How to File an Income Tax Return in Japan: 2026 Rules, e-Tax, Deadlines & Foreign Residents

Japan's final income tax return is called kakutei shinkoku (確定申告). It reconciles national income tax for income earned from January 1 through December 31 after accounting for deductions, credits, withholding and estimated payments.

Before entering numbers, answer three separate questions: what your Japanese tax-residence status is, what income falls within Japan's taxable scope for you, and whether you are legally required to file a final return. These questions are especially important for foreign residents because immigration status and tax-residence status are not the same thing.

The National Tax Agency generally treats a person as a resident if the person has a domicile in Japan or has had a residence in Japan continuously for one year or more. A person who is not a resident is a non-resident. If your living pattern spans countries or changed during the year, do not guess from visa type alone.

• Tax year: January 1 to December 31
• Tax residence: resident, non-permanent resident, or non-resident
• Filing duty: separate from whether tax was already withheld
• Refund filing: possible even when a final return is not legally required

Most wage earners do not file a final return because the employer completes income-tax settlement through year-end adjustment. That does not mean every employee is exempt from filing.

The National Tax Agency lists several filing triggers for wage earners. Important examples include total employment earnings above ¥20 million, one salary payer plus more than ¥200,000 of total income excluding employment and retirement income, and certain cases involving two or more salary payers. The multiple-employer rule is more detailed than simply adding a second job, so check the NTA test rather than using a social-media shortcut.

The ¥200,000 rule is not a general 'tax-free side-income allowance.' It is a national income-tax filing exception under specified conditions. Other filing duties, local inhabitant-tax procedures, or special tax rules can still matter.

• Employment earnings above ¥20 million
• One salary payer plus more than ¥200,000 of qualifying other income
• Two or more salary sources when the NTA multiple-employer test is met
• Income or deductions that were not fully handled by year-end adjustment
• A refund claim that requires filing

The 2026 tax reform raises the basic deduction and the minimum employment-income deduction for 2026 income. The reform is generally effective for 2026 income and affects the December 2026 year-end adjustment; withholding through November 2026 continues under the prior monthly withholding treatment, with reconciliation later.

For 2026 and 2027, the basic deduction for a resident with total income of ¥1.32 million or less is ¥1.04 million. Other income bands have different deduction amounts, and high-income rules continue to apply. The minimum employment-income deduction is raised from ¥650,000 to ¥740,000, with detailed transition calculations for lower salary ranges.

Do not manually reuse a 2025 tax table for a 2026 return. The NTA Filing Assistance system is designed to apply current calculations, which is one reason it is safer than copying numbers from an old article or spreadsheet.

• 2026 reform applies generally to 2026 income
• Basic deduction amounts depend on total income
• Minimum employment-income deduction rises to ¥740,000
• December 2026 year-end adjustment reconciles the new rules for employees
• Use current NTA calculations for the 2026 return

A resident who is not a non-permanent resident is generally taxed in Japan on income from both Japan and overseas. A non-resident is generally taxed only on Japanese domestic-source income, subject to the detailed rules and any applicable tax treaty.

A non-permanent resident is a resident who does not have Japanese nationality and whose total period of domicile or residence in Japan during the previous ten years is five years or less. The taxable scope for foreign-source income is narrower than for other residents and depends in part on whether foreign-source income is paid in Japan or remitted to Japan.

Overseas salary, freelance work, investments, pensions, rental income, stock transactions and foreign tax paid can create issues that are not resolved by looking only at your Japanese withholding slip. Residents who paid qualifying foreign income tax may be able to claim a foreign tax credit, but the credit has limits and supporting-document requirements.

• Do not use visa status as a substitute for tax-residence analysis
• Check whether you are a resident, non-permanent resident, or non-resident
• List overseas income before deciding it is outside Japanese tax
• Keep foreign tax statements when a foreign tax credit may apply
• Check the relevant tax treaty for cross-border income when necessary

Filing becomes much faster when you collect documents first. Salary employees should gather every withholding slip (gensen chōshūhyō), including slips from former employers and secondary jobs. Freelancers and side-business earners need reliable income and expense records rather than only bank totals.

Also gather certificates for deductions or credits you plan to claim. Depending on your situation, this can include social-insurance payments, life-insurance deductions, medical-expense information, donation records, housing-loan documents, dependent information and foreign-tax documents.

Keep the underlying evidence even when e-Tax does not require you to mail every document. The return should be reproducible from your records if the tax office asks a question later.

• All salary withholding slips for the year
• Business, freelance and side-income records
• Expense records and receipts where relevant
• Social-insurance and other deduction certificates
• Medical, donation or housing-loan records when claiming those items
• My Number information and e-Tax authentication tools
• Foreign-income and foreign-tax documents for cross-border cases
• Bank details for a refund

For many individuals, the simplest filing route is the National Tax Agency's Filing Assistance system. With a My Number Card and a compatible smartphone, you can prepare the return by following the prompts and submit it electronically through e-Tax. A computer can also be used, including smartphone-based My Number authentication for the computer session.

Enter income by source, confirm automatically imported information where available, then enter deductions and credits. Do not treat imported data as infallible: compare it with your own withholding slips and certificates before submission.

