Happy Monday,
Welcome back to Balance Sheet. Every issue follows one real business with a problem hiding in its numbers, walks through what went wrong on the books, and shows you the fix.
Today's issue is about 2/10 net 30, the early payment discount printed on millions of vendor invoices. Tomas Becker runs Redline Collision, a 9-bay auto body shop in Sacramento, and he buys about $42,000 a month in paint, clear coat, and replacement parts on 2/10 net 30 terms. For six years he paid every invoice on day 30, which cost him $10,080 a year in discounts he never took. The fix was a cost-of-credit comparison and a draw on a line of credit he already had.
Here's how it started, and what it can teach you before your next vendor payment run.
Paying on day 30 felt responsible
Tomas learned cash management from his father, who ran the shop before him. The rule was simple. Never pay a bill before it's due, and keep the cash in the account as long as possible.
That rule works fine on a plain net 30 invoice. It falls apart when the vendor offers a reward for paying early.
His paint distributor's invoices all said the same thing at the bottom: 2/10 net 30. Tomas had read those characters hundreds of times. He had never run the numbers on them.
The wake-up call came from his new bookkeeper, who noticed a line on the distributor's year-end statement. It listed "discounts available" at $10,080 and "discounts taken" at zero.
Reading the terms
The shorthand has three parts, read left to right.
| Part |
Meaning |
| 2 |
Discount percentage off the invoice total |
| 10 |
Days from the invoice date to qualify |
| net 30 |
Full balance due 30 days from the invoice date |
You'll also see it written as 2/10, n/30. Both windows count calendar days from the invoice date unless the contract says otherwise.
On a $42,000 invoice, paying by day 10 means sending $41,160. Paying on day 30 means sending the full $42,000. The difference is $840 a month, or $10,080 a year.
If the invoice includes sales tax, check whether the 2% comes off the full total or only the pre-tax amount. The vendor agreement should spell it out.
The hidden interest rate
Skipping the discount is a form of borrowing. Every month, Tomas was holding onto $41,160 of his vendor's money for 20 extra days and paying $840 in interest for the privilege.
Accountants convert that into an annual rate with one formula.
Cost of forgoing the discount = Discount % ÷ (100% − Discount %) × 365 ÷ (Net days − Discount days)
Redline: 2 ÷ 98 × 365 ÷ 20 = 37.2% a year
That's a simple annual rate of 37.2%. If you treat each month's invoice as a fresh 20-day loan and compound it, the effective rate climbs to about 44.6%. That's higher than the APR on almost any business credit card in the country.
Running the comparison
Tomas had a $75,000 revolving line of credit at his bank, priced at 9% interest. He had barely touched it in two years.
The decision rule is simple. If borrowing the money to pay early costs less than the discount, take the discount.
Interest on the line = $41,160 × 9% × 20 ÷ 365 = $203
| Option |
Cost per
month |
Cost per year |
| Pay on day 30; skip the discount. |
$840 |
$10,080 |
| Draw on the line, pay on day 10 |
$203 |
$2,436 |
| Net savings from paying early |
$637 |
$7,644 |
Even borrowing at 9%, Redline comes out $7,644 a year ahead. In months when the operating account has spare cash, the full $840 drops straight to profit. And interest on a revolving line only accrues while the balance is outstanding, so once customer payments land and Tomas pays the line down, the cost stops.
How it hits the books
Under the gross method, the purchase goes on the books at the full invoice amount. The discount appears only if Tomas pays in time.
| Event |
Debit |
Credit |
| Receive paint and parts. |
Inventory $42,000 |
Accounts Payable: $42,000 |
| Pay by day 10. |
Accounts Payable:
$42,000 |
Cash $41,160 and Inventory
$840 |
| Pay on day 30. |
Accounts Payable:
$42,000 |
Cash $42,000 |
Redline runs a perpetual inventory system, so the $840 credit goes straight to Inventory. A business on a periodic system would credit Purchase Discounts, a contra account that reduces total purchases. Either way, cost of goods sold falls and gross margin rises.
Some companies use the net method, which records the payable at $41,160 from day one. If the discount window closes, the extra $840 goes to an expense account called Purchase Discounts Lost. It's less common at small businesses, but it has one real advantage. Every missed discount shows up as its own line on the income statement, where an owner will actually see it.
The view from the other side of the invoice
The same math works against you when you're the seller. Offering 2/10 net 30 on your own invoices means paying a 37.2% annual rate to collect your cash 20 days sooner.
That can still make sense in one situation. If your customers on net 30 usually pay on day 60, a discount that moves them to day 10 buys you 50 days. The rate drops to about 14.9%. For a customer who already pays on time, shorter terms like net 15 cost you nothing at all.
What Tomas changed
Redline now runs payables twice a week. The bookkeeper sorts open invoices by discount deadline, pays every 2/10 invoice by day 9, and sets the accounting software to flag any discount within three days of expiring.
In the first quarter on the new schedule, the shop captured $2,520 in discounts. That covered a full year of paint booth filter service with money to spare.
One practical detail made a difference. The 10-day window starts on the invoice date, not the day the invoice shows up. His distributor used to mail invoices three days after shipping, which quietly cut the window to seven days. Tomas asked for emailed invoices and got those days back. He also learned that some vendors accept a discount taken on day 12 as goodwill, while others bill the difference. The safe habit is to treat day 10 as a hard deadline.
His father's rule kept cash in the bank as long as possible. Tomas still follows it, with one exception. When a vendor pays 37% a year to get its money early, the cash goes to the vendor.
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P.S. Offering credit terms comes with a second risk: some customers never pay at all. Tuesday's issue covers how accountants book money they already know they'll never collect.
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