On an invoice, Net 20 means you have 20 calendar days from the invoice date to pay the full balance. The “net” is the total owed after any credits or adjustments, and the “20” counts every day of the week, weekends and holidays included. It’s a shorter window than the more common Net 30, so a seller offering Net 20 is asking to be paid faster than the B2B default.1US Chamber of Commerce. What Are Net Payment Terms
When the 20 Days Start
The clock begins on the invoice date printed at the top of the document, not the day the goods arrived or the day you opened the envelope. Under the Uniform Commercial Code, when goods are shipped on credit the credit period runs from the time of shipment, and if the seller post-dates the invoice or delays sending it, the start of the credit period shifts with it.2Legal Information Institute. UCC 2-310 Open Time for Payment or Running of Credit
A seller can’t quietly sit on an invoice and then claim the 20 days ran out weeks ago. The invoice and the clock travel together. Contracts can override this default by tying the start to delivery confirmation or the buyer’s receipt of goods, in which case the contract controls. If the agreement is silent, treat the invoice date as day one.
How to Count to Day 20
Count 20 calendar days from the invoice date, including Saturdays, Sundays, and holidays. An invoice dated March 3 is due March 23. An invoice dated December 10 is due December 30, even though the window spans Christmas.
When day 20 falls on a weekend or federal holiday, common business practice is to treat the next business day as the effective deadline. A federal regulation governing administrative deadlines captures the same principle: count all days including weekends and holidays, but if the due date lands on a non-working day, the deadline moves to the next working day.3eCFR. 45 CFR 16.19 – How to Calculate Deadlines Whether your contract follows that convention depends on what it says. If the agreement is silent, paying by the next business day is the safe move; paying a day early eliminates the question.
Discounts Written Into Net 20
Some Net 20 invoices offer a discount for paying ahead of the deadline. The format looks like “1/10 Net 20,” meaning you take 1% off if you pay within 10 days, and the full balance is due at day 20.
Small percentages tell a bigger story than they look. On a $10,000 invoice, a 2% discount for paying 20 days early (as in the more common 2/10 Net 30) saves $200, and annualized that works out to roughly 36.7%.1US Chamber of Commerce. What Are Net Payment Terms Very few businesses earn that kind of return on cash sitting in a bank account. Run the same math on any early-pay term you’re offered before deciding whether to take it.
How Net 20 Compares to Other Terms
Net 20 sits between Due on Receipt and the standard B2B default.
- Due Upon Receipt gives no credit period at all. Payment is expected as soon as the buyer gets the invoice. It shows up in new relationships or with buyers whose payment history is shaky.
- Net 30 is the most widely used credit term in B2B transactions, aligning with most companies’ internal billing cycles.
- Net 60 and Net 90 are longer windows typically reserved for large orders, established relationships, or industries where the buyer resells goods before paying.
A seller shifting a buyer from Net 30 to Net 20 is tightening credit, which usually follows late payments or a change in the buyer’s financial profile. Movement the other direction is a sign the relationship is strengthening.
If You Dispute the Invoice
Disagreeing with an invoice doesn’t pause the deadline. Under the UCC, once you’ve accepted the goods you must notify the seller of any problem within a reasonable time, or you lose the right to pursue a remedy.4Legal Information Institute. UCC 2-607 Effect of Acceptance Notice of Breach
If the goods arrived damaged, the quantity was wrong, or the price doesn’t match your purchase order, contact the seller immediately and document the dispute in writing before day 20. Silence followed by nonpayment is the weakest position you can take. A written dispute sent before the due date is much stronger.
What Happens If You Pay Late
Missing a Net 20 deadline costs money and credibility. Most commercial contracts include a late fee, typically 1% to 2% of the outstanding balance per month. At 1.5% monthly, that compounds to 18% annually, which can meaningfully inflate the cost of whatever you bought.
The relational damage is harder to quantify but often bigger. A seller who gets paid late repeatedly will shorten your terms, move you to payment in advance, or require cash on delivery. Winning credit terms back takes time and a clean track record. Persistent nonpayment eventually triggers collection efforts, adds fees, and can damage your business credit profile with reporting agencies.