Expat Tax Residency in Japan Confirm the cited source.

01How does Japan classify individual tax residency?

Japanese tax residency falls under the Shotokuzeihō (Income Tax Act, Act 33 of 1965), administered by the National Tax Agency (NTA -- Kokuzeichō). The law draws three distinct categories based on domicile (jusho), continuous physical presence, nationality, and cumulative years spent in Japan. A person qualifies as a resident if they maintain a domicile in Japan or have been continuously present for one year or more. Non-residents -- those without a qualifying domicile or continuous one-year presence -- pay Japanese tax only on domestic-source income, typically through withholding at source (NTA, "Tax on the Income of an Individual as a Non-Resident in Japan," nta.go.jp).

02What is the non-permanent resident (NPR) category and who qualifies?

Within the resident group, Japan draws a further distinction based on nationality and cumulative presence. A non-permanent resident is a resident who is not a Japanese national and whose aggregate presence in Japan totals five years or fewer within the preceding ten-year look-back window. This is the central framework for most inbound expatriates during their first years in Japan. Once a foreign national's cumulative Japanese presence crosses five years within any rolling ten-year period, they shift automatically into the permanent-resident category for tax purposes -- regardless of whether they hold immigration-status permanent residence. The ten-year window rolls continuously; departure and return count toward the calculation (PwC Worldwide Tax Summaries, Japan -- Individual -- Residence, taxsummaries.pwc.com, reviewed January 2026).

03How is each category taxed on foreign-source income?

The three-tier framework produces sharply different outcomes on foreign-source income:

For non-permanent residents, the NTA defines "remitted to Japan" broadly: direct bank transfers to Japanese accounts, credit-card charges funded from foreign-source income, and indirect benefits drawn from foreign funds while in Japan all constitute remittance. The NTA clarifies that the remittable amount is limited to the portion of funds transferred from abroad that exceeds any non-foreign-source income paid outside Japan in the same year (NTA 2025 Income Tax and Special Income Tax for Reconstruction Guide, nta.go.jp).

04What are the income tax rates and additional levies?

Japan imposes a progressive national income tax with seven brackets ranging from 5% on taxable income up to 1,950,000 yen to 45% on income exceeding 40,000,000 yen. In addition, a Special Income Tax for Reconstruction (surtax) of 2.1% of the calculated national income tax has applied since 1 January 2013 and runs through 2037, raising the effective top national rate on the highest bracket to approximately 45.945%. Local inhabitant tax (prefectural plus municipal) is levied at a standard flat rate of 10% of the prior year's taxable income, assessed by the municipality where the taxpayer resided on 1 January. A per capita forest environmental tax of 1,000 yen per year also applies to residents. The combined top marginal rate -- national 45% plus surtax plus 10% local -- reaches approximately 55.945% on income above 40,000,000 yen (PwC, Japan -- Individual -- Taxes on Personal Income, taxsummaries.pwc.com).

National brackets (FY 2025):
  0 -- 1,950,000 JPY       =>  5%
  1,950,001 -- 3,300,000   => 10%
  3,300,001 -- 6,950,000   => 20%
  6,950,001 -- 9,000,000   => 23%
  9,000,001 -- 18,000,000  => 33%
  18,000,001 -- 40,000,000 => 40%
  40,000,001+              => 45%
Plus: 2.1% surtax on national tax + 10% local inhabitant tax

05What compliance obligations apply, and what is My Number?

All resident individuals -- including non-permanent residents -- who meet filing thresholds must submit an annual kakutei shinkoku (final tax return) by 15 March following the calendar tax year. Employees whose only income is employment from a single employer below 20,000,000 yen, with other income below 200,000 yen, are typically exempt from filing a national return but may still owe a prefectural inhabitant-tax return. Non-permanent residents must itemize Japan-source income and separately identify any foreign-source income paid in or remitted to Japan during the year. Residents with year-end foreign assets exceeding 50,000,000 yen in aggregate must also file a Report of Foreign Assets (Kokugai Zaisan Chosho) by 30 June.

Japan's My Number system assigns every resident -- including foreign nationals registered in the Basic Resident Register -- a 12-digit individual identification number. My Number is required on tax return filings, employer income-reporting documents, and most tax-related transactions. Foreign nationals on a qualifying visa who register at their local municipal office receive a My Number notification by post, typically within two to three weeks. Failure to provide My Number on required documents may result in processing delays or administrative penalties (NTA, nta.go.jp/english/taxes/individual/index.htm).

For individuals whose residency category is unclear -- particularly those recently arrived in Japan, on multi-year assignment, or splitting time between Japan and another country -- the interaction between domicile (jusho), continuous presence, and the ten-year look-back window can produce results that differ from intuitive day-count calculations. A qualified Japanese certified tax accountant (zeirishi) registered with the Japan Federation of Certified Public Tax Accountants' Associations is best positioned to assess specific circumstances, including the remittance calculation for non-permanent residents and foreign-asset disclosure requirements. See also Japan country overview for additional context on Japan's broader tax framework.