Section 15B(1)(c) bars lease-based interest or penalty for nonpayment until 30 days after the rent became due.
The late-payment timing rule appears inside Massachusetts’ residential security-deposit and rental-payment statute.
Do not invent a statewide percentage or dollar cap from the 30-day timing provision.
The actual rent due date and payment history determine whether the 30-day threshold is relevant.
Start with the actual rent due date
The statutory timing rule runs from when the rent became due. Preserve the executed lease provision stating the due date and compare it with the payment confirmation and ledger posting.
Do not substitute the date a portal generated a fee, sent a reminder or posted a balance for the contractual due date without checking the underlying rent obligation.
Thirty days is a timing restriction, not a percentage formula
Section 15B(1)(c) says a lease or rental agreement may not impose interest or a penalty for failure to pay rent until 30 days after the rent became due. That is a strong timing checkpoint.
The subsection does not itself say that every fee after day 30 is valid, nor does it supply one universal dollar amount or percentage. The lease, exact charge, other applicable rules and facts still matter.
Separate ordinary rent late fees from other payment charges
A card-processing charge, returned-payment fee or other payment-method charge can arise for a different reason than failure to pay rent on time. Do not automatically apply the 30-day late-payment penalty rule to a differently triggered line item without identifying what the charge actually represents.
Partial payments still require a ledger reconstruction
If part of the rent was paid before the late charge appeared, preserve the running ledger balance and every payment or credit. The 30-day statute is about timing, while the amount calculation may depend on the lease and other law.
Use the Late Fee Calculator only to model the formula actually stated in your documents. Do not preload a Massachusetts percentage because § 15B(1)(c) does not provide one.
Documents to compare
- Executed lease showing the rent due date and any late-payment term.
- Resident ledger showing the original rent charge, payments, credits and late-fee posting date.
- Payment confirmations or bank records.
- Any partial-payment history.
- Notice describing the exact fee or penalty and its calculation.
- Returned-payment or payment-processing records if the disputed line is not an ordinary rent late fee.