How long does a landlord have to return a security deposit in Massachusetts?

30 days after move-out (M.G.L. c. 186, s. 15B).

What happens if a Massachusetts landlord returns the deposit late?

Penalty: 3x the amount owed plus interest and attorney fees.

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Massachusetts security deposit rules

30 days

to return your deposit or send an itemized list

3x the amount owed plus interest and attorney fees

possible penalty if they don't follow the rules

What to do to get your deposit back

Photograph every room when you move out (walls, floors, appliances, inside cabinets). Keep your move-in photos too.
Send your forwarding address in writing, with the date.
Mark the deadline: 30 days after you move out.
If it's late or the deductions look wrong, send a written demand letter that cites M.G.L. c. 186, s. 15B.
Still nothing? Small claims court is built for this, and you usually don't need a lawyer.

Let Stoop handle it.

Text Stoop your move-out date. It tracks your Massachusetts deadline, saves your photos, and writes the demand letter if your landlord is late. Free, no app.

Text Stoop or text (855) 254-5250

Law: M.G.L. c. 186, s. 15B. Updated November 2026. General information, not legal advice. Laws change; check the current statute or a local tenant organization for your situation.