Net 28 Calculator: Due Date for 28-Day Payment Terms

Also written as: 28 days · 28 days net · payment within 28 days · Net 28 days

EOM rows start counting when the invoice month ends (method 1); the EOM guide shows the second reading. Dates are calendar arithmetic: weekends and holidays are not skipped.

Replace [due date] with the date from the calculator.

due date = invoice date + 28 calendar days. The day after the invoice date is day 1, and day 28 is the due date: the last day to pay on time, unless the contract says otherwise. 28 days is exactly 4 weeks, so the due date always falls on the same weekday as the invoice date.

This is date arithmetic only. Where a law sets its own payment period, it can count from a different event; the rules we have verified are quoted in the payment terms guide.

Late interest in the calculator is simple interest: amount × yearly rate × days late ÷ 365, where the days late are the days after the due date up to and including today. It is arithmetic on the rate you enter, not a statement that the rate is allowed.