<prompt> Human: Hey PF,I filed my tax return this year roughly a week ago. I started a new job in early 2017 March in a new trade. I knew that I was going to receive two W2s, one for the new job and one for the job I had left. I filed as soon as I had received both.Yesterday a company that I had left in 2015 sent me another W2 for an amount of 2100 in wages. IIRC it was a bonus for achieving an annual milestone which the employees of the 2015 year got paid out for in early 2016.My question is:What is my best course of action.. if any? I had already received my state return from the filing of this year and I believe federal return is just right around the corner also.Thanks  <response>: The W-2 should have a big ol year written right on the bottom. If it says 2016 you should amend your 2016 return. If it says 2017 you should amend your 2017 return. Considering the timing its very likely to be 2017.Try to find a record of the paycheck deposit to correlate with if you are still unclear. 