Get your taxes done using TurboTax

The taxcaster Gabi mentioned will ask for your 2017 information and will forecast your 2017 tax due or refund, BUT it also includes a column to the right that shows your 2018 tax liability based on the same information.  Until TurboTax updates the taxcaster for 2018 you can enter your 2018 estimates, ignore the 2017 amount, and use the 2018 column.  As a bonus you can see what your tax would have been if the tax law had not passed.