You will enter you contribution as mentioned above in your 2020 tax return and get Form 8606 to report your basis.
In 2021 when you get your 1099-R you will enter the conversion like this (pay special attention to steps 7 and 8):
- Login to your TurboTax Account
- 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 "Your 1099-R Entries" screen click "continue"
- Answer "yes" to "Any nondeductible Contributions to your IRA?" since you had a nondeductible contributions in prior years.
- Answer the questions about the basis and value
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