New Hampshire Late Rent Fees (No Statutory Cap)

No provision of RSA chapter 540 or 540-A sets a maximum late fee or a mandatory grace period for residential rent in New Hampshire, so there is no statutory requirement on the amount. A late fee must be agreed to in the written lease to be charged at all. Because New Hampshire courts treat penalty clauses skeptically, a late fee should be a reasonable estimate of the landlord's actual damages; an excessive fee functioning as a penalty may be unenforceable. Late fees may not be collected through self-help measures barred by RSA 540-A:3, such as utility shutoffs or lockouts. Any fee dispute is resolved under general contract principles rather than a dedicated late-fee statute.

No specific statutory penalty. An unreasonable or undisclosed late fee may be unenforceable under general contract law; using prohibited self-help (lockout or utility shutoff) to collect violates RSA 540-A:3.