What actually happens
An employee who lives in Nevada and performs work in Arizona sits in two tax systems at once. The residence state claims the right to tax all of a resident's income wherever earned; the work state claims the right to tax income sourced within its borders. Absent an agreement, both claims stand, and the conflict is resolved after the fact through a credit on the resident return rather than up front in payroll.
When Arizona withholding starts
Arizona applies a de minimis test of 60 working days before nonresident withholding begins. Arizona withholding is not required for a nonresident employee physically present in Arizona for fewer than 60 days in a calendar year for the purpose of performing a service benefitting the employer, where the employer is an Arizona business or a related entity with substantial Arizona ownership ties.
The trap is that thresholds are usually retroactive to the first day once crossed. An employee who spends 40 days in a 30-day-threshold state does not owe tax on 10 days; they owe it on all 40, and the employer is the one who failed to withhold.
Unemployment insurance goes to one state only
Income tax can be split between states. Unemployment insurance cannot. Under the localization test used by every state, an employee whose services are performed entirely in Arizona is covered by Arizona for unemployment purposes, and all wages are reported there — regardless of where they live, where you are headquartered, or which state's income tax you withhold. Arizona's 2026 taxable wage base is $8,000. The four-factor test in order.
What you have to register for
| Obligation | State | Agency |
|---|---|---|
| Income tax withholding | Arizona | Arizona Department of Revenue |
| Unemployment insurance | Arizona | Arizona Department of Economic Security / Arizona Department of Revenue |
Frequently asked
Do Arizona and Nevada have a reciprocal tax agreement?
No. There is no reciprocal agreement between Arizona and Nevada. Arizona taxes wages earned in the state by nonresidents, and Nevada does not tax wages at all.
Which state's income tax should be withheld?
Arizona, as the state where the work is performed. Nevada imposes no wage income tax, so Arizona is the only withholding obligation.
Which state gets the unemployment insurance wages?
Arizona. Unemployment coverage is never split between states for a single job. The localization test assigns the whole job to the state where services are performed, which here is Arizona, regardless of residence or where the employer is headquartered.
How many days can an employee work in Arizona before withholding starts?
Arizona applies a de minimis test of 60 working days. Once the limit is crossed, most states require withholding on all in-state wages for the year, not just the excess.