How to Write a Late Fee Policy That Actually Works
Late fees only work when they are predictable, disclosed, and applied consistently. A policy that lives only in your head is unenforceable and tends to feel arbitrary to customers — which is the opposite of what late fees are supposed to do.
Pick a rate and grace period. The most common late-fee structure in U.S. small business is 1.5% per month (18% annualized) after a 10-day grace period. Some states cap the maximum rate — check your state's usury law before committing to a higher figure.
Disclose, disclose, disclose. The fee must appear in three places: on the signed estimate, on the invoice itself (footer is fine), and in any written agreement or terms-of-service document. If you cannot point a customer at where the fee was disclosed in writing before they hired you, you cannot enforce it.
Example late-fee clauses. Short version (invoice footer): 'Payment is due within 15 days. A late fee of 1.5% per month will be applied to balances unpaid after a 10-day grace period.'
Frequently asked questions
How much can I legally charge as a late fee?
Most states allow up to 1.5% per month (18% annualized). Some states cap it lower. Check your state's usury statute or consult a small-business attorney before exceeding 1.5%.
Can I charge a flat late fee instead of a percentage?
Yes — a flat fee (e.g., '$25 late fee after 10 days') is legal and easier for customers to understand. It works best on smaller invoices where 1.5% would be trivial.
Do I have to charge the late fee every month or just once?
Compounding monthly late fees are legal if disclosed, but many small businesses charge a single late fee to keep things simple and preserve relationships.
