Net 30 means the full amount of an invoice is due within 30 days of a stated start date, usually the invoice date. It is a widely used payment term in business trade, and most arguments about it come back to a question the invoice did not answer: 30 days from when, and counted how?
Updated September 2026. General information, not tax or legal advice. Rules vary by country.
What net 30 means, and the common variations
- Net 30: the whole balance is due 30 days after the invoice date, unless the terms name a different start.
- Net 30 EOM: 30 days after the end of the month in which the invoice was issued.
- 2/10 net 30: the buyer may deduct 2 percent if they pay within 10 days, otherwise the full amount is due by day 30.
- Net 60 or net 90: the same idea over a longer period.
- Due on receipt: payment is expected immediately.
“Net” refers to the amount after any agreed deductions. It does not mean net of tax.
How to calculate the due date
Count calendar days, not working days, unless your contract says otherwise. The EU Late Payment Directive, for example, expresses its periods in calendar days. Some illustrative dates:
- Invoice dated 15 September 2026, 30 day terms: due 15 October 2026.
- Invoice dated 31 January 2027, 30 day terms: due 2 March 2027, because February 2027 has 28 days.
- Invoice dated 15 September 2026, 30 days end of month: count from 30 September, so due 30 October 2026.
Month lengths make mental arithmetic unreliable. Our date difference calculator gives the exact date, and our guides to counting the days between two dates and counting working days explain the difference between the two methods.
Is the early payment discount worth taking?
An invented example: on a 5,000 invoice offering 2 percent off for payment within 10 days, paying by day 10 costs 4,900. The buyer saves 100 for paying 20 days sooner. Worked out over a year, that is roughly equal to a 37 percent annual return (2 divided by 98, multiplied by 365 divided by 20), which is why buyers with spare cash usually take it, and why sellers should offer it only when faster cash is worth that much to them.
What the law adds to 30 day terms
United States
Private businesses set payment terms by contract. For federal contracts, FAR 52.232-25 makes payment due on the 30th day after the billing office receives a proper invoice or after the government accepts the goods or services, whichever is later. The Bureau of the Fiscal Service sets the interest rate for late federal payments at 4.75 percent for 1 July to 31 December 2026.
United Kingdom
GOV.UK guidance says that where no payment date is agreed, a payment becomes late 30 days after the customer receives the invoice or the goods or service are delivered. Agreed terms should usually be no longer than 60 days between businesses and 30 days for public authorities. Statutory interest runs at 8 percent above the Bank of England base rate. In May 2026 the government introduced the Commercial Payments Bill, which would cap payment terms at 60 days with limited exemptions and make that interest mandatory. It is not yet in force, and the government has said businesses will get a lead-in period.
An illustrative calculation: a 4,000 invoice paid 20 days late, assuming for the sake of the example a base rate of 4 percent, attracts 12 percent a year, or about 26.30. Check the current base rate before charging.
European Union
Directive 2011/7/EU limits payment periods between businesses to 60 calendar days unless expressly agreed and not grossly unfair to the creditor, and sets 30 days for most public authorities. Where no date is fixed, interest can be claimed after 30 days. Statutory interest is the reference rate plus at least 8 percentage points, and the creditor is entitled to a fixed 40 euros for recovery costs. Each member state writes these into its own law, so check the national version.
5 mistakes that delay payment on 30 day terms
- Not stating the start date. Write “payment due within 30 days of the invoice date” and print the actual due date on the invoice.
- Leaving out the buyer’s reference. Many finance teams will not pay an invoice that does not quote their purchase order. See purchase order vs invoice.
- Sending the invoice late. Under the UK default rule and FAR 52.232-25 the clock starts on receipt, so a week spent drafting is a week added.
- Not mentioning late payment terms. State that interest applies under the relevant law or your contract. It sets expectations before anything is overdue.
- Waiting until day 31 to follow up. A short reminder a few days before the due date catches lost invoices while there is still time.
A clean invoice number and complete details matter too. Our invoice generator lets you set payment terms and a due date on every invoice.
Are 30 day terms right for your business?
Net 30 suits repeat customers with a record of paying on time and orders large enough that invoicing on account is normal. For new customers, one-off jobs or thin margins, a deposit or shorter terms are reasonable, and nothing in the rules above obliges you to offer 30 days. Whatever you choose, agree it before the work starts and repeat it on the invoice.
Wording to put on the invoice
Clear wording settles most questions before they are asked. A short block near the total works well, for example: payment terms 30 days from invoice date, due date 15 October 2026, interest may be charged on late payments under applicable law, and the invoice number to quote as the payment reference. Put the same terms in your quote or contract, so the invoice repeats something already agreed rather than introducing it for the first time. If a customer later asks for longer terms, agree the change in writing and update the due date on the next invoice, rather than leaving an old date and a new promise side by side.
Common questions
What does net 30 mean on an invoice? The full invoice amount is due within 30 days, normally counted from the invoice date. The invoice should say which date the 30 days run from.
Does net 30 include weekends and holidays? Usually yes. Net terms are normally read as calendar days unless the contract says working days, and EU late payment rules use calendar days.
What does 2/10 net 30 mean? The buyer can take a 2 percent discount by paying within 10 days. Otherwise the full amount is due within 30 days.
Can I charge interest if an invoice is paid late? In the UK and EU, statutory interest is available on late business payments, and US federal agencies pay Prompt Payment interest. Elsewhere it depends on your contract and local law.
Sources and further reading
Where the figures and rules above come from, so you can check them:
- Prompt payment due dates and proper invoice contents, FAR 52.232-25: Acquisition.gov
- Prompt Payment interest rate: US Bureau of the Fiscal Service
- Default and maximum payment terms in the UK: GOV.UK
- Statutory interest on late commercial payments: GOV.UK
- Commercial Payments Bill overview: GOV.UK
- EU Late Payment Directive 2011/7/EU: EUR-Lex
Photo credits: Today is a new day (51444105751) by Infrogmation of New Orleans from New Orleans, CC BY 2.0, via Wikimedia Commons. Paying with a Credit Card (28886645201) by Hloom Templates, CC BY 2.0, via Wikimedia Commons.
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