Your supplier's invoice says "2/10 net 30" at the top, and you do what most busy owners do: you file it and pay on day 30. That felt like free use of someone else's money for a month. It was actually one of the most expensive loans you will ever take. On a $10,000 invoice, paying on day 30 instead of day 10 costs you $200 in a lost discount — $200 paid for the privilege of holding $9,800 for 20 extra days. Annualized, that is roughly a 36 percent interest rate, higher than almost any credit card in your wallet and several times the rate on a bank line of credit. The discount date, not the due date, is the number that matters on every invoice you receive.
Trade credit — buying goods now and paying later — is one of the most widely used forms of business financing in the economy. The Federal Reserve's 2025 Small Business Credit Survey found that 17 percent of employer firms sought trade credit in the prior 12 months, and globally the World Trade Organization estimates that 80 to 90 percent of world trade relies on trade finance in some form. This guide decodes the notation on your invoices, shows the real math behind early-pay discounts, explains what happens when you pay late, and walks through exactly how buyers and sellers record all of it in their books.
Reading the Notation: What "2/10 Net 30" Actually Says
Trade-credit terms are written as a compact code with three parts: a discount percentage, a discount window, and a final due date.
2/10 net 30 means: take a 2 percent discount if you pay within 10 days of the invoice date; otherwise the full ("net") amount is due within 30 days. On a $10,000 invoice, you owe $9,800 if you pay by day 10 and $10,000 if you pay any time from day 11 through day 30.
Once you see the pattern, every variant reads the same way:
- Net 30 / Net 60 / Net 90. No discount offered. The full amount is due 30, 60, or 90 days after the invoice date. This is the most common form of trade credit: an interest-free loan from your supplier for the length of the term.
- 1/10 net 30. A 1 percent discount for paying within 10 days, net due in 30. A smaller reward for speed — but as the math below shows, still a generous one.
- 2/10 net 60. The same 2 percent discount, but you get 60 days to pay in full. Because the extra float is longer, skipping this discount is much cheaper than skipping 2/10 net 30.
- 2/10 EOM net 30. "End of month": the 10-day discount clock starts at the end of the month in which you were invoiced, and the net amount is due 30 days after that. An invoice dated the 2nd effectively gives you about 40 days of float.
- COD (cash on delivery) and CIA (cash in advance). No credit at all. COD means you pay when the goods arrive; CIA means you pay before they ship. Suppliers impose these on new customers with no credit history or buyers who have burned them before.
- Consignment. You pay only for what you sell, and unsold goods go back. Common in bookstores, galleries, and specialty retail.
Terms are set by the seller and often negotiable, especially once you have a payment history. A buyer who reliably pays net 30 invoices on time can frequently ask for net 45 — or for a discount term where none existed. The worst outcome is a no.
Why the Deal Exists: What Each Side Gets
Trade credit solves a timing mismatch. You need inventory or materials weeks before your customers pay you; your supplier wants the sale and would rather extend 30 days of credit than lose the order to a competitor. Both sides gain something real:
For buyers, it is interest-free short-term financing with almost no paperwork. You can receive goods, manufacture or resell them, and collect revenue before the supplier's invoice comes due — the cash from the sale retroactively covers the cost of goods sold. For businesses with thin access to bank credit, supplier terms are often the largest source of working capital available.
For sellers, terms win orders, build loyalty, and support larger purchase volumes: buyers order more freely when no cash leaves their account today. The costs are delayed cash collection, the administrative work of invoicing and collections, and bad-debt risk — some buyers will inevitably fail to pay. The early-pay discount exists to soften exactly those costs: the seller happily accepts 98 cents on the dollar to get cash in 10 days instead of 30 and to shrink the window in which something can go wrong.
The 36 Percent Math: What Skipping the Discount Really Costs
Here is the calculation almost nobody does — and the one that changes how you handle invoices. When you pass up 2/10 net 30, you are not "saving nothing." You are paying $200 to keep $9,800 for 20 extra days (day 10 to day 30). Expressed as an annual rate:
(Discount % ÷ (100% − Discount %)) × (365 ÷ (Net days − Discount days))
For 2/10 net 30:
(2 ÷ 98) × (365 ÷ 20) = 0.0204 × 18.25 ≈ 37.2%
Using a 360-day bank year, the same terms annualize to about 36.7 percent — which is why finance textbooks quote "approximately 36 percent" for 2/10 net 30. Either way, skipping the discount is equivalent to borrowing at credit-card-plus rates.
