Invoice Due Date Calculator
Enter the invoice date and your payment terms — Net 15, 30, 45, 60, 90, or a custom number of days — to get the exact due date and see whether the invoice is on track or overdue.
How the invoice due date calculator works
“Net 30” means payment is due 30 calendar days after the invoice date — not 30 business days, unless your contract says otherwise. This calculator adds the term length to the invoice date and compares the result with today, so you instantly see the due date plus how many days remain or how many days overdue the invoice is.
Choose a custom term when your agreement uses something unusual, like Net 21 or 2/10 Net 30. The date math handles month and year boundaries automatically, including leap years.
due = invoice date + terms · status: days until due (negative = overdue)
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Invoice due date calculator FAQ
What does “Net 30” mean on an invoice?
Net 30 means the full payment is due 30 calendar days after the invoice date. Net 15, Net 60, and Net 90 work the same way with different day counts.
Are payment terms counted in business days?
Usually calendar days, unless the contract explicitly says business days. When in doubt, check the agreement — this calculator uses calendar days.
What does 2/10 Net 30 mean?
It offers a 2% discount if paid within 10 days, otherwise the full amount is due in 30 days. For the due date itself, use Net 30 in the calculator.
What happens if an invoice is overdue?
Many contracts add late fees or interest after the due date, and chronic late payment can damage supplier relationships. The calculator flags overdue invoices so you can act fast.
How do I count the days — is the invoice date day 0 or day 1?
Standard practice counts the invoice date as day 0, so a Net 30 invoice dated March 1 is due March 31. This calculator follows that convention.