I forgot to include a 1099 in 2020 that would have resulted in additional capital losses to be carried forward (I had recognized the $3k max capital loss in 2020, so any incremental loss has no impact on that year's tax obligation). I would like to use this loss in 2021. I have a couple of questions:
1. Do I need to file an amended 2020 return to update Schedule D to capture the incremental carry forward amount given there is no change to the 1040?
2. If yes to 1, do I need to wait until 2020 is accepted to file an amended 2021 return?
