Rules for Establishing Domicile in California

Barry received a notice from the California Franchise Tax Board (FTB) claiming he still resided in California despite having moved to Nevada five years ago. He believed simply severing ties – selling his house and registering to vote in Nevada – was enough. Now, he faces potential tax liabilities on income he thought was shielded, and a costly legal battle to prove his change of domicile. This could easily exceed $50,000 in penalties and back taxes.

As an Estate Planning Attorney and CPA with over 35 years of experience, I frequently advise clients on the complexities of establishing – and proving – California domicile, especially when moving out of state. It’s far more involved than most people realize, and the FTB is aggressive in protecting its tax base. My dual background as both an attorney and CPA provides a unique advantage; I can address not only the legal requirements but also the critical tax implications, including the crucial step-up in basis for assets and potential capital gains exposure.

What Constitutes Legal Domicile in California?

Domicile isn’t simply where you hang your hat; it’s your true, fixed, and permanent home, the place to which you intend to return. It’s a legal concept with significant consequences for income tax, estate tax, and probate purposes. California law prioritizes intent, but intent is demonstrated through objective evidence, not just a declaration. Establishing a new domicile requires more than just physical presence in a new state; it demands a severing of ties with California and the establishment of new connections in your chosen state.

What Steps Should I Take to Change My Domicile?

To successfully change your domicile, a comprehensive approach is necessary. Simply moving your belongings isn’t enough. Consider these crucial actions:

• Physical Presence: Spend more time in your new state than in California. While the old “183-day rule” is often cited, spending less than 183 days in California does not automatically terminate residency; the FTB uses the ‘Closest Connection’ test (evaluating 19 factors like your primary doctor and social ties) to determine domicile.
• Official Records: Update your driver’s license, vehicle registration, and voter registration to reflect your new state of residence.
• Financial Accounts: Change the address on your bank accounts, credit cards, and investment accounts to your new address.
• Important Documents: Update the address on your U.S. Postal Service change-of-address form.
• Healthcare: Establish a primary care physician and dentist in your new state.

How Does the FTB Determine Residency?

The FTB employs a rigorous investigation process to determine your residency. They look beyond superficial changes and delve into the details of your life. Auditors will use Form 4600 (Residency Questionnaire) to scrutinize your life, including the location of your dentist, the registration of your pets, and where you keep your safe deposit boxes. They will also consider where you conduct your business, maintain your social connections, and own property. The FTB looks for a pattern of behavior demonstrating a clear intention to make the new state your permanent home.

What Happens if I Maintain Property in California?

Owning property in California doesn’t automatically mean you remain a resident, but it creates a presumption of residency that you must overcome. You’ll need to demonstrate that the property is held for investment purposes and not for personal use. Careful documentation is crucial, including rental agreements (if applicable) and evidence of limited personal visits.

Furthermore, understand the distinctions for real estate transfers. For deaths on or after April 1, 2025, a primary residence valued up to $750,000 qualifies for a ‘Petition for Succession’ under AB 2016 (Probate Code § 13151). However, this is a Petition requiring a Judge’s Order, not an “Affidavit.” Crucially, to qualify, the decedent’s other non-real estate assets typically must remain below the separate $208,850 Small Estate limit. Don’t confuse this with the Small Estate Affidavit, which is strictly for real property valued under $69,625 (e.g., timeshares, vacant land).

What About Estate Tax Implications?

While the federal estate tax exemption is substantial, it’s important to plan accordingly. The 2026 ‘Sunset’ was averted by the One Big Beautiful Bill Act (OBBBA), which permanently increased the Federal Estate Tax Exemption to $15 million per person effective Jan 1, 2026. However, California does not have a state estate tax, but maintaining California domicile could impact the location for filing probate, which has its own set of fees and requirements.

How do probate courts in California evaluate intent when a will is challenged?

In California, a last will and testament is reviewed under probate standards that focus on intent, capacity, and execution. Clear drafting reduces ambiguity, limits misinterpretation, and helps families avoid unnecessary conflict during estate administration.

When a will is drafted with California probate review in mind, it becomes a stabilizing roadmap rather than a source of conflict. Clear intent, proper authority, and compliant execution protect both families and estates.

Controlling Legal Standards for Establishing Domicile and Residency

• Residency Guidelines: FTB Pub 1031 (Guidelines for Determining Resident Status)
  This is the primary resource for the “Closest Connection” test. In 2026, it details how the FTB evaluates 19 factors—including the location of your healthcare providers and social ties—to determine if your presence in the state is “permanent” or merely “transitory.”
• Voter Registration: California Secretary of State – Voter Registration
  Updating your voting address is a critical indicator of intent. For the June 2, 2026, Primary Election, the deadline to register online is May 18, 2026. This serves as a public declaration of your primary home.
• Federal Estate Tax: IRS Estate Tax Overview
  While domicile determines state tax, this resource outlines federal guidelines. It reflects the 2026 OBBBA update, which permanently set the federal estate tax exemption at $15 million per person ($30 million for couples), indexed for inflation.
• Proof of Residency: California DMV – REAL ID Checklist
  Since the federal enforcement deadline passed in 2025, a REAL ID is mandatory for domestic flights. This page lists the specific residency documents (e.g., utility bills, tax returns) that the state accepts as proof of a permanent California address.