Late fee calculator for overdue invoices.
Work out the late fee on an overdue invoice from the invoice amount, the fee rate in your terms, and the days late. Free, instant, no signup.
Always state late fees in your payment terms before invoicing — a fee the client never agreed to is hard to collect.
Late fee FAQ
How is a late fee calculated on an invoice?
The common approach is a pro-rated annual rate: invoice amount × (annual rate ÷ 365) × days overdue. A 12% annual rate on a $2,400 invoice works out to about $0.79 per day.
Can I charge whatever late fee I want?
No — the fee must be in the payment terms the client agreed to before the invoice, and reasonable for your jurisdiction. Put it in the proposal and on the invoice itself.
Are late fees better than reminders?
Reminders prevent most overdue invoices before fees ever apply. Automated reminder sequences in Workspace369 follow up on a schedule and branch on paid status — the fee is the backup, not the strategy.
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