What Is the Foreign Tax Credit in Japan (2026): Eligibility, Limits, Carryover, Documentation & How to Claim

If you earn income abroad while living in Japan, understanding what is the foreign tax credit in Japan is essential to avoid paying tax twice on the same earnings. Japan’s foreign tax credit (外国税額控除, gaikoku zeigaku kōjo) allows residents, and, in limited circumstances, non-residents, to offset qualifying foreign income taxes against their Japanese tax liability. The core mechanics of the foreign tax credit Japan system remain stable for the 2026 tax year, though taxpayers should confirm the latest filing deadlines and treaty developments before submitting returns. This guide walks through every step: who qualifies, how to calculate the credit limit, what documents to gather, and how to file online or on paper.

Key takeaway: The foreign tax credit is not a refund. It reduces your Japanese tax bill by the amount of qualifying foreign tax you already paid, up to a statutory cap. Any excess may be carried forward for up to three years.

What is the foreign tax credit in Japan?, Purpose and who it helps

Japan taxes its residents on worldwide income. When a resident earns dividends in the United States, rental income in Australia, or consulting fees in the United Kingdom, the source country usually withholds income tax at source. Without relief, that same income would be taxed again in Japan, creating genuine double taxation.

The foreign tax credit exists to eliminate or reduce this overlap. Under Japan’s Income Tax Act and its implementing guidance (NTA No. 12007), a resident who has paid or accrued foreign income tax may deduct that amount from the Japanese income tax otherwise payable, subject to a formula-based cap. The mechanism applies to both national income tax and, separately, to local inhabitant taxes (住民税, jūminzei).

Statutory basis and scope

The legal foundation for the foreign tax credit sits in Article 95 of the Income Tax Act and, for corporations, Article 69 of the Corporation Tax Act. The NTA publishes English-language guidance under reference No. 12007 (residents) and No. 12007-2 (non-residents). The table below summarises the two principal pathways.

In both cases, the credit is non-refundable: it can reduce Japanese tax to zero but cannot generate a cash refund. Any excess is handled through the carryover rules discussed later in this guide.

Who is eligible for the foreign tax credit in Japan? Residents, non-residents and treaty impacts

Eligibility hinges on tax residency status. Japan classifies individuals into three categories, each with different foreign tax credit entitlements.

• Permanent resident (永住者). An individual who has had a domicile or residence in Japan for at least five of the past ten years and holds either Japanese nationality or permanent residence status. Permanent residents are taxed on worldwide income and may claim the foreign tax credit on all qualifying foreign taxes paid.
• Non-permanent resident (非永住者). A foreign national who has had a domicile or residence in Japan for five years or less within the past ten years. Non-permanent residents are taxed on Japan-sourced income plus foreign-sourced income that is paid in Japan or remitted to Japan. The foreign tax credit is available only against tax attributable to that taxable foreign-sourced income.
• Non-resident (非居住者). An individual without a domicile or residence in Japan. Non-residents are taxed only on Japan-sourced income. A foreign tax credit may be available under NTA No. 12007-2 where the non-resident has paid foreign tax on income that is also taxable in Japan, for example, where a treaty allocates taxing rights but does not fully exempt the income.

Double tax treaty considerations

Japan has a network of over 80 tax treaties. Where a treaty provides for an exemption (rather than a credit) method, the treaty provisions override domestic law and the foreign tax credit may not apply. For most major treaty partners, including the United States, the United Kingdom and Australia, the credit method is the default for residents, meaning the domestic foreign tax credit Japan rules apply directly. However, specific treaty articles may cap the rate of foreign withholding tax that qualifies for the credit (commonly 10 % or 15 % on dividends). Taxpayers should always confirm the applicable treaty rate before computing the credit.

Industry observers expect that as Japan continues to renegotiate older treaties, some withholding rates may be further reduced, potentially altering the practical benefit of the foreign tax credit for certain income categories.

What foreign taxes qualify for the credit?

