Japan car tax calculator (自動車税)
Japan's annual automobile tax for cars registered from Oct 2019 is set by engine displacement bands.
Worked example: with 排気量 of 1,496, this model computes 年額 of 30,500 JPY. See the full breakdown.
✓ Verified against 3 self-test cases Updated for 2026 · sources checked 2026-08-05
How 自動車税 in Japan is calculated
Japan's automobile tax (jidosha-zei) is based on engine displacement, from 25,000 JPY for a sub-1.0L car up to 110,000 JPY for the largest engines. Kei (light) cars pay a flat 10,800 JPY.
Cars over 13 years old pay about 15% more. The calculator uses the displacement bands. Estimate, not tax advice.
Worked example
| 排気量 (cc) | 1496 |
|---|---|
| 初度登録からの年数 | 3 |
| 自動車税（排気量別） ✓ | 30500 |
| 13年超の重課 ✓ | 0 |
| 年額 ✓ | 30500 |
Every row is computed by the engine from the inputs above. Rows marked ✓ are additionally pinned by a published self-test vector.
Frequently asked questions
How much car tax for a 1.5L car in Japan?
30,500 JPY a year for an engine up to 1.5L registered from Oct 2019.
Do kei cars pay less?
Yes — light (kei) cars pay a flat 10,800 JPY.
Do old cars pay more?
Cars over 13 years old pay about 15% more.
Sources
- 総務省 — 自動車税 · checked 2026-08-05
Estimate. Not tax advice. The verification badge means the model reproduces the stated formula through 3 self-test cases; the sources support that the formula matches the rules.
Check the arithmetic yourself: how this calculator is verified — the formula behind every derived value, the 3 test cases the engine reproduces, and what the badge does and does not claim. Also available as machine-readable JSON.
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