On an invoice, “Net 30” means the buyer owes the full amount within 30 calendar days of the invoice date. It functions as a short, interest-free credit line from the seller: you get the goods now, and the cash leaves your account up to a month later. The term is the default in most business-to-business billing, which is why it shows up on so many invoices without further explanation.
How to Count the 30 Days
The clock starts on the date printed on the invoice, not the date you opened the envelope or the email. An invoice dated October 5 is due by November 4. Every calendar day counts, including weekends and holidays. If day 30 lands on a Saturday, Sunday, or bank holiday, most contracts push the deadline to the next business day, but the specific contract language controls.
This is where a lot of disputes start. Sellers count from the invoice date. Buyers often count from the day the invoice actually showed up. An invoice dated June 1 that arrives June 5 has the seller expecting payment by July 1 and the buyer planning for July 5. Four days doesn’t sound like much until it triggers a late fee. The cleanest fix is to spell out in the purchase order or contract whether Net 30 runs from the invoice date, the delivery date, or the receipt date.
If your contract doesn’t address payment timing at all, the Uniform Commercial Code fills the gap: payment is due when the buyer receives the goods.1Cornell Law School. UCC 2-310 – Open Time for Payment or Running of Credit Most Net 30 arrangements override that default by tying the deadline to the invoice date. But with no written terms, the UCC default is what governs.
Other Terms You’ll See Next to Net 30
Net 15, Net 60, and Net 90 work the same way with a shorter or longer window. “Due Upon Receipt” means payment is expected as soon as the invoice arrives, and sellers often use it with new or higher-risk customers.
You’ll also see EOM and prox on some invoices. EOM stands for “End of Month.” An invoice marked Net 10 EOM is due 10 days after the end of the month it was issued in, so an invoice dated March 12 with Net 10 EOM terms is due April 10. Prox (from “proximo,” meaning next month) sets a fixed day. “Prox 15th” means the 15th of the following month regardless of the invoice date, so invoices dated February 3 and February 27 would both come due March 15. Wholesale distributors and other high-volume sellers often prefer these formats because they collect on predictable dates.
Early Payment Discounts: 2/10 Net 30
The most financially significant variation is the early-payment discount, written as “2/10 Net 30.” That means a 2% discount if you pay within 10 days; otherwise the full amount is due at 30.2J.P. Morgan. How Net Payment Terms Affect Working Capital On a $1,000 invoice, that’s $20 saved for paying 20 days earlier.
Twenty dollars feels small, but the annualized rate on those savings works out to roughly 36.7%. In effect, a buyer who skips the discount is paying that rate for the extra 20 days of holding the cash. If your business can borrow at anything less, taking the discount is almost always the better move. Sellers offer these terms because getting cash 20 days sooner is cheaper than a bank line of credit for them, so the incentive runs both ways.
If the Shipment Is Wrong or Damaged
The 30-day countdown doesn’t stop on its own when a delivery arrives short, damaged, or nonconforming. You do have the right to inspect goods before paying, and a seller can’t demand payment for items you haven’t had a reasonable chance to examine.1Cornell Law School. UCC 2-310 – Open Time for Payment or Running of Credit If the goods don’t match the contract, you can reject all of them, accept all of them, or accept the conforming portion and reject the rest.
You need to act quickly and in writing. Rejection must happen within a reasonable time after delivery, and the seller has to be notified promptly. Silence gets treated as acceptance, and accepted goods must be paid for at the contract price.3Cornell Law School. UCC 2-607 – Effect of Acceptance; Notice of Breach Even after accepting a shipment, you can still pursue a remedy for defects, but only if you notify the seller within a reasonable time of discovering the problem. Miss that notice and you lose the claim. Inspect fast, document issues, and put your concerns in writing before day 30 arrives, because a dispute doesn’t automatically extend the deadline unless your contract says so.
What Happens If You Pay Late
A missed Net 30 deadline triggers whatever penalty the contract spells out. Late fees on commercial invoices typically run 1% to 2% per month on the outstanding balance. At 1.5% per month, that’s an 18% annual rate, and it adds up quickly on larger invoices.
State usury laws cap what a seller can charge, but the caps vary widely and many states set no fixed maximum on commercial transactions, requiring only that the rate be reasonable. The important detail: late fees and interest are enforceable only if they appear in a written contract or on the invoice itself. A seller who never mentioned late fees can’t add them after the fact.
Money aside, late payment changes the relationship. When a buyer fails to pay as the invoice becomes due, the seller has a legal right to sue for the price plus incidental damages.4Cornell Law School. UCC 2-709 – Action for the Price Most sellers don’t go straight to court. They tighten terms instead. A vendor who once offered Net 60 might cut you to Net 15 or require cash on delivery. If the account moves to collections, you’re on the hook for collection costs only if your original contract assigns that liability; otherwise the seller absorbs those fees.
How Net 30 Payments Affect Your Business Credit
One of the less obvious reasons Net 30 matters is what it does to your business credit profile. When a vendor reports your payment history to a business credit bureau, every on-time payment builds your score and every late one pulls it down.
The Dun & Bradstreet PAYDEX score is the most commonly referenced measure. It runs 0 to 100 based on how quickly you pay relative to agreed terms. A score of 80 means on-time payment. Higher scores reflect early payment; lower scores reflect increasingly late payment.5Dun & Bradstreet. PAYDEX Score FAQs Larger invoices carry more weight in the calculation, so a late payment on a big order hurts more than one on a small purchase.
Not every vendor reports, though. If building business credit is a priority, confirm that your Net 30 vendors actually submit payment data to Dun & Bradstreet, Experian, or Equifax. A perfectly paid invoice to a non-reporting vendor does nothing for your score. Payment activity generally takes 60 to 120 days to start showing up on business credit reports.
Late payments get reported once an account is at least 30 days past its due date.6Experian. When Do Late Payments Get Reported For a Net 30 invoice, that means a late mark can hit your file at 60 days from the invoice date. A strong score helps you negotiate better terms with future vendors and strengthens applications for business loans and lines of credit. A weak one closes those doors, and rebuilding takes consistent on-time performance over many months.