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Arizona Taxes: What You Need to Know

Arizona imposes a flat individual income tax rate of 2.5% on all taxable income. Unlike most states, there are no brackets. The rate applies regardless of filing status or income level. It became effective for tax year 2023 and remains in place for 2025 (returns filed in 2026).

Because Arizona uses a flat rate, the only variable that changes your Arizona tax amount is the taxable income figure itself driven by the standard deduction, any income subtractions, and filing status.

Many cities and municipalities in Ohio impose their own local income taxes — Arizona does not have municipal income taxes. Only state and federal withholding apply. Here’s a detailed breakdown of Arizona tax withholding, deductions, and employer obligations.

Arizona Federal Tax Withholding (Arizona Residents)

For federal tax withholding, employers use IRS Form W-4 to determine how much federal income tax to withhold from an employee’s paycheck. This is based on factors such as:

• Marital status
• Number of dependents
• Additional withholding amounts specified by the employee
• Other factors like multiple jobs or deductions

Arizona State Tax Withholding 

For state income tax, Arizona requires employees to complete Arizona Form A-4, which determines how much state tax should be withheld from their paycheck. Arizona does not follow the federal W-4 form for state tax purposes. 

Here are some details about Arizona income tax withholding:

1. New employees must complete Form A-4 within 5 days of starting work.
2. This form determines the amount of Arizona income tax withheld from paychecks.
3. If an employee doesn’t submit Form A-4 within 5 days, the employer must withhold at a 2.0% rate.
4. Employees can request additional withholding on Form A-4.
5. To change withholding amounts, employees can submit a new Form A-4 at any time.
6. Employees should keep a copy of their completed A-4 for personal records.

For tax year 2026, Arizona Form A-4 allows employees to elect withholding percentages of 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, or 3.5% of gross taxable wages, and employees may also request an extra dollar amount to be withheld from each paycheck.

This system allows Arizona employees to control their state tax withholding, with a default rate in place to ensure compliance if paperwork isn’t completed promptly.

Source: ADOR — Individual Income Tax Highlights (Tax Year 2025) | ADOR — Form A-4 (2026) | ADOR — Withholding Tax (Employer Guidance)

FICA & State Insurance Taxes

FICA, or the Federal Insurance Contributions Act, is like a  savings plan for your future. It’s made up of two parts: Social Security and Medicare. Let’s break it down: 

Social Security (6.2%): This is your contribution to the retirement and disability fund. It applies only up to a yearly wage limit. In 2026, the Social Security wage base is $184,500. Earnings above that amount are not subject to Social Security tax.

Medicare (1.45%): This part funds the federal health insurance program for seniors and certain disabled individuals. Medicare tax applies to all wages, with no wage base limit.

Together, these taxes add up to 7.65% of your paycheck. Your employer generally matches this amount. If you are self-employed, you are generally responsible for both the employee and employer portions.

Source: https://www.ssa.gov/people/materials/pdfs/EN-05-10297.pdf

Pre-Tax deductions in Arizona

Standard and Itemized Deductions:

Arizona follows federal guidelines for many common pre-tax deductions that can reduce taxable income. Here are some common examples:

Health Benefits:

• Employer-sponsored health, dental, and vision insurance premiums
• Health Savings Account (HSA) contributions, if paired with a qualifying high-deductible health plan
• Flexible Spending Account (FSA) contributions for medical expenses

Retirement Savings:

• 401(k), 403(b), and 457 plan contributions
• Traditional IRA contributions, in certain cases

Family-Related:

• Dependent Care Assistance Program (DCAP) contributions
• Group-term life insurance premiums, up to applicable limits

Work-Related:

• Commuter benefits and parking reimbursements, if offered by the employer

These deductions can reduce both federal and Arizona taxable income in many cases. While Arizona does not have a separate state-specific payroll withholding system for most of these benefits, it generally aligns with federal treatment for common pre-tax deductions.

Remember, the impact of these deductions can vary based on individual circumstances. For personalized advice, consult a tax professional or payroll advisor.

Source: ADOR — Identifying Other Taxable Income | ADOR — Individual Income Tax Information

Median household income in Arizona

Arizona saw a notable increase in median household income in 2024. The state’s median household income rose from $82,660 in 2023 to $84,700 in 2024, representing a year-over-year increase of $2,040.

This upward trend indicates improving economic conditions for Arizona households, with the typical family seeing a boost in their annual income. The rise of more than $2,000 in just one year suggests positive momentum in the state’s economy and labor market.

Source: https://fred.stlouisfed.org/series/MEHOINUSAZA646N

Arizona Income Tax Rate

1. Flat tax rate: Arizona has implemented a 2.5% flat income tax rate, replacing its previous graduated system.
2. Lowest in the nation: Among the 11 states with flat tax rates, Arizona’s is the lowest.
3. Filing thresholds:
   • Individual: $13,850
   • Married filing jointly: $27,700
   • Head of household: $20,800
4. Part-time residents:

1. Must pay 2.5% on global income while an Arizona resident
2. Also taxed on Arizona-sourced income during non-resident period

5. Exemptions: Some income, like U.S. uniformed services retirement pay, are exempt.

Source: ADOR — Individual Income Tax Highlights (Tax Year 2025) | ADOR — Individual Income Tax Information

Arizona Tax Percentage Table

Arizona Standard Deduction (Tax Year 2025)

This new system simplifies Arizona’s tax structure, applying the same rate to all income levels. It potentially makes Arizona more attractive for high-income earners while maintaining a relatively low tax burden for all residents.

Source: ADOR — Individual Income Tax Highlights (Tax Year 2025) | ADOR — Form 140EZ (Tax Year 2025)

Wrapping Up

Arizona keeps things refreshingly simple with a flat 2.5% state income tax on all income, no matter what you earn or your filing status. It’s actually the lowest flat rate in the country. Employees fill out Form A-4 for state withholding, with rates ranging from 0.5% to 3.5%. Add in your standard federal and FICA withholdings, and that’s pretty much it. No local income taxes to worry about either, which makes payroll straightforward for employers.