Montana-plate tax savings now carry a California audit risk

Jay Leno has filled Big Dog Garage in Burbank with everything from steam-powered century-old vehicles to Bugattis and a McLaren F1, lending his name to a recent California law easing smog checks for some classics. Montana license plates get no such endorsement. "If you can afford the car, you probably can afford the tax," Leno said. "California is ridiculously expensive to live in, but we want to live here."

States from Utah to Maryland are getting tough with residents who register vehicles elsewhere to avoid taxes and fees at home, and California has joined, with lawmakers putting the annual cost of the "Montana loophole" at $20 million. The legislature passed a bill in late August that treats certain shell companies as state residents for collection purposes and sent it to Governor Gavin Newsom's desk; State Senator Jerry McNerney, the author, calls it a scam. "Let's close this loophole and make people pay their share."

The arithmetic is straightforward: California's 7.25% base sales and use tax rate on a $6 million car comes to $435,000 that a Montana registration avoids, because Montana has no general-use sales tax and its registration fees run substantially lower than California's. The incentive shows in Montana's own rolls—about 1.1 million residents but more than 2.4 million registered vehicles in 2024 against 879,000 licensed drivers, close to three per driver, the highest ratio in the country and more than twice the U.S. average, according to a Bloomberg analysis of Federal Highway Administration data.

At Monterey Car Week last month, Montana plates appeared on Koenigsegg supercars, old Land Rover Defenders, and Lamborghini Countachs. Connor Wohl, co-founder of Manhattan Beach Cars and Coffee in El Segundo, spotted one on a Ferrari 288 GTO, the limited-production 1980s car that now commands more than $6 million. "Given how rare and valuable those cars are, it certainly stood out," he said.

None of it is automatically illegal; the practice remains legal under certain circumstances, but California lawmakers argue some residents improperly place legal ownership with out-of-state entities, often in Montana. That distinction is the planning work. A vehicle titled to a Montana entity, garaged in California, and driven by a California resident is a set of facts a revenue department can test, and a structure with real substance reads very differently to an examiner than one whose only Montana feature is an address.

For advisors with collector clients, the inventory is short and specific: who holds title, where the car physically sits, what else the out-of-state entity does besides hold an asset, and whether the client's California filings tell the same story. The state is now writing the rule for when that entity counts as a resident, and the entity, not the plate, is what an examiner will test.

For advisors competing on visible tax alpha, domicile questions on titled assets belong on the same list as Roth conversion sequencing and depreciation timing, because a use-tax decision made at a dealership years ago becomes a live line item the moment a legislature changes what counts as residence. Watch what Newsom does with the bill, then check who is on the title.