Can a Massachusetts Landlord Deduct an Additional-Occupant Fee From a Security Deposit?
Massachusetts strictly limits security-deposit deductions. Learn when unpaid rent can be deducted, why an occupant-rule violation is not automatically an extra-rent charge, and what records matter at move-out.
The short answer
Massachusetts General Laws chapter 186, section 15B sharply limits what may be taken from a residential security deposit after a tenancy ends. The statute allows deductions for qualifying unpaid rent or water charges, a qualifying unpaid real-estate-tax increase, and reasonable repair costs for tenant-caused damage beyond ordinary wear and tear. It also states that no deduction may be made from a security deposit for a purpose outside the statute.
An unauthorized additional occupant can raise a separate lease-compliance issue, but that does not by itself establish that a particular monthly fee became unpaid rent. If a landlord wants to characterize an additional-occupant charge as unpaid rent, the first question is where the signed lease, incorporated addendum, or later valid agreement actually creates that payment obligation. A label added after move-out does not resolve the contractual question.
Massachusetts limits security-deposit deductions to specific categories
Section 15B(4) requires the landlord, within 30 days after the end of the tenancy described by the statute, to return the security deposit or the balance after lawful deductions. The listed deduction categories include unpaid rent or qualifying water charges, an unpaid increase in real-estate taxes owed under a valid tax-escalator clause, and reasonable repair costs for damage caused by the tenant or a person under the tenant's control or on the premises with the tenant's consent, excluding reasonable wear and tear.
The statute separately says that no deduction may be made from a security deposit for any purpose other than those set out in section 15B. That is why a move-out charge should be classified by its legal basis rather than simply called a fee, penalty, breach charge, or unpaid rent.
An occupancy rule and an extra-rent term are different questions
A lease may require written approval before an additional occupant, roommate, subtenant, or guest becomes a resident. Violating that rule can present a lease issue. But the existence of an approval requirement does not, without more, identify a dollar amount that automatically becomes rent when the rule is violated.
For a claimed additional-occupant amount to be treated as unpaid rent, examine the actual rent terms: the stated monthly rent, any signed addendum, any later amendment, and any provision that expressly changes the rent when occupancy changes. If the landlord relies on an incorporated addendum that the tenant says was never received, obtain the complete document and do not assume its enforceability either way; incorporation, delivery, assent, and the exact wording can be fact-specific contract questions.
Calling a charge ‘unpaid rent’ does not decide whether rent was actually owed
Massachusetts allows a security-deposit deduction for unpaid rent that was not validly withheld or deducted. The important word is unpaid: there must first be a rent obligation that was actually due. A landlord's post-move-out description of a disputed amount as rent does not by itself establish the underlying obligation.
Compare the lease and all addenda with the rent ledger and communications from the period when the extra occupant was known. If the landlord identified no additional rent during the tenancy and the written agreement contains no obvious price term, that evidence may be relevant to the dispute, but it does not let an article decide the contract. Ask for the exact clause, the complete addendum, the dates the charge allegedly accrued, and a written ledger showing how the amount was calculated.
A security-deposit deduction is not the same as every possible contract claim
Section 15B controls what may be retained from the security deposit. That does not mean every dispute arising from a lease disappears merely because a particular amount cannot properly be taken from the deposit. Massachusetts Housing Court guidance recognizes, for example, that a landlord who loses the right to hold a deposit may still have to bring a separate civil or small-claims action for an otherwise valid property-damage claim.
The same practical distinction matters with an alleged occupancy breach: first determine whether section 15B permits the proposed security-deposit deduction; separately determine whether the lease creates any enforceable obligation outside the deposit. Do not treat the security deposit as a shortcut for resolving a disputed contract term.
Massachusetts also has strict rules for how the deposit is held
Section 15B requires a security deposit to be kept in a separate, interest-bearing account in a Massachusetts bank under the statutory conditions. Within 30 days after receiving the deposit, the landlord must give the tenant a receipt identifying the bank and location, the amount deposited, and the account number.
