Not really sure. I have regular income from a job and irregular income from a business and investments... It's complicated by inventory, depreciation vs. development costs, overhead and lots of variables in the time, space, cash continuum year to year. It's not third grade math. If it benefits the nation I'm all for it but I strongly believe we need to check government spending and growth or taxation will never keep up.
The plan isn’t going to be detailed enough to get into those sorts of nuances: its a white paper, not a rewrite of the infernal revenue code.
I’d suggest taking your AGI as it is shown on your last tax return. Assume no change. Assume no personal dedux except mortgage interest and charity. Or jusr assume the standard deduction. Assume exemptions stay the same. Then run the math. Apply the rates per the plan. That should give you a fair estimate.
In my case its a 42% reduction. If I only got half that, I’d be delighted.