Free Calculator
Invoice Late Fee Calculator
Calculate the late fee owed on an overdue invoice based on days past due and interest rate.
Enter invoice details
$
The original unpaid invoice amount
Number of days past the due date
%
Common range: 1.5%/month (18% APR) for US businesses
Formula
Late Fee = Amount × (Annual Rate ÷ 365) × Days
Results
Enter invoice details to calculate the late fee
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