I spotted the chart below at the Tax Foundation website. It’s compiled from IRS data, and shows the percentage of tax filers who paid zero or negative income tax, going back to 1950. (I added the parts in red, to give it a few reference points.)
Recently, the portion of filers who need pay no income tax has grown to almost one-third of the total. That means those who recently joined those ranks in effect got a 100% (or more) tax cut.
That, I believe, is about as big as a tax cut can get for any given taxpayer.
