Japan has one of the highest combined income tax rates in the world — up to 55.945% at the top. National income tax ranges from 5% to 45%, and a flat 10% inhabitant tax is added on top. Foreign expats benefit from a 'non-permanent resident' status for their first 5 years in Japan, during which only Japanese-source income (plus foreign income remitted to Japan) is taxed — foreign income kept abroad is exempt.
At a glance
Key Facts
National Income Tax Rates
5% to 45% progressive
Inhabitant Tax
10% flat (added on top of national tax)
Combined Top Rate
~55.945% (45% + 10% + 2.1% reconstruction surtax)
Non-Permanent Resident
First 5 years: foreign income kept abroad is exempt
Social Insurance (Employee)
~14–15% total (health + pension)
Filing Deadline
March 15 (for prior calendar year)
Official Authority
National Tax Agency (NTA)
Introduction
Japan's tax system is complex but contains an important concession for new expat arrivals: a 'non-permanent resident' tier that applies for the first five years of Japanese tax residency. During this period, only Japanese-source income — and foreign income actually sent to Japan — is taxed. Foreign income kept in accounts outside Japan is exempt.
This guide covers Japan's three tax residency tiers for foreigners, how national income tax and inhabitant tax combine, social insurance costs, the filing process, and what US citizens in Japan need to understand about their dual filing obligations.
Section 01
Japan's Three Residency Tiers for Foreign Expats
According to the National Tax Agency (NTA), Japan categorises taxpayers into three tiers, each with different taxation scope:
1. Non-Resident (Under 183 Days)
Spend less than 183 days in Japan without establishing a domicile, and you are a non-resident taxed only on Japanese-source income — typically at flat withholding rates (20.42% on most income).
2. Non-Permanent Resident (First 5 Years)
If you have Japanese domicile or reside in Japan for 183+ days but have been resident for fewer than 5 of the last 10 years, you are a non-permanent resident. Tax applies to:
All Japanese-source income
Foreign-source income remitted to Japan (transferred into a Japanese bank account or spent in Japan)
Foreign-source income kept entirely abroad is exempt
This is a significant benefit. An expat who keeps foreign income (dividends, rental, investments) in overseas accounts during their first 5 years in Japan pays no Japanese tax on that income.
3. Permanent Resident (5+ Years)
After residing in Japan for more than 5 of the last 10 years, you become a permanent resident for tax purposes and pay Japanese tax on worldwide income — including all foreign income whether remitted or not. Planning the transition from non-permanent to permanent status is important for expats with significant foreign assets.
Section 02
National Income Tax Rates 2026
Japan's national income tax (所得税, shotokuzei) uses seven progressive brackets, plus a 2.1% special reconstruction surtax on income tax (in place through 2037 to fund earthquake recovery):
Taxable Income (JPY)
National Tax Rate
Up to 1,950,000
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%
Above 40,000,000
45%
At JPY 10,000,000 (approximately $65,000 USD), the effective national income tax rate is approximately 22–25% after standard employment deductions (kyuyo shotoku kojo).
The 2.1% Reconstruction Surtax
An additional 2.1% surcharge on the calculated national income tax applies to all taxpayers through 2037. This is not 2.1% of income — it is 2.1% of your income tax bill. At 33% marginal rate, the effective surcharge adds approximately 0.7% to your total rate.
Section 03
Inhabitant Tax: The 10% That Surprises New Arrivals
On top of national income tax, Japan levies an inhabitant tax (住民税, juminzei) of approximately 10% of taxable income — 6% municipal plus 4% prefectural. This is standard across all municipalities (with minor variations).
The One-Year Lag
Inhabitant tax is assessed on the previous year's income and billed in the current year. This creates an important cash flow issue for new arrivals and departing expats:
First year in Japan: No inhabitant tax bill (your first year's income hasn't been assessed yet)
Second year: Inhabitant tax on your first year's income begins
Year of departure: You owe inhabitant tax on the prior year's income even after leaving Japan — billed to your last Japanese address or employer
Many expats are caught off guard by the inhabitant tax bill that arrives after they have already left Japan. Ensure your employer is aware of your departure date and arrange for settlement.
Section 04
Social Insurance Contributions
Japan has four main social insurance schemes for employees. Total employee contributions are approximately 14–15% of gross salary:
Scheme
Employee Rate (Approx.)
Employer Rate (Approx.)
Health Insurance (Kenko Hoken)
~5.0%
~5.0%
Welfare Pension (Kosei Nenkin)
9.15%
9.15%
Employment Insurance
0.6%
0.95%
Workers' Compensation
0%
Sector-based
Total employee contribution: approximately 14.75% of gross salary. Note that health insurance rates vary slightly by municipality and insurer (Kyokai Kenpo vs company health insurance society).
