A client is past due. Enter the invoice and your late-fee terms — flat fee, percentage per month or annual interest — and get the fee, the total now owed, and a polite reminder you can copy and send. Runs in your browser, nothing uploaded.
Late payment is one of the most common freelance headaches, and a late fee — agreed up front in your contract — is the polite, professional way to discourage it. The hard part is usually the arithmetic and the wording: how many days overdue is it, what does that work out to, and how do you ask for it without sounding aggressive? This calculator does both.
Enter the invoice amount and due date, choose how your contract charges late fees, and the tool shows the days overdue (after any grace period), the late fee, and the total now due. It also drafts a short, courteous reminder message with those numbers filled in, ready to copy into an email.
Counts from the due date to today (or a date you pick), minus your grace period.
Flat fee, percentage per month, or an annual interest rate applied over the days overdue.
Invoice amount plus the late fee, in your currency.
A polite, professional message with the amount, days overdue and total — one click to copy.
Set a few days of grace so a fee only applies once it is genuinely overdue.
Runs entirely in your browser. The invoice details never leave your computer.
Late fees work best when they are written into the contract you agreed before starting — which is exactly what ProposalPro helps you set up. Many places also regulate or cap late fees and interest, so treat this as an estimate, not legal advice, and confirm what is enforceable where you are. Once you know the figure, you can reissue the bill with InvoicePro.
Part of a set of offline, no-subscription tools for the whole freelance workflow:
Work out the fee and send a polite nudge in two minutes. Free, no account, nothing uploaded.