What's the difference between gross and net ROI for discounts?
Muhammed Tüfekyapan
Founder & CEO
TL;DR - Quick Answer
Complete Expert Analysis
Gross vs. Net ROI for Discount Campaigns
The most common mistake in discount ROI calculation is using gross metrics - total revenue during discount / total discount cost. This inflates ROI by attributing revenue that would have happened anyway. Net ROI isolates only the incremental impact, giving a true picture of discount profitability.
Gross ROI vs. Net ROI
| Component | Gross ROI Includes | Net ROI Includes |
|---|---|---|
| Revenue | All revenue during discount period | Only incremental revenue vs. baseline |
| Costs | Discount cost only | Discount + incremental fulfillment + higher returns |
| Discount to dedicated buyers | Counted as positive | Counted as pure cost (cannibalization) |
| Resulting metric | Inflated, always looks positive | Realistic, often reveals true performance |
Net ROI Calculation Formula
Net Incremental Revenue = Total discounted revenue - Baseline revenue (what you'd have made without discount)
Total Discount Cost = (Sum of all discounts given) + (Incremental fulfillment cost) + (Higher return cost)
Net ROI = (Net Incremental Revenue - Total Discount Cost) / Total Discount Cost
Practical Example
| Metric | Gross Method | Net Method |
|---|---|---|
| Revenue during campaign | $50,000 | $50,000 |
| Baseline (same period last year) | Not subtracted | $30,000 (subtract) |
| Incremental revenue | $50,000 | $20,000 |
| Discount cost | $7,500 | $7,500 |
| Calculated ROI | 567% (misleading) | 167% (realistic) |
The Cannibalization Problem
Cannibalization - discounting customers who would have bought at full price - is the most significant source of gross-vs-net ROI divergence:
- Industry estimates: 30-50% of discounted purchases in mass campaigns are from buyers who would have paid full price
- Targeted, behavioral campaigns reduce cannibalization to 5-15%
- Exit-intent offers (only triggered when customer is about to leave) minimize cannibalization by design
Growth Suite's Anti-Cannibalization Architecture
Growth Suite's Purchase Intent Prediction identifies dedicated buyers and excludes them from discount campaigns entirely. This structural feature directly improves net ROI by eliminating the biggest source of cannibalization - discounting customers who didn't need a discount to convert. The result is a much tighter gross-to-net ROI gap than broad discount campaigns.
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With over a decade of experience in e-commerce optimization, Muhammed founded Growth Suite to help Shopify merchants maximize their conversion rates through intelligent behavior tracking and personalized offers. His expertise in growth strategies and conversion optimization has helped thousands of online stores increase their revenue.
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