California Source Income After You Move

California source income is income the state can tax because of where it was earned, not because of where you live. That is why leaving California does not always end your California tax bill. Even as a nonresident, you can owe California tax on equity compensation you earned while working in the state, on certain deferred pay, and on income from a California business or property. Understanding what still counts as California source income, and when, is how you avoid a surprise assessment or a residency audit that widens into an income fight. To review your situation with counsel, call (415) 968-1780. This article pairs with Moving Out of California Without Triggering an FTB Audit. Residency decides how much of your income California can reach; sourcing decides which income it can reach even after you are gone.

What “California source income” means for a nonresident

Nonresidents are taxed by California only on income sourced to California. The question is not where you live when you are paid, but where the income was earned or where the underlying asset or activity is located. Wages track where you performed the work. Business income tracks where the business operates. Real estate income tracks where the property sits. Because compensation and business proceeds are often earned over years spent in California, income can remain California-sourced well after you move away.

Equity compensation: RSUs and stock options

Restricted stock units

California generally sources RSU income using a workday allocation. It looks at the period from grant to vesting and taxes the portion of the income that corresponds to the days you worked in California during that period. If you were granted RSUs while working in California and they vest after you move, California can still tax the California-workday share. Keeping accurate records of where you worked across each vesting period is essential.

Stock options

Nonstatutory stock options are sourced on a similar workday basis over the relevant period from grant to the point the income is recognized. The California Office of Tax Appeals has upheld California tax on former residents’ option income tied to California work. The details vary by option type and facts, and FTB Publication 1004 sets out the state’s equity-compensation guidelines, so option income deserves a careful, individualized look before you exercise or sell.

Deferred compensation, bonuses, and retirement income

Federal law protects some of this income and not other parts of it. Under federal law, states generally cannot tax a former resident’s qualified retirement income, and this protection also covers certain nonqualified deferred compensation paid in substantially equal installments over at least ten years. A qualified pension you receive after leaving California is generally not taxable by California. By contrast, a lump-sum payout of nonqualified deferred compensation, or a bonus tied to work you performed in California, can still be California source income. The structure and timing of the payout drive the answer.

Selling a business or receiving installment payments

Business sales are where the largest surprises appear. Gain from selling California real property or a California business interest can be California source income, and installment payments from a sale that closed while you were a resident can carry California tax as you collect them. The sale of intangible assets such as corporate stock is generally sourced to where you reside at the time of sale, so becoming a nonresident first can matter, but there are important exceptions for business situs, partnership assets, and installment arrangements. If a company sale is on your horizon, coordinate the timing with your move. California treatment of a company-stock sale is also different from the federal rules. California does not conform to the federal qualified small business stock exclusion, so a sale that is partly tax-free federally can still be fully taxable by California. We cover that in California and QSBS under Section 1202 and in the broader qualified small business stock guide.

If you are planning a move around a sale, our Residency Audit Risk Assessment addresses the timing, and our business transaction tax practice reviews the deal itself.

Real estate and business income

Some categories are straightforward. Income from California real property, including rent and gain on sale, is California source income regardless of where you live. Income from a business operating in California, including your share of a partnership or S corporation doing business in the state, is apportioned to California under the state’s rules. Moving away does not change the source of income the California operations continue to generate.

How the FTB finds California source income

The FTB does not rely on your word. It receives wage and equity-compensation reporting, matches information returns, and reviews the records of California businesses and partnerships. A residency audit frequently expands into a source-income examination once the FTB sees a vesting event or a business sale. That is why accurate workday records and consistent reporting matter so much: the state often already has a version of the story, and you want yours to match the documents.

Planning to reduce your California source income

Good planning starts before the income event. Where the facts allow, coordinate the timing of a move with vesting dates and a business sale, document your workdays inside and outside California across each relevant period, and confirm the sourcing of each significant item before you file. These steps will not make genuinely California-sourced income disappear, but they ensure you pay only what California can actually reach, and that you can defend it if the FTB asks.

How Kugelman Law helps

We advise nonresidents and departing residents on California source income and represent them in FTB audits and related tax matters, including the residency and income examinations that often travel together. Our Los Angeles tax attorney page explains how we serve Southern California clients. Our results reflect what disciplined advocacy achieves in high-stakes tax disputes. In one federal matter, two IRS Notices of Deficiency proposing more than $557,000 across six years were settled in U.S. Tax Court down to roughly $38,000, and with avoided interest and California exposure the client effectively saved over $1.2 million. Results depend on specific facts. Past results do not guarantee future outcomes.

Talk to a California tax attorney about your source income

If you have moved or plan to, and you expect equity compensation, deferred pay, or a business sale, get the sourcing right before you file. Schedule a paid, privileged consultation with Kugelman Law by calling (415) 968-1780 or visiting our contact page.

Frequently asked questions

Do I owe California tax after I move away?

You can. As a nonresident, you are taxed on income sourced to California, which can include equity compensation earned while working in the state, certain deferred pay, and income from a California business or property. Residency ends your tax on non-California income; it does not end tax on California source income.

Are my RSUs taxed by California if they vest after I leave?

Often, in part. California generally allocates RSU income based on the days you worked in California between grant and vesting. If you earned part of that period in California, the California-workday share can be taxable even though the RSUs vested after you moved.

Is my pension taxed by California after I move?

Generally no. Federal law bars states from taxing a former resident’s qualified retirement income, and the protection extends to certain nonqualified deferred compensation paid in substantially equal installments over at least ten years. A lump-sum deferred-comp payout may be treated differently.

Is the sale of my company taxed by California if I already moved?

It depends on the facts. Gain on California real property or a California business interest can be California source income, and installment payments from a sale that closed while you were a resident can carry California tax. Sale of corporate stock is generally sourced to your residence at the time of sale, with important exceptions. Timing relative to your move matters.

How does the FTB know about my income after I leave?

Through information reporting and matching. The FTB receives wage and equity-compensation data and reviews California business and partnership records, and a residency audit often expands into a source-income review once a vesting event or sale appears.

About the author

Alex Kugelman is the founder and managing attorney of Kugelman Law, with nearly two decades of federal and California tax controversy experience, including U.S. Tax Court and U.S. District Court litigation. He is admitted in California and before the U.S. Supreme Court, the U.S. Tax Court, and the U.S. District Court for the Northern and Eastern Districts of California, and served as San Francisco Chair of the Federal Bar Association Tax Division in 2018. He has been quoted in the Financial Times and the New York Post on California’s billionaire tax and the state’s residency audits of departed wealthy residents. For clients who also face IRS examinations, his colleague Otto Bosch, a former IRS Revenue Agent from the Global High Wealth group, leads the firm’s federal audit-defense work. This article is attorney advertising and general information, not legal advice. Sourcing rules are fact-specific and can change. Contacting Kugelman Law does not create an attorney-client relationship.