<prompt> Human: In 2015 I worked as an independent contractor, and made deductions on mileage and car expenses on my tax forms that year. I just received a cp22a form saying I needed to pay 2k before April 16 of this year.I dont have any supporting documentation for the mileage or gas costs at this point from that year I didnt keep any receipts.Does anyone out there have any experience with this or have any advice?  <response>: You should have received at least two notices over the past 6 to 9 months. Did you receive a CP2000 last year about the issue? 