Japan’s FY2026 Tax Reform – Part 5 Tax Points Foreign Residents Often Miss

Even with recent tax reforms, many tax troubles involving foreign residents in Japan come from misunderstandings, not from the tax rate itself.

Below are foreigner-specific points to be careful about.

1. “Same tax rules as my home country” is a dangerous assumption

Japan’s tax system is very different from many countries.

Common misunderstandings include:

• Assuming all income is taxed only when paid

• Believing deductions work automatically like in other countries

• Thinking year-end adjustment covers all situations

In Japan, who must file a tax return depends on income type and residency status.

2. Residency status matters more than nationality

In Japan, tax is based on:

• Tax residency, not citizenship

• Length of stay and living situation

Two foreigners with the same income may be taxed very differently.

This point is often overlooked and causes incorrect filings.

3. Overseas income is often forgotten

Foreign residents may need to report:

• Overseas salary

• Rental income abroad

• Investment income earned outside Japan

Even if the money is not brought into Japan, reporting may still be required, depending on residency status.

4. Not everyone is covered by year-end adjustment

Many foreign employees believe:

“My company did year-end adjustment, so I’m done.”

This is not always true.

You may still need to file a tax return if you:

• Have side income

• Change jobs during the year

• Claim certain deductions

• Receive income from overseas

5. Using unqualified tax help is risky

During tax season, foreign residents sometimes rely on:

• Friends

• Interpreters

• Consultants without tax licenses

In Japan, only licensed tax accountants (Zeirishi) may prepare tax returns for others.

Using unqualified help can lead to:

• Penalties

• Additional tax

• Long-term problems with tax authorities

Why this matters now

As tax rules become more detailed:

• Small mistakes can have bigger consequences

• Early understanding prevents stress later

The recent tax reforms make awareness more important, not less.

What’s next?

Next, we will explain:

• How to prepare properly as a foreign resident

• What documents and information you should keep

※ Note: Japanese tax law is strict about filing responsibility, even when mistakes are unintentional.