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California SB 1406 became law on Sept. 30, 2026, changing how the state treats shell companies that own vehicles, vessels or aircraft brought into California. The law applies a California-residency test when a shell company has a California-resident owner or other specified participant, and can make those people personally liable for unpaid taxes, interest and penalties.
California enacted Senate Bill 1406 on Sept. 30, 2026, changing how the state applies sales and use tax to vehicles, vessels and aircraft held by certain shell companies. The law targets arrangements that can use out-of-state business registrations, including Montana LLCs, and provides for personal liability for specified company participants when taxes remain unpaid.
Under California’s existing Sales and Use Tax Law, a vehicle, vessel or aircraft that a California resident brings or ships into the state can be subject to tax, whether or not it is registered in California. The law also covered property held by businesses, but applied a different test to establish whether a business was California-based. As The Drive’s report explains, the previous rules generally allowed an out-of-state business to avoid being treated as a California resident when more than half of its business was outside the state.
SB 1406 expands the categories covered by that business-residency framework. In addition to corporations and limited liability companies, the report says the law includes partnerships, limited partnerships and limited liability partnerships. It also creates a specific rule for shell companies: the bill summary says a shell company is treated as a California resident for the relevant presumption if any shareholder, partner, member or beneficial owner is a California resident.
The law also addresses who may be responsible for a tax debt. The bill summary states that an officer, manager, partner, beneficial owner or member of a shell company can be personally liable for unpaid taxes, along with interest and penalties associated with the unpaid amount. The summary says nonpayment may constitute a crime. The source report does not provide further details about how the law will be enforced or how agencies will determine whether a particular company qualifies as a shell company.
Who Could Face California Tax Bills
The change matters to California residents who hold vehicles or other property through an out-of-state entity, as well as to people who help manage or own such companies. Under the new rule described in the bill summary, the presence of a California-resident shareholder, partner, member or beneficial owner can affect the shell company’s treatment. Out-of-state registration alone may no longer settle the tax question for arrangements covered by the law.
That can affect the cost and risk of holding high-value property through a company. The Drive’s report points to expensive vehicles as examples, but the measure also covers vessels and aircraft. Personal liability provisions mean that people connected to a shell company may face more than a tax bill directed only at the entity. The exact tax due will depend on the facts of an individual purchase and the law’s application; the source material does not establish that every Montana-registered vehicle in California is taxable under the new measure.
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How the Montana Registration Strategy Worked
Montana became associated with this practice because, according to The Drive, it does not charge sales tax on vehicle purchases and does not require owners to have vehicles inspected or smog-tested. Some California residents reportedly used Montana LLCs to register vehicles, placing legal ownership with an out-of-state company rather than registering the vehicle directly in California.
The former rules distinguished between a person’s residency and a business’s connection to California. The report describes a test under which an out-of-state company could qualify for different treatment if more than half its business was conducted outside California. The new law changes the treatment of specified shell companies and broadens the business forms covered. The bill’s passage followed more than seven months of legislative activity, according to The Drive, before it became law on Sept. 30, 2026.
“A shell company is a resident of this state if any shareholder, partner, member, or beneficial owner is a resident of this state.”
— SB 1406 bill summary, as quoted by The Drive
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How the New Rules Will Apply
The source material does not explain how California will identify a shell company, what evidence will establish a person’s residency or beneficial ownership, or how the state will assess a specific vehicle or other asset. It also does not describe enforcement procedures, potential exemptions or how disputes will be handled. The law does not mean that every Montana-plated vehicle is automatically subject to tax; the outcome depends on the ownership arrangement and the relevant facts.
The report provides no figures on how many vehicles or companies may be affected, nor an estimate of potential tax collections. It also does not include comments from state tax officials, affected owners or legal experts on implementation. Those details remain open based on the material available.
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Owners Should Review Their Records
The next step is implementation and application of SB 1406 to companies and property covered by its terms. People who own or manage an entity holding a vehicle, vessel or aircraft in California may need to review its ownership structure, residency details and tax records with a qualified tax professional. The Drive’s report advises that paperwork should be in order, but it does not cite a specific state filing deadline or enforcement schedule.
Further guidance from California tax authorities, along with any enforcement actions or legal challenges, may clarify how the shell-company provisions work in practice. Until then, the central confirmed change is the expanded residency test and potential personal liability stated in the bill summary—not a blanket determination for every out-of-state registration.
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Key Questions
What did California SB 1406 change?
It expanded the business forms covered by the state’s tax-residency framework and added a rule treating a shell company as a California resident for the relevant presumption when any shareholder, partner, member or beneficial owner is a California resident.
Does the law automatically tax every Montana-plated car in California?
No. The source material does not say every Montana-registered vehicle is automatically taxable. The outcome depends on the company structure, ownership and other facts relevant to the law.
Who could be personally liable for unpaid taxes?
The bill summary says an officer, manager, partner, beneficial owner or member of a shell company may be personally liable for unpaid taxes, interest and penalties.
When did SB 1406 become law?
The Drive reports that the bill became law on Sept. 30, 2026.
Source: hn
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