Effective Tax Rate Calculator
Last updated July 2, 2026
The effective tax rate is the most accurate single number for describing what someone actually pays in federal income tax as a percentage of their total income. It's calculated by dividing total federal income tax owed by total gross income — not taxable income — producing a figure that is always lower than the marginal rate and reflects the benefit of the progressive bracket structure. For most middle-income Americans, the effective federal income tax rate runs between 10 and 16 percent despite facing marginal rates of 22 or 24 percent. A household with $100,000 in gross income that owes $14,000 in federal income tax has an effective rate of 14 percent — not the 22 percent marginal rate that dominated the upper portion of their taxable income.
The effective rate calculation is particularly useful for three planning contexts. First, comparing whether a Roth or traditional retirement account contribution makes more sense: contributing to a traditional account saves taxes at the marginal rate, while Roth withdrawals in retirement avoid taxes at the projected future effective rate. If the current marginal rate exceeds the expected future effective rate in retirement, traditional contributions win; if the reverse is true, Roth wins. Second, evaluating tax-loss harvesting: realized capital losses save taxes at the effective rate on ordinary income or the applicable capital gains rate. Third, benchmarking total tax burden across states: adding state income tax to the federal effective rate produces the total effective income tax burden, which varies from zero in states with no income tax to over 30 percent for high earners in California or New York.
The calculation shows your effective federal income tax rate annually alongside your marginal rate. The effective rate is what you actually pay as a share of income; the marginal rate is what additional income or deductions are worth. Both numbers serve real planning purposes, and conflating them leads to overestimates of your tax burden and underestimates of the value of deductions.