Not every levy paid overseas counts. The NTA requires that the foreign tax be an income tax or a tax substantially similar in nature to an income tax. In practice, the following generally qualify:

• Withholding taxes on dividends, interest and royalties deducted at source by a foreign government.
• Income taxes assessed on net income, including self-assessed foreign income tax and capital gains tax levied by a foreign jurisdiction.
• Surtaxes and local income taxes imposed by foreign sub-national governments, provided they are calculated on income.

The following typically do not qualify:

• Consumption taxes, value-added taxes (VAT/GST), sales taxes and customs duties.
• Social security contributions, even if deducted alongside income tax.
• Penalty interest, late-payment surcharges or fines imposed by a foreign tax authority.
• Taxes that the taxpayer could have avoided by claiming a treaty benefit in the source country but chose not to.

Withholding tax certificates and equivalent proof

For each foreign tax claimed, the taxpayer must hold a withholding tax certificate, tax assessment notice, or equivalent official document issued by the foreign tax authority or the payer. If the original is in a language other than Japanese, the NTA may request a Japanese translation. Keeping the original and the translation together is strongly recommended.

Limit on credit, formula and worked examples

Japan does not allow a full, dollar-for-dollar offset of all foreign taxes paid. Instead, it applies a ceiling, the credit limit, calculated by the following formula set out in NTA No. 12007:

Credit limit = Japanese income tax liability × (foreign-sourced income ÷ total taxable income)

Where “Japanese income tax liability” means the total national income tax for the year (before the foreign tax credit) and “total taxable income” includes both domestic and foreign-sourced income. A separate, parallel calculation applies for local inhabitant taxes.

The foreign tax credit allowed is the lesser of: (a) the actual qualifying foreign tax paid; or (b) the credit limit computed above. If the foreign tax paid exceeds the credit limit, the excess is not lost, it may be carried forward under the carryover rules described in the next section.

Worked example 1, Foreign dividend income

Assume a permanent resident has the following figures for the 2026 tax year:

• Total taxable income: ¥10,000,000
• Foreign-sourced dividend income (U.S. shares): ¥2,000,000
• Japanese national income tax (before FTC): ¥1,500,000
• U.S. withholding tax paid on dividends (treaty rate 10 %): ¥200,000

Credit limit = ¥1,500,000 × (¥2,000,000 ÷ ¥10,000,000) = ¥300,000

Since the U.S. tax actually paid (¥200,000) is less than the credit limit (¥300,000), the full ¥200,000 may be credited against Japanese national income tax.

Worked example 2, Foreign rental income with a higher foreign tax rate

Now assume a different taxpayer earns rental income from a UK property:

• Total taxable income: ¥8,000,000
• Foreign-sourced rental income (UK): ¥3,000,000
• Japanese national income tax (before FTC): ¥1,200,000
• UK income tax paid on the rental profit: ¥600,000

Credit limit = ¥1,200,000 × (¥3,000,000 ÷ ¥8,000,000) = ¥450,000

The UK tax paid (¥600,000) exceeds the credit limit (¥450,000). Only ¥450,000 may be credited in the current year. The remaining ¥150,000 is eligible for carryover.

These examples use simplified figures for illustration. In practice, Japan foreign income tax computations must account for income categories, deductions allocated to foreign-sourced income, and the separate inhabitant-tax credit calculation. A qualified tax adviser can help ensure accuracy.

Carryover rules and ordering of the foreign tax credit in Japan

When the foreign tax paid exceeds the credit limit for a given year, the excess may be carried forward for up to three years. This is often called the excess foreign tax credit carryforward. Conversely, if the credit limit exceeds the foreign tax paid in a year (i.e., there is unused credit capacity), that surplus capacity can also be carried forward for three years to absorb foreign taxes from later periods.

The ordering rule is straightforward: current-year foreign taxes are applied first, then any carried-forward excess from the earliest available year. Taxpayers must track each year’s excess separately and apply them in chronological order (first-in, first-out).

For individuals, no carryback is permitted, unused credits cannot be applied to amend a prior year’s return. Corporations follow the same three-year carryforward window under Article 69 of the Corporation Tax Act, although the calculation of foreign-sourced income and the applicable tax base differ.

