Is a supplier's early-payment discount worth taking?
How a manufacturer works out whether a supplier's early-settlement discount is worth taking, and how to record it so the supplier's statement still agrees.
By Achekam · · 5 min read · For Manufacturing businesses in South Africa, Nigeria, Kenya
The packaging supplier's invoice has a line at the bottom: a small discount if you pay within a short window instead of on the usual terms. It looks like free money. The finance manager is less sure. Paying early means the cash leaves the bank weeks sooner, and in a factory where the overdraft is already working hard, that cash has a cost.
The right answer depends on arithmetic, not instinct. A small discount for paying a few weeks early can be worth far more, or far less, than it looks once it is expressed as an annual rate and compared with what your money costs. This article shows how to work it out, what gets in the way of taking good discounts, and how to record a discount so the supplier's statement still agrees with your books.
Turning a discount into an annual rate
ACCA gives a formula for the annual cost of an early settlement discount, seen from the side of the business offering it. From the buyer's side, the same figure is the annual return you earn by taking it:
Annual rate = (1 + D ÷ (100 − D)) to the power of (365 ÷ t), minus 1
Here D is the discount percentage and t is the number of days by which payment is brought forward. Note that t is not the discount window itself; it is the gap between the day you would pay to get the discount and the day you would otherwise pay.
ACCA's worked example uses a 1% discount for paying in 10 days instead of 41. Payment is brought forward by 31 days, and the formula gives an annual rate of 12.6%. That is what the supplier gives up by offering the discount, and what a buyer earns by taking it.
Comparing it with what your money costs
The annual rate on its own means nothing until you compare it with your cost of funds. In ACCA's example, an overdraft costs 9% a year. Because 12.6% is more than 9%, ACCA concludes the supplier should not offer that discount: it is cheaper for the supplier to borrow on overdraft than to pay customers to settle early.
Turn that round for the buyer. If you can pay early from an overdraft costing less than the discount's annual rate, taking the discount makes you money. If the money would otherwise sit in a call account earning less, taking it also makes sense. If paying early would push you over your overdraft limit, or force you to delay paying someone whose terms carry a penalty, the discount may not be worth it at any rate.
ACCA explains that working capital management involves a trade-off between liquidity and profitability, because funds tied up in working capital earn little or no return. An early-payment discount is that trade-off in miniature: profit from the discount on one side, cash in the bank on the other.
A quick decision checklist
- Work out the annual rate using the formula, with t as the days payment is brought forward.
- Compare it with your overdraft rate, or with what the cash earns where it sits.
- Check the cash budget: will paying early leave enough for wages and statutory payments?
- If the rate beats your cost of funds and the cash is there, take it.
When matching slows payment down
Taking a good discount depends on being able to pay quickly. AccountingTools notes that three-way matching is labour-intensive, and that the resulting payment delays can annoy suppliers and stop a business taking early payment discounts.
That is no argument for dropping the match. It is an argument for doing it promptly on suppliers whose discounts are worth having. In Achekam, posting a matched supplier invoice puts it in the ledger as expense, input VAT and trade payables, and the supplier's invoice number stops it being posted twice. Flag suppliers with valuable discounts so their invoices are matched first; matching orders, deliveries and invoices covers the match itself, and tolerances in three-way matching explains how small differences can be handled without holding up payment.
Recording the discount so the balance clears
Suppose the bill is recorded at its full amount, line by line with VAT, as Achekam's supplier bills are. You take the discount and pay the reduced amount. Bills can be paid in full or in parts from a chosen bank account, so paying less than the full amount leaves the bill part-paid, with the discount still showing as owed.
The discount is recorded by a manual journal: debit trade payables and credit a "discount received" income account. Achekam refuses a journal that does not balance or is dated in a closed month, and a posted journal is corrected only by a reversal, so post it in the same month as the payment. Ask your accountant how they want the part-paid bill cleared so that the supplier's account in the payables screen agrees with the ledger. Whether the discount also reduces the VAT you claimed depends on your country's VAT rules; check that with your accountant too.
Checking it on the next statement
ACCA lists the reasons a supplier statement may differ from your own records. They include payments the supplier has not yet received, invoices posted to the wrong supplier, unprocessed credit or debit notes, transposition errors, and discounts not accounted for correctly.
Discounts are a frequent cause. The supplier may not have accepted that you paid inside the window, or may have recorded the discount on a later statement. When the next statement arrives, look for the discount specifically. If the supplier shows the discount amount as still owing, raise it straight away, with your payment date as evidence. Reconciling a supplier statement walks through the full reconciliation.
Run the numbers
ACCA's article on managing accounts receivable sets out the formula and its worked example from the supplier's side. List every supplier that offers an early-payment discount, work out each annual rate, and decide which ones to pay early before the next payment run.
General guidance only, not advice on your own circumstances. Tax and payroll rules change: check the current position with the authority or your adviser.
