I know you are joking. At least I hope you are joking.
Under the U.S. Tax Code the answer would be .30
Taxpayer A taxes would equal 15,000 = 100,000 * .15
Taxpayer B taxes would equal 15,000.30 = (100,000 * .15) + (1*.30)
Of course that is assuming that the 100,000 and 100,001 are taxable wages and not gross or adjusted gross wages.
Under your tax theory one would be deeply penalized for making one extra dollar.
Immie
This is a
hypothetical situation. The reality is that with the massive amount of tax deductions, credits, loop holes, and shelters available the only person to blame for the $100,001 dollar tax payer paying so much more is... himself. If he wrote a check to a church, he could dip under that level easily.
If you're on the cusp of the bracket, and you end up in the higher bracket, that's your own poor planning. Period.
This reminds of the students that come begging for an "A" when they have an 89%. At some point you have to accept that your own poor planning put you in this mess.
The OP is trying to show that a progressive tax system is unfair... and he may have a case if it weren't for the enormous opportunities out there to encourage people to invest, give, etc, and end up in a lower bracket.