Yes, you need to complete the 1040-X by amending the tax return for 2020. The IRS will not know exactly what you are amending by filing only the Form 8606. An 8606 does not track the cost basis in a Roth.
Summary of the "Backdoor Roth".
The "Backdoor Roth" does not exist in tax law. It is a procedure used by some to take advantage of a unique part of tax law that allows making a nondeductible contribution to a Traditional IRA when one cannot contribute to a Roth IRA, and the immediately converting the Traditional IRA to a Roth IRA, thereby getting the money into the Roth via "backdoor" tax free.
That "procedure" can only work of all these requirements are met:
- No Traditional IRA account whatsoever can exist (that includes any SEP or SIMPLE IRA accounts) at the start. If existing IRA's contain any before-tax money or earnings then it will be partly taxable.
- The Tradition IRA contributions must be reported on a 8606 form as non-deductible.
- The conversion to a ROTH must be shortly after the contribution to avoid taxable gains.
- The entire Traditional IRA value must be zero that the end of the year of conversion.
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