Marginal Tax Rate: The tax rate applied to the next dollar of taxable income, which increases as income rises and falls into higher tax brackets.
Effective Tax Rate: The actual percentage of an individual's or business's total income that is paid in taxes, taking into account deductions, credits, and other tax-saving strategies.
Progressive Tax System: A tax system where the tax rate increases as the taxable income increases, with higher-income individuals paying a larger percentage of their income in taxes.