Work in California, Live in Arizona: Taxes Explained

Answer first

Do you owe both California and Arizona income tax?

Yes, and both states end up with a bill. California, the source state, taxes nonresidents on income from California sources, meaning services you physically perform in California. Arizona, your home state, taxes residents on income from all sources at its flat 2.5% rate and gives no credit for California tax on the Arizona return. Instead, California gives Arizona residents the credit: on California Schedule S you subtract the Arizona tax on the same income from your California tax.

So Arizona collects its full tax, and California collects its tax minus the Arizona credit. When California's tax on the wages is higher than Arizona's, your total equals the California tax; when it is lower, the credit is capped at the California tax and your total equals the Arizona tax. By our calculation with the 2025 schedules for a single filer, Arizona's tax is the larger one below roughly $41,600 of wages. Prepare the Arizona return first, because Schedule S needs the Arizona tax figure.

This is general information, not tax advice. Confirm every rule against the current FTB and Arizona Department of Revenue instructions before you file.

Reverse credit

How does the reverse credit work between California and Arizona?

Most state pairs handle double taxation with a resident-state credit: your home state credits the tax you paid to the source state. California and Arizona flip that. The FTB Schedule S instructions list Arizona among the states whose residents may claim a California other state tax credit when they are California nonresidents. In plain terms, an Arizona resident who works in California claims the credit on the California 540NR, not on the Arizona 140.

Arizona statute closes the loop. Under A.R.S. section 43-1071, the resident credit is not allowed if the other state or country allows residents of this state a credit against the taxes imposed by that state or country for taxes paid or payable under this chapter. Because California already allows Arizona residents that credit, Arizona blocks the same credit on Form 309. Attach a copy of your Arizona return to the California return when you claim the credit on Schedule S.

Filing

Which returns and forms should you file?

You file two state returns in a normal year: the California nonresident return and the Arizona resident return. Prepare Arizona first so you know the Arizona tax on the wages you also earned in California, then use that figure on California Schedule S. Attach a copy of the Arizona return and Form W-2 to the California package.

• California Form 540NR: California Nonresident or Part-Year Resident Income Tax Return.
• California Schedule CA (540NR): allocates the California share of wages and adjustments.
• California Schedule S: Other State Tax Credit, used to claim the reverse credit for Arizona tax.
• Arizona Form 140: Arizona Resident Personal Income Tax Return.
• Arizona Form 309: not filed for California wages, because California is a reverse credit state.

Keep both W-2s or the single multistate W-2 that shows California and Arizona withholding, and store a full copy of each return.

Rates

What are the current California and Arizona tax rates?

Arizona uses a flat rate: for tax year 2023 and later, the tax on Arizona taxable income is 2.5%, and Form 140 line 46 multiplies taxable income by 2.5%. The 2025 Arizona standard deduction for a single filer is $15,750.

California is progressive, and nonresidents use an effective-rate method. On Form 540NR you first figure the California tax on all of your income as if you were a resident, divide it by your total taxable income to get an effective rate, and multiply your California taxable income by that rate. For 2025 the single standard deduction is $5,706 and a single filer's taxable income from $72,724 to $371,479 is taxed at $3,201.97 plus 9.3% of the amount over $72,724. The 2026 schedules were not yet published when this page was checked.

California State Disability Insurance also comes out of California pay: 1.3% of wages in 2026, with no wage cap since 2024. It is a payroll deduction, not income tax, and it does not enter the Schedule S credit.

Payroll

How should your employer set up withholding?

Because there is no reciprocity, you cannot give a California employer a form that stops California withholding on California-source wages. Only the wages earned in California are subject to California withholding, split by the share of workdays in California. The California withholding certificate is Form DE 4, the Employee's Withholding Allowance Certificate, used alongside the federal W-4.

Arizona withholding follows where you work. For any day you physically work in Arizona, Arizona withholding is required, regardless of where the employer is based, and you use Form A-4. For work done outside Arizona, Arizona withholding is voluntary: you can ask the employer to withhold Arizona tax and give it Form A-4V if it agrees.

California withholding does not account for the Schedule S credit, so a common result is a California refund and an Arizona balance due. If your Arizona gross income is over $75,000 as a single filer, Arizona also expects estimated payments in the following year unless you are sure you will not reach the threshold again.

Example: Arizona resident with $80,000 of California wages

Single filer, tax year 2025, all wages from work in California, standard deductions. California tax from the 2025 Schedule X less the $153 exemption credit; the Tax Table can differ by a few dollars. CA SDI is a separate payroll deduction. Approximate.

Remote work

Does convenience-of-the-employer apply when you telework from Arizona?

The FTB nonresident page defines California source wages as services performed in California, and the ratio the FTB gives multiplies your total income by California workdays over total workdays. Days you actually work from your home in Arizona for a California employer usually fall outside California source income, subject to specific exceptions such as deferred or equity compensation.

Arizona has no convenience-of-the-employer rule either. As an Arizona resident, all of your compensation lands on your Arizona return regardless of where you were sitting when you earned it. The interaction is straightforward: California picks up only the California workdays, Arizona picks up the whole year, and the reverse credit on California Schedule S removes the overlap. Track your workdays carefully because payroll and tax auditors both look at that log first.

Edge cases

What about local taxes, moving mid-year, or wrong-state withholding?

Neither state's tax agencies describe a city or county income tax on wages in the materials for this page. California cities may levy business taxes, and Arizona cities collect transaction privilege tax on sales; neither is a paycheck income tax.

If you move mid-year, you become a part-year resident of both states: California Form 540NR with the part-year portion marked, and Arizona Form 140PY. If the wrong state was withheld, file a refund claim with the state that took the money and a return with the state that should have received it, before the refund deadlines run out. Arizona's 2025 return was due by midnight on April 15, 2026.

Verify

Where can you verify the reverse credit rule?

Three official documents settle almost every question. The FTB Schedule S instructions list which states qualify for the California nonresident credit and confirm Arizona is on that list. The FTB Part-year resident and nonresident page confirms that a nonresident pays California tax on income from California sources and files Form 540NR. Arizona Revised Statutes section 43-1071 confirms that the Arizona resident credit is blocked when the other state credits Arizona instead.

If your situation is unusual, for example equity compensation earned partly in California and vested after you moved to Arizona, read FTB Publication 1004 for equity compensation sourcing and consider a paid preparer familiar with both states. And check the current-year Schedule S each January because California can add or remove states from the reverse credit list from time to time. Indiana, for example, has not been treated as a reverse credit state since January 1, 2017.

Two utility numbers help when a rule reads gray. The FTB's general line is 800-852-5711 from anywhere in the United States (916-845-6500 is for callers outside the U.S.), and the Arizona Department of Revenue answers at (602) 255-3381 in Phoenix or (800) 352-4090 from area codes 520 and 928. Arizona payments go through AZTaxes; keep your confirmation numbers.