Japan Tax Filing Guide 2026 — 確定申告 (Feb 16–Mar 15)

Overview — Who Must File a Final Tax Return

You must file a Kakutei Shinkoku if any of the following apply:

👉 Self-Employed / Sole Proprietor: Anyone with business income (事業所得), freelance income, or professional fees must file. This includes sole proprietors (個人事業主), freelancers, and independent contractors.

👉 Salary Income > JPY 20M: Employees whose annual salary exceeds JPY 20 million must file. Year-end adjustment by the employer does not cover this category.

👉 Multiple Employers: Employees who worked for two or more employers simultaneously and did not have year-end adjustment for the second employer's income.

👉 Investment Income: Those with capital gains, dividends, or interest that were not subject to withholding (or where withholding was not the final tax). Crypto gains (miscellaneous income) always require filing.

👉 Side Income > JPY 200,000: Employees with miscellaneous income (including crypto, freelance side work, rental income) exceeding JPY 200,000 per year must file, even if their main salary was adjusted at year-end.

👉 High Medical/Deduction Claims: Employees who wish to claim deductions beyond the standard deductions (e.g., large medical expenses, mortgage deductions, donations) that exceed the employer's year-end adjustment capacity.

👉 Non-Residents: Non-residents with Japanese-source income must file a non-resident tax return (though many types are handled through withholding).

Year-End Adjustment — 年末調整 (Nenmatsu Chōsei)

The year-end adjustment is a process conducted by employers for most salaried employees:

👉 Employer's Responsibility: Employers calculate the correct annual tax liability for employees based on actual salary paid and deductions claimed (life insurance, mortgage, social insurance, etc.). They adjust the final month(s) payroll to collect the correct total tax for the year.

👉 Eligibility: Employees who: have only one employer, have salary under JPY 20M, and have no side income over JPY 200,000. If all conditions are met, the employee does not need to file.

👉 Deductions Handled: Life insurance premiums (生命保険料控除), earthquake insurance (地震保険料控除), mortgage deductions (住宅借入金等特別控除), social insurance premiums (社会保険料控除), and spouse/dependent deductions (配偶者控除/扶養控除).

👉 Caution: Even if you had year-end adjustment, you still need to file if you have side income over JPY 200,000, capital gains, crypto gains, or wish to claim deductions not covered (e.g., medical expenses exceeding JPY 100,000, Furusato Nozei donations).

Filing Period — February 16 to March 15

The annual tax filing window is strict and late filing carries penalties:

👉 Filing Period: February 16 to March 15 of the year following the tax year. For the 2025 tax year (filed in 2026): February 16 (Monday) to March 15 (Sunday) — deadline extended to March 16 (Monday) in practice.

👉 Early Filing: You can file before February 16 if you are certain of all your income and deductions. Most taxpayers wait for source documents (withholding slips, dividend statements) typically sent by late January.

👉 Late Filing Penalties: Late filing surcharge (無申告加算税): 15% of unpaid tax if filed within 1 month of deadline, 20% if later. Interest on late payment (延滞税): approximately 2.4–8.9% per year depending on the period. If filed after a tax office investigation, up to 40%.

👉 Estimated Filing (予定申告): Self-employed individuals must file an estimated tax return in two installments: July 1–31 and November 1–30 of the current year, based on the previous year's liability. The final return reconciles estimates with actual income.

E-Tax — 国税電子申告・納税システム

E-Tax is Japan's digital tax filing system:

👉 How It Works: File your tax return online through the NTA's E-Tax portal. You need a My Number card (マイナンバーカード) and a card reader, or a digital certificate from the tax office. Smartphone filing is supported using the My Number card's IC chip.

👉 Benefits: Automatic calculation of tax amounts, direct input of withholding slips using data from employers/banks, and faster refund processing (typically 2–3 weeks vs 1–2 months for paper).

👉 My Number Card: Since 2023, the My Number card (or digital certificate) is essentially mandatory for e-Tax filing by individuals. Apply at your municipal office. The card is free for first issuance.

👉 Paper Filing: Paper returns are still accepted. File at your local tax office (税務署) by March 15. Paper returns take longer to process and may require a visit for corrections.

Blue Return vs White Return — 青色申告 vs 白色申告

Self-employed individuals and sole proprietors can choose between two filing systems:

👉 Blue Return (青色申告, Aoiro Shinkoku):

• Requires approval: File the Notification of Approval for Blue Return (青色申告承認申請書) within 2 months of starting the business.
• Special Deduction: Up to JPY 650,000 deduction from business income if you maintain proper bookkeeping (double-entry or simple cash-basis depending on income).
• Loss Carry-Forward: Business losses can be carried forward for 3 years and offset against future business income.
• Family Deductions: Wages paid to family members (青色事業専従者給与) are deductible as business expenses.
• Depreciation: Certain accelerated depreciation methods are available.

