Arizona Payroll Taxes and Withholding Guide (2026)

What Makes Arizona Payroll Different

Federal payroll tax is the same in every state. What changes from one state to the next is the second layer: state income tax withholding, employer unemployment taxes, and any employee social-insurance contributions. Arizona sits at the simpler and cheaper end of that range. Its income tax is a flat 2.5%, the lowest flat rate in the country, and it deducts nothing else from employees: no state disability, no paid family leave, and no employee unemployment.

What is unusual about Arizona is how the tax is withheld. Instead of allowances or a formula, the employee simply elects a withholding percentage on Form A-4. That percentage does not have to match the 2.5% tax rate, and the default for a missing A-4 is 2.0%, which is lower than the tax. An Arizona pay stub therefore has fewer lines than a California or New Jersey stub, but the single Arizona line can be set too low. The federal baseline behind all of this is explained in the how payroll taxes work guide.

Employee Withholding Overview in Arizona

An Arizona employee sees federal taxes and a single flat state income tax line. There is no local wage tax and no state social-insurance deduction. The deductions fall into two groups: federal taxes and Arizona income tax.

The federal lines work identically to any other state. For Social Security, the 2026 wage base is $184,500, after which Social Security stops for the year. Medicare has no cap. The only state line is the Arizona income tax, withheld at whatever A-4 percentage the employee chose. There is no employee unemployment, disability, or family leave line, because Arizona does not levy those on workers.

How Is Arizona Income Tax Withheld?

Arizona's individual income tax is a flat 2.5% for tax year 2023 and beyond. That is the rate that lands on your Form 140 return. But the amount withheld from each paycheck is not calculated from that rate. Instead, Arizona uses an employee-elected percentage on Form A-4, applied flat to gross taxable wages.

Gross taxable wages are your gross pay minus pre-tax items such as a 401(k) deferral or Section 125 health premium, the amount that lands in Box 1 of the W-2. The employee chooses the percentage, so a worker who expects to owe more can pick 2.5% or 3.0%, and a worker who expects a refund can pick 1.5%. The federal Form W-4 sets federal withholding, covered in the W-4 withholding explained guide, while Form A-4 sets the Arizona percentage. Because withholding is chosen rather than computed, the final Arizona tax is reconciled on Form 140.

The Form A-4 Percentage Election

Form A-4 is Arizona's version of the federal W-4, but it is far simpler. There are no allowances to count and no worksheet to complete: the employee just checks one withholding percentage.

Choosing a Rate

All new employees subject to Arizona withholding must complete Form A-4 within five days of hire. The choices are 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, and 3.5% of gross taxable wages. An employee may also request an additional flat dollar amount to be withheld each pay period. The A-4 is given to the employer and is not sent to the Department of Revenue.

The 2.0% Default

If a new hire does not file an A-4 within five days, the employer must withhold at the 2.0% default until the employee elects a different rate. This default is the single most important quirk of Arizona payroll: 2.0% is below the 2.5% flat tax rate, so leaving the default in place can produce a balance due at filing for higher earners. The Arizona paycheck calculator shows the gap between your chosen percentage and the 2.5% liability.

Claiming Exempt

An employee who expects no Arizona income tax liability for the year can elect a withholding percentage of zero on Form A-4, and the exemption must be renewed annually. Reciprocity residents use a different form, Form WEC, to stop withholding.

Why the 2.0% Default Is Not the Same as the 2.5% Tax

This is the trap that surprises Arizona workers most. The 2.5% flat tax and the 2.0% default withholding apply to two different bases. The tax applies to Arizona taxable income, which is income after the standard deduction. The withholding percentage applies to gross taxable wages, before any deduction.

Because the standard deduction shrinks the base the tax is charged on, a 2.0% withholding on gross wages roughly covers the 2.5% tax for lower and middle earners. But the higher the wages, the smaller the standard deduction is in proportion, so at some point 2.0% of gross falls short of 2.5% of taxable income. The break-even wage is where 2.0% of gross equals 2.5% of income after the standard deduction, which works out to five times the standard deduction.

Below the break-even, the 2.0% default slightly over-withholds and you see a small Arizona refund; above it, 2.0% under-withholds and you owe on Form 140. The fix is a single line on Form A-4: elect 2.5% instead of leaving the default. Arizona's standard deduction equals the federal standard deduction, so it steps up each year with inflation ($15,750 single for 2025, $16,100 for 2026).

Arizona Deducts No Employee Disability, Family Leave, or Unemployment

This is where Arizona is simpler than its high-tax neighbors. Some states deduct social-insurance contributions from employee wages. Arizona deducts none.

• No state disability insurance: Arizona has no mandatory short-term disability payroll deduction, unlike California or New Jersey.
• No paid family leave payroll tax: Arizona has not enacted a state-run paid family and medical leave program funded by employee payroll deductions.
• No employee unemployment tax: Unemployment insurance is funded entirely by employers through the Arizona Department of Economic Security. Workers pay nothing toward it, and no unemployment line appears on an employee stub.

The practical result is that the only state deduction an Arizona employee sees is the income tax. That is why an Arizona stub is shorter than a California stub, which carries a state disability line on top of the income tax.

Employer Payroll Obligations in Arizona

Arizona employers carry the federal employer taxes plus the state unemployment contribution. The federal side, covered in the employer payroll tax obligations guide, includes the matching 6.2% Social Security and 1.45% Medicare plus Federal Unemployment Tax (FUTA). On top of that, Arizona adds a state unemployment tax paid entirely by the employer.

