It's a little vague, but it's in section 7.1 of the terms and conditions..........One difference between this site and a regular auction house, Tinbids has no provisions I could find for collecting sales tax, which suggests that the seller will be liable for paying them rather than the buyer.
I have little faith that any of the commerce flowing through the site will not have to be reported in one way or another. If there is some language regarding this, and I missed it, I'd like to know where to find it.
7.1 The Marketplace is designed solely for the Purpose. The Marketplace does not allow for TinBids or the Seller or Consignor to lease goods to Buyers. Anything You do in contravention of these Marketplace Terms and, specifically, the Purpose, will subject You to removal from the Marketplace entirely at TinBids’ sole discretion. Unless otherwise provided in any Terms of Sale provided by TinBids, all sales are final. TinBids will not be responsible for or involve itself in any disputes between Buyers and Sellers or Consignors or other Users regarding any purchase and sale of goods in the Marketplace. You are responsible for paying all fees and taxes associated with your use of the Marketplace wherever levied or required. Your responsibility includes withholding tax if it applies. TinBids may collect geographical location information to determine your location, which may be used for tax purposes.