I’m amending 2021 tax return due to missing 8606 form.
It results an extra income tax (due to pro-rata) so I owe the extra tax to Federal and state(CA).
In this case, is it just to send 1040x,1040,8606 and the amount I owe in 1040x(line20) for the federal and Schedule X (line 7)?
I’m wondering if there is extra penalty since the owed tax supposed to be paid till 04/15/2022 and now it is March, 2024
