发过了啊。非移民临时来美1年之内不用管，直接开。移民来美超过1年，需要去注册+补税(if there is any)。

美国居民有纳税义务。外国买的东西过了海关都要合法申报。

Yes, you can drive a Canadian-registered car into the U.S. for temporary personal use (up to one year) as a non-resident, but you must comply with U.S. Customs (CBP) entry procedures, have proper documents (passport, registration, insurance), and ensure the vehicle meets U.S. /navSafety and Emissions Standards (DOT/EPA) or be prepared to export/modify it, with permanent importation requiring significant compliance efforts. 

 

For Temporary Visits (Up to 1 Year)

• Entry: Declare the vehicle at a U.S. Port of Entry with U.S. Customs and Border Protection (CBP).
• Documents Needed: Your passport, Canadian driver's license, vehicle registration, and proof of Canadian auto insurance.
• Regulations: The vehicle must meet U.S. safety (DOT) and emissions (EPA) standards, though many Canadian cars have exemptions for temporary stays if they're not staying permanently.
• Duration: You can use it duty-free for up to one year, but it must be exported from the U.S. by the end of that period. 

 

For Permanent Importation (Becoming a Resident)

• Compliance: The car must meet all U.S. Federal Motor Vehicle Safety Standards (FMVSS) and EPA emissions standards, which often requires modifications and a compliance letter from the manufacturer.
• Documentation: You'll need specific forms (like EPA Form 3520-1, DOT HS-7), a performance bond, and possibly a smog certificate for California.
• California Specifics: California has strict requirements, often needing a letter from the California Air Resources Board (CARB) and a smog check by a licensed referee. 

Key takeaway: Driving in temporarily is straightforward if you're not staying long; permanent importation is complex and costly due to strict U.S. vehicle standards, especially in California. 

https://www.cbp.gov/travel/international-visitors/know-before-you-visit/customs-duty-information