Japan Tax Residency Rules: The 183-Day Test
183-day threshold
How the 183-day rule works in Japan
Japan treats anyone with a domicile or 1+ year of residence as a tax resident. The 183 day rule applies mainly to treaty contexts.
Calendar year (January to December). This means your day count resets every January 1. Days from the previous year do not carry over.
If you exceed 183 days, Japan may tax your worldwide income as a tax resident. The exact consequences depend on your personal situation, any applicable tax treaties, and the type of income involved.
How the count works
Japan does not lean on a 183 day rule for domestic residency. Instead, you are a resident (a "kyojusha") if you have a "jusho", which is your domicile or the base of your living, in Japan. Failing that, you become resident if you maintain a "kyoshou", a place of abode, in Japan continuously for one year or more. Domicile is presumed where the centre of your life is.
What counts as a day
The one year test looks for continuous residence. Short trips abroad usually do not break the chain, but a substantial absence with no Japanese base behind you can reset the count.
Beyond the day count
Inside Japanese tax residency there is a further split that matters for foreign income. You are a permanent resident if you are a Japanese national, or a non Japanese person who has had a domicile or aggregate residence in Japan exceeding 5 of the past 10 years. Otherwise you are a non permanent resident, taxed on Japanese source income and on foreign income only when it is paid in or remitted to Japan.
Special tax regimes
Japan does not run a formal expat regime, but the non permanent resident status effectively functions as one. For the first five years of Japanese residency, many newcomers shelter their foreign source income from Japanese tax by simply not remitting it.
Tax treaties
Japanese treaties broadly follow the OECD model. The 183 day rule does appear, but in the employment income article, where it splits taxing rights between Japan and a worker's home country.
Frequently asked questions
Is there a 183 day rule for Japanese tax residency?
Not under domestic law. Japan looks at domicile and continuous one year residence instead. The 183 day rule shows up in tax treaties, where it allocates taxing rights for short term assignees between Japan and their home country.
How does non permanent resident status help?
A non Japanese person with Japanese tax residency for five or fewer of the past ten years pays Japanese tax only on Japanese source income, plus any foreign income that is actually paid into or remitted to Japan. Foreign income kept outside Japan is generally not taxed at all.
Does buying a home in Japan create residency?
It is a strong factor in establishing domicile, but not enough on its own. The NTA looks at the wider picture: where your family is, where your work happens, where your social life sits, and so on.
Official source: https://www.nta.go.jp/english/index.htm
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