Your IRA basis would be the non-deductible contributions you made to your traditional IRA account. That portion of your IRA would not be taxable when you roll it over to the ROTH IRA. Your basis in the IRA at the end of last year and the balance of money in your traditional IRA at the end of this year will allow for the tax free amount of your rollover to the ROTH IRA to be determined, taking into consideration the amount rolled over, as reported on your 1099-R entry. So, changing the value of either number will affect the taxable amount of your rollover.
These questions in TurboTax occur when you answer Yes to the question I made and tracked nondeductible contributions to my IRA.
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