Discounts are the easiest growth lever to pull. They’re also one of the easiest ways to grow revenue while shrinking profit. The difference comes down to one calculation.
The maths most founders skip
Numbers in this example are illustrative.
A product sells for ₹1,000. Product cost is ₹300, and other variable costs are ₹200. Contribution per sale is ₹500, or 50%.
Now offer a 20% discount:
- New price: ₹800
- Contribution per sale: ₹800 – ₹300 – ₹200 = ₹300
You now need to sell ₹500 ÷ ₹300 = 1.67 times as many units, 67% more, just to earn the same total contribution.
The quick formula
Extra sales needed = Discount % ÷ (Contribution margin % – Discount %)
With a 50% contribution margin:
| Discount | Extra sales needed to break even |
|---|---|
| 10% | 25% more |
| 20% | 67% more |
| 30% | 150% more |
| 40% | 400% more |
The deeper the discount, the faster the maths turns against you.
When discounts make sense
- Clearing aged or slow-moving stock, where the alternative is a write-off.
- First-order discounts for products with strong repeat rates, where the discount is really part of your CAC.
- Planned festive campaigns, with stock and margins budgeted in advance.
- Bundles, where a discount increases order value.
When discounts destroy value
- Constant sales, which train customers never to pay full price.
- Discounts on best-sellers that would sell anyway.
- Low-repeat products, where the discount never gets recovered.
- Discounts stacked with marketplace offers and coupons you didn’t plan for.
Smarter alternatives
- Free shipping above a threshold to raise order value.
- Bundles and combos that move more units at a healthy margin.
- Free gifts or samples, which cost you product cost, not the full discount.
- Loyalty rewards that reward repeat customers instead of everyone.
- Early access for your community instead of blanket price cuts.
FAQs
How do I know if a sale was profitable?
Compare total contribution during the sale with a normal period, after all variable costs, and check whether repeat customers came back at full price.
Are first-order discounts worth it?
Only if your repeat rate recovers the discount. Treat it as part of your CAC.
How often should a D2C brand run sales?
There’s no universal rule, but fewer, planned campaigns usually protect margin and brand value better than frequent sales.
Download The D2C Founder’s Cash Flow Checklist to check your margin health before your next sale.
Get the free checklist →Planning a sale? The Financial Arc helps D2C brands model discount impact before campaigns go live.
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