Enter invoice details
Amount, due date, as-of or paid date, and your annual late fee interest rate.
Invoice Late Fee Calculator
Enter the invoice amount, due date and payment date to see days late, the fee owed and the total balance, live.
$1,000.00Total amount owed
0Days late
$0.00Late fee
$1,000.00Original amount
How it works
Add a flat fee
Optionally include a fixed late fee your terms charge on top of interest.
See the total instantly
Days late, the fee owed and the full amount due update live as you type.
FAQ
How is the late fee calculated?
The annual interest rate is divided by 365 to get a daily rate, multiplied by the invoice amount and the number of days late, then any flat fee is added on top.
What if the payment date is before the due date?
Days late is floored at zero, so no interest accrues and only a flat fee, if entered, would apply.
What interest rate should I use?
Many businesses use around 18% per year, which is roughly 1.5% per month, but you should use whatever rate is stated in your invoice terms or contract.