Net 30 due date, and the discount deadline.

Counting to net 30 without a calendar

Net 30 is simple until you need the actual date: which month has 31 days, does a weekend count, and when does the early-payment discount stop? This page does the counting in calendar days, shows the weekday, and flags a due date that lands on a Saturday or Sunday. It also handles the "end of month" version of net terms, which pushes the deadline to a month-end instead of a day count.

If you are weighing whether to take a discount, the 2/10 net 30 calculator turns it into an annual rate. If a payment is already late, use the late fee and interest calculator.

Worked example

An invoice is dated Monday, October 26, 2026 on terms of 2/10 net 30. Ten days later is Thursday, November 5, 2026, the last day for the 2% discount. Thirty days later is Wednesday, November 25, 2026, the due date.

On the end-of-month reading, the same October invoice is due by the end of the following month, Monday, November 30, 2026. A start date of January 15, 2027 on net 30 lands on Sunday, February 14, 2027, so the tool notes that the next business day is Monday, February 15, 2027, if your agreement rolls the date forward.

How it is calculated

Calendar-day terms: due date = start date + N days, counting every day including weekends and holidays; the discount deadline is start date + the discount days. End-of-month reading: the last day of the month after the start date's month. Dates are computed in UTC so daylight-saving changes never shift a day.

Wikipedia says "net 30" indicates that full payment is expected within 30 days, due on or before the 30th calendar day including weekends and holidays, counted from when the goods were dispatched or the service completed; it also describes "net 30, end of the month" as payment expected by the end of the month following the month of the invoice. Because the starting point differs by contract, this page lets you enter whichever date your terms count from.

What this does not cover

• Which date your contract counts from. Check whether it says invoice date, dispatch date, delivery date or date of receipt.
• Public holidays and bank closures. Whether a due date rolls to the next business day depends on the agreement and the payer.
• Other end-of-month variants (for example 30 days after month end). Only the reading described in the source is built in.
• Late fees and interest, covered by the late fee and interest calculator.

Sources

Opened and read on 2026-10-26 (figures and wording as of that date):

• Payment terms, Wikipedia: "net 30" meaning, calendar-day counting including weekends and holidays, the end-of-month construction and the 2% discount window.
• 5 CFR 1315.4, Cornell Legal Information Institute: for US federal agencies, the payment period begins on receipt of a proper invoice and a payment due on a weekend or federal holiday may be made the next business day.