Moving to California

A California resident is anyone in the state “for other than a temporary or transitory purpose,” or anyone domiciled here who is away temporarily. That is the whole statutory test, and the Franchise Tax Board, the Department from here on, applies it by asking where your closest connections are: your home, your spouse and children, your driver’s license and car registration, your voter registration, your doctors, your bank, your professional licenses, your social life. Days count, but there is no number of days that settles it. Spend more than nine months here and you are presumed a resident; spend six and you may still be one if the ties say so. Residents owe California tax on income from everywhere. Nonresidents owe it on California-source income only. A part-year resident is both in one year, files Form 540NR, and pays California tax on the California portion at the rate the full year’s income would have produced, which is the part of the move-year return that surprises people.

Three further facts shape every cross-border situation. California has no reciprocity agreement with any state, so a Nevada or Oregon resident who works in California files here. Wages are sourced to where the work is physically performed, and California has no “convenience of the employer” rule, so a nonresident who works from home in Texas for a San Francisco employer owes California nothing on those days and a Texan who flies in for a week of meetings owes California for that week. And retirement income paid to a nonresident is not California income, which makes the timing of a move around IRA withdrawals and Roth conversions worth real money.

Resident, nonresident, part-year

Domicile and residency are different words here. Domicile is your one permanent home, the place you intend to return to. You can be a California resident without being domiciled here (a long work assignment with your family along) and a nonresident while still domiciled here (the 546-day safe harbor). The Department publishes the factors in FTB Publication 1031 and says plainly that the strength of ties matters more than their number.

The move year: Form 540NR and the rate trap

A part-year resident does not simply pay California tax on the California share of income at that share’s own bracket. Form 540NR first computes the tax on the entire year’s taxable income as if you had been a resident all year, turns that into an effective rate, and applies the rate to California taxable income. The exemption credits and the standard deduction are prorated by the ratio of California AGI to total AGI. The result is that six months of California wages are taxed at the bracket a full year of your income reaches, not the bracket six months of it would reach on its own.

Income is allocated by when it was received and where you lived. Wages earned while a resident are California income wherever the employer was; wages earned after the move are California income only for days physically worked here. Interest, dividends and capital gains on stock are California income if received while a resident and not after, with no regard to where the brokerage is. Rental income and gain on real estate follow the property. Pension and IRA payments received after the move date are not California income. Bonuses, stock options and deferred compensation earned over a period that straddled the move are split by California workdays in the earning period, which is why a tech employee’s options can produce California income for years after leaving. Schedule CA (540NR) does the work: columns A through D rebuild federal AGI as if you were a full-year resident, and column E isolates the California amounts.

Working across the line

Living outside California, working inside it. A Nevada, Arizona or Oregon resident who commutes or flies in owes California tax on the wages for the days worked here, files Form 540NR, and claims the credit for that tax on the home-state return, except in the four reverse-credit states described below. The employer should withhold California tax on the California days; many do not, and the nonresident ends up owing in April.

Living in California, working outside it. A California resident is taxed on all wages and takes the other state tax credit on Schedule S for income tax paid to the state where the work was done, limited to the California tax on that same income. The credit is for net income taxes only; a city income tax, the Portland metro taxes or a gross-receipts tax does not count. With California’s rates usually the higher of the two, the credit normally erases the double tax but leaves the Californian paying California’s rate overall.

The reverse-credit states. For residents of Arizona, Oregon, Virginia and Guam who earn California-source income, the credit runs the other way: they claim the credit for California tax on their home-state return, and a California resident with wages from Arizona, Oregon or Guam claims the credit on that state’s nonresident return instead, not on Schedule S; for Virginia the California return allows it only in dual-resident cases. Indiana left this list in 2017. Getting it backwards means a denied credit and a letter.

Remote work. California sources wages to where the employee sits when working. An employee who moves to Idaho and keeps a California employer owes California only for days physically in California after the move, and should give the employer the new address and ask that California withholding stop. The reverse, a California resident working remotely for an out-of-state company, is simply a California resident with wages. The rule that catches people is the business trip: a nonresident’s week of meetings in Los Angeles is California income for that week.

Military. Active-duty pay of a servicemember stationed in California but domiciled elsewhere is not California income; a California-domiciled servicemember stationed outside the state is generally a nonresident while away. FTB Publication 1032 has the details.

Selling the house

California conforms to the federal $250,000 and $500,000 exclusion on the sale of a principal residence, so a move that begins with a home sale is usually tax-free on both returns. Two California mechanics apply. The escrow company must withhold 3 1/3% of the gross sale price for the Department unless the seller signs Form 593 certifying an exemption, and the principal-residence exemption is the one most sellers check; a seller who has already moved out and rented the house for a few years may not qualify and will wait for a refund of withholding that can run to five figures. And a nonresident who keeps a California rental is taxed by California on the rent every year and on the gain when it sells, forever, with the 3 1/3% withholding at the closing.

Arriving

A new resident is taxed on everything from the date of arrival, including interest and dividends from accounts that never left the old state. Income received before the move date is not California income, so a bonus or stock sale that can be timed should land before the move, the mirror image of the departure advice. Tax the former state charges on income earned after arrival is creditable on Schedule S. And California does not tax Social Security, has no HSA, and has a small standard deduction with a free choice to itemize for the state only; the return is covered in How California income tax works.

Leaving: what the Department looks at

The Department audits departures, especially of people who leave in a year with a large income event, a business sale, an IPO, a big conversion. Its own Residency and Sourcing Technical Manual, revised in January 2026, sets out what auditors check, and it tracks the Publication 1031 factors: where you slept each night (keep a calendar and the receipts that support it), where your spouse and children lived and went to school, which home was larger and more lived in, where the cars were registered and the licenses issued, where you voted, which doctors and dentists you saw, where your clubs and congregation were, and whether you kept a California house available for your use. A person who moves to Nevada, keeps the La Jolla home and sees the same cardiologist has not moved in the Department’s eyes, and the audit will say so three years later with interest.