Income Tax Estimator Calculator

About this calculator

Most modern income tax systems, including the US federal system, use a progressive bracket structure, where income is divided into segments (brackets) taxed at increasing rates, so that only the portion of income falling within a given bracket is taxed at that bracket's rate — not the entire income. This is why a taxpayer's marginal rate (the rate applied to their last dollar earned) is always higher than their effective rate (total tax divided by total income), since lower brackets are taxed at lower rates along the way.

Individuals use quick tax estimators like this one for paycheck and budgeting purposes, and to sanity-check withholding or estimated quarterly payments, while the underlying two-bracket simplified model mirrors how real multi-bracket systems work without requiring the full complexity of deductions, credits, and dozens of bracket thresholds.

This calculator takes your income and applies a simplified two-bracket progressive structure to estimate the tax owed, along with your effective rate (average tax burden) and marginal rate (rate on your next dollar earned).