How do I pay taxes on things that I sold that I purchased with cash?

Update: 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... show more 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? My supplier only accepts so I don't have a choice on getting receipts.
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