Massachusetts Security Deposit Law (Statute Explained)

Source-based guide to Massachusetts security deposit law, including the cited statute section and the key rules on deadlines, deductions, and tenant protections.

## The statute matters because it controls the recovery path This page is the source-based version of the Massachusetts security deposit guide. If your landlord kept money, missed the deadline, sent weak deductions, or ignored your demand, the statute is not just background reading. It helps you identify which rule was broken and what record you need to build next. This page is built around the approved Massachusetts source material for this build and the rules that matter most in real security deposit disputes. If you want the simpler version first: [Plain-English Law Overview](/massachusetts/security-deposit-law/) --- ## Official sources used for this guide If you want to go straight to the official and source-backed material, these are the key places to start: - [Massachusetts Legislature - General Laws, Chapter 186, Section 15B](https://malegislature.gov/Laws/GeneralLaws/PartII/TitleI/Chapter186/Section15b) - [Mass.gov - Massachusetts law about tenants' security deposits](https://www.mass.gov/info-details/massachusetts-law-about-tenants-security-deposits) - [Mass.gov - Mandatory statement of condition](https://www.mass.gov/info-details/mandatory-statement-of-condition) - [Mass.gov - Small Claims](https://www.mass.gov/small-claims) - [Mass.gov - Small Claims Court](https://www.mass.gov/info-details/small-claims-court) - [Mass.gov - Small Claims Court Forms](https://www.mass.gov/lists/small-claims-court-forms) - [Mass.gov - File a small claim in the Boston Municipal Court, District Court, or Housing Court](https://www.mass.gov/how-to/file-a-small-claim-in-the-boston-municipal-court-district-court-or-housing-court) Source reviewed: April 2026. --- ## Which statute section applies? The approved Massachusetts source for this build cites: - M.G.L. c. 186, section 15B This is the section used throughout the Massachusetts pages on this site. This page stays anchored to that section and the official Massachusetts guidance listed above. --- ## The rules that matter most Once you get past the legal wording, most disputes still come down to a few core rules: - there is a 30-day return and accounting deadline - sworn itemization and supporting written evidence matter if money is withheld - deductions are limited to specific categories - interest and account-handling rules can apply - the paperwork and timeline matter a lot That is the legal backbone behind most of the site. --- ## 1. The deposit cap and related handling rules The approved Massachusetts source says: - Massachusetts generally caps the security deposit at one month's rent - the deposit remains the tenant's property, may not be commingled, and is protected from the lessor's creditors - the deposit generally must be kept in a separate interest-bearing Massachusetts bank account That is one reason the deposit issue matters so much: the money is regulated from the beginning, not just at move-out. --- ## 2. The receipt, account, and statement rules The approved Massachusetts source also says: - a bank receipt identifying the account is generally due within 30 days, and failure can entitle the tenant to immediate return of the deposit - a statement of condition is required upon receipt of the deposit or within 10 days after commencement of the tenancy, whichever is later - annual interest is generally required after one year These technical records can end up deciding the claim. --- ## 3. The return deadline One of the biggest Massachusetts rules is the **30-day** deadline. Under the approved source, the landlord generally must return the security deposit or balance within 30 days after termination of occupancy under a tenancy-at-will or the end of the tenancy as specified in a valid written lease. Read the deadline rule in plain English: [Massachusetts Security Deposit Deadline](/massachusetts/security-deposit-deadline/) --- ## 4. Damage deductions require more than a vague list If money is withheld for damage, Massachusetts requires more than a vague explanation. The approved source says damage deductions require: - a sworn itemized statement under pains and penalties of perjury - supporting written evidence such as estimates, bills, invoices, or receipts That is why weak or incomplete deduction paperwork becomes such a central issue in Massachusetts deposit disputes. See what a landlord can actually deduct: [What Can a Landlord Deduct in MA?](/massachusetts/what-can-landlord-deduct/) --- ## 5. Reasonable wear and tear is not deductible The approved Massachusetts source is explicit on this point. Reasonable wear and tear cannot be charged against the security deposit. That is the line this site uses when it compares actual deductible damage to ordinary turnover. See the wear-and-tear framing: [Normal Wear and Tear in MA](/massachusetts/normal-wear-and-tear/) --- ## 6. Remedy and successor-owner issues The approved Massachusetts source also says: - if the landlord failed to comply with key Massachusetts security-deposit requirements, the landlord can lose the right to retain the deposit - the landlord may face triple-damages exposure plus interest, costs, and reasonable attorney's fees - a successor owner must receive the transferred deposit and accrued interest, and successor notice is generally due within 45 days This does not come up in every dispute, but it is part of the approved source material. --- ## 7. Special-structure issues The approved Massachusetts source also notes: - the statute separately regulates last month's rent and security deposits, and they should not be treated as the same pot of money - Massachusetts now authorizes optional fee-in-lieu arrangements by statute, but ordinary security-deposit rules still govern standard deposits That is why this site keeps the focus on ordinary security deposits and does not mix them with other payment structures. --- ## 8. Why the source material can still feel intimidating If you go straight to the statute section, you will notice what most renters notice: - the wording is dense - the rules are there, but not always easy to apply to a real move-out situation - the timeline and paperwork still have to be organized correctly That is normal. The law gives you the framework, but it usually does not tell you: - what to say first - how long to wait - how to follow up - when the situation is actually strong enough to push harder That is where people tend to get stuck. The practical path is usually: 1. confirm the deadline and possession-delivery facts 2. gather records 3. compare deductions and paperwork to the statute 4. send a clear written demand 5. escalate only if the landlord still does not resolve it --- ## 9. The court-stage source material now linked here The updated Massachusetts source also points to official court resources for the filing stage: - the Mass.gov small claims pages - the small claims forms list - the file-a-small-claim path for the main court departments That does not turn this page into a full filing manual. It does mean the Massachusetts source now gives you an official starting point for the next stage, instead of leaving that part completely open-ended. --- ## 10. Why this page still matters If you want to dig into the law directly, go for it. That is what this page is for. But most deposit disputes are not lost because the cited statute does not exist. They are lost because: - the tenant does not know which rule matters most - the timing is off - the documentation is weak - the communication is unclear So there are really two levels here: ### Level 1: Source material You read the cited section and approved source notes yourself. ### Level 2: Practical use You figure out how to apply that material in the right order, with the right timing, and with enough documentation to make it matter. That second part is usually harder than just finding the law. --- ## If the landlord did not follow the law If the deadline was missed, the deductions were weak, or the deposit was not returned properly, your next step is usually not more reading. It is taking the law you already have and using it. Start here: - [Deposit Not Returned](/massachusetts/deposit-not-returned/) - [Demand Letter](/massachusetts/demand-letter/) - [Evidence](/massachusetts/evidence/) - [Small Claims Guide](/massachusetts/small-claims/) - [Massachusetts Recovery System](/massachusetts/toolkit/) --- ## TL;DR If you want the Massachusetts source material used on this site, start with: - the cited section at M.G.L. c. 186, section 15B - the approved Massachusetts source notes used for this build That is the legal backbone. But most people do not get stuck finding the law. They get stuck turning it into a clean process: - knowing which rule matters first - knowing what to send - knowing when to follow up - knowing when they are actually in a strong position If you want the law, it is above. If you want the law turned into a usable process, that is where the system helps: it takes the documentation, demand, follow-up, and final escalation sequence and puts it in the right order. [/massachusetts/toolkit/](/massachusetts/toolkit/) --- ## Related Pages - [Plain-English Law Overview](/massachusetts/security-deposit-law/) - [Massachusetts Security Deposit Deadline](/massachusetts/security-deposit-deadline/) - [What Can a Landlord Deduct in MA?](/massachusetts/what-can-landlord-deduct/) - [Normal Wear and Tear in MA](/massachusetts/normal-wear-and-tear/) - [Demand Letter](/massachusetts/demand-letter/) - [Small Claims Guide](/massachusetts/small-claims/) --- ## Important This page provides general educational information and is not legal advice. For the official text and court resources, use the Massachusetts links above.