Arizona state unemployment tax is assessed only on the first $8,000 of each employee's wages and depends on the employer's reserve-ratio experience with the Department of Economic Security. New employers pay a flat 2.0% for at least two calendar years; experienced positive-rated employers pay roughly 0.03% to 4.18% for 2026, and negative-rated employers pay more. None of this is deducted from employee pay. The combined cost-to-hire can be modeled with the employer payroll tax calculator.

Arizona Has No Local Wage Income Tax

Arizona has no municipal or county wage income tax deducted from employees. A worker in Phoenix, Tucson, Mesa, Scottsdale, or anywhere else in Arizona pays the flat state income tax, but no city or county income tax line.

Arizona cities fund themselves largely through the transaction privilege tax, the state's version of a sales tax, rather than a local income tax. So an Arizona pay stub never shows a local wage line, and its absence is correct, not a payroll error. This is a contrast with states like Ohio or Pennsylvania, where city wage taxes are common.

Arizona Reciprocity: California, Indiana, Oregon, and Virginia

Arizona maintains reciprocal income tax agreements with four states: California, Indiana, Oregon, and Virginia. Under reciprocity, wage income is taxed by the worker's state of residence, not the state where the work is performed.

A resident of one of those four states who works in Arizona files Form WEC, the Employee Withholding Exemption Certificate, with the Arizona employer to claim exemption from Arizona withholding, so their home state's tax is withheld instead. Note that the reciprocity form is the WEC, not the A-4. The certificate must be renewed at the start of each calendar year to confirm the worker still lives out of state. The reciprocity covers wages and salaries only, not business or investment income. When the WEC is missing, both states can end up withholding and the worker files two returns to sort it out.

Arizona Supplemental Wage Withholding

Supplemental wages are payments outside regular salary: bonuses, commissions, overtime, sales awards, and back pay. Arizona withholds income tax on supplemental wages at the same A-4 percentage the employee elected, since Arizona does not publish a separate flat supplemental rate the way the federal system does.

• Arizona income tax on supplemental wages: withheld at the employee's A-4 percentage of the supplemental amount; there is no separate flat state supplemental percentage.
• There are no Arizona disability, family leave, or unemployment employee contributions to apply to supplemental pay, because Arizona does not levy them.
• Federal income tax withholding on supplemental wages is a separate calculation set by the IRS, and Social Security and Medicare still apply under their own rules.

For the federal supplemental math on a bonus, use the Bonus Tax Calculator.

Arizona Filing and Payment Frequency

Arizona employers report and remit withheld income tax to the Department of Revenue. Withholding is filed on a quarterly return, Form A1-QRT, with an annual reconciliation, Form A1-R, and payments are made on a schedule tied to the amount withheld. The federal deposit schedule is covered separately in the payroll tax deadlines guide.

State unemployment contributions are reported and paid separately to the Department of Economic Security on its own quarterly schedule through the Tax and Wage System. New employees must be reported to the Arizona new hire directory shortly after the hire date.

How Take-Home Pay Works in Arizona

The calculation sequence runs from gross pay down to net pay. Arizona income tax is a flat percentage of gross taxable wages set by the A-4, and there are no state social-insurance lines to add.

1. Start with gross wages for the pay period.
2. Apply federal income tax withholding using the Form W-4 and IRS Publication 15-T.
3. Multiply gross taxable wages by the Form A-4 percentage (default 2.0%) for the Arizona income tax, and add any extra flat A-4 amount.
4. Subtract Social Security (6.2%) and Medicare (1.45%) on FICA wages.
5. The remainder is net pay. There are no state disability, family leave, or unemployment deductions to subtract.

To see exact figures for a specific salary, A-4 percentage, and pay frequency, use the Arizona paycheck calculator or the general take-home pay calculator for a full pre-tax benefits stack.

What Arizona Employees Should Check on a Pay Stub

• Arizona income tax line: Confirm Arizona income tax is withheld and check which A-4 percentage is being applied. If you earn above the break-even for your filing status and are on the 2.0% default, consider electing 2.5%.
• No employee contribution lines: There should be no state disability, family leave, or unemployment deduction. If you see one, question it, because Arizona does not levy those on employees.
• No local tax line: Arizona has no city or county income tax, so there should be no local wage line anywhere in the state.
• FICA: Confirm Social Security at 6.2% (until $184,500 of wages for 2026) and Medicare at 1.45% with no cap.
• Reciprocity residents: If you live in California, Indiana, Oregon, or Virginia and filed Form WEC, confirm Arizona income tax is not being withheld and your home state tax is.

What Arizona Employers Should Verify Before Running Payroll

• State registration: Confirm active accounts for Arizona income tax withholding with the Department of Revenue and for unemployment tax with the Department of Economic Security, and check the annual DES rate notice.
• A-4 on file: Collect a current Form A-4 from each employee within five days of hire; without one, withhold at the 2.0% default.
• Correct percentage: Confirm the payroll system applies each employee's elected A-4 percentage to gross taxable wages, plus any extra flat amount.
• Reciprocity: Collect a completed Form WEC from California, Indiana, Oregon, and Virginia residents so Arizona income tax is not withheld from their wages, and renew it each year.
• New hire reporting: Report each new worker to the Arizona new hire directory.

Arizona Payroll Quick Facts (2026)

Frequently Asked Questions