Does a discount actually make money?
Discounts feel like a growth lever, but they're a margin lever in disguise. The volume you need to make a discount pay off is almost always bigger than people expect.
Skip the math — the free discount impact calculator runs this from your own figures.
Open the free calculator →A discount comes out of profit, not price
When you cut a price, your cost doesn't change — so the entire discount comes out of your profit margin. That's why a modest-looking discount can gut your profit per sale.
If you make a 50% margin and offer 20% off, you're giving away 20 of your 50 margin points — roughly 40% of your profit on every unit. The headline discount and the profit hit are not the same size.
The break-even volume formula
To keep the same total profit after a discount, you need enough extra sales to make up for the thinner margin. The extra volume needed is: (old profit per unit ÷ new profit per unit) − 1.
Example: a $100 product at 50% margin makes $50 profit. At 20% off, it sells for $80 and makes $30. You'd need $50 ÷ $30 − 1 ≈ 67% more sales just to break even — far more than the 20% discount suggests.
Lower margins make it far worse
The thinner your margin, the more brutal the math. On a 30% margin, a 20% discount can require several times the volume — or be literally impossible if the discount exceeds your margin, meaning you lose money on every sale no matter how many you make.
This is why blanket discounts are so dangerous for low-margin businesses. Know your margin before you ever quote a discount.
When discounts still make sense
Discounts can be worth it — to clear dead stock, win a first purchase from a high-lifetime-value customer, or drive genuine incremental volume you wouldn't otherwise get. The key word is incremental: sales you'd have made anyway at full price are pure margin given away.
Targeted, time-limited, or conditional discounts beat across-the-board price cuts because they capture new demand without discounting everyone.
Decide with the number, not the feeling
Before running any promotion, calculate the break-even volume and compare it to the extra sales you realistically expect. If the promo needs 60% more sales and you expect 15%, it loses money.
The free calculator below shows your profit per sale before and after any discount and the exact break-even volume, so you run promotions that actually add profit instead of quietly draining it.
Questions
Is a discount the same as a markdown?
In everyday use they overlap, but there's a nuance: a discount is usually a temporary reduction to drive sales or reward a customer, while a markdown often means permanently lowering the price of stock that isn't selling. Both cut into margin the same way, so the break-even math applies to either — you just apply it once for a markdown and per-promotion for discounts.
Should I discount or add value instead?
Often, adding value protects profit better than cutting price. A bonus item, free shipping, or a bundle can feel as attractive as a discount while costing you less margin, because you give away something at your cost rather than sacrificing full margin points. Run the break-even math on the discount first — if it looks ugly, a value-add is usually the smarter move.