Why do my ClickBank commissions vary ?
Typical affiliate question: I normally receive $20.10 for an affiliate sale but sometimes it’s $19.98 or $19.54. Why is this ?
The answer is that the customer is located in an EU country where VAT needs to be collected. This affects the calculation of commission – you can check with the calculator here
Another circumstance where commission varies is when a vendor has more than one item in his account. Although your customer did not purchase from the usual landing page his affiliate cookie was set which meant that when he found another product you earned the commission.
You can check this by looking at the Transaction report in your ClickBank account and see different Item numbers for the same Vendor.

