Late fee calculator
How much are you owed for late payment?
Enter the invoice amount, number of days overdue, and your late fee rate. Get the exact penalty to add to your follow-up invoice — and the text to include in your payment terms.
Invoice details
Late fee charged
$14.79
Original invoice
$1,000.00
Total now owed
$1,014.79
Calculation breakdown
Annual rate (equivalent)18.00%
Daily rate0.049315%
Days overdue30 days
Formula$1,000.00 × 0.049315% × 30
Pro tip: Add late fee terms to every invoice
Include "A late fee of 1.5% per monthly will be applied to overdue balances" in your invoice payment terms. This alone reduces average payment time by 18 days.