Arizona Income Tax Calculator United States

What the Arizona income tax calculator does

The Arizona income tax calculator estimates the state income tax you owe in Arizona and your income after that tax. Arizona taxes income at a single flat rate, so one rate applies to all of your Arizona taxable income instead of a stack of brackets. The tool takes your federal adjusted gross income, applies the Arizona adjustments and standard deduction, and multiplies the result by the flat rate.

State tax is easy to leave out when you plan a budget or compare a job offer. Seeing the Arizona figure on its own shows how much the state takes and how a raise, a move or a change in filing status would change it.

How Arizona’s flat tax works

Arizona used graduated brackets for many years and has since replaced them with one flat rate. Every dollar of Arizona taxable income is taxed at the same rate, so there is no jump into a higher bracket as income grows. Once you know your Arizona taxable income, multiplying by the flat rate gives your Arizona tax. The rate is stored as a parameter and updated if the state changes it.

From federal AGI to Arizona taxable income

Arizona starts from your federal return:

• It begins with your federal adjusted gross income.
• It adds any Arizona additions to income, items the state taxes even though the federal return may not.
• It subtracts any Arizona subtractions, such as certain retirement income, interest on U.S. obligations, or other state-specific reductions.
• It subtracts the Arizona standard deduction for your filing status.

The result is your Arizona taxable income, the base for the flat rate. Enter additions and subtractions in the advanced options for a more precise estimate, or leave them at zero for a baseline that uses only your AGI and standard deduction.

The Arizona standard deduction

Arizona conforms its standard deduction to the federal one, so the amount depends on your filing status. Single filers and those married filing separately use one figure, married couples filing jointly use a larger one, and head of household falls in between. The amounts are indexed, and the calculator reads the current values from its parameters.

Most Arizona filers take the standard deduction, but you can itemize if your deductible expenses are larger. The tool applies the standard deduction, so if you plan to itemize, treat the result as a starting point and check the difference on your full return.

Why filing status matters

Your filing status sets the standard deduction, which changes your Arizona taxable income and your tax. For couples, filing jointly and filing separately can give different results depending on the mix of incomes, so it can be worth running both.

Reading your result

• Arizona income tax, the amount you owe the state.
• Arizona taxable income, the base after deductions and adjustments.
• The standard deduction applied for your filing status.
• Your effective rate, the share of your Arizona AGI that goes to state tax.
• Your income after Arizona tax.
• Arizona tax per month.

Because the standard deduction lowers your taxable base, your effective rate is always a little below the flat rate. The monthly figure helps with budgeting or with setting aside money for estimated payments.

What you need to enter

• Your federal adjusted gross income.
• Your filing status.
• Any Arizona additions or subtractions that apply to you.

If your income varies through the year, enter your expected annual AGI instead of scaling up a single paycheck, since the deduction and rate apply to the full year. Rates and deductions can change from year to year, so re-run the estimate when your income, filing status or the law changes.

This is general information only and not tax advice. Confirm specifics with the Arizona Department of Revenue or a qualified tax professional.

About This Arizona Income Tax Calculator

Use this Arizona income tax calculator to get an instant, accurate estimate. The figures follow official IRS guidance and every rate and threshold is kept up to date for 2026. Adjust the inputs above to match your situation, or browse all our calculators to plan your next step.