Net 30 Invoice Due Date
Compute due dates for Net 15 / 30 / 60 / 90 invoices.
Written and maintained by Paul Clark, Redmoon Software · Rules last verified · Sources
These calculators are for informational purposes only and do not constitute legal, financial, or professional advice.
How the Net 30 Invoice Due Date works
The Net 30 Invoice Due Date calculator turns a start date and a payment term — Net 15, 30, 60, or 90 — into an exact due date. Net terms are counted in calendar days, so the tool simply needs the day the clock starts and the number of days in the term.
The ambiguity in Net 30 is never the 30; it is day zero. Invoice date, date of receipt, and delivery date can differ by days, and each shifts the due date. Agree on the start date up front and the due date stops being a point of dispute.
Worked example
An invoice dated May 2 on Net 30 terms is due May 32 — which does not exist, so the due date rolls to June 1. The calculator does that month-boundary arithmetic for you and shows the exact date.
Frequently asked questions
Is Net 30 counted in business days or calendar days?
Calendar days, in almost all cases. Net 30 means 30 calendar days from the agreed start date, so weekends and holidays are included in the count. The raw date can therefore land on a weekend — and by default the calculator does not leave it there: the "Roll non-business due dates forward" box is ticked, so a due date falling on a Saturday, Sunday, or a holiday on your selected calendar is moved to the next business day. Untick it when your contract wants the raw calendar date rather than the next day anyone is at a desk.
What date does the term start from?
Whatever your agreement specifies — most commonly the invoice date, but sometimes the date the invoice is received or the goods are delivered. The calculator lets you set that start date explicitly.
Does it support Net 15, 60, and 90?
Yes. Choose any common net term and the due date is computed the same way.
What happens if the due date lands on a weekend?
By default the calculator rolls it forward to the next business day, because that is what accounts-payable runs do in practice. Untick "roll non-business due dates forward" if your contract wants the raw calendar date. The distinction matters most for late-payment interest, which usually runs from the contractual date rather than the day someone was next at a desk.
Is Net 30 the same as one month?
No, and the gap is widest at month end. Thirty days from 31 January is 2 March in an ordinary year; one month from 31 January is 28 February. Contracts that use the two phrases interchangeably have built in a two-day ambiguity that only surfaces in February.
What this calculator does not do
A limitation you know about costs far less than one you find after the deadline. These are the specific things this tool cannot work out for you.
- Net terms are a contract term, not a law, for ordinary commercial invoices. The statutes above set defaults where nothing was agreed or where a public body is paying.
- Day zero is the ambiguity, not the 30. Invoice date, receipt date and delivery date can differ by days and each shifts the due date.
Where these rules come from
The periods this calculator applies are taken from the primary sources below rather than from secondary summaries. Verify against them before relying on a date that matters.
- UK — Late Payment of Commercial Debts (Interest) Act 1998
Where no term is agreed, sets a default payment period and a statutory interest entitlement.
- US — Prompt Payment Act, 5 CFR Part 1315
The 30-day rule that applies to US federal agency payments.
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