An early payment discount looks trivial on an invoice — a couple of percent for settling within ten days instead of thirty — but converted to an annual rate it is usually one of the most expensive or most lucrative short-term financing decisions a small business makes. The whole question is whether the discount you give up, annualised over the credit days you gain, beats what that cash is worth to you elsewhere.
Turning a discount into an annual rate
Terms such as 2/10 net 30 mean 2% off if the invoice is paid within 10 days, otherwise the full amount is due on day 30. Skipping the discount buys 20 extra days of credit at a cost of 2% of the invoice.
Annualising that cost is a matter of scaling: 2 divided by 98 gives the effective cost over the credit period, roughly 2.041%, and multiplying by 365/20 stretches it across a year to about 37.2%. Very few small businesses can borrow anywhere near that cheaply, which is why the finance rule of thumb is to take a 2/10 net 30 discount whenever cash allows.
The relationship is not linear in the discount alone — the credit window matters just as much. A 1/10 net 60 offer costs about 1.01% over 50 days, an annualised 7.4%, which is comparable to ordinary business borrowing and no longer an obvious win.
Three sets of terms compared
On a 12,000 invoice at 2/10 net 30, paying early saves 240 and costs you the use of 11,760 for 20 days. Against a 9% overdraft, financing that early payment costs roughly 58, so the trade nets about 182 in your favour.
At 1/15 net 45, the same 12,000 invoice saves 120 for giving up 30 days of credit — an annualised cost of about 12.3% for declining it. Worth taking if your cash is idle, marginal if you would need to borrow at 10-12% to do it.
At 0.5/10 net 90, the saving on 12,000 is only 60 while the credit given up is 80 days, an annualised 2.3%. Here the discount is worth less than almost any other use of the money, and the sensible answer is to keep the cash and pay on day 90.
Offering discounts as the supplier
Read the same arithmetic in reverse and a 2/10 net 30 offer is you paying roughly 37% annualised to accelerate your own receivables. That can still be rational when the alternative is invoice factoring or an unarranged overdraft, but it is a costly habit if it becomes standard on every invoice.
Discounts also reset expectations. Clients who take the discount consistently start treating the discounted figure as the price, so the sustainable version is a discount priced into the headline rate rather than carved out of an existing margin.
The cheaper levers usually come first: shorter standard terms, deposits on new clients, milestone billing on long projects, and same-day invoicing after delivery. Each shortens the collection cycle without giving up margin at a double-digit annualised cost.
Late payment law and jurisdiction notes
Discounts are only half the picture; the law in several markets already gives suppliers a remedy for slow payment. UK legislation entitles businesses to statutory interest plus fixed compensation on commercial invoices paid late, and payment terms between businesses are expected to stay within limits set out in that legislation.
The European Union operates a comparable regime under its late payment directive, and many EU jurisdictions cap standard business-to-business terms at 60 days unless a longer period is expressly agreed and not grossly unfair to the creditor.
In the United States there is no equivalent general statute for private contracts, so terms are whatever the contract says, and the federal Prompt Payment Act applies only to invoices owed by federal agencies. That difference is worth remembering before importing a template contract from another market.
Tax treatment of a discount taken or granted differs too: in many VAT systems the discount changes the taxable amount and may require a credit note, whereas US sales tax on services is state-specific. Where the amounts are material, confirm the treatment before applying the discount to the tax-inclusive figure.
Frequently asked questions
- What does 2/10 net 30 mean?
- Take 2% off if you pay within 10 days of the invoice date; otherwise the full amount is due within 30 days. Declining the discount costs about 37% annualised, because 2% buys only 20 extra days of credit.
- How do I calculate the annualised cost of skipping a discount?
- Divide the discount percentage by (100 minus the discount) to get the cost over the credit period, then multiply by 365 divided by the number of extra days gained. For 2/10 net 30 that is 2/98 × 365/20, or roughly 37.2%.
- Should I always take an early payment discount?
- Take it when the annualised cost of declining exceeds your cost of capital and paying early does not leave you short of working capital. A 2/10 net 30 discount almost always clears that bar; a 0.5% discount over a long credit window rarely does.
- Is offering a discount better than charging late payment interest?
- They solve different problems. A discount rewards clients who can pay quickly; statutory or contractual interest penalises those who will not. Many small firms use both — an optional discount for prompt payers and a clear interest clause for overdue invoices.
- Does the discount apply before or after tax?
- Conventionally the discount applies to the net amount and the tax is adjusted to match, which in VAT systems usually means issuing a credit note when the discount is taken. Check the rule for your jurisdiction before applying a discount to a tax-inclusive total.
Sources
- GOV.UK — Late commercial payments: charging interest and debt recovery — Sets out UK statutory interest and fixed compensation available on late business-to-business invoices, and the default payment periods that apply.
- European Commission — Combating late payment in commercial transactions — Summarises the EU late payment rules, including the standard 60-day ceiling on business-to-business payment terms and creditors' entitlement to interest.