The California Driver Handbook says you have 20 days to register your vehicle after you become a resident or get a job in California. Every vehicle registered in California must meet California requirements, including emission controls. The handbook says DMV cannot register a vehicle that does not qualify. When you buy a vehicle, a separate sentence on the same page gives you 10 days to transfer ownership into your name.
Liability insurance is required to register. The Department of Insurance guide revised February 2025 (Form 901) states the minimum as $30,000 for the death or injury of any one person, $60,000 for the death or injury of more than one person in any one accident, and $15,000 for damage to the property of other people.
What has to happen, in order
- Get liability coverage at those February 2025 minimums. The guide says the insurer tells DMV if you buy coverage or stop paying.
- Get a California Smog Check if BAR's first-registration rule applies to your car. See the inspection section. Out-of-state smog certificates are not described as a substitute on the BAR page.
- Have the vehicle identification number verified. The handbook does not itself describe the VIN step. BAR's first-registration paragraph says the inspection also confirms that aftermarket parts meet California requirements. Ask the DMV office whether a separate VIN verification form is required in addition to the smog certificate.
- Apply at a DMV office within 20 days of residency or employment. Bring the out-of-state title. The use-tax section below applies if you purchased the car out of state. The handbook does not print a registration fee. Use the DMV fee page when you apply.
Inspections
BAR's Smog Check page says a Smog Check is required to register a vehicle for the first time in California. It names two cases: a vehicle purchased in another state, and a vehicle previously registered in another state. The inspection is to show the vehicle meets California emissions standards and that aftermarket parts meet California requirements.
On that same page, the model-year exceptions are narrower than a blanket "new cars are exempt." Gasoline, hybrid, and alternative-fuel vehicles eight model years and newer do not need a Smog Check for vehicle registration renewal. They pay a smog abatement fee instead. Vehicles four model years and newer do not need a Smog Check for a change of ownership. They pay a smog transfer fee. BAR says there are no model-year exceptions for diesel vehicles in that exceptions section. Diesel vehicles that need a Smog Check are model year 1998 and newer, and diesels with a gross vehicle weight rating over 14,000 pounds do not need one. Electric vehicles and motorcycles do not need a Smog Check. Gasoline vehicles 1975 and older do not.
The DMV smog page lists a gasoline vehicle less than eight model years old as not needing a smog inspection, and it does not add the words "renewal only" to that bullet. Because BAR and DMV describe the exception differently, this page does not treat a newer out-of-state car as exempt. Confirm with both agencies. No mileage exemption is stated on either page.
A failed smog check goes to the BAR referee program, and some owners can apply to the Consumer Assistance Program. The station must charge an $8.25 certificate fee. BAR says inspection prices otherwise are not regulated. A passing certificate is sent electronically to DMV and is valid for 90 days. Active-duty military and veterans are not exempt from the smog inspection. The DMV smog FAQ says that directly.
Tax
DMV's registration procedures say a person who purchases a vehicle out of state may claim credit toward California use tax for sales or use tax paid to another state, a political subdivision, or the District of Columbia before the vehicle enters California. File form REG 256. The credit cannot be larger than the California use tax. If you cannot certify that tax was paid, or you do not want the credit, DMV collects the use tax in the usual way. No credit is given for tax paid to a foreign country or to a U.S. territory such as Guam or Puerto Rico. The credit section does not state the rate. Ask DMV for the rate that applies at your address.
The procedures page speaks to a purchase. It does not say that a car you already owned and titled in your name, and on which you are not claiming a purchase, is taxed again at the border. Confirm that distinction with DMV when you are transferring a car you already own rather than a car you just bought.
Heavy vehicles and cars built for sale abroad
CARB's Clean Truck Check fact sheet says the program applies to nearly all diesel and alternative-fuel heavy-duty vehicles with a gross vehicle weight rating over 14,000 pounds that operate on California public roads, even if they are not registered in California. Those vehicles must be reported, pay the annual fee, and pass emissions tests. A DMV registration hold can block a California registration that is not in compliance. That fact sheet is about heavy vehicles, not a typical passenger car.
CARB's FAQ on vehicles first sold outside the United States says grey-market cars are typically not able to be registered in California, with requirements that change by model year. That FAQ does not answer whether a U.S. 49-state car can be registered. The DMV handbook's rule is the one that applies until CARB or DMV says otherwise: DMV cannot register a vehicle that does not qualify.
A shipped car
The 20-day period runs from residency or employment, not from the day you drove across the state line. A car that arrives on a truck still needs the California Smog Check before DMV will finish a first registration, unless DMV confirms an exception the BAR page did not state for that transaction. See car shipping in California, the cost calculator, and California emissions after a move.