<prompt> Human: This week my local radio station was running a contest. I won and it was legit - all information was exchanged in person and I got a T-shirt and a 50 gift card. The catch, though, is that I had to give the last 4 digits of my social security number on the spot. I stupidly gave it to them instead of a fake one. What can I do to protect myself after acting like an idiot?  <response>: Its actually legit.If the sponsor of the sweepstakes gives you more than 600 in prizes in a year, they have to issue you a W-9 and report it to the IRS. If you win more prizes from the same sponsor - they track your name and those last 4 digits and if they add up to 600, you will have to supply the first five digits and sign a W-9 form before you collect the prize that hits the 600 mark.If you win some sweet sweet concert tickets, a beer cooler, a hoodie, and some other stuff from the same place ... you could owe the IRS a few bucks! 