With all due respect, this post is fairly useless. Boils down to "depending on your situation, you might pay more or less taxes for 2018."
I'm trying to calculate if we need to adjust our withholdings this year. The IRS calculator is unfriendly, as you need to know exactly what you filed. I tried TurboTax's Taxcaster, but for some reason it doesn't pull in the tax information I provided 3 months ago, and expects me to go dig up the same information.
This should be easy for TurboTax and for your customers. Why isn't it?