Tenvale

Free MA landlord tool

Massachusetts Late Rent Fee Calculator

Under M.G.L. c.186 §15B(1)(c), no lease may impose any interest or penalty for late rent until 30 days after the rent was due. Enter your lease terms to see whether a late fee is lawful yet — and what the lawful amount is. Updates as you type.

Your rent & lease terms

Result

Days late
0

Whole days past the due date

Late fee status
Not yet lawful

Under §15B(1)(c) — at 30 days late

Lawful late fee
$0.00

No fee is lawful yet

Days until a fee is lawful
31

Days remaining until day 31

How this is calculated

Statutory floor. No late fee or interest is lawful until 30 days after the rent was due. The first lawful day to charge a fee is day 31 — daysLate > 30.

Fee formulas. A flat fee is the lease amount; a percentage fee is rent × rate ÷ 100; a per-day fee accrues only after the floor — dailyFee × (daysLate − 30).

Statutory basis. M.G.L. c.186 §15B(1)(c) provides that “no lease or other rental agreement shall impose any interest or penalty for failure to pay rent until thirty days after such rent shall have been due.” A lease may set a shorter internal grace period, but no late fee or interest is lawful until 30 days after the rent was due.

Tenvale tracks this automatically

Rent due dates, the 30-day statutory clock, and lawful late fees stay in sync — so you never charge a fee before it’s allowed.

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