Earlier quoted context omitted.
The IRS is not stupid. It's perfectly capable of distinguishing a real business from a dummy business set up just to pay personal expenses. There are all kinds of rules about this sort of thing.
If I own a software business that earns 500k-1m a year, currently, I can organize as an LLC and induce pass-thru income that is taxed marginally at ~50% (federal, state, NYC). If I organize as a C-corp, I pay the corporate rate which is also roughly 40%, and I also get double-taxed on salary and any dividends paid to owners. Under these new rules, if a C-corp gets taxed at 15%, there is a strong incentive to pass all…
Salaries for C-corp employees, including top officers that happen to be major shareholders, are a deductible business expense (well, there may be some issues if they are over $1 million annually, but...), so you only get double taxed on dividends.