Arizona Employer Tax Information

To sign up for Square’s online payroll service in Arizona, you must be a registered employer with the Arizona Department of Revenue and the Department of Economic Security, and provide us with your Arizona Unemployment Tax Account Number and your Unemployment Insurance (UI) rate.

Add Your Arizona Payroll Account Numbers to Square Payroll

You must be registered as an employer to have an Arizona Withholding Account Number and an Arizona Unemployment Tax Account Number. These numbers are required so we can make Arizona state tax payments and filings on your behalf.

Don’t Have Your Arizona Tax Account Numbers?

The easiest way to get your Arizona Payroll tax account numbers is by registering online with the Arizona Department of Revenue and the Department of Economic Security. Online registration registers you with both the Department of Revenue and the Department of Economic Security.

After your registration is processed (online processing can take 2-3 weeks), you will receive your eight-digit (XXXXXXXX) Arizona Unemployment Tax Account Number.

If you have already registered, have not yet received your Unemployment Tax Account Number, and it has been more than one month since you registered, please contact the Employer Registration Unit at 602-771-6602.

Your Arizona Withholding Account Number is the same number as your nine digit (XX-XXXXXXX) Federal Employment Identification Number (EIN). This number will auto-populate in the Withholding Account Number field when you enter your EIN during Square Payroll sign up. You must be registered with the State of Arizona Department of Revenue for your EIN to be linked to your Arizona account.

Learn how to locate or obtain an EIN.

Can’t Locate Your Arizona Unemployment Tax Account Number?

To locate your Unemployment Tax Account Number:

• If you’ve filed state payroll tax returns in the past, you can find your Unemployment Tax Account Number on any previously submitted Unemployment Tax and Wage Report (UC-018). The Unemployment Tax Account Number is an eight-digit number in the following format: XXXXXXXX.

• Call the Arizona Department of Economic Security at 602-771-6602.

Add Your Arizona UI Tax Rate to Square Payroll

You must provide your UI Tax Rate when signing up for Square Payroll so we can accurately withhold this tax. To locate your UI Tax Rate:

• If you are a new employer, you will be provided with your UI Tax Rate when you complete the registration process.

• If you are an existing employer, you can find your UI Tax Rate on the Determination of Unemployment Tax Rate (Form UC-603) that the Department of Employment Security mails each January to all registered employees.

• Call the Arizona Department of Economic Security at 602-771-6602.

You are responsible for ensuring Square Payroll has the correct UI Tax Rate for your business. If you need to update your rate, you can do so from the Tax Info tab in your online Square Dashboard.

Review a full list of tax resources for all Square Payroll supported states.

Arizona State Tax Details

Square Payroll processes the following per the frequency below to the listed state agencies: