At its simplest, a flat tax is X% after $Y income level. 25% over $100k, period, no relevance where the money came from or anything else.
The incentive to go into tax brackets is a moot point, because the incentive is there to stay below the flat level (if it's appreciably high to be still doing okay under it) - or even to hide your income beyond the flat tax level elsewhere. It's no different.
As I said above, the problem becomes marginal valuation of money (marginal tax rates). 25% to $100k earner is different from 25% to $500k earner, is different from $50M earner. Some of that is negated by setting the bar quite high ($100k, as Plato said, or higher even), but then you hit Patrokolos' problem - beyond a certain point (i'd say $25k personal $50-$60k family) you have an issue of fairness, ie why should a $1m earner pay tax and a $90k earner not, even though both have disposable income? But, if you set it at the lower level ($25k per adult, $5k extra per child) then you end up with marginal tax rate issues again, ie 25% of (45k-25k=20k, or 4k) may have a higher marginal value than 25% of (1m=250k).
This is why a flat tax, though 'easier' per se, is not simple policy, and not necessarily a good policy. The current tax code is actually not that complex if you don't want to get into the complex deductions; it takes me <30 minutes to do my taxes each year, and I have no formal training in it.
The incentive to go into tax brackets is a moot point, because the incentive is there to stay below the flat level (if it's appreciably high to be still doing okay under it) - or even to hide your income beyond the flat tax level elsewhere. It's no different.
As I said above, the problem becomes marginal valuation of money (marginal tax rates). 25% to $100k earner is different from 25% to $500k earner, is different from $50M earner. Some of that is negated by setting the bar quite high ($100k, as Plato said, or higher even), but then you hit Patrokolos' problem - beyond a certain point (i'd say $25k personal $50-$60k family) you have an issue of fairness, ie why should a $1m earner pay tax and a $90k earner not, even though both have disposable income? But, if you set it at the lower level ($25k per adult, $5k extra per child) then you end up with marginal tax rate issues again, ie 25% of (45k-25k=20k, or 4k) may have a higher marginal value than 25% of (1m=250k).
This is why a flat tax, though 'easier' per se, is not simple policy, and not necessarily a good policy. The current tax code is actually not that complex if you don't want to get into the complex deductions; it takes me <30 minutes to do my taxes each year, and I have no formal training in it.
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