So do it gradually, something like fix all federal income tax rates at current level in 2025; then reduce each tax bracket by a full 1% point per year until the bracket reaches zero.
Outside a constitution amendment, I can not think of any way of keeping future politicians from fucking it up though.
Already happened. They just bury the information, for obvious reasons.
link: https://www.latimes.com/archives/la-xpm-1985-08-27-mn-25260-story.html
I hope this goes viral.