Unfortunately, when TurboTax prepares Form 8606 Part I in regard to a traditional IRA distribution, TurboTax does not enforce the requirement to enter the year-end balance in traditional IRAs and it's all too easy to bypass the question that asks for it. TurboTax simply treats the missing value as zero, producing an inaccurate tax return when the true value is not zero. Requests that TurboTax flag as an error any missing year end balance when the balance is required for the calculation, even if the balance is zero, have been ignored. Erroneous calculations based on a missing year-end value are deemed to be user error.