Yes, if you made non-deductible IRA Contributions that you reported in TurboTax, Form 8606 would be generated for you to track the basis of your IRA, so look for the form the last year you made those contributions.
You can generate a Form 8606 if you made non-deductible contributions in 2024. TurboTax asks for your basis as of 12/31/2023, and you can enter the amount if you know what it is. Here's more info on How to Trigger Form 8606.
If you never converted any of your IRA basis to a Roth, you may not need to amend prior year returns. The IRS will accept a Form 8606 with your current year return with the correct amounts. You can prepare and send in any missing Form 8606's separately.
However, if you took distributions from your IRA, which included some of your basis, look for the last year you took a distribution (1099-R) that reported that. TurboTax would have asked for your basis in that year.
Here's more info on Tracking Non-Deductible IRA Basis.
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