Net-30 isn’t a payment term. It’s an unsecured loan.

Offering a customer 30 days to pay feels like a courtesy — a normal cost of doing business. But look at what actually happens the moment you send a net-30 invoice. You hand over your product or service today, you agree to wait a month for the money, you charge no interest for the wait, and nothing secures the debt if the customer doesn’t pay. That isn’t a payment term. It’s a loan. And most small businesses are writing these loans dozens of times a month without ever deciding who qualifies.

You’re already in the lending business

Strip away the invoice language and the arrangement is plain. The Corporate Finance Institute defines trade credit exactly this way: when a seller lets a buyer pay later, “the seller is said to extend credit to the buyer.” It is, in their words, “a form of short-term debt that doesn’t have any interest associated with it” — and it carries “default risk… as a borrower may be unable to pay off the required debt obligations.”

A bank that lent money this way — no credit check, no collateral, and no interest rate to cover the losses — wouldn’t survive a quarter. Yet that is the standard operating model for B2B sellers who offer terms. The difference is that a bank knows it’s underwriting a loan and prices the risk accordingly. Most business owners think they’re just sending an invoice.

More of those loans are going unpaid

The book is getting riskier. Intuit QuickBooks’ 2026 Small Business Late Payments Report, published in July, found that 59% of small businesses are now carrying invoices overdue by 30 or more days — up sharply from 47% a year earlier. The average unpaid balance sits at roughly $17,700 per business. And the terms you offer track directly with how much of that money slips. Among businesses that require immediate payment, 26% carry overdue invoices. Among those offering net-30, the figure is 55%. Extending terms roughly doubles the share of receivables that go past due.

The risk you never priced in

Allianz Trade, a commercial credit insurer, states it directly: “Extending credit has an impact on your cash flow and can open you up to the risk of late or non-payment.” Their advice before you offer terms to anyone is to “check their creditworthiness.” Most small businesses skip that step entirely. They extend the same 30 days to a decade-old client and to a brand-new account they met last week, on the same handshake.

When one of those loans goes bad, there is no reserve set aside and no interest margin to absorb it — the loss comes straight out of the cash you were counting on. QuickBooks found that 39% of owners say a single late payment made covering payroll or bills difficult in the past year. A lender expects a certain percentage of defaults and builds it into the rate. A small business that never saw itself as a lender has no such cushion, so every default lands as a full loss on money it had already spent earning.

A bad loan doesn’t stop with you

When your customers pay slowly, you tend to pass the squeeze down the line. In the same QuickBooks report, 42% of small businesses said they delayed payments to their own contractors, suppliers, or vendors because of outside pressures, and among businesses carrying overdue invoices, 38% grew more reliant on credit cards to bridge the gap. The unsecured loan you extended to a customer quietly becomes borrowing you take on yourself — often at real interest rates — to cover the hole it left. That’s the true price of an unmanaged receivable: not just the money that’s late, but the more expensive money you borrow to stand in for it.

You can’t stop lending — so manage the book

For most B2B businesses, refusing to offer terms isn’t realistic. Net-30 is table stakes to win the work, and demanding payment up front would cost you customers. So the answer isn’t to stop extending credit. It’s to treat each receivable as what it already is — an outstanding loan — and manage it like one. Know who you’re lending to before the first invoice goes out. Watch the aging instead of waiting for a surprise. And act the moment a payment slips, rather than letting it drift for four months toward a collections agency that will take a cut of whatever is left.

The cost of a bad trade-credit decision was never the late fee. It’s the weeks of your own cash tied up funding someone else’s business — and the real chance that, the longer you wait, you never see it again.