Compare a supplier's early-payment discount with the cash it uses

An early-payment discount exchanges a smaller payment now for a larger payment later. Begin with those cash flows, not just the discount percentage. The relevant questions are how much cash must move earlier, how many days earlier it moves and what that funding costs or prevents the business from doing.

ACCA's working-capital guidance explains the effective annual cost of offering or refusing a settlement discount. The same payment difference can be viewed from either side of the invoice. This guide focuses on the buyer's decision and uses invented terms rather than current market rates.

Confirm that the invoice is valid, the discount applies to the relevant amount and the payment can meet the agreed conditions. A discount available only on the merchandise amount may not reduce freight, taxes or other charges. Build the comparison from the actual payable amounts rather than applying a headline percentage indiscriminately.

Suppose a supplier offers a choice: pay $98,000 on day 10 or $100,000 on day 40. Paying early saves $2,000 and advances the payment by 30 days. The period return on the cash used early is $2,000 divided by $98,000, approximately 2.0408%.

Dividing by the $100,000 later invoice amount gives the quoted 2% discount, but it is a different denominator. The financing comparison asks what the business gains relative to the $98,000 actually committed earlier. Keep both the commercial discount and the financing rate labeled so the difference does not look like a calculation error.

The simple annualized equivalent is 2.0408% multiplied by 365 divided by 30, approximately 24.83%. An effective annual equivalent compounds the period factor: ($100,000 divided by $98,000) raised to 365/30, minus one, approximately 27.86%. Neither number means this single invoice produces that percentage of cash over a year.

Assume a hypothetical borrowing option funds the $98,000 for 30 days at a simple annual rate of 12%, using a 365-day basis and no additional fees. Interest is $98,000 × 12% × 30/365, approximately $966.58. The $2,000 discount exceeds that interest by about $1,033.42.

This calculation compares the actual alternatives more directly than placing an effective annual discount rate beside a differently defined loan quote. If the funding includes a draw fee, minimum charge or another changed cost, add it on its actual terms. A small invoice or short advance can be particularly sensitive to a fixed fee.

If cash is already available, identify its relevant alternative use rather than automatically treating its cost as zero. The decision may affect a required operating buffer or another committed payment. Keep those constraints separate from a speculative investment return that the business has no realistic way to earn.

The 30-day interval in the example comes from day 40 less day 10. It does not come from the invoice issue date alone. If the business's actual permissible later payment date differs, recalculate the interval instead of carrying forward the advertised label.

Check what counts as timely payment under the agreed terms: initiation, receipt or another specified event. Bank processing cutoffs and nonbusiness days can affect whether the supplier receives the amount in time. Use the contractual interpretation confirmed by the responsible owner rather than assume that scheduling a transfer secures the discount.

Keep payment uncertainty visible. If the discount will be lost when the transfer arrives late, the early cash commitment may produce no benefit. Resolve avoidable processing problems before making the economic comparison depend on a payment date that operations cannot reliably meet.

Several invoices can each have an attractive individual return while competing for a limited balance. Place their early dates alongside payroll, taxes, debt and other approved obligations. A favorable annualized equivalent does not establish that all discounts can be funded simultaneously.

Where funding is constrained, compare the actual dollar benefit, funding duration and cash required for the feasible set of payments. A large percentage on a small discount may create less total benefit than another opportunity. The selection should respect the dates and conditions, not merely rank every invoice by one rate.

Do not count an undrawn facility as usable cash without checking its availability and conditions. If taking the discount requires a new credit decision, separate that dependency from the invoice economics. The financial comparison should show what is attractive if funding exists and what can actually be executed now.

A returned item, unresolved price error or pending credit can change the amount owed. Confirm the eligible balance before calculating the discounted payment. Paying an incorrect invoice early for a small discount may complicate recovery of a much larger amount.

Record any agreed treatment of partial payments and credits. A supplier may apply the discount only when the qualifying balance is settled in full. The model should not assume proportional eligibility unless the terms support it.

After payment, reconcile the remittance, supplier statement and ledger treatment. A discount booked internally but rejected by the supplier leaves an outstanding balance. Keep the evidence of timely eligible payment so the difference can be resolved from the agreed terms.

For a purchasing budget, apply the discount only to the invoices expected to qualify and be funded early. A 2% offer does not reduce every future unit cost by 2% if only part of the purchase population can use it. Keep the eligible share and payment assumption visible in the forecast.

Save the early and later amounts, dates, funding assumption, fees and realized discount. For repeated suppliers, review whether the process consistently earns the expected benefit and whether funding costs changed. The most useful measure is the net dollar result on the payments actually made.

The annualized rate remains a comparison aid. The cash schedule and verified invoice conditions determine whether that attractive-looking percentage becomes a real saving without disrupting another obligation.