Get your taxes done using TurboTax

Check line 20 on Schedule 1 to see if there is an IRA deduction amount listed there. If there is then the $6k is added back as income. if blank, then there should be no added income to report in your return. Please read this Turbo Tax link to make sure you have recorded your full conversion correctly.  Don't miss a step or deviate from the instruction.

Your current 8606 should reflect the basis of the previous year's Roth conversion if you did a Backdoor Roth for year 2022. If not, then you will need to amend your 2022 to reflect the amount of the contribution so that you will the correct basis going forward. You will also need to report this year's Roth contribution on your 8606.  Here is how to report the 8606. As an FYI, Turbo Tax do not generate 8606's automatically. You need to do this on your own.

1. Sign in to your TurboTax account.
2. Open your return, if it isn't already open.
3. Inside TurboTax, search for this exact phrase: IRA Contribution Information.
4. Select the Jump to link in the search results.
5. Proceed through the IRA section, answering questions as you go.
6. Answer Yes when you reach the screen, Any Nondeductible Contributions to Your IRA?
7. Select Continue.
8. We'll generate and fill out the 8606 behind the scenes.

I would suggest that you amend your 2022 return first so that the Basis is properly reported and then report your 2023 contribution.  This way when you add this year's contribution, the basis amount will be shown as $12,000 instead of $6000. Tracking your basis is important and used as a tool when you begin taking retirement distributions especially if you have a mix of deductible and non-deductible retirement distributions. To amend 2022.

To amend your return using Turbo Tax Online.

1. Log into Turbo Tax
2. Select Scroll down Your tax returns & documents in your landing page.
3. Select Amend (change) 2022 return. 

To amend using the 2022 Desktop Software, go to:

1. Federal Taxes
2. Other Tax Situations>other tax forms
3. Amend a return