Work in Arizona, Live in California: How Your Taxes Work

Answer first

Do you pay Arizona and California tax on the same paycheck?

You file with both states, and the overlap is removed on the Arizona return. California taxes its residents on all income regardless of source, so every dollar you earn in Arizona goes on your California Form 540. Arizona taxes nonresidents on income derived from Arizona sources, and wages top its list, so you also file Arizona Form 140NR.

The usual pattern, where the home state credits the work state, is switched off for this pair. The FTB Schedule S instructions say no credit is allowed if the other state allows California residents a credit for net income taxes paid to California. Arizona does allow that credit. So California collects its full tax, and Arizona subtracts a credit for the California tax on the same wages, capped at the Arizona tax on those wages. In practice your combined bill lands near the larger of the two state taxes on that pay, and at $80,000 of wages that is the California figure, as the worked example below shows.

This is general information, not tax advice.

The credit

How does the Arizona credit for California tax work?

Arizona Revised Statutes section 43-1096 gives nonresidents a credit for net income taxes paid to their home state on income Arizona also taxes, but only when the home state does not already credit Arizona. The Arizona Department of Revenue applies it by name: its Form 309 instructions say Arizona nonresidents who file resident returns with California, Indiana, Oregon, and Virginia qualify. The same instructions warn that the list is subject to change at any time, so read the current year before filing.

The statute limits the credit twice. It covers only the share of your California tax that falls on income Arizona also taxes, and it cannot exceed the share of your Arizona tax that falls on that same income. Form 309 works out both limits, and line 17 is the smaller of line 11 or line 16. That amount goes to Arizona Form 301, Part 1, line 2, column (a), and the Form 301 total lands on Form 140NR line 60, which cannot take your Arizona tax below zero.

Withholding alone does not earn the credit. Form 309 instructions say you must file a net income tax return to the other state, so the California return has to be filed, not just withheld on.

Filing

Which returns do you file, and in what order?

Finish California first, because Form 309 needs your final California tax.

• California Form 540: the resident return, reporting all wages, Arizona pay included. You do not claim Schedule S for Arizona tax.
• Arizona Form 140NR: the nonresident return. In the Arizona column, line 15 takes all amounts received for services performed in Arizona.
• Arizona Form 309: figures the credit for California tax on the same wages.
• Arizona Form 301: Nonrefundable Individual Tax Credits and Recapture, included with Form 309.

Check your W-2 before you start. If your employer has employees or does business in California, expect a California line as well as an Arizona line; the EDD tells employers that the wages reported as California PIT wages should match box 16 of your W-2. An Arizona-only employer with no California presence does not have to withhold or report California tax, so its W-2 may correctly show only Arizona.

For tax year 2025, a single nonresident had to file with Arizona if gross income was more than $15,750 multiplied by the Arizona income ratio on line 27 of Form 140NR. Both 2025 returns were due April 15, 2026; California allows filing until October 15, 2026 without a late-filing penalty, but tax owed was due in April. Arizona allows up to a 6-month extension through Form 204 or your federal extension, but an extension does not extend the time to pay.

Rates

Which rates and deductions apply on each return?

Arizona. The 2025 Form 140NR instructions say to multiply taxable income by 2.5% (.025). Nonresidents must prorate the standard deduction: $15,750 for a single filer before prorating, multiplied by the Arizona income ratio. If all of your wages come from Arizona work, the ratio is 1.000 and you keep the whole deduction.

California. A resident uses the full standard deduction, $5,706 for a single filer in 2025, and the 2025 Schedule X, where taxable income from $72,724 to $371,479 is taxed at $3,201.97 plus 9.30% of the amount over $72,724. Form 540 then subtracts a $153 personal exemption credit. California had not printed 2026 schedules when we checked: its 2026 estimated tax worksheet still tells you to use the 2025 tax table.

SDI. California State Disability Insurance is withheld at 1.3 percent in 2026, but coverage depends first on where the work is done. An EDD information sheet says services outside California cannot become subject to California law unless some portion of the services are rendered in California. An all-Arizona job therefore sits outside SDI; if you split days, the EDD's four multistate tests decide.

Payroll

What should your employer withhold, and can Arizona withholding stop?

An employer must withhold Arizona income tax from pay for services performed in Arizona. You choose a percentage of gross taxable wages on Form A-4: 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0% or 3.5%. A new hire who skips Form A-4 for 5 days is withheld at 2.0% until they elect otherwise.

California residents can switch that off if they qualify. The Arizona Department of Revenue says a nonresident working in Arizona may claim an exemption from Arizona withholding if they live in California, Indiana, Oregon, or Virginia and can claim the credit for home-state tax on Form 140NR. The claim goes on Form WEC, Withholding Exemption Certificate, which you give to the employer and keep a copy of. Arizona law also excludes from withholding, though not from tax, the wages of a nonresident physically present in Arizona for less than sixty days in a calendar year, for employers with property, payroll and sales in the state. Another route is Form A-4's zero percent election, available if you expect no Arizona tax liability for the year; Arizona counts credits for taxes paid to other states when you judge that.

On the California side, the EDD employer guide (DE 44) says a California resident's wages are subject to California withholding whether the work is in California or another state, and the EDD's multistate guide limits that duty to employers with a California connection, such as employees or business in California. Where both states require withholding, the employer takes the other state's amount first and withholds for California only the excess, so if Arizona withholding continues because you did not file Form WEC, the Arizona tax comes back only as a refund on Form 140NR while California withholding falls short. The EDD adds that paying estimates instead of required withholding can lead to an assessment against the employer. If your pay stub shows no California withholding, plan on estimated payments: generally required when you expect to owe at least $500 after withholding and credits.

Example: California resident earning $80,000, all worked in Arizona

Single filer, tax year 2025, standard deductions, no other income. Arizona rounds to whole dollars; California tax from the 2025 Tax Table, which Form 540 requires below $100,000 of taxable income, less the $153 exemption credit. Approximate.

Remote work

Do days worked from home in California count for Arizona?

Arizona taxes a nonresident only on Arizona gross income, meaning the part of federal adjusted gross income from sources within Arizona. The Form 140NR wage line asks for amounts received for services performed in Arizona, so a day spent working at your kitchen table in California belongs in the federal column only. The 2025 nonresident instructions do not describe a convenience-of-the-employer rule that would pull those days back into Arizona; if your payroll department treats them differently, ask the Arizona Department of Revenue before you file.

California does not care where you sat. As a resident, you are taxed on all income regardless of source. Remote days change the Arizona math: a lower income ratio, a smaller prorated deduction, less Arizona tax and a smaller credit. They can also make your employer one that pays wages for services performed in California, which brings California withholding and can move SDI coverage to California. Keep a simple calendar of where you worked each day, because the ratio comes straight from it.

Edge cases

What if you move mid-year, are withheld wrongly, or see a city tax?

Moving. California taxes a part-year resident on all worldwide income received while a California resident and on California-source income while a nonresident, reported on Form 540NR. Arizona requires Form 140PY if you moved into Arizona with the intent of becoming a resident. Form 309 then splits the year: follow the resident instructions for the Arizona-resident months and the nonresident instructions for the rest.

Wrong-state withholding. If Arizona withheld although you qualified for the WEC exemption, the extra comes back as a refund on Form 140NR once the Form 309 credit is applied. If California withheld too little, the balance is due with Form 540, so fix the setup early in the year.

City and county taxes. The Form 309 instructions say not to include any taxes paid to a city or county when you figure the credit.

Verify

Where can you check these rules yourself?

• FTB Schedule S instructions, section A: no California credit when the other state credits California residents.
• Arizona Form 309 instructions: the nonresident list naming California, and the line 17 limit.
• Arizona Form 140NR instructions: filing threshold, 2.5% rate, prorated deduction, estimated payments.
• Arizona Department of Revenue withholding page: Form A-4 percentages and the Form WEC exemption.
• EDD DE 44: withholding rules for California residents working in another state.

Arizona estimated payments matter for high earners: a single nonresident whose Arizona gross income was greater than $75,000 for 2025 and is expected to be greater than $75,000 for 2026 must make them, unless credits such as the Form 309 credit for California tax bring the expected Arizona tax to zero; the 2026 Arizona estimate worksheet stops at that point, which is the case in the $80,000 example below.