Do Influencer Discount Codes Cannibalise Your Margin?

What does it mean for a discount code to "cannibalise" margin?

A discount code doesn't just cost the value of the discount. Pay the influencer a commission on the same sale, and the discount and the commission both draw on the same margin — two deductions on one order, not one. Whether that becomes a real problem isn't about how big the discount "feels"; it comes down to three numbers: your gross margin, the commission rate, and the discount depth. Put those three together and there's a concrete break-even point — a discount depth where the order flips from profit to loss. It can be calculated, not guessed.

The two deductions pulling on the same margin

The full per-order contribution calculation — including cost of goods, payment fees and fulfilment — is already worked through in how much commission should influencers get. Here is the simplified version that isolates exactly when a discount plus a commission tip an order into loss, looking at gross margin alone:

Break-even discount depth = 1 − (1 − gross margin) ÷ (1 − commission rate)

If your actual discount depth sits below this figure, the order is still profitable on cost of goods alone — before payment fees and fulfilment are counted. That's a simplification, not the full picture; the next section shows why fixed per-order costs often move the real line significantly.

The break-even point at different margins and commission rates

The table shows the discount depth at which an order turns unprofitable on cost of goods alone — before any fixed per-order costs are added. The 10–20% commission range matches what the commission article describes as typical for ecommerce.

Reading it: a brand at 40% gross margin paying 15% commission can, in theory, go as deep as a 29.4% discount before the order loses money on cost of goods alone. That's rarely the whole story — see the worked example below.

Worked example: why the real line sits lower

These figures deliberately reuse worked example B from the commission article, so the two articles run the numbers on the same hypothetical brand — this is not a real Make Influence customer case.

The brand runs a 40% gross margin, pays 15% commission on net revenue, and carries DKK 90 of fixed per-order costs (payment and fulfilment) on a DKK 1,000 order:

• At a 15% discount: net revenue DKK 850, cost of goods DKK 600, fixed costs DKK 90, commission DKK 128 → DKK 32 remaining (matches the commission article's own example).
• The simplified table above puts this brand's break-even at a 29.4% discount. But count the fixed DKK 90 — it doesn't shrink just because the discount grows — and the real break-even is 18.8% discount, not 29.4%.
• Why: the fixed DKK 90 has to be covered by an ever-smaller amount as the discount deepens, because commission is charged on the discounted revenue while the DKK 90 stays flat.

In other words: the more of your per-order cost is fixed (payment fees, fulfilment, packaging) rather than variable, the further the real break-even sits below the simplified rule of thumb.

The trap: discounts don't stack in a straight line

A common scenario: the influencer's 15% code gets used alongside a 15% site-wide sale. It's tempting to read that as "15 + 15 = 30% off" — but stacked discounts multiply, they don't add: (1 − 0.15) × (1 − 0.15) = 0.7225, an effective discount of 27.75%, not 30%.

27.75% is still under the simplified 29.4% ceiling from the table above — but well past the real 18.8% break-even for this brand. Run the numbers: DKK 850 × 0.7225 − DKK 690 = −DKK 76 per order. An order that looks safe under the simplified model is actually losing money, because the fixed costs never made it into the calculation.

When is it not cannibalisation at all?

A thin or even negative per-order margin isn't automatically a problem — if the sale is incremental, meaning it wouldn't have happened without the influencer's content. A lost DKK 76 of contribution still beats DKK 0 if the alternative was no sale at all — especially if the customer becomes a repeat buyer and the full value only shows up over time; see are influencer-acquired customers worth more.

What's genuinely cannibalisation is a customer who would have bought at full price anyway, and simply used a code she already had reason to use. The difference can't be read off the order alone — it requires measuring incrementality, for example with a holdout test; see influencer marketing attribution explained for how that's done in practice.

Four ways to protect margin

• Set a ceiling from your own break-even — not a round number like "15% is standard." Run the formula above with your own figures, and build in a buffer: needing to keep at least DKK 50 per order in the example above puts the real ceiling closer to 12.9%, not 18.8%.
• Consider a code with no real discount if the goal is tracking rather than an added purchase incentive — see the option described in discount codes vs tracking links.
• Limit where codes can stack. An expiry date or usage cap stops an influencer code from combining with every future sale unchecked — the same leakage risk is covered in discount codes vs tracking links.
• Consider a hybrid deal. Paying an upfront fee alongside commission lets you keep commission — and the pressure on margin — lower; see upfront vs commission.

Common mistakes

• Adding stacked discounts instead of multiplying them, which understates the real discount depth.
• Forgetting fixed per-order costs (payment, fulfilment) in the break-even calculation, which sets the ceiling too high.
• Using the same discount depth across every influencer tier, even though margin and expected incrementality can differ widely. See worked example: 10 influencers, UGC + commission for how that plays out across a full campaign.
• Confusing "the discount costs money" with "the sale is unprofitable." The first is always true. The second is only true once you're past the break-even point.
• Never measuring incrementality, so never finding out whether the "expensive" orders were lost full-price sales or sales that wouldn't have happened otherwise.

Make Influence's operational perspective

In Make Influence's experience, few brands run this calculation per order — most track a code at the campaign level instead: total revenue against the total discount given. That often hides that some of the best-selling codes are simultaneously the ones losing money per order, because a deep discount is paired with a high commission on a low-margin product. A quick break-even calculation before a code goes live takes under five minutes and can save an entire campaign budget from acting on the problem too late.

FAQ

Is a discount code always a cost to margin?

Yes, if the code carries a real discount. Whether that makes the order unprofitable depends on whether the discount plus the commission together exceed your break-even point.

Are commission and discount the same deduction?

No — they're two separate deductions that both draw on the same margin. They need to be calculated together, not separately.

What if we don't know our fixed cost per order?

Use the simplified table as a provisional ceiling, but expect the real line to sit lower — the more of your cost is fixed rather than variable, the bigger that gap.

Can a negative per-order margin ever make sense?

Yes, if the sale is genuinely incremental and the customer is expected to buy again. That requires actually measuring incrementality and repeat value — not assuming it.

Should discount depth be the same across every influencer tier?

Not necessarily. A discount that's safe at 60% margin can be loss-making at 30% — run the table with your own numbers per product category or campaign.