Run the same formula across common terms and the pattern is stark:
| Terms | Extra days of float | Annualized cost of skipping |
|---|---|---|
| 2/10 net 30 | 20 | ~37% |
| 1/10 net 30 | 20 | ~18% |
| 2/10 net 60 | 50 | ~15% |
| 1/10 net 60 | 50 | ~7% |
| Net 30 (no discount) | — | 0% (nothing to skip) |
Two lessons fall out of the table. First, short discount windows with short net periods are brutally expensive to skip — 2/10 net 30 tops the list. Second, the longer the net period, the cheaper the float: skipping 2/10 net 60 costs less than half as much as skipping 2/10 net 30, because you get 50 days of supplier financing instead of 20.
The decision rule follows directly: take the discount unless your own cost of capital is higher than the annualized rate. If your line of credit charges 12 percent and the discount annualizes to 37 percent, borrowing to pay early earns you the 25-point spread. It feels backwards to borrow money to pay a bill early, but the math is unambiguous — a 2 percent return over 20 days beats nearly every safe use of cash available to a small business. The genuine exception is a cash position so tight that paying early risks missing payroll or bouncing a payment. In that case the discount is unaffordable at any rate, and preserving the cash is the right call.
What Happens When You Pay Late
The net date is a real deadline, not a suggestion. Typical consequences escalate in stages:
- Late fees and interest. Many sellers charge a monthly late fee — commonly 1 to 1.5 percent of the overdue balance — which itself annualizes to 12 to 18 percent on top of the discount you already forfeited.
- Lost terms. Chronic late payers get moved to shorter terms, then to COD or cash in advance. Losing net 30 across your supplier base can remove tens of thousands of dollars of working capital overnight.
- Credit damage. Sellers can report delinquencies to business credit bureaus, where they sit on your business credit file and affect future financing, insurance pricing, and whether new suppliers extend terms at all.
- Collections and relationship damage. Persistent delinquency ends in a collections agency or a lawsuit, and the commercial relationship is over well before that point.
If cash is short in a particular month, call the supplier before the due date rather than silently paying late. A partial payment plus a realistic date for the balance preserves far more goodwill — and often avoids the late fee — than silence followed by a late check.
How Buyers Book It: The Gross Method vs. the Net Method
Under accrual accounting, a credit purchase hits your books twice: once when the invoice arrives (inventory or expense plus accounts payable) and once when you pay (accounts payable down, cash down). The discount adds one wrinkle, and accountants handle it two ways.
The gross method records the invoice at its full amount and recognizes the discount only if you take it. For a $10,000 purchase at 2/10 net 30, paid within the window:
At purchase:
Dr Inventory (or relevant expense) 10,000
Cr Accounts Payable 10,000
At payment (discount taken):
Dr Accounts Payable 10,000
Cr Cash 9,800
Cr Purchase Discounts 200Purchase Discounts is a contra-account that reduces your cost of goods sold — your inventory effectively cost $9,800, so your gross margin reflects that. If you pay late under the gross method, there is no third entry: you simply debit payables $10,000 and credit cash $10,000. The discount you forfeited is invisible in the ledger, which is the method's main weakness — management never sees a number for discounts missed.
The net method records the invoice at the discounted amount from the start, on the assumption you will pay early:
At purchase:
Dr Inventory (or relevant expense) 9,800
Cr Accounts Payable 9,800
At payment (discount taken):
Dr Accounts Payable 9,800
Cr Cash 9,800
If paid late instead, one extra entry:
Dr Purchase Discounts Lost 200
Cr Accounts Payable 200
Dr Accounts Payable 10,000
Cr Cash 10,000Purchase Discounts Lost is the star of this method: every dollar in it is a financing cost your business chose to incur, visible on the income statement as a separate expense. A growing balance is management's signal that invoices are sitting too long. The net method is theoretically cleaner — the payable is recorded at its true expected settlement amount — but the gross method dominates in practice because most small-business accounting software defaults to it.
