The 25-year import rule, explained

The 25-year rule is the reason most Japanese domestic market cars can be imported to the US at all. In one sentence: once a vehicle is 25 years old by its date of manufacture, it is exempt from the Federal Motor Vehicle Safety Standards, and at 21 years old it is also exempt from EPA emission requirements, provided the vehicle is in its original configuration, not modified from the manufacturer's original design. This page explains how the exemptions work, why the build date matters more than the model year, and how to check a car before you buy.

What the rule actually says

New vehicles sold in the US have to meet the Federal Motor Vehicle Safety Standards, which are administered by the National Highway Traffic Safety Administration (NHTSA). A car built for another market does not necessarily meet them. Rather than force every older car through compliance, US rules provide an age exemption: a motor vehicle that is 25 years old or older is exempt from those standards and can be imported.

In practice that is a declaration, not a free pass. The importer still claims the exemption on the paperwork when the car clears customs. The EPA and DOT paperwork page explains which forms are used.

Why the build date matters, not the model year

The exemption is based on the date of manufacture. A car becomes eligible when that specific vehicle is 25 years old — not when its model year is 25 years old. Two cars advertised as the same model year can be built many months apart, so one can be eligible while the other is not.

That is why every serious guide tells you the same thing: check the chassis plate. The plate carries the build information, and the Japanese export certificate should match it. If a seller cannot or will not show you those details, treat that as a warning sign.

The EPA 21-year exemption

Emissions are a separate regime run by the Environmental Protection Agency. Under EPA rules, a vehicle 21 years old or older is exempt from federal emission requirements, but that exemption applies only to vehicles in their original configuration, not modified from the manufacturer's original design. Because 21 is lower than 25, any car eligible under the 25-year rule has already passed the EPA age threshold. Both exemptions are declared on their own forms at import. Confirm current requirements with the EPA's official vehicle-import guidance.

What if the car is younger than 25?

A vehicle under 25 years old normally does not qualify for the safety age exemption. The usual route is for a registered importer to bring the car into conformity with the applicable standards, unless it qualifies under a different exemption. This is a real path, and some enthusiasts use it, but it is slower and more expensive than waiting for a car to age into eligibility. For a first import, a car that clears both age thresholds is by far the simpler choice.

It also helps to know whether a model was ever sold new in the US. A US-market car may already conform and follow ordinary rules, while the Japanese-market version of the same model can differ in specification. The model guides below note where a US-market version existed.

Which of the popular models are eligible?

As of 2026, cars built in 2001 or earlier are generally past the 25-year line, and later builds become eligible as they age. Here is the position for the eight models US buyers ask about most. Always confirm the exact build date on the individual car.

• Nissan Skyline GT-R — C10 onward; the guide lists every chassis code and its eligibility.
• Nissan Silvia — S12 onward; the guide lists every chassis code and its eligibility.
• Toyota Supra MK4 — A60 onward; the guide lists every chassis code and its eligibility.
• Toyota Soarer — Z10 onward; the guide lists every chassis code and its eligibility.
• Toyota Mark II — X70 onward; the guide lists every chassis code and its eligibility.
• Subaru WRX STi — GC8 onward; the guide lists every chassis code and its eligibility.
• Mitsubishi Lancer Evolution — Evolution I onward; the guide lists every chassis code and its eligibility.
• Mazda RX-7 — SA/FB onward; the guide lists every chassis code and its eligibility.

How the rule shapes the rest of the process

Eligibility is the gate, but two other pages pick up where it leaves off. If you plan to buy in Japan rather than from an existing US owner, the Japan car auction guide explains how the cars are sold and graded. If you want to understand the forms that declare the exemption, the EPA and DOT paperwork page covers them. The step-by-step guide ties the whole process together.

Related guides

• How to import a car from Japan — the full process, from eligibility to plates.
• Japan car auctions — where many eligible cars are bought.
• EPA and DOT import paperwork— the forms that declare the age exemption.
• Import a car from Japan — the beginner's guide hub.

General information only — not legal, customs or tax advice. The age thresholds and the rules around them can change. Confirm current requirements with NHTSA, the EPA and US Customs and Border Protection before importing.