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You should have reported the nondeductible traditional IRA contribution on your 2023 tax return and have a 2023 Form 8606 with a basis on line 14. This basis will have to be entered on your 2024 tax return either in the IRA contribution interview or after you enter Form 1099-R. 

If you didn't report it on your 2023 tax return then you can amend your 2023 return to create the 2023 Form 8606.

To enter the nondeductible contribution to the traditional IRA for 2024 (you should have done the same steps on your 2023 return):

1. Login to your TurboTax Account 
2. Click on "Search" on the top right and type “IRA contributions” 
3. Click on “Jump to IRA contributions"
4. Select “traditional IRA”
5. Answer “No” to “Is This a Repayment of a Retirement Distribution?”
6. Enter the amount you contributed
7. Answer “No” to the recharacterized question on the “Did You Change Your Mind?” screen
8. Answer the next questions until you get to “Any Nondeductible Contributions to Your IRA?” and select “Yes” if you had a nondeductible contribution before this tax year.
9. Enter your basis in the Traditional IRA from your 2023 Form 8606 line 14 (if you had a basis in the prior year)
10. 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 Form 1099-R conversion: 

1. Click on "Search" on the top right and type “1099-R”  
2. Click on “Jump to 1099-R”
3. Click "Continue" and enter the information from your 1099-R
4. 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”
5. On the "Review your 1099-R info" screen click "Continue"
6. Answer "Yes" to "Any nondeductible Contributions to your IRA?" if you had any nondeductible contributions in prior years.
7. Answer the questions about the basis from line 14 of your 2023 Form 8606 and the value of all traditional, SEP, and SIMPLE IRAs

Please be aware some customers experience the issue that they are missing the screen to enter the prior year basis. Please see Why is my backdoor Roth IRA conversion being taxed? to sign up for updates.

@nmanchin 

@ValFL25