Former employer and I have dispute over how much he has paid me for the year 2012. His calculation and mine are off by around three thousand dollars. I did not want to go through the hassle of dealing with IRS, so I paid all the taxes on the amount of income listed on my 1099. However, I'm thinking about disputing this error. Do I have a case? How should I proceed? Should I write an "official" letter demanding that the employer send me images of canceled checks or other proofs substantiating the amount that was listed on the 1099?I deposit all my pay into my single bank account, so I know how much I got paid.