I need to use 2020 AGI for the third economic impact payment since my RMD was waived for that year. 2019 and 2021 AGI will be over the threshold. I have two limited partnerships for which I will not receive a 2020 K-1 until early September 2021, past the Additional Payment Determination Date (APDD), but I have estimates for those K-1s. Should I file before the APDD (8/15/21) and then file a 1040X after the APDD when the official K-1s are received? If the 1040X puts my 2020 income over the threshold, will any of the stimulus payment be clawed back? I assume it would be; otherwise, anyone could file now and then amend post-APDD. Thanks.
