Three pitfalls you should know before the automobile tax and payment deadline [deadline, car age, procedure]

Have you received the car tax payment form yet? 🍋

In 2026, May 31 is a Sunday, so the payment deadline is June 1 (Monday).

It's an expense that comes every year, but just to know

There are "three" losses and oversights that can be avoided 🌿

▼ Three pitfalls

① Blind spot of deadline

In principle, the payment deadline for 2026 is June 1 (Monday) (June 30 in Aomori and Akita).

Overdue payment (within 1 month 2.4% / over 1 month 8.7% /

After 2026 special standard ratio applied) occurs, also subject to vehicle inspection failure 🍋

Hallsworth 2017 (Journal of Public Economics, cited 328)

In a natural experiment involving over 200,000 people in the UK, a reminder letter

The effect of pushing up payment rates has been proven.

Blind spots of car age

If it exceeds 13 years, it will be subject to heavy charges as a special case for green.

Gasoline vehicles account for about 15%, while minicars account for about 20% (excluding HVs).

If it is a 2.0L car (36,000 yen a year), it will increase by 5,400 yen a year, and the difference will be 54,000 yen in 10 years.

Engström 2015 Tax compliance and loss aversion

According to (106 cited, 3.6 million Swedish tax data),

It has been demonstrated that "advance shortages are strongly recognized as losses."

Blind spots in the procedure

There is no monthly refund system for mini cars (even if you delete your registration on April 2, 10,800 yen will not be refunded even 1 yen) .Residual value setting Tax liability is still with the user (you) even during the loan.

Even if the weight increases with custom, the automobile tax (based on displacement)

It does not go up even 1 yen (only the weight tax at the time of vehicle inspection is affected).

Kahneman & Tversky 1979 Prospect Theory

(Econometrica, cited 36,677) showed

A classic example of "loss feels heavier than gain."

▼ Concept of FSC

Knowing and acting is not the answer today 📝

Even in X, the voices for "the payment slip hasn't come yet" and "the deadline is early" are spreading,

Many people sympathize with the gap between notification timing and deadlines.

Just knowing the three pitfalls can reduce avoidable losses and oversights.

According to your car model, year and holding period,

Is it correct to choose for yourself 🌷

For specific tax calculation and individual tax consultation,

Please consult a tax accountant or the tax office of each prefecture.

This post is for general information purposes.

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Source / Reference

Kahneman, D. (1979) Prospect Theory: An Analysis of Decision under Risk.

Engström, P. et al. (2015) Tax compliance and loss aversion.

Hallsworth, M. et al. (2017) The Behavioralist as Tax Collector, Journal of Public Economics.

Ariely, D., & Wertenbroch, K. (2002) Procrastination, Deadlines, and Performance, Psychological Science.

・ Local Tax Law Article 147 (Automobile Tax Category) / Article 463 (Light Vehicle Tax Category) / Article 148 (Monthly Discount Refund) / Article 64-65 (Delinquent Fee) / Supplementary Provisions (Special Provisions for Greening)

・ Ministry of Internal Affairs and Communications Notification / Each Prefectural Tax Office (Applicable for fiscal year 2026)

Real voice in X (as of April-May 2026 / Representative thread likes 26,595 · Mechanic's outgoing 5,334)

Note: "8.7% per year" is the rate after applying the special standard ratio for fiscal 2026.

The main rule is 7.3% / 14.6% per year.

The tax amount and delinquency rate are based on the local tax law and the Ministry of Internal Affairs and Communications notification as of May 2026.

* 2.0L vehicles are estimated for private passenger cars registered after October 2019 and the standard tax rate.

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