This calculator estimates your federal, state, and FICA taxes using the 2025 IRS progressive tax brackets and standard deduction for your filing status. Federal tax is calculated bracket by bracket rather than as a flat percentage, which is how the U.S. tax system actually works: only the income within each bracket is taxed at that bracket's rate. State tax is shown as a simplified flat-rate estimate rather than each state's actual bracket structure, so treat the result as a starting point for budgeting, not a substitute for a tax professional or software like a W-4 withholding estimator.