The short version: registering your vehicle in Montana means, in most cases, no sales tax — Montana has no general sales tax, and dealers usually exempt out-of-state buyers from their own state's sales tax. But a handful of states make dealers collect sales tax even on out-of-state sales unless specific steps are taken. If you're buying from a dealer in California, Washington, or Arizona, plan ahead and ask the right questions before you sign.
How sales tax on vehicles usually works
In the U.S., vehicle sales tax is set by each state, not the federal government, and it's generally based on the state where the vehicle is registered.
Dealers are usually required to collect sales tax for buyers they consider in-state (for example, a New York resident buying from a New York dealer).
Out-of-state buyers are usually exempt — the dealer expects you to handle taxes when you register elsewhere. Because you'll register in Montana, which has no general sales tax, there's typically nothing to pay.
Private sellers (individuals, not dealers) don't collect sales tax at all; any tax is handled at registration — and again, Montana has none.
So for most customers, buying out-of-state or from a private seller and registering in Montana means no sales tax. The exceptions below are where extra planning pays off.
The states that need extra planning
California
California dealers must collect California sales tax on vehicles delivered within the state - even to out-of-state buyers.
Dealers can usually exempt a sale from tax when the vehicle is delivered outside California. Common arrangements:
San Francisco Bay Area → delivery to Reno, Nevada
Los Angeles area → delivery to Las Vegas, Nevada
San Diego area → delivery to Yuma, Arizona
Some California dealers also issue a "one-trip permit" that lets an out-of-state buyer drive the vehicle off the lot without paying California sales tax. Ask your dealer about their out-of-state policy before you buy.
Washington
Washington dealers must document a buyer's residency outside Washington, or they're charged the sales tax themselves.
The key point for visitor.us customers: a Montana registration doesn't establish where you personally reside - so Washington will look to your own out-of-state or foreign residency documentation.
Private sellers in Washington don't collect sales tax, so a private purchase avoids this at the point of sale. If you're buying from a Washington dealer, ask exactly what residency documentation they need from you.
Arizona
Like California, Arizona requires dealers to collect Arizona sales tax on vehicles sold within the state, even for out-of-state buyers. Dealers can issue a Tax Exempt Certificate when the vehicle is delivered outside Arizona (often to New Mexico or Nevada).
Other states can change too
This list isn't exhaustive. Other states may have - or may introduce - similar rules requiring dealers to collect sales tax from out-of-state buyers, and enforcement can tighten over time. visitor.us isn't always immediately aware of every state's updates.
Always ask your salesperson upfront whether your purchase qualifies for an out-of-state exemption, what documentation is required, and whether the dealership has handled tax-exempt sales for out-of-state buyers before.
What to say to your dealer
If a dealer assumes you'll register locally and pushes to add sales tax, it usually helps to explain your situation plainly. You're welcome to copy and adapt this:
Hi, I'm registering this vehicle in Montana through a registration service (visitor.us), so it won't be registered in [state]. My understanding is that out-of-state buyers are generally exempt from [state] sales tax. Could you let me know what documentation you need from me to process this as an out-of-state (tax-exempt) sale, and whether delivery outside [state] is required? I'd like to sort this out before we finalize the purchase.
What about Montana's own fees?
Montana's registration fees (including the small Gallatin County tax and, for high-value vehicles, the luxury surcharge) are registration fees — not sales tax — and visitor.us pays them on your behalf at registration. Any that apply to your vehicle are described in Potential Additional Fees.
Buying from a dealership? See also Buying your vehicle from a dealership (link once published) and Can my dealership register my new vehicle in Montana?. Questions about your specific situation? Email [email protected].