Late Fee Calculator

A late fee is a charge added to an unpaid invoice after the payment due date has passed. It compensates the invoice issuer for the delay and incentivizes timely payment. Late fees can be a flat amount or a percentage of the invoice total.

Yes, many jurisdictions cap the interest rate you can charge on overdue invoices. In the US, limits vary by state - typically between 1% and 1.5% per month (12-18% annually). Always check your local regulations and clearly state your late fee policy on invoices.

Simple interest is calculated only on the original principal amount. Compound interest is calculated on the principal plus any previously accumulated interest. For short overdue periods, the difference is small, but compound interest grows faster over longer periods.

Most businesses apply a grace period of 7-15 days after the due date before charging late fees. Your payment terms should clearly state when late fees begin accruing. Common terms include "Net 30" (due in 30 days) with interest starting on day 31.

Include your late fee policy in your payment terms on every invoice. When a payment is overdue, send a reminder with the calculated late fee. With Invoice My Clients, you can automate late fee calculations using our compounding interest feature.