Careful record-keeping is essential. If a taxpayer fails to claim the carryforward within the three-year window, the excess lapses permanently. Industry observers note that this three-year window is shorter than the five- or ten-year carryforwards available in some other jurisdictions, making annual monitoring especially important for taxpayers with volatile foreign income streams.

Documentation required, withholding certificates, translations and certified copies

Proper documentation is the single most important factor in a successful foreign tax credit claim. The NTA expects taxpayers to provide evidence that foreign tax was actually paid, that it qualifies as an income tax, and that the amount is correctly stated. The checklist below covers the main requirements.

• Foreign withholding tax certificates (or equivalent statements from the payer or custodian) showing the gross amount, withholding rate, and net payment received.
• Foreign tax assessment notices or receipts for any self-assessed foreign income tax paid directly to a foreign tax authority.
• Japanese translations of foreign-language documents. While not always requested at the time of filing, the NTA may ask for translations during a review. Preparing them in advance avoids delays.
• Computation worksheet showing the credit-limit formula applied, including the breakdown of foreign-sourced income versus total taxable income.
• Applicable tax treaty details (treaty article and rate) where a reduced withholding rate was applied in the source country.
• Prior-year carryforward schedules, if claiming any carried-forward excess foreign tax credits.

Retention period: The NTA recommends retaining all supporting documents for at least seven years from the filing date of the return in which the credit was claimed. This aligns with the general record-retention period for income tax purposes.

How to claim the foreign tax credit in Japan, step-by-step

Residents file for the foreign tax credit as part of their annual self-assessment tax return (kakutei shinkoku). The process can be completed online via the NTA’s e-Tax system or on paper at a local tax office. Below is a step-by-step workflow for the 2026 tax year.

1. Confirm your residency status. Determine whether you are a permanent resident, non-permanent resident or non-resident. This affects which income is subject to Japanese tax and how the credit limit is calculated.
2. Gather foreign tax documents. Collect all withholding certificates, tax receipts and assessment notices for the relevant tax year. Confirm each foreign tax is an income tax (not VAT or social security).
3. Calculate your foreign-sourced income. Identify the gross amount of income arising from sources outside Japan. Apply any directly attributable deductions to arrive at net foreign-sourced income.
4. Compute the credit limit. Apply the formula: Japanese income tax × (foreign-sourced income ÷ total taxable income). Compute the separate inhabitant-tax credit limit if applicable.
5. Determine the allowable credit. The credit is the lesser of foreign tax paid and the credit limit. Note any excess for carryforward.
6. Complete the foreign tax credit schedule. In the e-Tax system, navigate to the “Foreign Tax Credit” section of the return. Enter the details of each foreign tax paid, the source country, the income category, and attach scanned copies of certificates. For paper filings, complete NTA Schedule 6 (別表六) or the equivalent individual-return attachment.
7. Attach supporting documents. Upload (e-Tax) or attach (paper) the foreign withholding certificates, translations, and the computation worksheet. If claiming carryforward credits, include the prior-year schedules.
8. File and confirm. Submit the return by the annual deadline, typically 15 March of the year following the income year (for 2025 income, the deadline is 16 March 2026, as 15 March falls on a Sunday). Confirm receipt via e-Tax notification or tax-office stamp.

How to claim a tax refund in Japan online via e-Tax

The NTA’s e-Tax portal (e-Tax) allows taxpayers to file returns and claim credits online. To use the system, you need either a My Number card with an IC-chip reader, or an e-Tax ID and password issued by a tax office. After logging in, select “Kakutei Shinkoku” (Final Return), enter income details, and navigate to the foreign tax credit section. The system pre-calculates the credit limit once you input the relevant figures.

For non-residents, the process differs: a tax agent in Japan typically files on the non-resident’s behalf, and the foreign tax credit claim is embedded in the agent’s filing. Non-residents without an agent may need to visit a tax office in person.

