I have had made non-deductible IRS contributions over the years but didn't realized that I should report those contributions on my tax return. That is to say, I didn't file form 8606 before doing my 2019 tax return.
Before I am working on the 2019 return, I decided to fix it. I conducted research on what to do, and I was told that I would only need to send form 8606 without filling out form 1040x for all previuos years. Therefore, in year 2020 (before I filed the 2019 tax return) I submitted the form 8606 (with explanation and supporting docuemnts to show the contribution amounts) to IRS. And then my 2019 return reflected correct contribution basis.
Surprisingly, I received a letter from IRS today saying that they are returning my 8606 form (although I don't see it being included in that letter) and I would need to file 1040x.
Now I am confused. I don't know why IRS would need the 1040x. All my IRS contributions were non-deductible.
Can I ignore IRS? Since the 2019 tax return I submitted last year also already reflect the correct non-deductible IRA contribution basis.
If I do need to file 1040x, do I need to file 1040x for all previous years before 2019?
