What people don't realize, is that it's not a tax cut. There is just less money witheld from your paycheck. At the end of the year, you'll still owe the same amount. If you're used to getting a refund, it will be less or you'll have to pay. Since the operating capital comes from the monthly witholding, and that's being cut, you can expect IRS enforcement to be heavy handed, in the extreme, to those who are self employed and to business owners (sorry TAB). All those new IRS employees have to justify their jobs somehow.
What people don't realize is that it's not taxes, the "cut" is in FICA, in other words Social security, it's nothing to do with actual Govt revenues.