Montana isn't a state you'd associate with ultra-expensive cars, but more and more luxury vehicles are sporting Montana license plates these days. Here's why.

Registering a new car in Montana has a loophole that allows owners to avoid paying sales tax. The state has the highest number of registered cars per person in the United States.

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Basically, the Utah law says if you or your Montana LLC buys a car that is mostly used and resides in Utah, the sales tax should be paid in Utah and it should be registered here, too.

So, yes, you probably need a car to cross those vast open spaces—but Montana weirdly has the highest car ownership by population in the United States, more than double that of car-crazed California.