If you’re filling out Arizona Form A-4 and wondering what percentage you should withhold for Arizona taxes, the honest answer is that it depends on your income, deductions, and credits, but most wage earners land somewhere between 1.0% and 2.5%. Arizona lets you choose your own withholding rate from a short list, and the goal is to pick the one that gets closest to your actual Arizona tax bill without over-shooting by much.
The Choices on Form A-4
Arizona’s individual income tax is a flat 2.5% on taxable income.1Arizona Legislature. SB1828 – Senate Fact Sheet – Omnibus; Taxation Withholding is different. On Form A-4, you pick one of seven percentages, and your employer applies it to your gross taxable wages every pay period.2Arizona Legislature. Arizona Revised Statutes Title 43 Section 43-401 – Withholding Tax; Rates; Election by Employee The options are:
- 0.5%
- 1.0%
- 1.5%
- 2.0%
- 2.5%
- 3.0%
- 3.5%
You can also add a flat dollar amount on top of the percentage if none of the rates alone covers what you expect to owe. A 0% election is allowed, but only if you had no Arizona tax liability last year and expect none this year.3Arizona Department of Revenue. Withholding Tax – Individual
If you start a new job and don’t turn in an A-4 within five days, your employer will default you to 2.0%.4Finance & Budget. Understanding Payroll Taxes That default is a reasonable guess for a middle-income single filer, but it’s a guess, not a recommendation.
Why 2.5% Is Usually Too Much
The 2.5% tax rate applies to your taxable income, not your gross wages. Your taxable income is gross income minus the standard deduction (or itemized deductions), and then any credits chip away at the resulting tax. That means your effective rate on gross wages is almost always lower than 2.5%, and withholding the full statutory rate will usually produce a refund.
For tax year 2026, Arizona’s standard deduction is roughly $15,750 for single filers and $31,500 for married filing jointly, with head of household falling in between. Those deductions pull a meaningful slice of your wages out of taxable income before the 2.5% rate ever touches it.
Run the Math on Your Own Numbers
A quick example shows how this works. A single filer earning $60,000 who takes the standard deduction has about $44,250 in Arizona taxable income. At 2.5%, that’s roughly $1,106 in tax. Divide by the $60,000 gross and the effective rate is about 1.84%. Choosing 2.0% on the A-4 would slightly over-withhold; choosing 1.5% would slightly under-withhold. Adding a small fixed dollar amount to a 1.5% election splits the difference.
Account for Credits
Arizona’s Family Tax Credit gives $40 per qualifying household member — yourself, your spouse (unless filing separately), and your dependents.5Arizona Legislature. Arizona Revised Statutes Title 43 Section 43-1073 – Family Income Tax Credit The credit can’t exceed the tax you owe, so it reduces your bill rather than generating a refund on its own. A married couple with two kids trims $160 off their liability, which is enough to shift a borderline withholding choice down a half-point.
Other Arizona credits you expect to claim (charitable contribution credits, dependent care, and the like) have the same effect. The more credits you anticipate, the lower your withholding percentage should be.
Starting Points by Income
Most wage earners under about $50,000 with the standard deduction and no outside income find that 1.0% to 1.5% comes close to their actual tax. Between $50,000 and $100,000, 1.5% to 2.0% usually fits. Above that, or if you have side income with no withholding, 2.5% or higher builds a cushion. These are starting points. The ADOR worksheet included with the Form A-4 instructions walks through the full calculation.
Federal Withholding Is a Separate Form
Your federal W-4 and Arizona’s A-4 don’t communicate. Federal withholding is calculated from filing status, dependents, and adjustments on the W-4; Arizona ignores all of that and uses only your A-4 percentage. If you update one, the other doesn’t move. After a marriage, a new child, or a job change, submit both forms.
Checking and Adjusting Your Election
Your first A-4 is a best guess. Check it against reality a few months in: look at year-to-date Arizona withholding on your pay stub and compare it to a rough estimate of your annual Arizona tax.
Clear signals to adjust:
- Your last Arizona return produced a refund of $500 or more — drop your percentage by half a point or a full point.
- You owed a balance at filing — bump the percentage up, or add a fixed dollar amount.
- You got married or divorced, added a dependent, took a second job, or got a significant raise.
To change it, fill out a new Form A-4 and hand it to payroll. Your employer has to apply the new rate starting with the next pay cycle.4Finance & Budget. Understanding Payroll Taxes
One trap for mid-year hires: the 2.0% default applied to only part of a year’s wages can leave you under-withheld relative to your full-year liability, especially if you already had wages from another Arizona employer earlier in the year.2Arizona Legislature. Arizona Revised Statutes Title 43 Section 43-401 – Withholding Tax; Rates; Election by Employee Run the numbers rather than coasting on the default.
Avoiding an Underpayment Penalty
Arizona can assess a penalty if your withholding plus any estimated payments falls too far short of your actual tax. You’re safe if your payments during the year equal at least 90% of this year’s tax, or at least 100% of last year’s tax.6Arizona Legislature. Arizona Revised Statutes Title 43 Section 43-581 – Payment of Estimated Tax; Rules; Penalty; Forms There’s also a small-balance exception: if your remaining tax after withholding and credits is under $1,000, no underpayment penalty applies. For a typical W-2 employee who picks a reasonable percentage, that $1,000 cushion absorbs most imperfect guesses.
When Form A-4 Isn’t the Right Form
Form A-4 only covers wages. A few situations fall outside it:
- Self-employment, investment, or rental income. You may need to make quarterly estimated payments to ADOR. They’re mandatory when your Arizona gross income tops $75,000 single or $150,000 joint, and your prior-year income also exceeded those thresholds.6Arizona Legislature. Arizona Revised Statutes Title 43 Section 43-581 – Payment of Estimated Tax; Rules; Penalty; Forms
- Pension and annuity payments. Those use Form A-4P, with different defaults and rules.7Arizona State Retirement System. Special Tax Notice Regarding Plan Payments
- Arizona residents paid by out-of-state employers. Form A-4V lets you request voluntary Arizona withholding from an employer that wouldn’t otherwise take it out.
For the rest — anyone picking a number on a standard A-4 for a regular paycheck — the question comes back to the same calculation. Estimate your Arizona tax, divide it by your gross wages, and pick the percentage closest to the result. Adjust after your first full year once you see how the guess landed.