Commission fees are only charged on Orders placed while you are subscribed to the Free account. We do not charge commission fees for any upgraded accounts. You can view all subscription options here. The commission fee is calculated based on the Order subtotal, before any discounts, coupon codes, taxes, or shipping fees are applied. 

Based on your Plan, your commission fees would be as follows:
Basic, Plus, Pro, Ultimate: 0%
Studio 60, Studio 80, Studio 120: 0%
Free: 15%

Note: the commission fee rates do not include transaction processing fees charged by third party payment providers (PayPal or Stripe) and are separate from any Cost of Goods Sold if you are using Lab-fulfillment.