👉 White Return (白色申告, Shiroiro Shinkoku):

• No special deduction (JPY 0 instead of JPY 650,000).
• Simpler bookkeeping requirements (single-entry accounting acceptable).
• No loss carry-forward.
• No deduction for family wages.
• Default system if you do not apply for Blue Return.

👉 Recommendation: All self-employed individuals should apply for Blue Return within the first 2 months. The JPY 650,000 deduction alone makes it worthwhile — on JPY 5M of business income, this saves approximately JPY 100,000–200,000 in tax depending on your bracket.

Payment Deadlines and Refunds

After filing your tax return, any balance due or refund is handled as follows:

👉 Tax Due (納税): Any tax balance due must be paid by the filing deadline (March 15). Payment methods: direct debit from a bank account, payment at a bank/ post office using the payment slip issued by the tax office, online via E-Tax with a credit card or online banking, or payment at a convenience store (for amounts under JPY 300,000).

👉 Installments: If you cannot pay the full amount by the deadline, you may apply for a payment plan (延納). Interest accrues on unpaid amounts. The tax office generally requires full payment by the deadline.

👉 Refunds (還付): If you overpaid tax (through withholding or estimated payments), you receive a refund. Refunds are processed after filing. E-Tax filers typically receive refunds within 2–3 weeks; paper filers may wait 1–2 months. Refunds are deposited into your designated bank account.

Deductions and Credits

Key deductions available on your Japanese tax return:

👉 Medical Expenses Deduction (医療費控除): Deduct medical expenses exceeding JPY 100,000 (or 5% of total income, whichever is lower) up to JPY 2M. Includes treatment, prescriptions, hospital stays, dental, and transportation. Cosmetic procedures are not deductible.

👉 Life Insurance Deduction (生命保険料控除): Up to JPY 40,000–120,000 deduction depending on the type of insurance (life, medical, personal pension). The employer handles this through year-end adjustment for salaried employees.

👉 Mortgage Deduction (住宅借入金等特別控除): Up to 1% of the outstanding loan balance (max JPY 400,000/year) for 13 years for qualifying new-build homes. Extended to 15 years for certain certified properties. The deduction reduces your income tax and inhabitant tax.

👉 Furusato Nozei (ふるさと納税): Donations to local governments are deductible (up to approximately 20–30% of your inhabitant tax). The deduction is applied through inhabitant tax reduction, not the final return (for employees with year-end adjustment).

👉 Spouse Deduction (配偶者控除): Up to JPY 380,000 deduction if your spouse's income is under JPY 1.03M (special rules for incomes up to JPY 2.01M). The deduction phases out gradually above this threshold.

FAQ

When is the tax filing deadline in Japan for 2026?

March 15, 2026 (for the 2025 tax year). Since March 15 is a Sunday, the deadline effectively becomes March 16, 2026 (Monday). The filing period opens on February 16, 2026.

Who needs to file a Japanese tax return?

Self-employed individuals, anyone earning over JPY 20M in salary, those with side income over JPY 200,000 (including crypto gains), and those claiming large deductions beyond year-end adjustment (medical expenses, mortgage, etc.).

What is year-end adjustment (年末調整)?

Year-end adjustment is the employer's process of reconciling an employee's annual tax liability. If you have only one employer, salary under JPY 20M, and no side income over JPY 200,000, you generally do not need to file a tax return.

What is the difference between Blue Return and White Return?

Blue Return (青色申告) offers a special deduction of up to JPY 650,000, 3-year loss carry-forward, and family wage deductions, but requires proper bookkeeping. White Return (白色申告) is simpler but offers none of these benefits.

How do I file using E-Tax?

File online through the NTA's E-Tax portal using your My Number card and card reader (or digital certificate). The system auto-calculates tax from your input. Smartphone filing is also supported. Refunds are processed faster with E-Tax.

Can I amend my tax return after filing?

Yes. If you discover an error or omission, file a correction return (修正申告) if you underpaid, or a request for revision (更正の請求) if you overpaid. Time limit: 5 years from the filing deadline for corrections.

What happens if I miss the filing deadline?

Late filing surcharge: 15–20% of unpaid tax. Interest on late payment: ~2.4–8.9%/year. If discovered by the tax office, surcharge can reach 40%. File as soon as possible even if late — penalties increase over time.

Do I need to file if I have only salary income?

Generally no — if your employer conducted year-end adjustment, your salary is under JPY 20M, and you have no other income over JPY 200,000. However, filing may be beneficial if you have large medical expenses, mortgage deductions, or Furusato Nozei deductions not fully claimed.