Late payment fees on invoices: what you can charge and how

A late fee on an invoice does two different jobs, and it pays to know which one you're hiring it for. As revenue it is trivial — 1.5% of an overdue invoice buys a coffee. As queue position it is powerful: when a client's accounts team decides which invoices to pay this run, the ones that get more expensive next week move up.

The one condition that makes a fee enforceable

The client must have agreed to it before the invoice was late — in the contract, on the quote, or on the invoice itself from day one. A fee that first appears on an overdue reminder was never agreed: clients ignore it, courts side with them, and the relationship reads it as retaliation. One sentence does the job: "Overdue balances accrue 1.5% per month from the due date."

What to charge

• 1–2% per month (18–24% annualized) is the common commercial range for freelancers and small businesses.
• A flat fee (say, $25 or ₹2,000 after 14 days) is simpler to apply on small invoices, where percentages produce absurdly small numbers.
• Statutory rates exist in many places: the EU and UK give B2B creditors interest at several points above the base rate plus recovery costs, without any clause at all. In India, registered MSMEs get powerful protection under the MSMED Act — payment due within 45 days and compound interest at three times the bank rate — worth knowing if you have Udyam registration.
• Some jurisdictions cap enforceable interest — if your clause exceeds a local cap, the cap is what you can collect.

How to apply it without a fight

1. Warn before it starts: in the reminder just before the fee kicks in — "per our terms, a 1.5% monthly late fee applies from the 15th" — so the fee is expected, not discovered.
2. Invoice it as its own labelled line ("Late payment fee — INV-042, 30 days overdue"), either on a revised invoice or the next one. Never silently inflate the original total.
3. Apply it exactly as written. The clause you enforce inconsistently is the clause that stops working — clients learn which threats are real.

When to waive it

Waiving is fine — silently waiving is the mistake. A first offence from a good client is worth the goodwill of "the late fee applies from this month, but I'm waiving it this once": the deterrent survives, the relationship improves, and the precedent is explicitly a favour rather than the policy. The fee also isn't your only lever — the escalation sequence in the follow-up timeline and the wording in the reminder templates do most of the work before a fee ever accrues.

Put the clause on the invoice today

The free invoice generator has a terms field on every invoice — one sentence there, and every future overdue conversation starts from policy instead of improvisation.

General information, not legal advice — enforceability and rates vary by jurisdiction and contract. Confirm specifics with a professional.