What Is Net 90? Payment Terms Explained

Net 90 means the full invoice amount is due within 90 days. That is 30 days past the 60-day line European and UK late-payment law draw for terms agreed between businesses, so it is a term the law does not simply accept as written. In the EU and the UK it has to survive a "grossly unfair" test; in Spain it cannot be agreed between businesses at all; with a public-sector buyer it is longer than any period the Directive allows.

This guide explains what that fairness test looks at, how instalments can shorten the wait, what the creditor can claim once a Net 90 invoice is overdue, and what a quarter of float costs the seller.

How Net 90 is dated

Ninety days of credit on the full invoice amount: an invoice dated Wednesday, April 1, 2026 on Net 90 terms reaches day 90 on Tuesday, June 30, 2026, a working day in the US, UK, German and Spanish calendars.

Ninety calendar days are 12 weeks and 6 days. They are not three months: three calendar months run from 89 to 92 days depending on which months they cover, so "90 days" and "three months" give different dates on most invoices. The Net 90 calculator dates the term from any invoice date.

Read as business days on a Monday-to-Friday week, the term stretches by more than a month. Ninety working days are eighteen five-day weeks: 126 days on the calendar counted from a working day, and never fewer than 124, before holidays. From April 1, 2026, the 90th business day is August 7 in Spain's national calendar (128 calendar days), August 10 in the US calendar (131), August 11 in the England and Wales calendar (132) and August 12 in Germany's nationwide calendar (133).

What a term past 60 days has to show

The Net 60 guide quotes the 60-day rules themselves. For Net 90 the question is what lets a term go beyond them, and the answer differs by jurisdiction.

EU. Article 3(5) of Directive 2011/7/EU lets a business-to-business term run past 60 calendar days only if two conditions both hold: the contract expressly agrees it, and it is not grossly unfair to the creditor. Article 7 lists what the unfairness question turns on: all circumstances of the case, including any gross deviation from good commercial practice, contrary to good faith and fair dealing; the nature of the product or service; and whether the debtor has any objective reason to deviate from the 60-day period. A grossly unfair term or practice is either unenforceable or gives rise to a claim for damages.

UK. The Late Payment Act does not strike the term out. Instead, under section 4(2E) and (2F), a private-sector buyer that agreed Net 90 owes statutory interest from the end of the 60-day period unless the 90-day payment day is not grossly unfair to the supplier, and section 4(7A) points to the same three circumstances as the Directive.

Germany. § 271a BGB applies the same pair of conditions to a payment that can be demanded only more than 60 days after receipt: express agreement, and no gross unfairness to the creditor.

Spain. No agreement can take the term there. Article 4.3 of Ley 3/2004 caps any agreed extension at 60 calendar days, so Net 90 between businesses is over the limit.

Public-sector buyers. Under Article 4(6) of the Directive, even an expressly agreed and objectively justified period for a public authority may not exceed 60 days, and section 4(2D) of the UK Act ties a public-authority purchaser to its 30-day period whenever the agreed day falls later. US federal payments are dated from the 30th day after a proper invoice under FAR 52.232-25.

Instalments instead of one long wait

The Directive leaves room for a different structure. Article 5 provides that it is without prejudice to the parties' ability to agree, subject to national law, on payment schedules providing for instalments, and that interest and compensation are then calculated only on the overdue amounts. § 271a BGB says the same from the German side: its limits do not apply to agreed instalment payments (subsection 5, number 1). A schedule of, say, 50 percent on order and 50 percent on Net 90 halves the amount the seller finances for the full period.

Day 90 on a public holiday

Ninety days from Tuesday, February 24, 2026 is Monday, May 25, 2026: Memorial Day in the US, the Spring Bank Holiday in England and Wales and Whit Monday (Pfingstmontag) in Germany, yet an ordinary working day in Spain's national calendar. Where it is a holiday, Tuesday, May 26 is the next business day. The term does not move the date to that Tuesday by itself; the contract does, or for US federal contracts the next-working-day rule in FAR 52.232-25 that the Net 30 guide sets out. The invoice due date calculator marks a due date that lands on a holiday.

What a quarter of float costs the seller

Ninety days of credit cost three times as much to carry as thirty. A seller paying 10 percent a year for its money spends 10,000 x 0.10 x 90 / 365, about 247, financing one 10,000 invoice to day 90, and when every customer pays on that day roughly a quarter's sales sit in receivables at once.

That makes an early-payment discount cheap for the buyer to refuse. "2/10 Net 90" offers 2 percent off for payment within 10 days; skipping it keeps 98 percent of the invoice for 80 more days, an implied annual rate of (2 / 98) x (365 / 80), about 9.3 percent, against 37.2 percent for 2/10 Net 30. The early payment discount calculator runs any pair of numbers.

When a Net 90 invoice is paid late

Once interest for late payment becomes payable, Article 6 of the Directive entitles the creditor to a fixed sum of at least EUR 40 as compensation for recovery costs, without a reminder, plus reasonable compensation for recovery costs above that. The UK Act's section 5A sets the fixed sum at 40 pounds for a debt under 1,000 pounds, 70 pounds for a debt from 1,000 to under 10,000 pounds, and 100 pounds for 10,000 pounds or more. The late payment interest calculator works out the interest on top. The guides on Net 15 and Net 45 cover the shorter terms.

FAQ

Is Net 90 calendar days or business days?

A bare "Net 90" is read as calendar days, and the statutory 60-day line is drawn in calendar days. Written as business days on a Monday-to-Friday week, the term takes 126 calendar days counted from a working day and never fewer than 124, well over a month longer.

What happens if a Net 90 due date falls on a weekend or holiday?

It stays on that day. An invoice dated February 24, 2026 reaches day 90 on Monday, May 25, a public holiday in the US, England and Wales and Germany; only the contract, or FAR 52.232-25 for US federal contracts, lets payment slide to Tuesday, May 26.

Is Net 90 allowed under late-payment law?

Not as a matter of course. Between businesses, the EU Directive and § 271a BGB accept it only if expressly agreed and not grossly unfair to the creditor, and the UK Late Payment Act lets statutory interest run from the end of the 60-day period unless the 90-day term is not grossly unfair. Spain's Ley 3/2004 does not allow an agreed term beyond 60 calendar days at all. With a public-sector buyer, the Directive caps any agreed period at 60 days.

What is the difference between Net 90 and three months?

Net 90 is 90 days, counted as the contract says. Three calendar months are 89 to 92 days depending on the months covered, so the two give the same date only on some invoices. Write the term the way you mean it.

Can I charge late fees on overdue Net 90 invoices?

A contract can set a late-payment rate. Without one, statutory interest can apply in the EU and the UK, and both add a fixed compensation sum once it does: at least EUR 40 under Article 6 of Directive 2011/7/EU, and 40, 70 or 100 pounds by debt size under section 5A of the UK Late Payment Act.