California FTB Residency Audit

What Is an FTB Residency Audit?

A California FTB residency audit is an examination of whether you were a California resident — and therefore subject to California income tax on all worldwide income — in a given tax year. Residency audits are most commonly triggered when a high-income taxpayer claims to have moved out of California, files as a part-year resident, or files a nonresident return while the FTB has evidence of California connections. The FTB aggressively audits residency claims because California's top income tax rate (13.3%) creates a strong incentive to establish residency elsewhere.

Domicile vs. Residency

California uses two related but distinct concepts: domicile (your permanent home — the place you intend to return to) and residency (where you actually live). You can have only one domicile but can be a resident of multiple states simultaneously. California taxes you as a resident if California is your domicile OR if you spend more than nine months in California in a given year (the statutory resident test).

The 546-Day Safe Harbor

California provides a safe harbor from residency status for individuals who are outside California for an uninterrupted period of more than 546 days (approximately 18 months) under an employment-related contract. This safe harbor is narrow — it requires a specific employment contract, not just a general decision to work elsewhere. Most people who claim to have "moved" out of California do not qualify for this safe harbor and must instead establish that their domicile changed.

What the FTB Examines

The FTB uses a "closest connections" test that examines where you have your strongest ties. Factors the FTB weighs include:

• Location of your principal residence
• Location of your spouse and children
• Location of your business activities
• Location of your bank accounts and financial advisors
• Location of your vehicles and driver's license
• Location of your doctors, dentists, and other service providers
• Location of your club memberships, religious affiliations, and social organizations
• Physical presence records (cell phone records, credit card transactions, travel records)

The FTB can subpoena cell phone records, credit card statements, and travel records to establish your physical presence in California. KDA has seen FTB auditors use EZ-Pass records, airline boarding passes, and hotel receipts to reconstruct a taxpayer's day-by-day location.

Documentation to Win a Residency Audit

If you are claiming to have changed your California domicile, you need contemporaneous documentation that your ties to the new state are stronger than your ties to California. KDA advises clients who are planning to leave California to: (1) obtain a driver's license in the new state immediately, (2) register vehicles in the new state, (3) change voter registration, (4) move bank accounts and financial advisors, (5) establish relationships with doctors, dentists, and other service providers in the new state, (6) keep a detailed travel log showing days in each state, and (7) if possible, sell or rent out the California home rather than keeping it available for personal use.

High-Income Taxpayer Targeting

The FTB's residency audit program disproportionately targets high-income taxpayers — particularly those with income over $1 million who claim to have moved out of California. The FTB has a dedicated team that monitors high-income taxpayers who file California returns one year and then file as nonresidents or stop filing California returns in subsequent years. KDA works with clients who are planning to leave California to establish a defensible residency change before the FTB initiates an audit.