Invoice Due Date Calculator
Convert Net 7, Net 15, Net 30, or custom payment terms into actual due dates.
Payment dates
Formula
Due Date = Invoice Date + Payment Terms Days
Follow-up Date = Due Date + Grace Days How the formula works
The calculator adds the payment terms days to the invoice date to create the due date. It then adds optional grace days to show when follow-up can begin.
It uses calendar days. If your contract says business days, excludes holidays, or starts from receipt instead of invoice date, adjust the input date or terms to match the agreement.
Complete example
An invoice is dated June 4, 2026. The payment term is Net 30, and the business waits 3 grace days before sending a late follow-up.
- Invoice date: June 4, 2026
- Payment terms: 30 calendar days
- Due date: July 4, 2026
- Grace days: 3
- Follow-up after: July 7, 2026
The due date is still July 4. The grace date is only a follow-up planning date.
Read invoice payment terms explained for practical wording and reminders.
When to use this calculator
- Convert Net 7, Net 15, Net 30, or custom terms into an actual date.
- Plan payment reminders and follow-up dates.
- Check due dates before sending an invoice to a client.
- Keep invoice terms consistent across simple freelance or small business invoices.
How to interpret the results
The due date is the payment deadline produced from the invoice date and terms. The follow-up date is the date after any grace days, which can be used for reminders or internal tracking.
If the due date lands on a weekend or holiday and your agreement requires business-day handling, adjust the date manually according to the agreement.
Common mistakes
- Using Net 30 but forgetting whether the count starts from invoice date, receipt date, or approval date.
- Treating grace days as an extension of the legal or contractual due date.
- Assuming calendar days and business days are the same.
- Sending invoices without a visible due date or payment terms.
- Changing terms after sending an invoice without written agreement.
Related tools
- Invoice Generator: create a printable invoice with the calculated due date.
- Invoice Terms Explained: compare common invoice terms and wording.
- Invoice Payment Terms: choose practical payment terms and reminders.
- Freelance Rate Calculator: set a rate before creating an invoice.
FAQ
What does Net 30 mean?
Net 30 means payment is due 30 calendar days after the invoice date unless the contract says otherwise.
Should due dates use business days or calendar days?
Most simple payment terms use calendar days, but contracts can define business-day terms. Use the method stated in your agreement.
Can I use this with the invoice generator?
Yes. Calculate the due date here, then use it in the invoice generator.
What is a grace day?
A grace day is an extra day after the due date before you follow up, mark the invoice late, or send a reminder. It is not the same as changing the actual due date.
Does this account for weekends or holidays?
No. This simple calculator adds calendar days. If your agreement uses business days or excludes holidays, apply those terms separately.
What does due on receipt mean?
Due on receipt usually means payment is expected when the invoice is received. In the calculator, use 0 payment terms days for this case.
Can payment terms be different from the invoice date?
Yes. Some contracts define terms from delivery, approval, statement date, or receipt date. Use the date your agreement defines as the start date.
Disclaimer
This calculator is for general invoice planning. It does not replace contract, accounting, tax, payment, or legal advice.