📆 Invoice Payment Terms Calculator

Enter the invoice date and payment terms to get the exact due date and days remaining until it's due.

Invoice Date

Payment Terms

Custom Days

How the due date is worked out

The term you pick is a number of days, and that number is added straight to the invoice date:

due date       = invoice date + term in days
days remaining = round up((due date - now) / one day)

An invoice dated 15 March 2026 on Net 30 is due 14 April 2026. Net 60 on an invoice dated 31 January 2026 lands on 1 April, because the count runs through a short February and does not stop at a month end. Due on Receipt is stored as zero days, so the due date equals the invoice date. Choosing Custom days reveals a box that accepts any whole number from 0 upwards.

What the terms mean in practice

Net 15 suits small jobs and new clients. Net 30 is the default almost everywhere. Net 60 and Net 90 are usually imposed by large buyers, not negotiated.
The clock starts on the invoice date shown here. Plenty of companies start theirs when the invoice is received, approved, or at the end of the month it arrived in, which can add two or three weeks to the real wait.
Once the due date has passed the result turns red and counts the days overdue.

These are calendar days, not business days. A Net 30 invoice dated on a Friday falls due on a Sunday, and the payment run that clears it will be the following week. If the exact day matters, count back and invoice a couple of days earlier rather than arguing about it later.

Frequently asked questions

What does Net 30 mean on an invoice?

The full amount is due 30 days after the invoice date. It does not mean 30 business days, and it does not mean the 30th of next month. Write the due date on the invoice so there is nothing to interpret.

Does Net 30 include weekends and holidays?

Yes. Every one of the 30 days counts, which is why a term of 30 days is closer to 21 working days. Terms that fall due on a weekend are usually settled on the next working day.

What does 2/10 Net 30 mean?

Take 2% off if you pay within 10 days, otherwise the full amount is due on day 30. For the payer, skipping a 2% discount to hold the cash 20 days longer works out at roughly 37% a year, so it is rarely worth it.