Quick answer
A discount comes straight out of gross profit, so you must sell much more to earn the same money. The extra sales needed equal the discount divided by your gross margin minus the discount. At a 40% margin, a 10% discount means selling a third more just to stand still; a 20% discount means doubling sales. Use discounts deliberately, with a clear goal and an end date.
Key points
- Extra sales needed = discount ÷ (gross margin − discount).
- The lower your margin, the more a discount hurts.
- Discounts train customers to wait for the next one.
- Bundles, added value and payment-timing incentives often beat straight price cuts.
“Ten per cent off” sounds small. On a price tag, it is. On your profit, it can be enormous — because the discount comes entirely out of your margin while all your costs stay exactly where they were.
Why do discounts hurt profit so much?
Take a product selling for $100 with $60 of direct costs. Gross profit is $40 — a 40% margin. Knock 10% off and the price is $90, but costs are still $60. Gross profit falls to $30. You’ve cut the price by 10% and your profit per sale by 25%.
To earn the same $40 total you’d previously made from each sale, you now need to sell 1.33 units. That’s a third more volume — with a third more work, stock and handling — just to stand still.
The table also shows why low-margin businesses should be the most cautious about discounting. The thinner your margin, the steeper the climb in volume needed just to stand still, so a discount that might work for a high-margin service can be ruinous for a reseller.
How much extra do you need to sell?
The formula:
Extra sales needed = discount ÷ (gross margin − discount)
| Discount | 30% margin | 40% margin | 50% margin |
|---|---|---|---|
| 5% | +20% | +14% | +11% |
| 10% | +50% | +33% | +25% |
| 15% | +100% | +60% | +43% |
| 20% | +200% | +100% | +67% |
| 25% | +500% | +167% | +100% |
At a 30% margin, a 20% discount means tripling your sales to earn the same gross profit. Most promotions don’t come close. You can test the reverse — a price rise — in our price-rise calculator.
When does a discount make sense?
Discounts aren’t always wrong. They work when they have a specific job to do:
- Clearing dead stock. Turning slow stock back into cash, even at a thin margin, can beat holding it. See stock and cash flow.
- Filling idle capacity. An empty appointment slot or quiet weekday earns nothing; a modest off-peak price can make it earn something — as long as regular customers don’t simply shift across.
- Winning a strategic first order from a customer likely to buy repeatedly at full price.
- Encouraging early payment — though it’s usually an expensive way to get cash sooner.
Every good discount has a goal, a limit and an end date.
What are the hidden costs of discounting?
- Customers learn to wait. Regular sales teach buyers never to pay full price.
- Brand drift. Constant discounting positions you as the cheap option.
- Staff habits. When team members can discount freely, they will — often to close sales that would have happened anyway.
- Margin creep. Small “just this once” discounts add up across a year.
If discounting has become the way you manage cash flow, it may be time to look at a proper working capital buffer instead. Find out what you might qualify for — no credit check to ask.
What can you offer instead of a straight discount?
- Bundles — pair a high-margin item with a popular one.
- Added value — free delivery above a threshold, extended warranty, priority service.
- Volume pricing — a lower price only when the order size genuinely lowers your cost to serve.
- Loyalty rewards — a credit on the next purchase, which brings the customer back.
- Tiered packages — let price-sensitive customers choose a simpler option rather than discounting your standard one.
These protect your headline price while still giving customers a reason to buy.
How do you keep discounting under control?
- Set a written discount policy: who can discount, by how much, and when.
- Track discounts given as a line in your monthly numbers.
- Review promotions afterwards — did volume really rise enough to cover the lost margin?
Our guide to improving gross profit margin covers discount discipline as one of nine levers.
How do you tell whether a promotion worked?
Review every promotion within a fortnight of it ending. Compare:
- Units sold during the promotion with a normal period of the same length;
- Gross profit earned, not just revenue;
- What happened afterwards — did sales dip because customers bought ahead?
- New customers gained, and whether they came back at full price.
Illustrative example. A homewares store ran 15% off for a week at a 45% normal margin. Sales rose from 300 to 420 units. Revenue climbed, but gross profit per unit fell from $45 to $30 on a $100 item — so gross profit went from $13,500 to $12,600. The shop worked harder for less. At a 10% discount, the same lift in volume would have produced $14,700. The figures are illustrative, but the lesson is common: modest discounts with a clear purpose usually beat deep ones.
Grow on margin, not markdowns
A business that protects its margins builds cash, and cash is what pays for growth — or makes funding comfortable to repay when you need it. If you’re planning a stock buy, a new range or a push into a new market, the right facility can help without resorting to price cuts.
We consider trading businesses for unsecured facilities typically from $5,000 to $500,000, and property-secured loans from $20,000 to $5,000,000. The enquiry doesn’t trigger a credit check, you won’t be sold on to a list of lenders, and a real person reads your details and calls. Please fill the form in accurately so we can suggest the right fit on that first call.
Frequently asked questions
How do I work out how much extra I need to sell after a discount?
Divide the discount percentage by your gross margin percentage minus the discount. With a 40% margin and a 10% discount, that's 10 ÷ (40 − 10) = 0.33, so you need about 33% more sales to earn the same gross profit.
When does discounting make sense?
When it has a clear purpose and a limit: clearing slow or dead stock, winning a strategic first order, filling otherwise idle capacity, or rewarding genuinely early payment. Discounting to match a competitor rarely ends well.
Are early payment discounts worth it?
Sometimes, but they're expensive when you calculate the cost over the few weeks saved. Compare the discount with other ways of bridging cash flow before offering one.
What can I offer instead of a discount?
Added value that costs you less than it's worth to the customer: bundles, extended warranties, priority booking, free delivery above a threshold, or a loyalty reward on the next purchase.