When You Become a Japanese Tax Resident

When do you become a Japanese tax resident?

Japan taxes residents on worldwide income and non-residents on Japanese source income only. The 183 day rule is where most people start, but it is not the test on its own. A home, a family, or the centre of your economic life in Japan can make you a resident in fewer days, and a treaty tie-breaker can override the domestic count entirely.

For the first five years of the last ten, a foreign resident is usually a non-permanent resident. Foreign income is then taxed only if it is remitted to Japan. After that, worldwide income is taxed with a foreign tax credit.

Why the immigration status and the tax status disagree

The Immigration Control Act and the tax code use different tests. Immigration cares about your status of residence, its conditions, and how long you may stay. The tax code cares about where you live, where your family lives, and where your income is sourced.

That means a person can hold a valid six month Designated Activities status and still be argued into tax residence, or hold a multi-year work status and remain a non-permanent resident for tax. The two systems do not reconcile themselves, and nobody at the immigration counter will explain the difference.

The non-permanent resident rule

A foreign resident who has lived in Japan for five years or less out of the last ten is taxed on Japanese source income plus foreign income that is remitted to Japan. Foreign income that stays abroad is generally not taxed.

This is the most valuable planning point for a new arrival and the one most often missed. It does not last. After five years of the last ten, the remittance rule ends, and worldwide income is taxed with a credit for foreign tax paid.

The counting is done over a ten year window, which means a long absence can restore non-permanent status. That is a fact worth knowing before you assume a break resets nothing.

Digital nomads and the six month assumption

The digital nomad status is structured to sit under 183 days, and for a clean case it does. The assumption fails in three situations.

You lease an apartment rather than staying in short lets. You open a Japanese bank account and use it as your main account. Your spouse or children live in Japan while you travel for work. Each of those is evidence of a home or a centre of life, and any of them can support a residence finding regardless of the day count.

The interaction between the non-permanent resident rule and the digital nomad status is not addressed in published guidance. That is the largest unresolved tax question in the Japanese short stay market, and it should be treated as unresolved when you plan.

The exit tax

Japan taxes unrealised gains on securities and derivatives worth more than JPY 100,000,000 when a resident leaves. A person who has held permanent residence for five years or more is caught even on a temporary departure.

That second sentence surprises people who plan to leave for a year and come back. The exit tax is not a departure tax on your savings, it is a deemed realisation of portfolio gains, and it applies to a group that includes long-term permanent residents.

Pension and health insurance are not optional

Once you have a residence card and an address, enrolment in the national pension and health insurance systems is required. The contributions are income-linked, and unpaid contributions are recorded. From 1 April 2027, compliance with tax and public dues becomes a statutory condition of holding permanent residence, and non-payment can lead to revocation.

For a founder in a loss-making startup, the pension and health contributions are often the largest personal cost of the first two years, larger than income tax.

Watchpoints

1. 183 days is a starting point, not the test. A home and a family can establish residence earlier.
2. Treaty tie-breakers can override the domestic count. Read the treaty, not a blog summary.
3. The remittance rule is temporary. Five years of the last ten, then worldwide taxation.
4. The exit tax applies to portfolios above JPY 100,000,000, and to long-term permanent residents even on a temporary departure.
5. A six month nomad stay is not automatically tax neutral. Accommodation and banking are the usual evidence against you.
6. Pension and health contributions start with the residence card, not with permanent residence.

Sources

• National Tax Agency, residence and non-permanent resident guidance, checked 2026-10-23
• Income Tax Act and related cabinet orders on the non-permanent resident category, checked 2026-10-23
• Immigration Services Agency, PR guideline revision of 1 October 2026, checked 2026-10-23