My husband received a bonus (performance based) based off his fourth quarter (9/1 - 12/31/17) earnings. They couldn't even calculate his bonus until Jan 1. We just received a 2017 1099 for this bonus. The bonus check is dated in February of 2018. We cashed it in Feb 2018. Why do they think this is 2017 - this is wrong, correct? We are going to ask for a corrected 1099 but what do I do about the 2017 return? Will the IRS still be looking for this income on our 2017 return?