What trade credit really costs
Trade credit feels free because you do not pay interest on the invoice in the same way you would on a loan. But early payment discounts change the math. If you skip a supplier discount, you are effectively paying for the right to hold cash a bit longer. In many cases that hidden cost is far higher than a normal credit line or overdraft.
This calculator compares the value of the discount against your own funding cost. That is the right decision test. If the discount you capture is worth more than the cost of finding the cash early, paying sooner is usually the stronger move. If not, using the full supplier term may be more rational for working capital.
The core formula
Discount value = Invoice amount × Discount rate
Early payment amount = Invoice amount − Discount value
Extra days financed = Net days − Discount days
Implied annual cost of skipping discount = [Discount % ÷ (1 − Discount %)] × [365 ÷ Extra days]
Net value of taking discount = Discount value − Funding cost to pay early − Payment fee
Example: 2/10 net 30 means you can pay 2% less if you pay by day 10 instead of the full invoice by day 30. The financing window is 20 days. That hidden annualized cost is often very high.
How to read the result
| Signal | What it means | Typical action | Risk level |
|---|
| Implied annual rate far above your funding cost | Skipping the discount is expensive | Pay early if cash is available or cheap to fund | Strong early pay case |
| Net benefit from discount is positive | The discount beats your cost of cash | Capture discount consistently | Good |
| Net benefit is near zero | The terms are close either way | Watch liquidity and operational convenience | Neutral |
| Net benefit is negative | Paying early destroys value at current funding cost | Use full term unless other benefits matter | Caution |
| Early pay shortens supplier days too much | Working capital tightens even if discount looks attractive | Balance margin gain against cash cycle pressure | Context dependent |
Frequently Asked Questions
What is a trade credit calculator used for?+
A trade credit calculator helps you decide whether to pay a supplier invoice early to capture a discount or wait until the full net due date. It shows the hidden financing cost of skipping the discount and compares that with your own cost of cash. This is useful for retailers, wholesalers, manufacturers, and any business buying on supplier terms.
What does 2/10 net 30 mean?+
It means you can deduct 2% from the invoice if you pay within 10 days. If you do not pay within 10 days, the full invoice is due by day 30. The real decision is whether saving 2% is worth paying 20 days earlier. In many cases that works out to a very high implied annual financing cost.
Why is skipping a small discount sometimes very expensive?+
Because the saving is earned over a very short period. Giving up a 2% discount to keep cash for only 20 extra days can imply an annualized cost that is far above normal bank funding. The discount looks small on the invoice, but the time window is short, which makes the effective rate much larger than many operators expect.
Should I always take early payment discounts?+
Not always. The right answer depends on liquidity. If taking the discount forces you into much more expensive borrowing or creates a dangerous cash squeeze, using the full supplier term may still be better. The correct comparison is discount value versus your true cost of funding and the effect on your cash conversion cycle.
How does trade credit affect working capital?+
Supplier terms delay cash leaving the business, which supports working capital. Paying early reduces accounts payable days and can tighten liquidity, especially if inventory sits for a while before it sells or if customers take time to pay. That is why a good trade credit decision looks at both margin gain and timing pressure on cash.
What should I do first if the result is unclear?+
Check three things. First, confirm the real funding cost you would use to pay early. Second, check how often invoices like this occur, because small gains compound over a year. Third, look at cash timing, especially inventory and customer collection days. Those three inputs usually decide whether early payment is a smart routine or just a theoretical saving.