Check my math, but if this is valid it would make an effective ad campaign. A vivid way of pointing out just how unfair the GOP tax plan really is?
The average working American has a total tax burden of around 32%. Subtract out the state and local part, and the total federal tax burden is about 22%.  Just over 15% of that is payroll taxes, taken out before they even print your paycheck, and for many working class folks that’s the biggest chunk of their overall tax burden. The GOP would like you to think only about the federal income tax when they talk about taxes, but for the average American worker that’s a very distorted picture.
Now consider Trump’s tax situation. For the one year that we have his tax returns he paid about 25% (about one percent of which is payroll taxes).  But under the GOP tax plan the Alternative Minimum Tax (AMT) is repealed, and that one change would have dropped Trump’s tax bill from 38 million to about 7 million, for a tax burden of about 5%.
Furthermore, the bulk of Trump’s wealth is in the form of unrealized capital gains.The GOP tax plan ends the estate tax but retains the stepped-up basis. Under that change when Trump dies his heirs would pay ZERO taxes on that wealth. The stepped-up basis means that those billions would never be taxed.
Just those two things along make a strong argument that Trump’s total lifetime federal tax burden would be less than that of a typical working American, but most everything else in the tax plan helps him a lot more than it helps his supporters. The special rate on pass-throughs, for example, drops his rate from 39.6% to 25%.
I’d like to see some accounting analysis to estimate Trump’s total lifetime federal tax burden under the GOP bill. With the estate tax repeal on top of everything else I’ll bet it’s well down into the single digits.
And if so, isn’t that a powerful point to make? His supporters might be vaguely in favor of “tax reform” even if they don’t understand the details, but knowing that Trump thinks he should pay a smaller percentage to the government than them, even if they’re barely making it from paycheck to paycheck, might have some punch.
And if Trump denies it, that just reminds everyone that he’s refusing to release his tax returns.