Use it before sending a new invoice so the dates are right, or when chasing an overdue payment so the late-fee maths is documented. Pair it with the Date Calculator for complex date math and the Receipt Tax Calculator for the line items.
Calculator
Formula used
Due date = invoice date + term days · Discount = subtotal × discount% if paid within discount days
How to use the Invoice Due Date Calculator
- Pick the invoice date from the calendar.
- Choose the payment terms (Net 15/30/60 or due on receipt).
- Optionally set an early-pay discount and a late-fee rate.
- Read the due date, the early-pay window and any current late fee.
About this tool
The Invoice Due Date Calculator is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- Setting the terms on a new invoice.
- Calculating the late fee on an overdue account.
- Deciding whether to take an early-pay discount.
- Tracking the ageing of accounts receivable.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
What is "2/10 Net 30"?
A 2% discount if the invoice is paid in 10 days, otherwise the full amount is due in 30 days. The discount is annualised to about 36% interest, so most buyers take it.
How is the late fee calculated?
A monthly rate times the days late, divided by 30. Many small businesses use 1-1.5% per month; some state laws cap late fees, so check your local rules.
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