The verdict in three sentences
A promo code launched without strategy is a subsidy on already-secured sales: it cuts margin without creating volume. Well targeted, it becomes a lever — a minimum-basket promo to raise AOV, a first-order promo for acquisition, a winback promo to reactivate. The core discipline: never drop below a 15 % margin floor and monitor code abuse.
Promo types and their margin impact
Each promo type pursues a specific goal. The trap is applying a universal discount that erodes margin on all customers, including those who would have paid full price.
| Promo type | Target | Intended effect | Margin impact |
|---|---|---|---|
| -10 % first order | New | Acquisition | One-off, controlled |
| Minimum-basket tier | Low basket | +AOV | Neutral to positive |
| Free shipping > threshold | All | +AOV, conversion | Low if threshold set |
| Bundle / lot | Clearance | +volume, +lot margin | Positive |
| Winback code -15 % | Inactive | Reactivation | Targeted, profitable |
| Universal -20 % discount | All | Gross volume | Destructive |
Free shipping above a well-calibrated threshold (e.g. 30,000 FCFA) often raises AOV more than it costs.
Protecting the margin floor and avoiding abuse
Before any promo, compute residual margin after discount, mobile money fees (1.5 to 2 %) and logistics. If it drops below 15 %, the promo is too aggressive or poorly targeted.
| Risk | Symptom | Countermeasure |
|---|---|---|
| Code abuse | Codes shared massively | Limit 1 use/customer, expiry |
| Cannibalization | Loyal customers wait for promo | Reserve for new / dormant |
| Margin erosion | Net margin < 15 % | Minimum-basket threshold |
| Habituation | Flat sales outside promos | One-off, non-recurring promos |
| Fraud | Multi-accounts | Unique number / wallet check |
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Mini case study
Moussa sells electronics in Abidjan, 22 % gross margin. He's torn between a universal -20 % and a -10 % promo conditioned on a 50,000 FCFA basket. The -20 % drops his net margin below 5 % after fees: unsustainable. The tiered -10 % lifts his AOV from 38,000 to 52,000 FCFA, preserves a ~ 11 % net margin, and grows volume: the second scenario protects profitability while boosting sales.
FAQ
Is a universal discount a bad idea? Usually yes: it cuts margin on all customers, including those ready to pay full price. Prefer promos targeted by segment or basket tier.
Which margin floor to protect in 2026? Aim for at least 15 % net margin after discount, mobile money fees (1.5 to 2 %) and logistics. Below that, the promo strains cash flow.
How do I prevent code abuse? Limit each code to one use per customer, add an expiry date and verify the uniqueness of the phone number or mobile money wallet at checkout.
Is free shipping profitable? Yes if conditioned on a well-set basket threshold: it pushes AOV above the threshold and often offsets the shipping cost.
How do I stop loyal customers from waiting for promos? Reserve codes for new and dormant customers, and space out campaigns so your base doesn't get used to skipping full price.
Let's talk about your project. We configure your promo codes to maximize volume without breaking your margin. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
