Understanding the income tax calculator
The U.S. federal income tax is progressive: income is sliced into brackets, and each slice is taxed at its own rate. A common misconception is that moving into a higher bracket taxes all your income at that rate in fact only the dollars inside that bracket are, which is why your effective rate (total tax divided by total income) is always lower than your marginal bracket.
This estimate applies the 2024 brackets and standard deduction for federal tax only. It excludes state income tax, payroll taxes, credits, and most deductions beyond the standard one, so it's a planning approximation rather than a filing figure. The distinction between marginal and effective rates is the key takeaway: your marginal rate guides decisions about earning or deducting one more dollar, while the effective rate reflects your true overall burden.
Results are estimates for education only and are not financial advice.