Tax Residency in Japan: What Foreigners Need to Know

How it works 仕組み

Before Japan can tax you, it needs to determine what kind of taxpayer you are. Unlike many countries where citizenship or visa status drives tax obligations, Japan bases everything on residency — specifically, whether you have a 住所 (domicile) or 居所 (place of residence) in Japan, and how long you have been here.

Your tax residency status determines one critical thing: what income Japan can tax. A non-resident is only taxed on Japan-source income. A resident who has been here less than 5 years (a "non-permanent resident") is taxed on Japan-source income plus any foreign income that is remitted to Japan. A permanent resident for tax purposes — someone who has been in Japan for 5 or more years out of the last 10 — is taxed on worldwide income, regardless of where it was earned or whether it was brought into Japan.

This three-tier system is defined in 所得税法第2条 (Income Tax Act Article 2) and 所得税法第7条 (Article 7), which specifies the scope of taxable income for each category. Understanding which tier you fall into is the single most important step in figuring out your Japanese tax obligations.

Resident vs non-resident 居住者と非居住者

Japan classifies individual taxpayers into three categories. Each determines how much of your income Japan can tax.

How Japan determines if you are a "resident"

The test is straightforward: do you have a 住所 (domicile) in Japan? A domicile is where you have your primary base of living — where your family lives, where your belongings are, where you return to after work. If you have an apartment in Japan, work here, and your daily life centers on Japan, you have a domicile here.

If you do not have a domicile but have maintained a 居所 (place of residence) in Japan continuously for one year or more, you are also treated as a resident. The NTA generally considers anyone who has been physically present in Japan for 1 year or more — or who arrived with the intent to stay for 1 year or more — to be a resident from the date of arrival. (国税庁タックスアンサー No.2012)

Non-residents are taxed at a flat rate (typically 20.42%) on Japan-source income, with no access to most deductions or the progressive tax brackets available to residents. This is important if you are doing short-term contract work in Japan or receiving income from Japanese sources while living abroad.

The 5-year rule 5年ルール

The 5-year rule is the most consequential threshold for foreign residents in Japan. Here is how it works:

• ● Japan looks at the last 10 years from the current date
• ● Within that 10-year window, it counts how many years you had a domicile or residence in Japan
• ● If the total is 5 years or less, you are a 非永住者 (non-permanent resident for tax purposes)
• ● Once it exceeds 5 years, you become a 永住者 (permanent resident for tax purposes) and owe tax on worldwide income

The counting is cumulative, not consecutive. If you lived in Japan for 3 years, left for 2 years, and came back for another 3 years, your total within the last 10 years would be 6 years — making you a permanent resident for tax purposes. Gaps in residency do not reset the clock, but years spent outside Japan do not count toward the 5-year total.

When exactly does the switch happen?

The transition from non-permanent resident to permanent resident for tax purposes happens on the specific day that your cumulative residency exceeds 5 years. It is not based on calendar years or tax years — it is calculated on a daily basis. In practice, this means the change can happen mid-year, and you may need to report differently for the period before and after the transition within the same tax year.

The NTA does not send you a notification when you cross the 5-year threshold. It is your responsibility to track this and adjust your tax reporting accordingly. Many foreigners are unaware of this transition until they are audited — which can result in back taxes and penalties on unreported foreign income.

Worldwide income 全世界所得

Once you become a permanent resident for tax purposes, Japan taxes you on all income worldwide — regardless of where it was earned, where it is held, or whether you bring it into Japan. This is a significant shift from the non-permanent resident status.

What counts as worldwide income?

• ● Foreign salary or business income — remote work for overseas clients, income from a business you own abroad
• ● Investment income — dividends from US stocks, capital gains from selling shares on foreign exchanges, interest from overseas bank accounts
• ● Rental income — rent collected from property you own in your home country or elsewhere
• ● Pension income — distributions from foreign pension plans or retirement accounts (e.g., US 401k, UK pension)
• ● Cryptocurrency gains — profits from trading crypto on foreign exchanges

What about non-permanent residents and "remittance"?

If you are a non-permanent resident (非永住者 — less than 5 years in the last 10), foreign-source income is only taxed if it is remitted to Japan. But the definition of "remitted" (国内において支払われ、又は国外から送金されたもの) is broader than most people assume.

"Remitted to Japan" includes:

• ● Wire transfers from an overseas bank account to a Japanese bank account
• ● Using a foreign credit card in Japan (the payment effectively brings foreign funds into Japan)
• ● Bringing physical cash into Japan from abroad
• ● Having a foreign employer deposit salary into your Japanese bank account

Tax treaties 租税条約

Japan has signed tax treaties (租税条約) with over 80 countries. These treaties are designed to prevent double taxation — being taxed on the same income by both Japan and your home country — and to establish rules for which country gets to tax what.

Tax treaties can override domestic Japanese tax law. Key provisions typically include:

• ● Foreign tax credits (外国税額控除): If you paid tax on income in another country, Japan gives you a credit against your Japanese tax for the foreign tax paid — preventing the same income from being taxed twice. You claim this on your 確定申告.
• ● Reduced withholding rates: Treaties often reduce the withholding tax rate on dividends, interest, and royalties. For example, the US-Japan tax treaty reduces dividend withholding to 10% (from the standard 20.42%).
• ● Pension exemptions: Some treaties specify that government pensions are only taxable in the country that pays them. Private pensions may have different rules.
• ● Teacher/researcher exemptions: Several treaties include provisions that exempt teachers or researchers from taxation for the first 2 years in Japan.

Common treaties that affect foreigners in Japan include those with the United States, United Kingdom, Australia, Canada, Germany, France, South Korea, China, India, and the Philippines. Each treaty is unique, so you should review the specific treaty that applies to your home country. The Ministry of Finance publishes the full text of all treaties on its website.

Dual residency 二重居住

It is possible to be considered a tax resident of both Japan and your home country simultaneously. This happens more often than you might think — for example, if you maintain a home, bank accounts, and family ties in your home country while living and working in Japan.

When dual residency occurs, the applicable tax treaty provides tie-breaker rules to determine which country has primary taxing rights. These rules are applied in order:

1. Permanent home: Where do you have a permanent home available to you? If only in one country, that country wins.
2. Center of vital interests: If you have homes in both countries, where are your personal and economic relationships closer? Consider family, job, social activities, and political/community involvement.
3. Habitual abode: If vital interests are unclear, which country do you spend more time in?
4. Nationality: If all else is equal, your nationality determines it.
5. Mutual agreement: If nationality does not resolve it, the two countries' tax authorities negotiate.

A common scenario: a US citizen living in Japan. The United States taxes its citizens on worldwide income regardless of where they live. Japan also taxes residents on worldwide income (once the 5-year threshold is crossed). The US-Japan tax treaty and the foreign tax credit mechanism exist precisely for this situation — but navigating both countries' filing requirements simultaneously is not trivial. US citizens in Japan must still file US Form 1040 annually and may also need FBAR (FinCEN 114) reporting for foreign bank accounts exceeding $10,000.

Frequently asked questions よくある質問