Before sending, review the taxable income, tax due or refund, bank information, address, My Number details and every income category. Save a copy of the submitted return and the e-Tax receipt or transmission record.

• Prepare on smartphone or computer
• Authenticate with My Number Card when using the card method
• Enter or import income and deduction data
• Review the calculated result before transmission
• Submit through e-Tax
• Save the return and submission receipt

The general rule for a required final income tax return is February 16 through March 15 of the following year. For 2026 income, that means the standard statutory window is February 16 through March 15, 2027, unless the NTA announces special handling. Always confirm the official filing-season page before the deadline.

A refund return is different. If you are not required to file but are entitled to recover overpaid withholding or estimated tax, the NTA allows a refund filing from January 1 of the following year and generally up to five years from that date.

Do not wait until the ordinary filing season if you are ready to make a refund claim. Conversely, some tax benefits require filing by a statutory deadline, so a five-year refund window should not be treated as a universal extension for every election or deduction.

• Required final return: generally February 16 to March 15 of the following year
• 2026 income: standard window February 16 to March 15, 2027
• Refund return: generally available from January 1 of the following year
• Refund claims can generally be filed for up to five years
• Some special tax treatments have their own deadline conditions

A second employer, freelance work, online sales, consulting, creator income, investment income or other side activity can change both the need to file and how income is classified. Classification matters because revenue, deductible expenses, losses and withholding can be treated differently by income type.

For two or more salary payers, use the NTA's wage-earner filing test. For non-employment income, calculate income rather than simply comparing gross revenue with ¥200,000. Income generally means the amount after allowable expenses where the relevant tax rules permit them.

If a side activity is substantial, recurring or business-like, recordkeeping becomes especially important. Do not invent expenses, mix private spending into business costs, or assume every purchase related to work is fully deductible.

• Separate salary from non-salary income
• Use income, not just gross receipts, for the relevant filing tests
• Keep evidence for deductible expenses
• Record tax already withheld from freelance or other payments
• Check local inhabitant-tax procedures even when a national filing exception applies

A final return can reduce tax when you qualify for deductions or credits that were not fully reflected in withholding or year-end adjustment. Common examples include medical-expense deductions, qualifying donations, certain social-insurance payments, dependent-related deductions and the first-year housing-loan credit.

Eligibility depends on the specific statutory conditions. A payment being personally important does not automatically make it deductible, and a deduction is not the same as receiving the full amount back in cash.

For overseas dependents or foreign documents, additional proof and translation requirements can apply. Prepare those records early rather than discovering the documentation rule at the end of the filing process.

• Check the exact eligibility test for each deduction or credit
• Avoid counting items already fully handled in year-end adjustment unless the return requires them
• Keep certificates and supporting documents
• Prepare foreign-dependent documentation early
• Do not confuse a tax deduction with a yen-for-yen refund

Submitting the return does not mean the tax office will later send a bill. If the return shows income tax due, you are responsible for paying it by the applicable deadline.

The NTA offers several methods, including account transfer, direct payment through e-Tax, internet banking, credit-card payment and smartphone-app payment, as well as certain cash options. Credit-card payment carries a settlement fee and has transaction limits. Smartphone-app payment is intended for tax amounts of ¥300,000 or less.

Choose the payment method before the last day so you have time to complete any required registration. Save payment evidence together with your filed return.

• Account transfer after advance setup
• Direct payment through e-Tax
• Internet banking or ATM payment
• Credit card through the designated payment site
• Smartphone-app payment for eligible tax amounts up to ¥300,000
• Cash payment methods when needed

If the return shows a refund, make sure the receiving bank details are accurate. The NTA lets taxpayers with the necessary e-Tax access check refund-processing status through the e-Tax web service.

During filing season, paper returns can take longer to process. The NTA states that electronically submitted refund returns are generally processed faster, although corrections, missing documents or separately mailed evidence can extend the timeline.

Keep the final return, calculation details, withholding slips, supporting records and the e-Tax submission receipt together. Those records are useful for later resident-tax questions, visa or loan paperwork, future returns and any tax-office inquiry.

• Verify the refund account before submission
• Check refund status in e-Tax when available
• Keep the filed return and submission receipt
• Retain the documents used to calculate income and deductions

The National Tax Agency provides filing guidance, online assistance and telephone consultation. Tax offices also provide filing-season support, but appointment or admission procedures can vary, so check the official information for your local tax office before visiting.

Consider a licensed tax accountant (zeirishi) when the return involves significant overseas income, business bookkeeping, property, complex investments, departure from Japan, a tax treaty, large deductions, or uncertainty about tax residence. A professional should be given complete records, including information that you think may be non-taxable, so the conclusion is based on the full facts.

If you will leave Japan while still having Japanese tax filing obligations, separate departure rules can apply, including appointment of a tax agent or a return before departure in certain cases. Do not assume the ordinary March deadline automatically covers a departure-year case.

• Use NTA online and telephone guidance for ordinary filing questions
• Check local tax-office access rules before visiting
• Use a zeirishi for complex cross-border or business cases
• Review departure-year filing rules before leaving Japan