I have an online business on Ebay. I purchase my inventory with cash and make a pretty hefty profit on it. The problem is that I have no idea how to show my proof of how much profit I made since I don t have any receipts of the purchases that I made since i buy my inventory with cash. What can I do to pay taxes for these items that I sell online? Getting receipts is not an option, also I am in the state of New York.