In January 2007, I started selling collectibles on Ebay.  I did better than I expected.  I did all the work myself; ordering the merchandise, placing the ads, shipping the product.  I paid state sales tax quarterly and now I’m filing my first tax return since starting on Ebay.  This is only part-time, I have a full-time job.  I’ve prepared my tax return as I always have, plus I’ve prepared a Schedule C and as Schedule SE to pay the self employment taxes.  But I had a good year, netting about $20,000, and that amount of money has made me nervous.  I have a nagging suspicion that I’ve forgotten something.  Have I?