Invoice Due Date Calculator
Add payment terms to an invoice issue date and choose a reminder lead time to get due and reminder dates.
Runs locally in your browser. This tool does not upload your input.
Invoice terms
Results
- Due date
- 2026-08-29
- Reminder date
- 2026-08-24
- Days to pay
- 30
How to calculate an invoice due date
Use this calculator to turn issue dates and payment terms into due and reminder dates.
What this tool helps with
It adds payment terms to the issue date and subtracts reminder lead time from the due date.
Inputs to prepare
- Prepare the issue date, payment terms in days, and reminder days before due.
- The result shows due date, reminder date, and total days to pay.
- Check weekends, holidays, and contract wording before sending final payment reminders.
How to use it well
- Start with the sample values, then replace them with your own numbers or text.
- Check the result and adjust assumptions before relying on it.
- Use it as a planning aid, then confirm important outputs in the source system or real-world context.
Privacy
This tool runs locally in your browser. The values you type are used only to update the result on the page.
FAQ
Does it skip weekends?
No. It counts calendar days, which is how many invoice terms are written.
Can I use net 15 or net 30?
Yes. Enter 15, 30, or any other term length in days.
What is the reminder date?
It is the due date minus the number of reminder days you entered.