Invoice payment term calculator — cost of net-30 vs discounts
Net-30 is not free. See what your payment terms really cost you.
Payment terms tie up your cash, and every day without payment has a real cost. This calculator shows how much — in days tied up, effective discount APR, and break-even analysis for early-payment discounts.
The hidden cost of "net 30"
Freelancers rarely think about the cost of their own payment terms until cash runs tight. A $5,000 invoice with net-30 terms ties up $5,000 for an entire month. At 15% annual interest, that month of delayed cash costs roughly $62 in opportunity cost — small in isolation, but compounding across multiple invoices and multiple months, it becomes a significant drain on working capital.
The invoice payment term calculator quantifies that cost in two ways: the number of days your cash is tied up, and the effective annual percentage rate implied by any early-payment discount the client offers.
Why discounts matter more than they look
A 2/10 net-30 discount sounds modest — 2% off if you pay in 10 days instead of 30. But annualised, that 2% discount for paying 20 days early is equivalent to an interest rate of approximately 36.5%. That is almost certainly more expensive than any line of credit you could get, which means the rational financial decision is to take the discount whenever possible.
The calculator converts the discount into an effective APR so you can compare it directly against your cost of borrowing or your investment return. If the discount APR exceeds your cost of capital, taking the discount and paying early is the mathematically superior choice.
When longer terms are justified
Net-60 or net-90 terms are not inherently bad — they are often standard for corporate clients and government contracts. The question is whether the longer terms are compensated in your rate. If a client insists on net-60 while others pay net-30, you should be charging roughly 10-15% more to compensate for the additional two months of working capital you are advancing.
The breakeven field in the calculator shows how many days of delay would make a discount unattractive given your opportunity cost. If your cash could earn 8% annually elsewhere, a discount that effectively costs more than 8% annualised is worth skipping.
The relationship between terms and risk
Longer payment terms also increase the risk of non-payment. A 90-day invoice has three times the exposure window of a 30-day invoice — three times the chance of a dispute, a delayed approval, or a client cash-flow problem materialising before you are paid. Every extra day beyond net-30 should be weighed against both the carrying cost of the receivable and the incremental default risk.
Client screening (the client screening calculator) includes a payment reliability dimension precisely because terms and track record are two sides of the same coin: a client who offers generous terms but has a history of late payment is a double risk.
Frequently asked questions
What is the real cost of net-30 versus net-10 payment terms?
A 2/10 net-30 discount that you decline is equivalent to paying approximately 36.5% annual interest to keep your cash for 20 extra days. That is almost always more expensive than a business line of credit, which is why taking early-payment discounts is usually the mathematically correct decision.
When should I charge more for longer payment terms?
If a client insists on net-60 or net-90 terms while others pay net-30, you should charge a premium — typically 10-15% for net-60 and 20%+ for net-90 — to compensate for the additional working capital you are advancing and the increased risk of late or non-payment.
How do I calculate the effective APR of a discount?
The formula is: (discount percentage / (1 - discount percentage)) × (365 / (terms - discount days)). For a 2/10 net-30 discount, that is (0.02 / 0.98) × (365 / 20) = approximately 37.2% annualised.
Is longer payment terms always worse for me?
Not always — corporate and government clients commonly use net-60 or net-90, and these clients often have lower default risk and higher project values. The tradeoff is between higher certainty of payment and slower cash flow. Factor both the carrying cost and the reduced risk into your decision.
How does payment terms risk relate to client screening?
They are two sides of the same assessment. The client screening calculator evaluates payment reliability (track record of on-time payment) alongside scope stability, lifetime potential, and business alignment. Long terms from a reliable payer are manageable; long terms from a slow payer are a double risk.