damages claim, and G.L. c. 239, § 2A for retaliation as a defence to the eviction itself.
What is protected
Section 18 lists the acts that trigger it, and the list is wider than most people assume:
- commencing, proceeding with, or obtaining relief in any judicial or administrative action to enforce a law regulating residential premises;
- reporting a violation or suspected violation of any health or building code, by-law, ordinance, or state or federal law regulating residential premises, to the board of health, the Boston commissioner of housing inspection, or any other board with that objective;
- reporting or complaining of such a violation in writing to the landlord or the landlord's agent — note that a written complaint to the landlord alone is protected, with no agency involved;
- organising or joining a tenants' union or similar organisation;
- exercising rights under G.L. c. 164, § 124D concerning utility service; and
- making or expressing an intention to make a payment of rent to an organisation of unit owners under G.L. c. 183A, § 6(c).
What a tenant has to prove
- A protected act from that list;
- An adverse action — a notice of termination other than for non-payment of rent, a rent increase, or a substantial alteration in the terms of the tenancy; and
- Causation — which the presumption supplies where the timing fits.
The presumption
Section 18 provides that receipt of a notice of termination (except for non-payment of rent), a rent increase, or any substantial alteration in the terms of the tenancy within six months after the tenant did a protected act creates a rebuttable presumption that the landlord's action was a reprisal.
The rebuttal standard is demanding. The landlord must prove by clear and convincing evidence both that the action was not a reprisal and that there was sufficient independent justification for it — and that the landlord would in fact have taken that action, in the same manner and at the same time, regardless of the tenant's protected conduct.
That last clause is what defeats most rebuttals. A landlord who had already decided to raise the rent must show not only a business reason but that the increase would have come at that moment anyway. Documentation created before the tenant's complaint is what carries it; documentation created afterwards rarely does.
Non-payment is excluded. A notice to quit for non-payment of rent does not trigger the presumption — though a tenant may still prove retaliation without it.
How long you have to file
Four years, under G.L. c. 260, § 5A, which names § 18 expressly among the consumer-protection statutes it covers. The period runs from the retaliatory act.
As a defence in summary process, under c. 239 § 2A, it is available whenever the landlord sues.
What has to happen before you file
Nothing. In practice the protected act should be documented — a dated written complaint, an inspection report, a filed case — because the presumption runs from it.
What the claim pays
Section 18: damages "which shall not be less than one month's rent or more than three month's rent, or the actual damages sustained by the tenant, whichever is greater, and the costs of the suit, including a reasonable attorney's fee."
Read the structure. The floor is one month's rent and the statutory band tops out at three — but actual damages control if they exceed three months' rent. Fees are mandatory.
And it is a complete defence to the eviction. Under c. 239 § 2A, a finding of retaliation defeats the possession claim. That is often worth more than the damages.
Chapter 93A on the same facts adds the willful-or-knowing multiplier, subject to the rule against recovering the same loss twice.
No waiver. Section 18 provides that any waiver of it in a lease or rental agreement is void and unenforceable.
Which court
Housing Court, uncapped. District Court or the Boston Municipal Court within the $50,000 threshold. Superior Court above it. Most commonly, as a defence and counterclaim in summary process.
Common defenses
- Clear and convincing independent justification — the landlord would have acted the same way, at the same time, regardless.
- The notice was for non-payment, which is outside the presumption.
- More than six months passed, so the presumption does not arise and the tenant must prove causation directly.
- The act was not protected — an oral complaint to the landlord, for instance, where the statute protects written ones.
- No adverse action — the change in terms was not substantial.
What people get wrong
The presumption is the case. Once the timing fits, the landlord carries a clear-and-convincing burden, which is far heavier than the ordinary civil standard.
A written complaint to the landlord counts. No inspector and no lawsuit is required.
Non-payment notices are carved out — but only from the presumption, not from the claim.
Three months' rent is not a ceiling. Actual damages control if they are larger.
A lease cannot waive it. The statute voids any attempt.
It defeats the eviction as well as paying damages, which is why it is raised as a defence and a counterclaim together.
Where it came from
Retaliation statutes appeared across the country in the 1970s alongside the warranty of habitability, and for the same reason: a right that a landlord can punish you for exercising is not a right. Massachusetts enacted § 18 in that wave and made two choices that gave it teeth.
The first was the presumption. Retaliation is a state-of-mind case, and a tenant will almost never have direct evidence of one. Shifting the burden on a timing trigger converts an unprovable claim into a provable one.
The second was the rebuttal standard. Requiring clear and convincing evidence, and requiring the landlord to show it would have acted in the same manner and at the same time, closed the escape that a lower standard would have left open — every landlord can produce a business reason after the fact.
The six-month window is the compromise. It is long enough to cover the period when reprisal is likely, and short enough that a tenant cannot make one complaint and claim protection indefinitely. The Appeals Court has continued to apply the clear-and-convincing standard strictly, most recently in Management Company Inc. v. Casalinuova (2026).
Common questions
What counts as a protected activity?
Reporting a code violation to the board of health, complaining in writing to your landlord, joining a tenants' union, or bringing or participating in a case about the tenancy.
How long does the presumption last?
Six months from the protected act.
What does the landlord have to show to beat it?
Clear and convincing evidence of an independent justification, and that it would have taken the same action in the same manner and at the same time regardless of what you did.
What if I did not pay the rent?
A non-payment notice does not trigger the presumption. You can still prove retaliation, but without the presumption's help.
What is the claim worth?
The greater of one to three months' rent or your actual damages, plus costs and a reasonable attorney's fee — and it is a complete defence to the eviction.
How long do I have to sue?
Four years. Chapter 260 § 5A names § 18 by section.