Whichever method you use, the economics are identical: discounts you take reduce what your inventory cost, and discounts you miss are financing expense by another name.
How Sellers Book It: Sales Discounts and Receivables
The seller's side mirrors the buyer's. Under the gross method, the sale is recorded at full invoice value, and discounts taken by customers land in Sales Discounts, a contra-revenue account:
At sale (terms 2/10 net 30, \$10,000 invoice):
Dr Accounts Receivable 10,000
Cr Sales Revenue 10,000
Customer pays within the window:
Dr Cash 9,800
Dr Sales Discounts 200
Cr Accounts Receivable 10,000Net sales — gross sales minus sales discounts, returns, and allowances — is the revenue figure that actually flows to your income statement, so a heavy discount program shows up as the gap between what you billed and what you kept. Under the net method, sellers record the receivable net of the discount and book Sales Discounts Forfeited (extra revenue) when customers pay full price late.
Two seller-side cautions. First, discounts taken shrink your reported revenue, so price your discount into your margins deliberately — offering 2/10 net 30 to every customer on 8 percent margins gives away a quarter of your profit. Second, receivables are not cash: a growing accounts-receivable balance with slowing collections is the classic early warning of a cash crunch, and an allowance for doubtful accounts should reflect the reality that some of those balances will never arrive.
Tracking It in Plain-Text Books
If you keep your books in Beancount, the discount window becomes visible the moment you enter the invoice — which is exactly when you need to see it. Record the payable on arrival, then record the payment with the discount as a reduction of the original expense:
2026-10-05 * "Acme Supply" "Invoice 4471 — shop supplies, 2/10 net 30"
Expenses:Shop-Supplies 10,000.00 USD
Liabilities:Accounts-Payable:Acme
2026-10-13 * "Acme Supply" "Invoice 4471 — paid day 8, 2% discount taken"
Liabilities:Accounts-Payable:Acme 10,000.00 USD
Assets:Checking -9,800.00 USD
Expenses:Shop-Supplies -200.00 USDThe negative leg against the original expense account leaves your true cost — $9,800 — in the ledger, equivalent to the gross method's Purchase Discounts account but without maintaining a separate contra-account. If you pay late instead, the payment entry is a straight $10,000 of payables against $10,000 of cash, and the missing $200 leg is your forfeited discount. A balance report on your payables account then doubles as your discount calendar: any balance older than its terms' discount window is money you are choosing to leave on the table. The Beancount documentation covers payables workflows and balance reports in more depth if you are setting this up for the first time.
A Practical Playbook for Your Next Batch of Invoices
Put the pieces together into a routine you can run every payables cycle:
- Calendar the discount date, not the due date. When an invoice arrives, compute the last day of the discount window and put that on your payment calendar. Paying "a few days early" by accident is how discounts get captured without any heroics.
- Rank invoices by annualized cost, not by balance. A $2,000 invoice at 2/10 net 30 (37 percent) outranks a $20,000 invoice at net 60 with no discount when cash is limited. Pay the expensive float first.
- Negotiate terms before you need them. Ask reliable suppliers for discount terms or longer net periods while your payment record is spotless. 2/10 net 30 you never use costs you nothing; net 60 you negotiated last year is working capital you already have.
- Watch EOM and dating traps. "2/10 EOM" and "net 30" measured from statement date rather than invoice date shift your windows by weeks. Read the exact dating language on each supplier's terms once, note it in your vendor file, and stop re-decoding it every month.
- Automate the capture. If your accounting software supports early-payment reminders or auto-scheduling by discount date, turn them on. Discounts are lost to inattention far more often than to genuine cash shortage.
Pull your last month of paid supplier invoices today and sort them by terms. For every 2/10 net 30 invoice you paid after day 10, divide the lost discount by the invoice total and annualize it with the formula above — then add up what the year's worth of that habit costs. That number is the return on simply paying the same bills a few days sooner.
