Avoiding Double Taxation on International Inheritance

When a person with connections to multiple countries passes away, both Japan and the foreign country may claim the right to tax the same inheritance. This can result in a combined tax burden that significantly exceeds what either country would impose alone. This guide explains how Japan's foreign tax credit (外国税額控除, gaikoku zeigaku koujo) and bilateral tax treaties help prevent or reduce double taxation.

Estimate your Japan inheritance tax liability

When Does Double Taxation Occur?

Double taxation on inheritance typically occurs in these situations:

A Japanese resident inherits assets located in a country that imposes its own estate or inheritance tax (e.g., the US, UK, France, South Korea).
A foreign resident inherits assets located in Japan and their home country also taxes worldwide inheritance.
The decedent was a dual national or had residency in both Japan and another country.

Unlimited vs. Limited Taxpayers

Japan classifies inheritance taxpayers into two main categories, which determines the scope of taxation:

Unlimited Taxpayer (無制限納税義務者)

Taxed on worldwide assets. Applies when either the decedent or the heir has a domicile in Japan, or when a Japanese national heir has had a domicile in Japan within the past 10 years.

Limited Taxpayer (制限納税義務者)

Taxed only on Japan-situated assets. Applies when both the decedent and heir are non-Japanese nationals who have not had a domicile in Japan within the past 10 years.

Unlimited taxpayers face the greatest risk of double taxation because Japan taxes their entire worldwide inheritance while the country where the assets are located may also impose tax.

Japan's Foreign Tax Credit (外国税額控除)

Under Article 20-2 of the Inheritance Tax Act, Japan provides a unilateral foreign tax credit that is available regardless of whether a tax treaty exists. The key rules are:

You can credit inheritance tax, estate tax, or similar death duties paid to a foreign government.
The credit applies only to tax paid on assets located in that foreign country.
The credit cannot exceed the portion of Japanese inheritance tax attributable to those foreign assets.
You must provide proof of foreign tax payment (tax receipts or certificates from the foreign tax authority).
The credit is claimed on your Japanese inheritance tax return.

Credit Limitation Formula

Maximum Credit = Japanese Tax x (Foreign Assets Value / Total Worldwide Assets Value)

If the foreign tax paid exceeds this limit, the excess cannot be credited and is effectively lost (no carryforward).

Tax Treaty Countries

Japan has signed bilateral inheritance/estate tax treaties with only two countries:

United States (1954 treaty, amended)

Covers federal estate tax. Provides rules for determining which country has primary taxing rights based on domicile, citizenship, and asset location. Includes a credit mechanism to prevent double taxation.

United Kingdom (2014 treaty)

Covers UK inheritance tax. Establishes clear rules for determining domicile for tax purposes and provides credit relief for tax paid in the other country.

For all other countries (including Australia, Canada, France, Germany, South Korea, and China), there is no bilateral inheritance tax treaty. You must rely solely on Japan's unilateral foreign tax credit. Note that some countries like Australia and Canada do not impose a separate inheritance or estate tax, which naturally eliminates the double taxation issue.

Practical Steps to Minimize Double Taxation

Identify all taxing jurisdictions early. Determine which countries may claim the right to tax the inheritance based on the decedent's domicile, nationality, and asset locations.
Gather foreign tax documentation. Obtain official tax assessment notices and payment receipts from all foreign tax authorities.
File within Japan's 10-month deadline. The foreign tax credit must be claimed on the initial inheritance tax return.
Consult a cross-border tax specialist. International inheritance taxation is highly complex. A tax advisor (税理士) with cross-border experience is essential.
Consider asset restructuring for future estates. Proper estate planning can minimize exposure to multiple jurisdictions.

FAQ

Does Japan have inheritance tax treaties with other countries?

Japan has bilateral inheritance/estate tax treaties with only two countries: the United States and the United Kingdom. However, Japan's income tax treaties with many other countries may provide some relief, and the unilateral foreign tax credit is available regardless of treaty status.

Can I claim a foreign tax credit for estate tax paid in the US?

Yes. Under the Japan-US Estate Tax Treaty and Japan's domestic foreign tax credit provisions, you can credit US federal estate tax paid against your Japanese inheritance tax liability on the same assets. State-level estate taxes may also qualify.

What happens if both countries claim the right to tax the entire estate?

This is common when the decedent or heir has ties to both countries. The applicable tax treaty determines which country has primary taxing rights. Without a treaty, you rely on Japan's unilateral foreign tax credit (外国税額控除), which credits foreign tax paid on overseas assets against your Japanese tax on those same assets.

This guide provides general information only. It does not constitute tax advice or tax filing services. Please consult a licensed tax professional (税理士) for accurate calculations.