If you made no excess traditional IRA contribution and made no distributions from a traditional IRA while having basis in nondeductible traditional IRA contributions, TurboTax has no need for this value to prepare your tax return.
TurboTax's guidance is often rather incomplete, as in this case, often leaving out important details that don't apply to the majority of filers. Unless the IRA was inherited from your spouse and you chose to treat it as your own, making it your own IRA, it's not to be included in the total value of your own IRAs when TurboTax asks for this value. If your participate from whom you inherited the IRA had basis in nondeductible traditional IRA contributions, you'll need to include the year-end value of that IRA on a separate Form 8606 prepared outside of TurboTax when determining the taxable amount of a distribution from the inherited IRA.
