You open your affiliate dashboard and the GMV looks great. Orders are coming in, the report looks healthy. Then you check the commission, and it’s way lower than you expected.
If GMV is going up, earnings should go up too, right? Not always. GMV and commission measure different things, and relying on GMV alone can make a campaign look better than it is.
GMV is not your earnings
GMV is the total value of goods sold in a period, though the exact definition varies by platform. Commission is what you earn from the transactions that qualify under the program’s rules.
Say your campaign drives $10,000 in GMV at a 5% commission rate. On paper that’s $500. But that math assumes every order qualifies and the full order value is commissionable. In practice, platforms often calculate commission on eligible product value, not the whole order, and some orders get cancelled, refunded, or excluded. So you could end up with well under $500.
What matters is not how much customers spent, but how much of it actually qualifies.
The commission rate may not apply to everything
Many programs pay different rates by product category, campaign, customer type, or promo period. Some products pay nothing at all. Here’s what that can look like:
Same $10,000 GMV, but $280 instead of $500. If you promote a marketplace with a big catalog, this is worth checking, because a large share of your sales may be coming from low-commission categories. Look at the product mix next to your commission report before you decide to scale.
Orders can look good before they’re validated
Many programs show orders as pending first, then adjust them after validation. Orders can be cancelled, returned, refunded, or rejected. Travel campaigns have the same issue: a booking shows up in the report, but a cancellation can wipe out the commission later.
Say a campaign reports 100 orders worth $8,000. After cancellations, 80 orders are left, worth $6,200 in commissionable value. If you calculate commission from the original $8,000, your estimate will be too high.
When review performance, keep three numbers separate:
Programs use cookie windows, last-click rules, and other conditions to decide who gets paid. Someone could click your link, browse, then buy later through another affiliate’s link, and your campaign gets nothing.
Reporting windows can also differ between clicks, orders, GMV, and approved commission, so you may be comparing numbers that don’t cover the same transactions. A good way to find the leak is to line these up:
Campaign A has the bigger GMV, but it loses money on traffic alone. Campaign B has less GMV and still comes out ahead. If you only looked at GMV, you’d scale the wrong one.
For paid traffic, these are the numbers to watch:
What to check before changing anything
If GMV looks healthy but the commission is disappointing, don't kill the campaign right away. But find out where the gap comes from, in this order:
Final thoughts
High GMV is a good sign, but it doesn’t mean high earnings. The gap usually comes from commission rates, product eligibility, cancellations, attribution, or the cost of your traffic. Sometimes the campaign is working fine and you just need to look past the sales number.
For media buyers, what counts is how much qualifying commission a campaign brings in compared to what you spent to get it.
If GMV is going up, earnings should go up too, right? Not always. GMV and commission measure different things, and relying on GMV alone can make a campaign look better than it is.
GMV is not your earnings
GMV is the total value of goods sold in a period, though the exact definition varies by platform. Commission is what you earn from the transactions that qualify under the program’s rules.
Say your campaign drives $10,000 in GMV at a 5% commission rate. On paper that’s $500. But that math assumes every order qualifies and the full order value is commissionable. In practice, platforms often calculate commission on eligible product value, not the whole order, and some orders get cancelled, refunded, or excluded. So you could end up with well under $500.
What matters is not how much customers spent, but how much of it actually qualifies.
The commission rate may not apply to everything
Many programs pay different rates by product category, campaign, customer type, or promo period. Some products pay nothing at all. Here’s what that can look like:
| Category | GMV | Rate | Commission |
| Category A | $4,000 | 5% | $200 |
| Category B | $4,000 | 2% | $80 |
| Ineligible products | $2,000 | 0% | $0 |
| Total | $10,000 | $280 |
Same $10,000 GMV, but $280 instead of $500. If you promote a marketplace with a big catalog, this is worth checking, because a large share of your sales may be coming from low-commission categories. Look at the product mix next to your commission report before you decide to scale.
Orders can look good before they’re validated
Many programs show orders as pending first, then adjust them after validation. Orders can be cancelled, returned, refunded, or rejected. Travel campaigns have the same issue: a booking shows up in the report, but a cancellation can wipe out the commission later.
Say a campaign reports 100 orders worth $8,000. After cancellations, 80 orders are left, worth $6,200 in commissionable value. If you calculate commission from the original $8,000, your estimate will be too high.
When review performance, keep three numbers separate:
- Reported GMV: the total sales value shown in the report
- Validated GMV: the part that’s still eligible under the program rules, if your network shows it
- Approved commission: the amount confirmed as payable
Programs use cookie windows, last-click rules, and other conditions to decide who gets paid. Someone could click your link, browse, then buy later through another affiliate’s link, and your campaign gets nothing.
Reporting windows can also differ between clicks, orders, GMV, and approved commission, so you may be comparing numbers that don’t cover the same transactions. A good way to find the leak is to line these up:
- Affiliate clicks
- Reported orders
- Attributed orders
- Approved orders
- Commission earned
| Metric | Campaign A | Campaign B |
| GMV | $10,000 | $6,000 |
| Commission earned | $200 | $360 |
| Traffic cost | $250 | $200 |
| Net before other costs | -$50 | +$160 |
| ROI | -20% | +80% |
Campaign A has the bigger GMV, but it loses money on traffic alone. Campaign B has less GMV and still comes out ahead. If you only looked at GMV, you’d scale the wrong one.
For paid traffic, these are the numbers to watch:
- EPC (earnings per click): commission earned ÷ affiliate clicks
- CPA (cost per acquisition): traffic spend ÷ qualifying conversions, using the same conversion definition every time
- ROI: (commission − traffic cost) ÷ traffic cost × 100
What to check before changing anything
If GMV looks healthy but the commission is disappointing, don't kill the campaign right away. But find out where the gap comes from, in this order:
- Commission rules: which products, transactions, and customer types qualify, and whether different rates apply.
- Order status: pending, approved, cancelled, and rejected orders. If the network gives rejection reasons, read them.
- Attribution: cookie window, attribution model, and the dates the report covers.
- GMV by product or category: you may be selling a lot of low-commission items.
- Earnings vs. traffic cost: use approved commission where you can, and remember there’s a delay between a reported order and final validation.
Final thoughts
High GMV is a good sign, but it doesn’t mean high earnings. The gap usually comes from commission rates, product eligibility, cancellations, attribution, or the cost of your traffic. Sometimes the campaign is working fine and you just need to look past the sales number.
For media buyers, what counts is how much qualifying commission a campaign brings in compared to what you spent to get it.
