If you rented in Massachusetts and your landlord is holding your security deposit, you're in the most tenant-protective deposit jurisdiction in America. Section 15B is a procedural minefield for landlords — separate escrow accounts, sworn itemizations, statement-of-condition requirements — and the penalty for the key violations isn't discretionary: it's treble damages plus interest, costs, and attorney's fees. Most Massachusetts landlords who mishandle a deposit have violated the statute several ways before you've written a word.
⚖️ The 30-day rule: Under § 15B, your landlord must return your deposit — with interest — within 30 days of the end of your tenancy. Any deduction requires an itemized list of damages signed under the pains and penalties of perjury, backed by written evidence: invoices, bills, receipts, or repair estimates. A casual list of charges doesn't satisfy the statute.
💰 The penalty that gets attention: For the violations specified in § 15B(6)–(7) — including failing to return the deposit within 30 days — the landlord is liable for three times the deposit, plus 5% interest, court costs, and reasonable attorney's fees. Massachusetts courts apply this strictly; good intentions are not a defense.
Your Rights Under M.G.L. c. 186, § 15B
The statute regulates the deposit from the day it's collected. Each requirement below is a potential violation your letter can cite:
- One month's rent cap. The deposit can never exceed your first month's rent.
- Separate Massachusetts escrow account. Within 30 days of receipt, the deposit must sit in a separate, interest-bearing account in a Massachusetts bank, shielded from the landlord's creditors — and you're entitled to a receipt with the bank's name, location, and account number.
- Statement of condition. Landlords taking a deposit must provide a signed statement of condition at move-in; deductions for damage identified at move-in are barred.
- The 30-day return + sworn itemization. Return everything within 30 days of the tenancy ending, or deduct only with a perjury-sworn, evidence-backed itemized list delivered in that window.
- No wear-and-tear deductions, ever. The Supreme Judicial Court confirmed in 2025 (Peebles v. JRK Property Holdings) that § 15B does not permit deductions for reasonable wear and tear — including routine cleaning and repainting charges dressed up as damage.
- Annual interest. You're owed interest on the deposit each year of the tenancy — unpaid interest is itself a violation.
What Your Landlord Can — and Can't — Keep
Legitimate deductions (with full statutory compliance)
- Unpaid rent
- Unpaid water charges or real estate taxes you validly owe under the lease
- Documented damage beyond reasonable wear and tear — with the sworn itemization and written evidence § 15B(4) requires
NOT legitimate deductions
- Anything deducted without the perjury-sworn itemized list and evidence inside 30 days
- Reasonable wear and tear of any kind — scuffs, nail holes, worn carpet, routine cleaning or repainting
- Damage noted on the move-in statement of condition
- Deductions from a deposit that was never properly escrowed or receipted — handling violations can entitle you to the full deposit back regardless of damage
How the Massachusetts Penalty Actually Adds Up
Suppose your deposit was $2,000 and your landlord missed the 30-day deadline:
| Component | Amount |
|---|---|
| Treble damages (3× the deposit) | $6,000 |
| 5% interest | As accrued |
| Court costs + reasonable attorney's fees | As awarded |
| Landlord's exposure | $6,000+ and fees |
And there's a second lever: violating § 15B is also an unfair practice under Chapter 93A, the Massachusetts consumer protection law — which itself carries multiple damages and requires a written 30-day demand letter before suit. In Massachusetts, the demand letter isn't just persuasive; it's the statutory key that unlocks your strongest claims.
How to Write a Massachusetts Security Deposit Demand Letter
An effective letter establishes the tenancy-end date, identifies each § 15B violation (missed deadline, no sworn itemization, escrow failures, unpaid interest), makes a specific dollar demand with a deadline, and invokes the treble-damages and 93A exposure. Here's how the opening of a strong one reads:
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Generate My Refund Letter — $9If the Letter Doesn't Work: Small Claims or Housing Court
Small claims / Housing Court
Massachusetts small claims handles deposit cases up to $7,000 — and because treble damages and attorney's fees are statutory, lawyers will often take stronger § 15B cases even at small dollar amounts. Housing Court is another tenant-friendly venue in most of the state. Your demand letter is Exhibit A — and for the 93A claim, it's a prerequisite.
Free tenant resources
MassLegalHelp publishes the definitive free guide to § 15B, and Greater Boston Legal Services and regional legal aid offices advise tenants at no cost. A search for "Massachusetts security deposit legal aid" will point you to them.
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Get My Refund Letter — $9Already hearing from a collection agency?
Landlords hand move-out balances to a small set of specialist collectors. If the letter is from National Credit Systems, Hunter Warfield, IQ Data International, or Source RM, we have a company-specific response guide for each — and the demand letter on this page still applies, because a landlord who missed the statutory deadline may owe you money regardless of who is calling. Any other collector: see the collection agency index and your state’s rules in the debt statute of limitations guide.