<prompt> Human: This week I received a letter from the 401k plan administrator of my previous employer that I was not eligible for a portion of a profit sharing contribution that was provided to me in 2017. The result was an overpayment of approximately 1,200 into my 401k plan at the time in early 2017. To be clear this is not an overpayment in the sense that it exceeds the IRS cap on 401k contributions. Instead its an overpayment where the employer simply put money in that they then realized they shouldnt have.nbsp;Since leaving this job the funds have since been rolled over into my current employers plan. The letter goes on to state that I will need to return the net amount of the overpayment via check, and that I will be issued a 2017 Form 1099-R reporting the overpayment as a taxable distribution, and another Form 1099-R reporting the remainder of the rollover distribution.nbsp;A couple questions that Im seeking input on:1. We have already filed taxes for 2017. Is it recommended to file an amended 2017 return based on this information? 2. In order to retrieve the funds from our current plan we would have to do an early withdrawal which would be taxed at the high penalty rate. Are there any negative implications if we to just pay the 1200 in cash from our savings, rather than withdraw from our current plan in order to avoid the penalties?  <response>: If you have a decent HR deptplan provider at your current job, I suggest showing them the letter and asking if theyd bewilling to join you on a call with your former companys plan provider to sort out the options. Having someone on your side who knows exactly how the other guys messed up and what the options are is better than muddling through it on your own. 