California Closed Montana Vehicle Tax Loophole
New legislation aims to stop residents from avoiding state sales taxes and fees by using out-of-state shell companies.
Updated on Oct. 1, 2026 in Taxes
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Gov. Gavin Newsom signed SB 1406, granting state officials new authority to investigate residents who register vehicles in Montana to evade local taxes. The state estimates that this tax avoidance strategy has cost the California treasury $20 million in annual revenue.
Why it matters
The legislation is designed to recover significant lost sales tax and registration fee revenue. By targeting the use of shell companies, the state intends to ensure vehicle owners pay their share of required California taxes.
California officials estimate the state has been losing $20 million in annual tax revenue due to the Montana loophole. This figure represents the estimated cumulative loss from residents registering cars, trucks, boats, and aircraft out-of-state.
The players
Gavin Newsom
The current Governor of California who signed legislation to address state tax revenue losses.
The details
Under the new law, state revenue officials can now investigate the individuals behind limited liability companies formed in Montana. Previously, residents used these shell entities to purchase and register high-value vehicles in Montana, thereby circumventing California's mandatory sales tax and registration fees. The law provides the enforcement teeth needed to identify and pursue those masking their true residence to avoid these costs.
Timeline
September 30, 2026: Gov. Gavin Newsom signed SB 1406 into law.
Money Landscape
This legislation reflects an effort to close a persistent tax loophole that has allowed residents to avoid local vehicle costs for years. It follows a broader trend of states increasing enforcement against out-of-state registration schemes to protect local tax bases.
Residents who have registered vehicles through out-of-state shell companies should consult a tax professional to understand their compliance status under the new law. The state now has expanded authority to investigate these arrangements, which may lead to back-tax assessments.
The takeaway
The state is now actively cracking down on the use of Montana shell companies to avoid vehicle taxes. If you have concerns about your vehicle's registration status or tax compliance, discuss your specific situation with a qualified tax professional.
Further reading
Learn more about local filing requirements by visiting the Taxes section.
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Should states have expanded authority to crack down on residents registering vehicles in other states?