The statute provides a right to immediate return when the landlord fails to comply with that account paragraph, and Massachusetts court guidance states that a landlord who does not properly hold the deposit or provide the required notice of where it is deposited can lose the right to keep it. A tenant who does not recall receiving the bank information should preserve the original deposit receipt, lease packet, emails, annual interest records, and any later account information rather than assuming what did or did not occur years earlier.
The 30-day move-out record matters
For a tenancy ending under the circumstances covered by section 15B(4), the landlord generally has 30 days to return the security deposit or the lawful balance. Damage deductions have additional sworn-itemization and cost-documentation requirements. A disputed additional-occupant amount that is being called unpaid rent should be compared with the lease and ledger, while any physical-damage deduction should be evaluated under the separate damage-documentation rules.
Keep the move-out date, key-return record, forwarding address, security-deposit accounting, refund payment, postmarked envelope or email timestamp, and every version of the landlord's ledger. Dates matter because Massachusetts attaches specific consequences to several security-deposit handling failures, and the outcome can depend on exactly which statutory duty was missed.
What to preserve when an extra-occupant charge appears after move-out
Keep the complete signed lease, every referenced addendum, any roommate or sublet approval, messages showing when the landlord learned of the additional occupant, notices or warnings issued during the tenancy, the full rent ledger, proof of every rent payment, the original security-deposit receipt, bank-account notice, annual interest records, and the final security-deposit accounting.
If an addendum is produced only after the dispute begins, preserve the file exactly as received and ask when and how it was originally delivered and agreed to. If the dollar amount changed over time, keep each version. The goal is to separate three issues cleanly: whether occupancy violated the lease, whether an additional rent obligation existed, and whether section 15B permits that amount to be taken from the security deposit.
Use Max Rental Tools to organize the paper trail
Max Rental Tools includes an Occupant / Roommate Addendum, Lease Amendment, Rent Ledger, Security Deposit Itemization, and Security Deposit Refund Statement. These tools can help landlords and tenants document occupancy changes and move-out accounting prospectively, but they do not create a fee that the existing lease never imposed.
For a Massachusetts dispute, use the current text of General Laws chapter 186, section 15B and Massachusetts court or Attorney General guidance as the controlling public sources. A fact-specific dispute over an incorporated addendum, assent, or damages may warrant advice from a qualified Massachusetts housing attorney.
Common questions
Can a Massachusetts landlord deduct an additional-occupant fee from a security deposit?
Only if the amount fits a deduction category allowed by General Laws chapter 186, section 15B. The statute permits specified deductions such as actual unpaid rent and qualifying damage costs and says no deduction may be made for another purpose. Whether a claimed occupant charge is actually unpaid rent depends on the underlying rental agreement and facts.
Does violating a roommate or additional-occupant clause automatically create extra rent?
Not automatically from section 15B. An occupancy rule can create a lease-compliance issue, while an additional rent obligation depends on the lease, incorporated addenda, later agreements, and other contract facts. Ask for the exact written provision establishing the amount.
How long does a Massachusetts landlord generally have to return the security deposit after the tenancy ends?
Section 15B(4) generally requires return of the deposit or lawful balance within 30 days after the end of the tenancy described by the statute, subject to the statute's detailed deduction and accounting rules.
What bank information must a Massachusetts landlord provide for a security deposit?
Section 15B(3)(a) requires the deposit to be held in a separate interest-bearing Massachusetts bank account and requires a receipt within 30 days identifying the bank and location, the amount deposited, and the account number.
If a landlord cannot keep the deposit, does every other lease claim disappear?
No. Security-deposit restrictions and an independent contract or damage claim are different questions. Massachusetts court guidance explains that some claims may have to be pursued separately even when the landlord has lost the right to hold the deposit.
Official sources
Massachusetts Legislature — General Laws c. 186, § 15BMassachusetts Housing Court — What Landlords Can Use Security Deposits ForMassachusetts Housing Court — Holding a Security DepositMassachusetts Housing Court — Returning or Getting Back a Security DepositMassachusetts Attorney General — Landlord and Tenant RightsContinue your check
Use the state directory for current jurisdiction-specific rules, calculate the proposed increase, then prepare the appropriate rental document only after the legal-rule checks are complete.