<prompt> Human: I received a 1,000 bonus on 129. On 1223 I noticed I had received a second 1,000 bonus. I alerted payroll and my boss, today they sent me an email to pay back the gross amount. In reality I received an extra 520. What am I supposed to do here? I paid an extra 480 in deductions.I saw similar threads to this before but they werent much help. Im in Pennsylvania.Assistant: Are you repaying through a deduction on a payroll check? If so it reduces your normal taxes so you come out even. Example: you repay 1000 as a negative wage deduction but it also gives you a tax credit reduces your taxes taken out of your check by 480 so the net amount you pay back is 520.If they are asking you to cut them a check for 1000 that is not correct.Human: They said since it was the end of the year this cant be fixed. I have to repay gross. Once its repaid they will send me an affidavit to sign, and they will then send me a W2-C.  <response>: Ok. Well if you overpaid federal and state taxes then you will be refunded this amount when you file your tax returns. You need to ask your employer to refund your overpaid FICA takes. See this link: 