Pension for Expats
Expats who have contributed to Japan's welfare pension (Kosei Nenkin) and leave Japan permanently can claim a lump-sum withdrawal payment (脱退一時金, dattai ichijikin) within 2 years of departure. The payment is subject to 20.42% withholding tax in Japan, but the bulk of contributions is recoverable. Arrange this through the Japan Pension Service before the 2-year window closes.
Section 05
Filing Your Japanese Income Tax Return
Salaried employees in Japan have income tax withheld at source (gensen choshuu). An annual year-end adjustment (nenmatsu chosei) performed by employers in December reconciles most employees' final liability. Most salaried employees do not need to file a separate return if their only income is employment income.
A separate return (確定申告, kakutei shinkoku) is required if you have:
Income from multiple employers
Freelance or side income above JPY 200,000
Rental income, foreign income, or investment income outside employer withholding
Significant deductible expenses not captured by the employer
Filing deadline: March 15 for the prior calendar year's income. Filing is done online via the NTA's e-Tax system or at your local tax office (Zeimusho). There is no automatic extension — late filing incurs penalties.
Section 06
US Citizens in Japan
US citizens in Japan face dual filing obligations with both the NTA and the IRS. Japan's high combined rates (up to 55.945%) generally mean the Foreign Tax Credit eliminates US tax on Japanese employment income — but filing remains mandatory.
Form 1040: Required annually for all US citizens regardless of Japanese residency
Non-permanent resident interaction: Foreign income kept abroad is not taxed in Japan — but it IS taxed by the US. With no Japanese tax to credit against US liability on that income, the FTC provides no protection. FEIE may help for earned income portions.
Inhabitant tax timing: The one-year lag in inhabitant tax means your FTC amounts differ between the Japanese and US filing years. Track carefully.
FBAR: Required if Japanese accounts exceed $10,000 aggregate
Japan-US Tax Treaty: Provides relief from double taxation and contains specific provisions for pension income and government employees
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What is Japan's non-permanent resident status and who benefits?
Non-permanent resident status applies to expats who have been Japanese tax residents for fewer than 5 of the last 10 years. Under this status, only Japanese-source income and foreign income remitted (transferred) to Japan is taxed — foreign income kept in overseas accounts is exempt. This is a significant benefit for expats with dividends, rental income, or investments held outside Japan. After 5 cumulative years, permanent resident status triggers worldwide income taxation.
Q
What is Japan's combined income tax rate?
Japan's combined top tax rate is approximately 55.945%: 45% national income tax + 2.1% reconstruction surtax on that tax + 10% inhabitant tax. At moderate income levels (JPY 10,000,000 / ~$65,000 USD), the combined effective rate is approximately 32–35% after standard employment deductions. Japan is one of the highest-taxed countries in Asia-Pacific for personal income.
Q
What is inhabitant tax in Japan and when is it billed?
Inhabitant tax (juminzei) is approximately 10% of taxable income — 6% municipal and 4% prefectural. It is assessed on the previous year's income and billed in the current year, creating a one-year lag. New arrivals pay no inhabitant tax in their first year; departing expats receive a bill for the prior year's income even after they have left. Arrange settlement with your employer or local tax office before departure.
Q
Can I recover my Japanese pension contributions when I leave?
Yes. Expats who have paid into Japan's welfare pension (Kosei Nenkin) can claim a lump-sum withdrawal payment (dattai ichijikin) within 2 years of permanently departing Japan. Japan withholds 20.42% tax on the payment. The amount recovered depends on years of contribution — typically worthwhile for expats who contributed for 3+ years. Apply through the Japan Pension Service (JPS) after departure.
Q
When is the Japanese income tax return due?
The Japanese income tax return (kakutei shinkoku) deadline is March 15 for the prior calendar year. Most salaried employees do not file separately — the employer's year-end adjustment (nenmatsu chosei) in December settles their liability. Those with freelance income, foreign income, rental income, or multiple employers must file. Online filing via e-Tax is available and encouraged by the NTA.
Q
Do US citizens in Japan still file US taxes?
Yes. US citizens file annual Form 1040 regardless of Japanese residency. Japan's high combined rates generally produce sufficient Foreign Tax Credits to eliminate US tax on Japanese employment income. However, during the non-permanent resident period, foreign income kept abroad is exempt in Japan but taxable in the US — requiring careful planning to avoid gaps in FTC coverage. Use a US expat tax specialist experienced in Japan.
Q
Is Japan's social insurance mandatory for foreign employees?
Yes. Foreign employees working for Japanese employers are generally required to enrol in Japan's social insurance system (health insurance, pension, employment insurance). Japan has totalization agreements with many countries — if an agreement exists with your home country, you may continue contributing to your home country system and be exempt from Japanese pension contributions. Always confirm with your employer's HR.
Disclaimer:This guide provides general information about Japanese taxation for expats for educational purposes only. Tax rules change frequently and individual circumstances vary significantly. Always verify current requirements with the National Tax Agency (NTA) or a qualified Japanese tax adviser. This is not tax advice.