You should have filed Form 8606 each time you made a nondeductible traditional IRA contribution and will have to enter your basis from your last file Form 8606 line 14 during the interview (step 8).
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 “What Did You Do With The Money” and choose “I moved it to another retirement account”
- Then choose “I did a combination of rolling over, converting, or cashing out money.” and enter the amount next to "Amount converted to a Roth IRA account"
- On the "Your 1099-R Entries" screen click "continue"
- Answer "yes" to "Any nondeductible Contribution to your IRA?" if you had any nondeductible contributions in prior years.
- Answer the questions about the basis from line 14 of your 2020 Form 8606 and the value of all traditional, SEP, and SIMPLE IRAs
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