Suggestion - could TurboTax send its customers a download to compare their 2016 income taxes to those they would incur from the Congressional and Senate tax plans?

[Critter]

Sorry ... that cannot happen ... too many moving parts and not enough time to put together & test such a program.  Most of the changes will not effect the 2017 returns anyway so until something is written into law all you can do is speculate. 

[SweetieJean]

and it costs TT money to program all those changes.

[macuser_22]

Also nobody knows what those tax "plans" will actually be or if anything will get passed this year at all.   And if anything is changed that would affect any 2017 tax forms, the IRS must make the form changes and develop the e-file specifications for the change before TurboTax could do anything.