A negative income tax system has the same incentive as our current bracketed tax system to earn more money: for every dollar you earn, even if a higher percentage gets taken out on that next dollar, you still have more money now.

It just shifts our brackets down so that you get “negatively taxed” - given money - for the lowest brackets of income. But a person making $100k would still be given say $15k for the first $10k of their income, $5k for next $10k, taxed at 9% for the next $10k, 20% the following $10k, so on and so forth - so that every dollar they make still means more money in their pocket, it’s just a percentage less for the additional dollars as they move brackets. Considering that’s already how it works, it seems no incentive changes would arise for high earners.