Tax: Income
The income tax is determined by applying multi-tiered tax rates based on income (the rates increase as income rises). The income tax as we know it was instituted in 1913, when the Sixteenth Amendment overturned the Supreme Court's 1895 ruling that outlawed the policy.
Cry Wolf Quotes
[In 1981] we, as a nation, finally recognized that it is patently unfair to take more and more from a worker simply because he or she works harder, or longer, or takes more risk, or displays more innovation.
If once you give the power to the nation to tax all the incomes…you give them the power to tax the states, not out of their existence, but out of their vitality.
[T]here will be no check upon the power of the Populistic States to exempt themselves and make a few Eastern States pay all, or nearly all, the tax.
The present assault upon capital is but the beginning. It will be but the stepping stone to others, larger and more sweeping, till our political contests will become a war of the poor against the rich; a war constantly growing in intensity and bitterness.
Evidence
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Millionaire Migration and State Taxation of Top Incomes: Evidence From A Natural Experiment
The rich did not flee New Jersey wen the state raised tax rates on top earners by 2.6 percentage points.
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Maryland Millionaires Vanish in the Face of Recession, Not Higher Taxes
Maryland's tax increases on the rich did not induce millionaire flight.
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Tax Cuts on the Rich Don't Spur Economic Growth
The Center for American Progress takes apart supply side myths.
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The Number of High-Income Taxpayers Increased Significantly During a Period With 10 Percent and 11 Percent Tax Rates on High-Income Earners
After California raised taxes on the rich, the number of residents in the affected tax brackets rose as well.
Backgrounders & Briefs
Taxes Not Seen as Making the Rich Flee New York
Almost everyone agrees that raising taxes on the rich does not induce mass upper-class migration.

