You still haven't told us what TurboTax product you are using. There's no way to literally run the 2017 data through the 2018 program. But if you are using the CD/Download software, you can probably accomplish what you want quickly and simply by using the What-If Worksheet in the *2017* software. Go to forms mode and open the What-If Worksheet. Column 1 is your 2017 data. Check the box at the top to copy column 1 to column 2, and check the box at the top of column 2 to use 2018 tax rates.
