Most brands we audit set their affiliate commission by feel. They look at what competitors offer, land somewhere around 15%, and move on. Then three months later the shop is doing volume and nobody can explain why the P&L got worse.
The problem is that the commission rate is the most visible cost, not the biggest one. Here is the whole stack.
The five costs on every affiliate sale
Platform referral fee. TikTok Shop takes roughly 6% of the item subtotal in the US, with a promotional rate near 3% for new sellers in their first month. Payment processing is bundled in, so there is no separate transaction line.
Affiliate commission. Whatever you set, typically 5% to 25%. This only fires when a creator's tracked link closes the sale. Most categories cluster between 15% and 20% because that is where creators start paying attention.
Samples and shipping. The cost nobody models. If you seed 100 units to get 40 posts and 12 creators who sell anything, the landed cost of all 100 units belongs to the sales those 12 produce.
Returns and chargebacks. Category dependent, but plan for it. Apparel and beauty run high on TikTok because purchase intent is impulsive.
Discounts and coupons. Flash sales, the Shop tab deals shelf, and creator-specific codes all come off the top before any percentage is calculated.
Run the actual numbers
Take a $40 product with a $12 landed cost.
- Revenue: $40.00
- Platform referral at 6%: -$2.40
- Affiliate commission at 18%: -$7.20
- COGS: -$12.00
- Shipping and fulfillment: -$5.00
- Sample cost amortized: -$2.00
That leaves $11.40, or about 28.5% net contribution before ad spend, overhead, or returns. Add a 8% return rate and you are near 22%.
That is a workable business. But run the same math at a 25% commission and a $15 landed cost and you are at roughly 12%, which does not survive a bad month.
The floor that matters
The number to know is your gross margin before commission. If a product sits below 60% gross margin, an aggressive affiliate program will eat the difference and you will scale yourself into a loss. Between 60% and 70%, you can run 15% to 18% commission and stay healthy. Above 70%, you have room to be the most aggressive shop in your category, and that is a real strategic weapon because creators sort by commission.
Two practical moves:
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Do not set one commission rate across the catalog. Set it per product based on that product's gross margin. Your hero SKU with 74% margin can carry 22% and win creators. Your accessory at 48% should not be in the affiliate program at all.
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Use target commission on your top 20 creators instead of raising your open rate. Open rate applies to everyone including the creators who would have posted anyway. Target rates go only to the people actually moving units, which is where the incremental dollar belongs.
Where the leverage actually is
Once the math is right, the lever is not the rate. It is how many creators post per month and how many of those posts are made by creators who have sold your product before. A shop with 40 active affiliates at 16% will beat a shop with 8 affiliates at 25% every time, and it costs less per dollar of GMV.
That is the part most brands underinvest in, and it is most of what we do.
If you want to model your own numbers, we built a free net margin calculator that runs this stack for you.
Want this run for your shop?
Proxera is an authorized TikTok Shop CAP, TAP and TSP. Start with a shop audit and we will show you exactly where your GMV is leaking.
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