To calculate an invoice with terms of 2/10 n/30, multiply the invoice total by 0.02 to find the discount you receive if you pay within 10 calendar days of the invoice date; if you pay after day 10, the full invoice amount is due by day 30. On a $1,000 invoice, that means paying $980 by day 10 or $1,000 by day 30.
What Each Part of the Shorthand Means
Every character in 2/10 n/30 corresponds to a number you will plug into the calculation:
- The 2 is the discount percentage available for early payment.
- The 10 is the number of calendar days you have to pay and still claim that discount.
- The n stands for net, meaning the full invoice amount with no reduction.
- The 30 is the total number of calendar days before the balance becomes past due.
Under the Uniform Commercial Code, payment is due when the buyer receives the goods unless the parties agree to different terms.1Legal Information Institute (LII). Uniform Commercial Code 2-310 – Open Time for Payment or Running of Credit; Authority to Ship Under Reservation When 2/10 n/30 appears on an invoice, the seller and buyer have replaced that default with a two-path structure: pay quickly for a price reduction, or take more time at full price.
Calculating the Two Deadlines
Start with the invoice date and count forward in calendar days, not business days. For an invoice dated June 1 with terms of 2/10 n/30:
- Discount deadline: June 1 + 10 days = June 11. Pay on or before this date to take the 2 percent discount.
- Net due date: June 1 + 30 days = July 1. Pay on or before this date to stay current.
Count carefully across months of different lengths. A January 25 invoice has a discount deadline of February 4, because January has 31 days and the count begins the day after the invoice date.
Trade credit is governed by the contract between buyer and seller, and there is no single federal rule for what happens when a deadline falls on a Saturday, Sunday, or holiday. Many commercial agreements roll the deadline to the next business day, but your specific contract controls. If your 10-day window closes on a Sunday and the agreement is silent, get payment out before the weekend rather than assume you have until Monday.
Calculating the Discount Amount
Convert the discount percentage to a decimal (divide by 100) and multiply by the invoice total. For 2/10 n/30 on a $1,000 invoice:
$1,000 × 0.02 = $20 discount
On a $5,000 invoice the discount is $100. On a $25,000 invoice, common in wholesale transactions, the discount is $500 for paying 20 days sooner than the net due date.
Verify the discount against the correct base. If a credit memo or return has reduced the invoice, apply the 2 percent to the adjusted figure, not the original. Applying it to the wrong base can result in short-paying the seller or overstating savings in your accounting records.
Calculating the Final Payment
Two methods produce the same figure. Subtract the discount from the total ($1,000 − $20 = $980), or multiply the total by 0.98 in one step ($1,000 × 0.98 = $980). For a $5,000 invoice, you would pay $4,900. If the two methods disagree, recheck the base amount.
Missing the 10-day window is not a breach. Paying $5,000 on day 15 simply means you forgo the $100 discount while remaining current under the net 30 terms.
Partial Payments Within the Window
Some sellers allow a pro-rated discount when a buyer pays only part of the invoice within 10 days. Paying $500 toward a $1,000 invoice within the window might earn a 2 percent discount on that $500, saving $10, with the remaining $500 due at full price by day 30. Whether partial-payment discounts are available depends entirely on seller policy. If the invoice does not address it, confirm with the seller before splitting the payment.
Common Variations and What Changes in the Math
The 2/10 n/30 format is the most common, but the same formula handles other combinations. Just swap in the discount percentage, the discount window, and the net period:
- 1/10 n/30: A 1 percent discount for paying within 10 days; full balance due in 30.
- 3/10 n/60: A 3 percent discount for paying within 10 days; full balance due in 60.
- 2/10 n/60: The same 2 percent within 10 days, with 60 days to pay in full.
End of Month (EOM) Dating
When terms read “2/10 EOM,” the 10-day window starts at the end of the month the invoice was issued, not the invoice date. An invoice dated September 10 with 2/10 EOM gives you until October 10 to claim the discount, and the net amount is due by October 30.
Receipt of Goods (ROG) Dating
“2/10 ROG” starts the clock when you receive the goods, protecting buyers whose shipments take days or weeks to arrive. If an invoice is dated September 10 but the shipment arrives October 29, you have until November 8 to pay and receive the discount.
Whether Skipping the Discount Is Worth It
Forgoing a 2 percent discount looks minor on one invoice, but the annualized cost is high. By not paying within 10 days, you are effectively borrowing the invoice amount for the remaining 20 days at a cost of 2 percent. The standard formula:
(Discount % ÷ (100% − Discount %)) × (365 ÷ (Net Days − Discount Days))
For 2/10 n/30:
(2 ÷ 98) × (365 ÷ 20) = 0.0204 × 18.25 = approximately 37.2 percent
That 37 percent annualized rate exceeds what most businesses pay on a line of credit or a short-term bank loan. A company with access to financing at 8 or 10 percent annually is almost always better off borrowing to pay early than letting the discount lapse. Skipping makes financial sense only when the business has no access to cheaper capital and genuinely needs the extra 20 days of cash flow.
The implicit rate changes with the terms. Under 3/10 n/30, it rises to roughly 56 percent. Under 2/10 n/60, it drops to about 15 percent because you gain 50 extra days of float.
What Happens If You Miss the Net 30 Deadline
Missing the 10-day window costs you only the discount. Missing the 30-day net deadline has real consequences:
- Late fees and interest. Many invoices include a late payment clause, commonly 1 to 1.5 percent per month on the outstanding balance. The maximum rate a seller can charge varies by state, so review your purchase agreement.
- Damaged business credit. Suppliers and lenders review payment history when deciding whether to extend credit, and late payments appear on business credit reports.2U.S. Small Business Administration. Five Factors that Impact Your Business Credit
- Tighter future terms. A seller who regularly waits past day 30 for payment may shorten the net period, drop the discount option, or switch you to payment on delivery.
- Collection action. Invoices unpaid well past the net date can be sent to collections or trigger a breach-of-contract claim, depending on the amount and the seller’s policies.
Tracking due dates in accounting software or a spreadsheet is the simplest way to avoid these outcomes. Most systems can flag upcoming deadlines and calculate the discount automatically, giving your team time to decide whether paying early is worth the cash outlay.