Net 30 is a credit term written on an invoice. It says the buyer owes the full invoice amount, with nothing taken off for paying early, and that the amount falls due 30 days later, counted from the invoice date unless the contract or a governing rule names a different starting event. The word net names the amount and the number names the days allowed.
The term itself does not name that event. The invoice date is only the ordinary commercial reading, a convention rather than a rule, and the competing candidates are delivery, the end of the month, and the day the buyer’s office received the invoice.
When the Count Starts
Three dates compete on any given invoice: the date printed on the invoice, the date the goods were delivered or the services accepted, and the date the buyer’s billing office received the invoice. The regimes that write the answer down do not pick the same one. Only one of them, Article 2 of the Uniform Commercial Code, reaches a private sale at all, and even then only a sale of goods, since the article applies to transactions in goods (UCC 2-102).
Federal payment rules start on receipt, but they define receipt themselves. The period available to an agency to make timely payment of an invoice without incurring an interest penalty begins on the date of receipt of a proper invoice, meaning one carrying the content the rules require (5 CFR 1315.4(f)). Where the contract fixes no date, no discount is taken and no accelerated method applies, payment is then due 30 days after that period starts (5 CFR 1315.4(g)(1)(iv)). Receipt there is a defined event, not simply the day the invoice arrived. An invoice is deemed received on the later of the date a proper invoice actually reached the designated agency office, where the agency annotates it with that date on receipt, and the seventh day after the property is actually delivered or the services are actually completed, with an earlier acceptance date substituting for that seventh day, and with the date of actual acceptance or the end of a longer contractual acceptance period substituting where the contract sets a longer one (5 CFR 1315.4(b)). What that does to a payables cycle time is worked through in an accounts payable outsourcing case study.
The standard federal prompt payment clause reaches the same shape from the other direction, naming both events on the face of the clause. The due date for making invoice payments is the later of the 30th day after the designated billing office receives a proper invoice from the contractor and the 30th day after government acceptance of supplies delivered or services performed (Federal Acquisition Regulation, 52.232-25(a)(1)(i)). The invoice date becomes the start only where the billing office fails to annotate the invoice with the actual date of receipt, and then only if the invoice is proper and there is no disagreement over quantity, quality or contractor compliance with contract requirements (Federal Acquisition Regulation, 52.232-25(a)(1)(ii)).
Sales of goods have a third answer again. Where a state’s enacted version of Article 2 of the Uniform Commercial Code governs and the seller is required or authorized to ship on credit, the credit period runs from the time of shipment, but post-dating the invoice or delaying its dispatch will correspondingly delay the starting of the credit period (UCC 2-310(d)). That yields to whatever the parties agreed, since the section opens with unless otherwise agreed, and absent agreement payment is due at the time and place at which the buyer is to receive the goods (UCC 2-310(a)).
Put numbers on it. Say an invoice is dated March 3, the services are accepted on March 10, and the buyer’s billing office records receiving the invoice on March 12. Counting 30 days from the invoice date makes it due April 2, counting from receipt makes it April 11, and taking the later of receipt and acceptance makes it April 11 as well, because acceptance runs out on April 9. Same invoice, same term written on it, and the due date moves by nine days depending on which start the contract wrote down.
Calendar Days, Not Business Days
The days are counted straight through. In the federal payment rules, day means a calendar day including weekend and holiday, unless otherwise indicated (5 CFR 1315.2(k)). The standard prompt payment clause says the same about itself, that all days referred to in the clause are calendar days unless otherwise specified (Federal Acquisition Regulation, 52.232-25).
A private invoice inherits none of that, because those rules bind federal agencies and their contractors rather than a business selling to another business. A term meant to run on business days has to say so.
The Variants Written on Real Invoices
Other notations turn up in the same slot on an invoice, and each one changes something different.
Due on receipt grants no credit period at all. The amount is payable when the invoice arrives, so it is not a net term with a short count, it is the absence of one.
Net 30 EOM moves the start to the end of the month the invoice falls in, so invoices dated across a whole month share a single due date. The EOM stands for end of month, and it is the one common variant that writes the starting event into the term itself rather than leaving it to the contract.
2/10 net 30 packs two terms into one notation, an early-payment reduction and a due date for the full amount. It reads as a 2% reduction if the invoice is paid within 10 days, and the whole amount at day 30 if it is not, and the pattern turns up in export practice: for US manufacturers exporting to Canada, typical terms are 30 to 90 days with a discount of 1% to 2% of the invoice for early payment, usually if paid within 10 days (International Trade Administration, Canada Trade Financing). Where that reduction lands in the accounts is set out in net sales, and the account that carries it is described in contra revenue.
Longer counts are the same construction. An open account transaction is a sale where the goods are shipped and delivered before payment is due, which in international sales is typically in 30, 60 or 90 days (International Trade Administration, Methods of Payment). Net 60 and net 90 are read exactly like net 30 with the count changed, and the start-date question sits on them the same way.
What Net 30 Is Not
It is not a measured average. Net 30 is what the invoice granted, while the payable period is the average days a business actually took to pay its suppliers and the payment period is a span a payroll or a contract defines. A supplier can grant net 30 and still be paid later than that, and only the measures show the gap.
It is not billing in arrears. Arrears fixes when the invoice is raised, after the period it covers, which is arrears billing on the seller’s side and payable in arrears on the buyer’s. Net 30 fixes when an invoice already raised falls due.
It is not a change to when the sale is recorded, because the receivable turns on the right to consideration becoming unconditional rather than on the due date, a test accounts receivable sets out.
It is not the same phrase as due in 30 days. That wording names the span without naming the amount, and neither phrase fixes the starting event on its own.
Net 30 in a Firm’s Receivables Work
The practical work is getting the start onto the document. An invoice that carries its own date, the delivery or acceptance date, and the agreed starting event leaves nothing to reconstruct when someone chases the account months later, and what to do once an account is genuinely past due is worked through in accounts receivable best practices.
Common Questions
The buyer has 30 days from whichever event the contract starts the count on, so the answer turns on that event rather than on the number. How long the cash actually takes is a separate question, measured after the fact instead of agreed in advance, and days sales outstanding is where it gets counted.
The invoice goes past due, and what follows is whatever the contract provides. Federal contracting is the case with the rule written down: the designated payment office will pay an interest penalty automatically, without request from the contractor, if payment is not made by the due date and the listed conditions are met, and where the due date falls on a Saturday, Sunday or legal holiday the office may pay on the following working day without incurring a late payment interest penalty (Federal Acquisition Regulation, 52.232-25(a)(4)).
Granting the term makes the seller the buyer’s lender for the length of it. The work is finished, the invoice is out, and the cash is not in, so the amount sits in accounts receivable for the whole credit period. The risk that it is never collected at all is what bad debt expense provides for.
Accountably places trained offshore accountants and tax preparers inside US CPA and EA firms, and a firm can put a block of its own invoicing and receivables work through a trial task before anything client facing depends on it.
