How can I do a test run of my taxes using changes to my income this year? I want to adjust income amounts and vehicle expenses to determine changes I need to make

[ebender]

I am trying to look a different scenarios pertaining to buying a work vehicle opposed to leasing. I made a change from being provided a vehicle, to going with a vehicle allowance.

[longfield1313]

Pretty easy.  Start a new return.  Save it under a different name.   Might even be able to just rename your existing one.  Can just go in and adjust amounts you want on this new return  to see what happens.  Just don't file it.  I realize you are using the 2016 return but it should give you a pretty good idea on 2017 based on current info.