Municipal inhabitant-tax credit

In addition to the national income tax credit, taxpayers may also claim a foreign tax credit against local inhabitant taxes. This is filed separately through the municipal government, usually by attaching the same documentation submitted to the NTA. The inhabitant-tax credit limit is calculated using the same ratio but applied to the inhabitant-tax liability. Many municipalities accept the NTA’s national-level computation as a reference when processing the local credit.

Common audit triggers and dispute tips

The NTA periodically reviews foreign tax credit claims, particularly where the amounts are large relative to total tax due. Knowing the common triggers can help taxpayers prepare defensible filings.

• Mismatched certificates. Discrepancies between the foreign withholding certificate amount and the figure entered on the return will almost always prompt a query. Double-check currency conversion rates and use the NTA’s prescribed exchange-rate method (generally the telegraphic transfer selling rate on the transaction date).
• Large foreign taxes relative to income. If the foreign tax credit claimed exceeds 30–40 % of total Japanese tax, the return is more likely to be selected for review.
• Missing translations. Filing without Japanese translations of foreign documents is not an automatic rejection, but it delays processing and may trigger a formal request for additional information.
• Double-dipping. Claiming both a foreign tax credit and a deduction for the same foreign tax is not permitted. Taxpayers must choose one method and apply it consistently across all foreign income for the year.
• Failure to apply treaty rates. If a taxpayer paid foreign withholding tax at the statutory rate (e.g., 30 %) when a lower treaty rate (e.g., 10 %) was available, the NTA may limit the credit to the treaty rate. The appropriate remedy is to claim a refund from the foreign tax authority for the excess withholding and adjust the Japanese credit accordingly.

If the NTA challenges a foreign tax credit claim, the taxpayer will receive a written inquiry or correction notice. Responding promptly with complete documentation usually resolves the issue. Where disputes escalate, for instance, disagreements over the characterisation of a foreign tax or the allocation of foreign-sourced income, engaging a qualified Japan tax lawyer is advisable before the matter reaches the formal protest (異議申立て) or litigation stage.

Reporting obligations by taxpayer type, quick comparison

Conclusion and next steps

Understanding what is the foreign tax credit in Japan, and executing the claim correctly, can save expatriates, investors and multinational employees significant amounts of tax each year. The essential steps are straightforward: confirm residency status, gather qualifying foreign tax certificates, calculate the credit limit using the NTA formula, and file through e-Tax or in person before the March deadline. Where foreign taxes exceed the credit limit, carry the excess forward for up to three years to maximise relief.

For complex situations, multi-country income streams, treaty interpretation questions, or NTA audit responses, working with a qualified Japan tax practitioner is the most reliable way to protect your position. The foreign tax credit Japan framework rewards careful preparation; taxpayers who keep complete records and file accurately rarely face issues.

Resources and authoritative references

• NTA No. 12007, Foreign tax credit for residents: official English-language guidance on eligibility, formula, and documentation requirements.
• NTA No. 12007-2, Foreign tax credit for non-residents: rules and credit-limit specifics for individuals without a domicile in Japan.
• PwC Tax Summaries, Japan, Individual foreign tax relief and tax treaties: authoritative interpretation of Japan foreign tax 2026 rules, updated regularly.
• Grant Thornton Japan, Tax Bulletin, Technical commentary on FTC mechanics, including corporate and carryover perspectives.
• JETRO, Taxes in Japan, Investor-facing overview of the Japanese tax system, including branch and corporate FTC provisions.
• NTA e-Tax portal, Official platform for electronic filing of Japanese income tax returns, including foreign tax credit claims.

Sources

1. National Tax Agency (NTA), No.12007 Foreign tax credit for residents
2. NTA, No.12007-2 Foreign tax credit for non-residents
3. PwC Tax Summaries, Japan: Individual foreign tax relief and tax treaties
4. Grant Thornton Japan, Foreign Tax Credit System in Japan (Tax Bulletin)
5. JETRO, Taxes in Japan (investment guide)
6. PwC Tax Summaries, Japan: Corporate tax credits and incentives