Seller Margin after Affiliate Commission Calculator

Understanding the seller margin after affiliate commission — concept and principle

When you pay affiliates or influencers a percentage of each sale, that commission comes straight out of your margin. This calculator shows what is left per sale and as a percentage of price, so you can decide what commission rate your product can actually support. It works with any currency.

How it is calculated

• Commission per sale = price × commission rate.
• Profit per sale = price − all other costs per unit − commission per sale.
• Margin after commission = profit per sale ÷ price × 100%.

"All other costs" should include product cost, packaging, payment fees, shipping you pay and any other per-unit cost.

The principle

Commission is a variable cost expressed as a share of price, so it reduces margin by exactly the commission rate in percentage points. If your margin before commission is (price − costs) ÷ price, your margin after commission is that figure minus the rate. This also gives the maximum rate you can pay before a sale loses money: the break-even commission rate equals your margin before commission.

Worked example

1. Commission per sale = $60 × 12% = $7.20.
2. Profit per sale = $60 − $35 − $7.20 = $17.80.
3. Margin after commission = 17.80 ÷ 60 = 29.67%.
4. Check: margin before commission is 25 ÷ 60 = 41.67%; minus 12 points gives 29.67%. The break-even commission rate here is 41.67%.

How to read the result

The margin left must still cover fixed costs such as staff, software and rent, plus returns. Compare the result with the margin you earn on direct sales: if affiliates bring new customers who buy again, a lower first-order margin may still be worthwhile. If the result is negative, the commission is higher than your product can afford at this price.

Common mistakes

• Calculating commission on cost instead of on the selling price.
• Forgetting payment processing fees, discount codes given to the affiliate's audience or free shipping.
• Confusing margin (profit ÷ price) with markup (profit ÷ cost).

Frequently asked questions

What is the highest commission I can offer?

Mathematically, your margin before commission. In practice, leave room for fixed costs, returns and the profit you need.

Does a discount code change the result?

Yes. Lower the price to the discounted price; commission is usually calculated on what the customer actually paid.

Is margin the same as markup?

No. A $25 profit on a $60 price is a 41.67% margin but a 71.43% markup on the $35 cost.

Sources: Farris, Bendle, Pfeifer & Reibstein, Marketing Metrics (Pearson) — margins and markups