I'm signed up with about as many as roflwofl. I have been shopping for 15 years and all of the companies I signed up with have my SS#. I personally don't like the idea of getting an EIN or TIN. Some shoppers have one and a few companies want shoppers to get one. There has been a lot of discussion about this. Funnyface, if you haven't already done so, go to the "new shoppers" section of the forum. Flash and many other wise sages have posted extremely useful information to help new shoppers understand taxes and other issues. Welcome to the forum!