In short: an early-payment discount like “2/10 net 30” looks like a small courtesy, but it works out to an annual interest rate of about 37% paid by you. Before you put one on an invoice, measure how long customers really take to pay and compare the discount with what a bank would charge for the same cash.
Small shop owners who wait on unpaid invoices often reach for the same fix. Offer a little discount for paying fast, and the money arrives sooner. It feels generous and harmless. Two percent is barely a rounding error, right?
Read also: The invoice that empties your account will come from a supplier you already trust · The slow stock on your shelf is a loan you made to yourself at a terrible rate · A 10% discount can need 33% more sales just to stand still
Run the numbers once and it stops feeling harmless.
What “2/10 net 30” actually means
The shorthand says the full amount is due in 30 days, but the customer can take 2% off by paying within 10. In effect you are paying the customer 2% to hand over the money 20 days early. That is a cash discount, and it has a price you can calculate.
The formula is simple: discount divided by (100 minus discount), multiplied by 365 divided by the number of days you gain. For 2/10 net 30 that is 2/98 times 365/20, which comes to roughly 37% a year. A credit card company would blush.
Compare those figures with a business overdraft or a line of credit. In most cases the bank is cheaper, sometimes by a wide margin.
Who takes the discount
Here is the part that hurts. The customers most likely to grab an early-payment discount are the ones with spare cash, and they were usually going to pay on time anyway. You end up giving 2% to your best payers while the slow ones keep paying late. Some of them will even take the discount on day 25 and dare you to argue.
It is the same trap as the shop-wide sale: a 10% discount can force you to sell a third more just to break even, and an early-pay discount quietly eats margin on sales you had already won.
Measure the problem first
Before changing terms, find out how late you really get paid. The standard yardstick is days sales outstanding, or DSO: accounts receivable divided by credit sales, multiplied by the number of days in the period. If you have $50,000 in open invoices and $365,000 in annual credit sales, your DSO is 50 days. On net 30 terms, that means the average customer is three weeks late.
A DSO that creeps up month after month is the early warning sign of the cash-flow trap that closes profitable shops. Track it monthly in a spreadsheet. It takes five minutes.
Cheaper ways to get paid faster
- Send the invoice the same day the work is done, not at the end of the month.
- Put the due date as a calendar date, not “net 30”.
- Add a payment link so customers can pay by card or bank transfer in one click.
- Ask for a deposit on large or custom orders before you start.
- Send a polite reminder three days before the due date and again on day one of lateness.
- Keep a short list of chronic late payers and move them to upfront payment.
None of these cost you a percentage of revenue. Most of them cut DSO by a week or more on their own.
When a discount still makes sense
There are honest exceptions. If you are about to miss payroll and the bank has already said no, 37% for a few weeks may beat the alternative. The same goes for a one-off customer you suspect will never pay at all. Use the discount as a targeted tool for a specific invoice, then take it off.
And remember where idle cash hides. Money tied up in slow stock on your shelf is often a cheaper source of liquidity than any discount you could offer.
Open your accounting software today, pull receivables and credit sales for the last twelve months, and calculate your DSO. If it is within ten days of your payment terms, delete the early-payment line from your invoice template.
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