CALC
Freelancer Tools
Late Payment Fee Calculator
Calculate late fees on overdue invoices with flat or monthly percentage rates.
Private Instant
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About the Late Payment Fee Calculator
Late fees only work if your contract allows them and local law permits. This calculator helps you quantify what is owed so you can follow up professionally.
Pick flat or monthly percentage, enter due date and amount, and see the updated balance.
How to calculate a late fee
- Enter invoice amount and due date.
- Choose flat fee or % per month.
- Read days overdue, fee, and new total.
Frequently asked questions
Is a late fee always enforceable?
It depends on your contract and local rules. Check before charging.
How do I put this in a contract?
Use the Freelance Contract Generator and set a late payment fee percentage.