The 5% supplier discount that can leave you worse off

AI-generated illustration.

Your supplier offers 5% off if you double the order. The saving is real on the invoice. Whether it is real for the business depends on what happens to the extra stock.

The right comparison is between two ways of meeting the same demand over the same period. Comparing only today's smaller invoice with today's larger discounted invoice leaves out future orders, storage and the possibility that some goods will never sell at the planned price.

Put both buying plans on one page

Take a fictional wholesaler selling 100 units a month. The normal order is 300 units at £10 each, with delivery costing £60. Over six months, two such orders would cost £6,120, assuming the supplier's price and freight charge remain unchanged.

The alternative is 600 units at £9.50, delivered together for £60. That costs £5,760. The apparent saving over the six-month period is £360: £300 on the goods and £60 on one avoided delivery.

That is a useful starting point, but the larger order puts £2,700 more into goods on day one. It also brings the second three months of demand into the warehouse early. The business must decide what that earlier commitment costs and what flexibility it gives up.

Suppose the additional storage and handling attributable to the larger order is £90. The advantage falls to £270 before any cash cost, damage or markdown. If twenty units ultimately need a £15 reduction from the expected selling price, the £300 revenue loss more than erases it. These are illustrative assumptions, not typical wholesale loss rates.

Identify what would make the extra units awkward

Check whether the product is seasonal, date-sensitive or likely to change specification. A plain replenishment item with stable repeat orders is different from a fashion colour or an accessory tied to a particular device model.

Look at the order by variant. The supplier may offer the discount only on a fixed assortment. If half the additional cases are weak sellers, the average monthly sales rate for the whole range will give an overconfident answer.

Customer concentration also matters. Six months of historical sales may depend on one account that has not committed to another order. Ask what demand is actually confirmed and what is merely expected. A recurring pattern is useful evidence, but it is not the same as a customer commitment.

Negotiate the quantity separately from the delivery

The supplier may be trying to reduce production changes, secure predictable volume or clear warehouse space. Those are different objectives. Ask which one the offer is intended to solve.

If predictable volume is the priority, a scheduled commitment with staged deliveries might work for both sides. If the supplier needs the space immediately, it probably will not. Be explicit about when payment becomes due, who holds the stock and whether undelivered quantities can change.

Another option is to combine several fast-moving lines towards the discount threshold. That can be more useful than doubling one product. Check the resulting assortment carefully; adding unrelated stock merely to reach the target recreates the same problem in several boxes.

Set a decision date, not just a quantity

Write down the expected depletion date before accepting the offer. After the first month, compare actual sales with the plan while there is still time to adjust promotion, transfer stock or reduce another purchase.

Record the rejected option as well. If you choose the smaller order, retain the price comparison and assumptions. That makes the decision reviewable if demand later surprises you, rather than allowing hindsight to turn every missed discount into an alleged mistake.

A volume discount deserves a yes when the complete buying plan is better. It deserves a smaller order or a counteroffer when the saving relies on perfect demand, free space and no change of mind. The unit price should start the conversation, not finish it.

For ways to reshape a supplier's minimum order, see making minimum order quantities workable.