hullian, if you've indicated that you did a combination of rolling over, converting and cashing out, then entered in the rollover box the amount actually rolled over and TurboTax does not include the remainder of the distribution on Form 1040 line 4b, it seems that you have basis in nondeductible traditional IRA contributions and the taxable amount of the remainder is being calculated on Form 8606 Part I. Make sure that you have clicked the Continue button on the Your 1099-R Entries page, confirmed the amount of basis that you carried in to 2020, the enter your year-end balance in traditional IRAs. Without having entered your year-end balance under these circumstances, the correct taxable amount cannot be calculated on Form 8606.
