Arizona Payroll Tax Registration for Employers: JT-1, A-4, and UI

Before you issue a first paycheck in Arizona, complete Arizona payroll tax registration by filing Form JT-1, the Joint Tax Application, through AZTaxes.gov. The single form opens both accounts you need: state income tax withholding with the Department of Revenue and unemployment insurance with the Department of Economic Security. There is no fee for the withholding or unemployment portions, and online submissions generate an immediate confirmation you can use as proof of registration while the agencies finish processing.¹²

When Registration Is Required

Two separate obligations trigger registration, and most employers hit both quickly.

For withholding, any employer paying wages for work performed in Arizona must withhold state income tax, regardless of where the business is headquartered. There is no minimum wage threshold and no employee count. One employee working in the state is enough.³

For unemployment insurance, coverage kicks in when your business pays $1,500 or more in total wages during any calendar quarter, or has at least one worker on payroll for any part of a day in each of 20 different weeks within the current or preceding calendar year. The weeks do not need to be consecutive.⁴ A single full-time hire will cross the 20-week mark within about five months, so in practice, if you have employees in Arizona, you need a UI account.

Independent contractors are outside this system. The registration and withholding rules apply to employees only, and the IRS decides classification based on whether the business has the right to control how the work is done, not just the end result.⁵ If you are treating a worker as a contractor but directing when, where, and how the work happens, revisit that call before you skip registration on their account.

What to Gather Before You Start the JT-1

Open the application only after you have all of the following. Missing an item will stall you mid-form.

Your Federal Employer Identification Number (FEIN) from the IRS. In Arizona this doubles as your state withholding ID, so there is no separate state withholding number to wait on later.⁶⁷
Your legal business name, matching the Arizona Corporation Commission or Secretary of State record exactly.
Full names, titles, Social Security numbers, and home addresses for every owner, partner, or corporate officer.⁸
Your Arizona physical business address and a mailing address for tax correspondence.
The date you first hired an employee in Arizona and the date you first paid wages.⁸
An estimate of total annual wages. Arizona uses this figure to assign your initial withholding deposit frequency.

Filing the Joint Tax Application

Form JT-1 is shared by the Department of Revenue and the Department of Economic Security, and it covers transaction privilege tax, withholding, and unemployment insurance on one document. Under the license type section, check the box for Withholding/Unemployment Tax. If you are not selling taxable goods or services, skip the transaction privilege tax sections entirely.¹ The form also asks you to identify your business structure — sole proprietorship, partnership, corporation, LLC, and other options are listed.⁸

Filing Online

The state prefers AZTaxes.gov, and online filing processes faster than paper. You get a confirmation receipt at the end of the session. Save it. That receipt is your temporary proof of registration while both agencies finish their reviews.²

Filing on Paper

If you cannot file online, download the fillable PDF from the Department of Revenue and mail the completed form to the License and Registration Section in Phoenix.⁹ Paper takes longer because staff key the data in by hand. There is no fee for the withholding or unemployment portions. If you also add a transaction privilege tax license on the same form, that carries a $12 state fee per location and a possible municipal license fee of up to $50.¹⁰

What You Receive After Submitting

The two agencies process your application independently and notify you separately.¹¹

On the withholding side, your FEIN is your state withholding ID. Once the Department of Revenue confirms your registration, you can begin withholding from paychecks.⁷

For unemployment insurance, the Department of Economic Security mails a Determination of Unemployment Insurance Liability. It states your UI coverage start date, your assigned tax rate, and your eight-digit Arizona UI employer account number.¹¹ New Arizona employers are assigned a UI tax rate of 2.0% on the first $8,000 in wages per employee for 2026.¹² The rate adjusts over time based on your claims experience.

Set Up Form A-4 With Every New Hire

Arizona uses a flat 2.5% individual income tax rate, and employees pick their own withholding percentage from a fixed list on Arizona Form A-4: 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, or 3.5%.¹³

If a new employee does not submit Form A-4 within five days of hire, you must withhold at 2.0% until they make an election.¹³ The default is 2.0%, not the 2.5% tax rate. Collecting A-4 alongside the federal W-4 on day one prevents the mistake.

Ongoing Filings You Take On

Registration is the start of a filing calendar, not the end of a task.

Withholding Deposit Frequency

Arizona assigns your deposit schedule from your average withholding over the previous four quarters:⁷

Annual if your average is under $200 per quarter.
Quarterly if your average is between $200 and $1,500 per quarter.
Monthly or more frequent if your average is above $1,500 per quarter, matching your federal deposit schedule.

New employers get an initial frequency based on the wage estimate from the JT-1. If that estimate was low, the state may move you to a more frequent schedule once actual numbers arrive.

Annual Reconciliation

File Form A1-R by January 31 for the prior calendar year. The return summarizes total compensation paid and Arizona income tax withheld for each employee, and you must attach copies of all W-2s reporting Arizona wages or Arizona tax withheld. Electronic filing of the W-2 attachments is mandatory.¹⁴

Quarterly UI Reports

Unemployment tax reports are due April 30, July 31, October 31, and January 31 for the preceding quarter. A late report carries a penalty of one-tenth of one percent of the quarter’s total wages, with a $35 minimum and a $200 maximum per delinquent report.¹⁵

New Hire Reporting

Report every newly hired or rehired employee to the Arizona New Hire Reporting Center within 20 days of the hire date.¹⁶ This is a separate obligation from your tax filings and one of the most commonly missed items among small employers.

Penalties for Skipping or Delaying

Two penalty provisions do most of the damage when Arizona payroll obligations slip.

If you withhold Arizona income tax from employees but do not remit it to the Department of Revenue on time, the state can add a penalty of 25% of the amount that should have been paid, absent reasonable cause.¹⁷ Withheld wages are held in trust for the state, and the Department of Revenue does not need to warn you before assessing the penalty. If cash-flow pressure is tempting you to hold a withholding payment, the 25% figure is the reason not to.

On the unemployment side, each delinquent quarterly report draws that one-tenth of one percent penalty on quarterly wages, floored at $35 and capped at $200 per report.¹⁵ Small on any single quarter, but they stack across a year, and repeated delinquency draws closer attention from DES.

1
Arizona Department of Revenue. Joint Tax Application for a TPT License
2
Arizona Department of Revenue. Applying for a TPT License
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Arizona Department of Revenue. Arizona Withholding Tax
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Arizona Legislature. Arizona Code 23-613 – Employer
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Internal Revenue Service. Independent Contractor Defined
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Internal Revenue Service. Get an Employer Identification Number
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Arizona Department of Revenue. Employer Withholding Filing Obligations
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Arizona Department of Revenue. Arizona Joint Tax Application
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Arizona Department of Revenue. Mailing Addresses – Section: TPT License and Registration
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Arizona Legislature. Arizona Code 42-5005 – Transaction Privilege Tax and Municipal Privilege Tax Licenses Fees Renewal Revocation Violation Classification
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Arizona Department of Economic Security. Applying for an Unemployment Insurance Tax Account Number
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Arizona Department of Economic Security. Unemployment Insurance Tax Rate Chart
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Arizona Department of Revenue. Withholding Tax – Individual
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Arizona Department of Revenue. Form A1-R Instructions
15
Arizona Legislature. Arizona Revised Statutes 23-723 – Penalties for Failure to File Reports
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Arizona Department of Economic Security. Employer Requirements – Record Keeping
17
Arizona Legislature. Arizona Code 42-1125 – Civil Penalties Definition