Disappointing.  Thanks for your help!

You can open 2017 in the 2017 program and save it under another name to test in.  There is a What-If worksheet you can use to,plan for 2028.  You always use the prior year to estimate and plan for the next year.

Thank you.  The problem with that is that so many of the tax laws changed.  So the 2017 program will not give me good information for projecting 2018.

You can do that if you used desktop software for 2017--not if you used online software.

The 2017 What-If program has the 2018 option in it ... look again ...