Bottom line: If a company makes $1MM in revenue and pays $1MM in salary, they owe taxes on $800k profit. Yes, this is actually the law now.
surely tax changes come in the form of congressional+presidential bills and amendments
1: https://irc.bloombergtax.com/public/uscode/doc/irc/section_1...
Same thing happened when they restructured tax code to interpret withholdings differently. Everyone saw more on their paycheck temporarily (and they gave speeches about it!) but owed more later if they didn't change their withholdings.