I made non-deductible contributions to a traditional IRA then converted to Roth, but I am being taxed on the conversion amount. What does form 8606 have to say so that it is clear the original contribution was nondeductible (after tax)?

[MinhT1]

If your Traditional IRA contains both pre-tax (deductible) and after-tax (nondeductible) contributions before your made the nondeductible contribution, then the pro-rata rule would apply and part of your conversion would be taxable.

Please read this IRS document for more information.

[beansbones91]

My IRA contains ONLY after-tax contributions. 

[DanaB27]

Please review the instructions below on how the enter nondeductible contributions for 2022 and enter the conversion. Please be aware if you had earnings before you converted the funds then these will be taxable.

To enter the nondeductible contribution to the traditional IRA:

1. Open your return
2. Click “Deductions &Credits” on the top
3. Click "I'll choose what to work on"
4. Scroll down to “Traditional and Roth IRA Contributions” and click “Start”
5. Select “traditional IRA”
6. Answer “No” to “Is This a Repayment of a Retirement Distribution?”
7. Enter the amount you contributed
8. Answer “No” to the recharacterized question on the “Did You Change Your Mind?” screen
9. Answer the next questions until you get to “Any Nondeductible Contributions to Your IRA?” and select “Yes” if you had nondeductible contributions before this tax year
10. Enter your basis in the Traditional IRA from your 2021 Form 8606 line 14 if you had a basis in the prior year (or last filed Form 8606).
11. 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: 

1. Click "Federal Taxes" on the top and select "Wages & Income"
2. Click "I'll choose what to work on"
3. Scroll down and click "Start" next to "IRA, 401(k), Pension Plan (1099-R)" 
4. Answer "Yes" to the question "Did You Have Any of These Types of Income?"
5. Click "I'll Type it Myself"
6. Choose "Form 1099-R, Withdrawal of Money from 401(k) Retirement Plans, Pensions, IRAs, etc."
7. Click "Continue" and enter the information from your 1099-R
8. Answer questions until you get to “What Did You Do With The Money” and choose “I moved it to another retirement account”
9. 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"
10. On the "Your 1099-R Entries" screen click "continue"
11. Answer "yes" to "Any nondeductible Contribution to your IRA?" if you had any nondeductible contributions in prior years.
12. Answer the questions about the basis from line 14 of your 2021 Form 8606 (or your last filed Form 8606) and the value of all traditional, SEP, and SIMPLE IRAs