Thanks for the reply. I also made mistakes on my 2019, 2020 F8606, mistakenly put balance as total basis (part 1, line 2). I will also amend for those years. My total basis should be zero as I have done backdoor conversion every year. With this, should I request for 2021 extension, wait for IRS to complete the amendment, then file 2021 return ? Or any concern if I go ahead to file 2021 F8606 with zero basis, before the amendments ?
Thanks
