Any money you contribute to a traditional IRA that you do not deduct on your tax return is a “nondeductible contribution.” You still must report these contributions on your return, and TurboTax uses Form 8606 to do so.
You enter your 12/31/2023 basis and any non-deductible contributions for 2024, and this is reported on Form 8606. It is still your responsibility to track your basis contributions; TurboTax just adds what you reported as your 2024 beginning basis to any transactions reported for 2024.
If you didn't have any non-deductible contributions for 2024, keep your last Form 8606 so you'll have those amounts for the next time you do so.
Here's more detailed info on Form 8606.
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