<prompt> Human: Long story short, I buy and sell products on eBay. I profit about 25 for every product I sell. So if I sold something for 1k, it likely cost me around 750. Is there a way to prove this on my tax forms? Im a college student and have never filed taxes before.  <response>: Track all your expenses:1. Cost of goods you purchase2. Cost of shipping3. Cost of packing materialsAll of those will count against your profit, and lower your taxable income. 