New Mexico late fee and interest rules for invoices

Here is what New Mexico law says about late fees and interest on unpaid invoices, for business clients and consumers, with the statute and a link to the official source.

This is general information, not legal advice. Laws change and can apply differently to your situation, so check your state's current law or ask a lawyer before you charge a late fee, interest or a deposit. Last reviewed October 21, 2026.

New Mexico late fee and interest limits

Rule	New Mexico
Business-to-business late fee or interest cap	Interest may not go over 15% a year unless a higher rate is agreed in writing. On an open account, it starts 30 days after the last delivery.
Consumer cap	No specific limit found for invoices to individuals. Keep the fee reasonable and agreed in writing.
Legal interest rate when no rate was agreed	Up to 15% a year on money due by contract. Judgments carry 8.75% a year.
Statute	NMSA 1978 §§ 56-8-3, 56-8-4, 56-8-5
Last reviewed	October 21, 2026

Late fee wording to copy

Agree on the fee before the work starts and show it on every invoice.

Payment is due within 30 days of the invoice date. Balances unpaid after the due date are charged interest of [rate]% per month.
A late fee of $[amount] applies to any balance not paid by the due date.
Past due balances accrue interest at [rate]% per year, or the highest rate allowed by law, whichever is lower.

Keep going

Late fee calculatorWork out the fee or interest on an overdue invoice.How to charge late feesHow to set a late fee and put it on your invoices.Late fee laws by stateEvery state in one table.