I filed my 2019 return. Then I realized I made a contribution in January 2019 to my Roth IRA that is not allowed (I retired). I had it reversed and learned I have earnings that will bump my tax liability by about $100. I am over 60 so I don't have an early withdrawal penalty.
Is it better to wait until I receive the 1099-R in 2021 or is it better to file an amended return now based on the earnings reported? If I amend now (before April 15), do I create a substitute 1099-R since one hasn't been issued? If I wait until 2021, will the only downside be that I will have to pay interest on the tax underpayment of $100?
