About the Invoice Due Date Calculator
Due date for payment terms like Net 15, Net 30 or Net 60, and the early-payment discount deadline (e.g. 2/10 Net 30).
Also known as: net 30 calculator, payment terms, due date calculator, 2/10 net 30.
How to use this calculator
- Enter invoice date, net days, early payment days (optional), early payment discount and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
Due = invoice date + net days
Worked example
Using the values pre-filled in the calculator above:
- Invoice date: 2026-09-22
- Net days = 30
- Early payment days (optional) = 10
- Early payment discount = 2 %
- Invoice amount = 5,000
the calculator returns:
- Due date: Thursday, October 22, 2026
- Discount deadline: Friday, October 2, 2026
- Pay if early: 4,900
- Annualized value of discount: 37.24%