Massachusetts Security Deposit Interest Calculator
M.G.L. c. 186 §15B · General information, not legal advice
Calculate the statutory interest that applies to a Massachusetts security deposit under §15B, then check six of the statute's other requirements against your actual practice. Nothing you type here leaves your browser — the only thing this page sends anywhere is your email, and only if you ask it to.
Deposit interest calculator
Enter a deposit amount and tenancy start date to calculate the statutory interest.
Six-question §15B scorecard
0 of 6 match what the statute describes
Is the deposit held in a separate, interest-bearing account in a Massachusetts bank?
Did the tenant receive a receipt naming the bank and account number within 30 days of the deposit?
Was a statement of condition given to the tenant within 10 days of tenancy start (or of receiving the deposit)?
Is interest paid or credited to the tenant each year on the tenancy anniversary?
Is the security deposit no more than one month’s rent?
If you collected last month’s rent in advance, is it also earning interest for the tenant?
This checked what you told us — the $199 Reconciliation Audit checks your actual documents: your lease terms against your bank and card statements, every finding cited to its source page.
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This calculator is general information, not legal advice, and statutes change. For decisions about a specific lease or tenancy, review the current statute and consult a Massachusetts landlord-tenant attorney.