A difference in the actual calculations seems unlikely. As far as I know, the same calculation engine is used in all versions of TurboTax and any variation in behavior is likely the result of differences in user entries.
@Evi1anne1 , are some of these In-plan Roth Rollovers (IRRs) in a 401(k), 403(b), 457(b) or the federal TSP? The taxable amount of IRRs is not permitted to be subtracted from MAGI for the purpose of determining the amount one is eligible to contribute to a Roth IRA. Only taxable movement of funds to a Roth IRA are to be subtracted from AGI in the calculation of this MAGI. The taxable movement of funds to a designated Roth account in an employer plan do not get subtracted.
