Progressive Tax
A tax system where rates increase as income rises, with higher earners paying a larger percentage. The US federal income tax and most state income taxes use progressive brackets.
A progressive tax system applies higher tax rates to higher levels of income. The US federal income tax is the most prominent example, with seven brackets ranging from 10% to 37% for 2025. Most states with income taxes also use progressive structures, though with varying numbers of brackets and rate ranges.
The key feature of a progressive system is that only the income within each bracket is taxed at that bracket's rate. This means moving into a higher bracket does not retroactively increase the tax on income in lower brackets. The result is an effective tax rate that is always lower than your marginal (highest) rate.
Progressive taxation is based on the ability-to-pay principle — the idea that those who earn more can afford to contribute a larger share of their income. Critics argue it can discourage additional work and investment, while supporters point out it reduces after-tax income inequality. The progressivity of the overall system depends not just on rate structures but also on deductions, credits, and how different types of income are taxed.
How it works
A progressive tax system applies higher rates to higher levels of income, and the US federal income tax is the clearest example, using seven brackets running from 10% up to 37% for 2025. Most states with an income tax also use a progressive structure, though the number of brackets and how quickly rates rise varies considerably from state to state.
You experience progressivity directly on your Form 1040 tax computation, where income is taxed in layers — the first slice of income at the lowest rate, the next slice at the next rate, and so on — rather than your entire income being taxed at whichever bracket it happens to land in. This layered structure is why moving into a higher bracket only raises the rate on the additional income within that bracket, not on everything you earned.
A frequent misunderstanding is thinking that crossing into a higher bracket increases the tax owed on income already taxed in lower brackets — it does not, because only the income within each bracket is taxed at that bracket's rate. This is also why your effective tax rate — total tax divided by total income — is always lower than your marginal, or top, rate under a progressive system. The overall progressivity of a tax system depends on more than just the bracket structure; deductions, credits, and how different types of income, like capital gains, are taxed also shape how much higher earners ultimately pay relative to lower earners.
Example: only the income above each bracket is taxed at the higher rate
A single filer's income rises from $95,000 to $105,000 due to a raise, crossing from one federal bracket into the next higher one.
Only the $10,000 of additional income above the bracket threshold is taxed at the higher marginal rate — the income that was already taxed at the lower rate in prior brackets stays taxed at that lower rate. The raise does not retroactively increase tax on the income earned below the threshold.
Frequently asked questions
Does moving into a higher tax bracket mean all my income is taxed at that rate?
How many federal tax brackets are there?
Do all states use a progressive income tax like the federal system?
Related Terms
Tax Bracket
A range of income taxed at a specific rate. The US uses a progressive system with seven brackets ranging from 10% to 37% for 2025.
Marginal Tax Rate
The tax rate applied to your last (highest) dollar of taxable income. It indicates how much tax you would pay on an additional dollar of earnings.
Flat Tax
A tax system with a single rate applied to all income levels. Several US states use flat income tax rates, including Illinois (4.95%), Colorado (4.4%), and Pennsylvania (3.07%).
Effective Tax Rate
Your total federal income tax divided by your total income, expressed as a percentage. It represents the average rate at which your income is actually taxed.