Invoice Late Fee Calculator
When a customer pays late, a fee written into your terms can add up. This works out the fee from the days late, so you can see the figure before you send a reminder. Whether a fee is allowed depends on your contract and local rules, so check them first.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Count the days past the due date, then take off any grace days. Round the remaining days up to whole months, where any part of a month counts as a full month. The fee is the invoice amount times the monthly rate, times the number of months. The total is the invoice plus the fee.
Worked example
A $2,500.00 invoice, 35 days past the grace period, carries a fee of $75.00, so the total owed is $2,575.00.
Questions
Are late fees allowed everywhere?
It depends on where you are and what your contract says. Some places limit how much can be charged, so check the rules before you add a fee.
Is the fee charged once or every month?
This calculator charges it per month, counting any part of a month as a full month. Change the rate or grace days to match your terms.
How do I show the fee on a reminder?
Show the invoice amount, the fee and the total together, along with the date the fee starts. Clear numbers help avoid disputes.
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