Hopefully, you reported the non-deductible Traditional IRA contribution on your 2021 tax return showing that you have $3000 basis in the Traditional IRA. This would be shown on Form 8606 for 2021.
You will need to enter the basis of the Traditional IRA into your 2023 return so that only the earnings portion is taxed due to the conversion to the Roth IRA. After you have entered the Form 1099-R reporting the Traditional IRA distribution and conversion to the Roth IRA, there will be follow-up questions that ask if you ever made and tracked non-deductible contributions. This is where the basis information is entered so that only the earnings will be taxed.
If you did not file Form 8606 with your 2021 return when the non-deductible contribution was made, take a look at the information in the following TurboTax help article for some guidance about filing a 2021 Form 8606 on its own to report that basis amount. Click the link for If your conversion contains contributions made in 2022 for 2023. Then follow the instructions for filing a Form 8606 on its own. The instructions are for 2022, but you will be filing 2021 Form 8606.
How do I enter a backdoor Roth IRA conversion?
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