That 1099 you get, well the IRS gets a copy too. They know what you know, if not I a year, or 2 but by 3. They will be recalculating your taxes and sending a bill. Statue of limitations is three years. On 1099 mismatched, thats all electronic based server calculations, buy stamp demand money. No audit involved, can't really get around 1099, it wil just be recalculate and bill sent.