You will have to correct the 2020 Form 8606 since you do not have the reported basis and you will have to report the Roth contribution. Please see How do I amend my 2020 return?
If your income is too high you will have to pay the 6% excess contribution penalty for 2020 and 2021. To avoid the 6% penalty for 2022 you can remove the excess contribution with a regular distribution (without earnings or losses) since it is after the 2020 due date.
You can not change the amount on Form 1099-R you only converted amount Y in 2021.
To enter the nondeductible contribution for 2021 to the traditional IRA and report the excess from 2020 on your 2021 tax return:
- Login to your TurboTax Account
- Click on "Search" on the top right and type “IRA contributions”
- Click on “Jump to IRA contributions"
- Select “traditional IRA” and "Roth IRA"
- Answer “No” to “Is This a Repayment of a Retirement Distribution?”
- Enter the amount you contributed to the traditional IRA
- Answer “No” to the recharacterized question on the “Did You Change Your Mind?” screen
- Answer the next questions until you get to “Any Nondeductible Contributions to Your IRA?” and select “No” since you made a contribution to Roth and not to the traditional IRA
- Answer “No” to “Roth contributions”
- Continue till the "Enter Excess Contributions" screen enter the total excess contribution from 2020
- On the “Choose Not to Deduct IRA Contributions” screen choose “Yes, make part of my IRA contribution nondeductible” and enter the amount (if you have a retirement plan at work and are over the income limit it will be nondeductible automatically and you only get a warning and then a screen saying $0 is deductible).
To enter the 1099-R conversion:
- Click on "Search" on the top right and type “1099-R”
- Click on “Jump to 1099-R”
- Click "Continue" and enter the information from your 1099-R
- Answer questions until you get to “Tell us if you moved the money through a rollover or conversion” and choose “I converted some or all of it to a Roth IRA”
- On the "Review your 1099-R info" screen click "continue"
- Answer "No" to "Any nondeductible Contributions to your IRA?"
- Answer the question about the value of all traditional, SEP, and SIMPLE IRAs
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