TurboTax needs to know the value of all your IRA accounts at end-year when you take a distribution or convert part of your IRA to a Roth IRA. This is to calculate the basis of the distributed or converted part by applying the pro rata rule.
When your traditional IRA has basis (from the nondeductible contributions) as reported on form 8606, you have to apply a prorated amount of basis to the distributed or converted amount.
Please read this IRS document for more information.
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