Vehicle Weight Tax Calculator (Japan)

Select your vehicle weight class (for regular/compact cars) or kei car, the inspection type (new registration or renewal), and the eco-car tax reduction category to estimate Japan's vehicle weight tax, including the 13-year and 18-year aged-vehicle surcharge.

Tips

  • Check the "vehicle weight" field on your vehicle inspection certificate (shaken-sho) and choose the nearest bracket rounded up (e.g. 0.5t or less, 1.0t or less).
  • Choose "New registration (3 years)" right after buying a brand-new car, and "Renewal inspection (2 years)" for every shaken after that.
  • The eco-car reduction category is decided only at first registration. To confirm which category applies at a renewal inspection, check the tax amount printed on your shaken paperwork or tax notice.
  • For kei cars at renewal inspection, this tool does not support the 50%/25% reduction tiers because reliable sources disagreed on the exact amounts. Only exempt, standard, over-13-year, and over-18-year are supported.
  • The aged-vehicle surcharge (13-year / 18-year) applies uniformly to older cars regardless of environmental performance, and can never apply together with the eco-car reduction.

Frequently asked questions

The vehicle weight tax is a national tax based on vehicle weight, paid in a lump sum at every shaken (vehicle inspection). Automobile tax / kei car tax, on the other hand, are prefectural / municipal taxes based on engine displacement or vehicle type, paid annually. Both are required to keep a car on the road in Japan.

The eco-car reduction mainly applies at a new car's first registration (covering the first 3 years). Some highly fuel-efficient vehicles keep the reduction through the next shaken, but most cars revert to the standard rate from the second renewal inspection onward.

To encourage owners to replace older, less efficient vehicles, Japan applies a surcharge to both the vehicle weight tax and automobile tax once a car passes certain age thresholds since first registration. The policy aims to accelerate the shift toward vehicles with better emissions and fuel efficiency.

If a car is permanently deregistered (eikyū-masshō tōroku) with more than one month remaining on its current shaken, the remaining portion of the vehicle weight tax can be refunded. A temporary deregistration alone does not qualify, so check with your local transport bureau or an administrative scrivener (gyōsei shoshi) for the exact procedure.
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Side Note — Why the vehicle weight tax is based on weight

The vehicle weight tax was created in 1971 to fund road construction and maintenance, on the reasoning that heavier vehicles put more strain on paved roads — hence weight as the tax base. It was originally an earmarked tax dedicated to road projects, but a 2009 tax reform folded it into general revenue, so today the money can be used for any government purpose.

The eco-car tax reduction was introduced in 2009 to encourage owners to switch to more environmentally friendly vehicles. It grants exemption, 25%, 50%, or (for kei cars only) 75% reductions depending on how far a vehicle exceeds current fuel-efficiency standards — and because those standards are revised every few years, a model that once qualified can lose its eco-car status after the benchmark is tightened.

The 13-year and 18-year aged-vehicle surcharge works in the opposite direction, raising the tax burden on older cars. Owners who carefully maintain the same vehicle for many years sometimes object to paying more purely because of its age, regardless of how well it still runs, which keeps this policy a recurring topic of debate between environmental goals and the realities of long-term car ownership.

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