Invoice Due Date Calculator

Due date = Invoice date + payment term days. For a Net 30 invoice dated March 1, the due date is March 31 (30 days later).

These are standard payment terms meaning payment is due within 30, 60, or 90 calendar days of the invoice date, respectively — not business days, unless the agreement specifically says so. Net 30 is the most common term in B2B invoicing.

The invoice date itself is day zero — the countdown starts the day after. So a Net 30 invoice dated the 1st is due on the 31st (30 full days later), not the 30th.

Standard invoice terms are based on calendar days, so the due date is whatever calendar date the math lands on — unlike some legal deadlines, invoice terms don't automatically push to the next business day unless your specific agreement says so.

It's an early-payment discount term: pay within 10 days and take a 2% discount, otherwise the full amount is due in 30 days. These terms are common in B2B invoicing as an incentive for early payment — enter your own discount % and discount-period days below if your invoice includes one.