According to HowStuffWorks, “Affiliate programs, also called associate programs, are arrangements in which an online merchant website pays affiliate websites a commission to send it traffic. These affiliate websites post links to the merchant site and are paid according to a particular agreement. This agreement is usually based on the number of people the affiliate sends to the merchant's site or the number of people they send who buy something or perform some other action.
You can make really good commissions from the eBay partner but it depends on the products which you decide to promote. Interestingly the commission levels vary according to where you are in the world not just on the products you decide to promote. One of the great reasons to sign up is that you can earn DOUBLE commissions in your first three months. They offer free to use link generators, ad creatives and widgets for you to promote different eBay items. eBay has over 162 Million active buyers which means there is a great potential to convert your traffic.
Your small business must pay state income tax in the state you operate in. Depending on how your business is organized, you could pay corporate tax or a limited liability company tax in addition to your personal income tax. You may pay taxes in the state the selling company is located in if that state taxes entities who earn money within their borders (even if the earner is located out of state). Your affiliate marketing company is considered a separate entity from the selling company when it comes to figuring state income taxes.