I am thinking of starting to sell some of my crafts and wanted to know what having a Tax ID Number would do to my taxes for the year. I have friends that sell on Etsy without an ID, but I'd like to 1) be legit, 2) be able to use the discounts for my products. I have a full time job so it wouldn't be a full blown business, just something on the side that I enjoy to do. Anyone have any insight?