Invoice Late Fee Calculator

Instantly calculate late fees, penalties & total amounts due for overdue US invoices. Professional-grade for bookkeepers and small business owners.

1
Invoice Details
Leave empty to calculate as of today
2
Late Fee Terms
US standard is 1.5% per month (18% APR)
Days after due date before fees begin
3
Results
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Fill in the invoice details on the left and click Calculate Late Fees to see the breakdown here.
Late Payment Tips for US Small Businesses
TIP 01
Always state your late fee policy clearly on every invoice — ideally "1.5% per month on overdue balances" — before work begins.
TIP 02
Most US states allow up to 18% APR (1.5%/month). Check your state's usury laws before charging higher rates.
TIP 03
Send an automated reminder at Net-30, Net-45, and Net-60 to reduce the number of invoices that go to collections.