How Paycheck Taxes Work in Arizona
How paycheck taxes work in Arizona: Your employer withholds federal income tax based on your W-4, then Arizona state income tax using state withholding tables. Social Security (6.2%) and Medicare (1.45%) are also deducted from each paycheck. Arizona's flat tax simplifies the withholding process for employees and employers alike. Taxable income is calculated by taking gross wages and subtracting personal exemptions and deductions claimed on Form A-4. This streamlined approach ensures that taxpayers across different income levels are treated consistently by the state's revenue department.
Arizona State Tax Information
Arizona has transitioned to a flat state income tax system, applying a consistent 2.5% rate to all taxable income.
Arizona's flat tax simplifies the withholding process for employees and employers alike. Taxable income is calculated by taking gross wages and subtracting personal exemptions and deductions claimed on Form A-4. This streamlined approach ensures that taxpayers across different income levels are treated consistently by the state's revenue department.
Arizona is a better state to model carefully when you are comparing job offers, relocations, or remote-work options because state withholding can materially change annual take-home pay.
Federal Income Tax
Federal income tax uses progressive brackets: higher income is taxed at higher rates, not all at one rate. The standard deduction reduces taxable income before brackets apply, and your W-4 affects how much is withheld through the year.
Social Security
Social Security tax (FICA) is 6.2% of wages up to the annual wage base ($184,500 in 2026). Both employee and employer pay this amount; this calculator shows the employee portion.
Medicare
Medicare tax is 1.45% on all wages with no cap. High earners pay an additional 0.9% on wages above $200,000 (single) or $250,000 (married filing jointly).