Naturalization / Japanese nationality

Japan’s Reported Tightening of Naturalization Screening from April 2026

This article explains the practical points foreign nationals should review when considering naturalization in Japan, including residence period, taxes, social insurance, Japanese-language ability, and settlement in Japanese society.

In late March 2026, news reports stated that the Ministry of Justice would tighten naturalization screening practice from April 1, 2026. This is an important development for foreign nationals who are considering obtaining Japanese nationality.

However, the legal and practical position should be understood carefully. The Ministry of Justice Q&A still explains the general residence requirement as having lived in Japan continuously for five years by the time of application. At the same time, the same Q&A also explains that those requirements are minimum conditions and that sufficient Japanese-language ability and integration into Japanese society, such as having resided in Japan for 10 years or more, are also required.

Therefore, future naturalization consultations should distinguish between the statutory minimum residence requirement of five years and the broader practical question of whether the applicant can demonstrate stable settlement and integration in Japan.

What is reportedly changing from April 1, 2026?

According to media reports, the key points of the reported operational change are as follows:

• Naturalization screening may place greater practical emphasis on approximately 10 years of residence in Japan.
• Tax payment records may be checked more broadly, generally for the past five years.
• Social insurance payment records may be checked more broadly, generally for the past two years.

In other words, applicants should not assume that simply reaching five years of residence is enough. Longer-term settlement, stable livelihood, and proper performance of tax and social insurance obligations may carry more weight than before.

What has not changed?

The most important point is that the wording of the Nationality Act has not simply been rewritten from “five years” to “ten years.” The Ministry of Justice Q&A explains that, as a general condition under Article 5, paragraph 1, item 1 of the Nationality Act, the applicant must have lived in Japan continuously for five years by the time of application.

However, the same Q&A also explains that these are minimum requirements and that satisfying them does not guarantee permission for naturalization. It also states that sufficient Japanese-language ability for daily life and integration into Japanese society, such as having resided in Japan for 10 years or more, are required.

Therefore, in practical terms, applicants should not rely only on the phrase “five years.” They should review whether they can show stable life in Japan, proper tax and social insurance compliance, sufficient Japanese-language ability, and genuine settlement in Japanese society.

Why is Japan tightening naturalization screening?

One commonly discussed reason is consistency with permanent residence. The Immigration Services Agency’s guideline for permanent residence states that, in principle, the applicant must have resided in Japan continuously for 10 years. It also emphasizes proper performance of public obligations, including tax payments, public pension, public health insurance premiums, and notifications under immigration law.

Naturalization and permanent residence are different systems. Permanent residence allows a foreign national to continue living in Japan while keeping foreign nationality. Naturalization, on the other hand, means acquiring Japanese nationality. For that reason, it is natural that naturalization screening places importance on long-term settlement, stable livelihood, tax and social insurance compliance, and integration into Japanese society.

What applicants should check now

1. Do not focus only on the number of years

Even if you have reached five years in Japan, that alone may not be enough in practice. It is wise to review your employment history, periods without work, overseas travel history, income stability, Japanese-language ability, and social ties in Japan before moving forward.

2. Take tax and social insurance compliance seriously

In naturalization screening, conduct and public obligations are important. Delays, arrears, or missed payments in resident tax, income tax, national health insurance, national pension, or employees’ pension may affect not only naturalization but also permanent residence and other immigration-related procedures.

3. Pending cases may require individual review

Even if an application has already been filed and is waiting for a result, additional documents or explanations may be requested. The actual handling of pending cases should be checked carefully based on the applicant’s individual circumstances and the guidance of the relevant Legal Affairs Bureau.

4. Be cautious about exceptions

The Nationality Act includes relaxed conditions for certain foreign nationals who have special connections with Japan, such as spouses of Japanese nationals, children of Japanese nationals, and persons born in Japan. However, even where a relaxed condition applies, tax compliance, social insurance compliance, conduct, livelihood, Japanese-language ability, and settlement in Japan remain important.

Our practical view

From now on, naturalization consultations in Japan are likely to focus even more on the full picture: residence period, tax compliance, social insurance compliance, stable income, Japanese-language ability, family situation, and genuine settlement in Japan.

If you were preparing a naturalization application on the assumption that “five years is enough,” it would be wise to re-check your situation under the stricter practice expected from April 2026.

It is also important not to rely only on headlines. In this type of transition period, applicants should separate the current law, the Ministry of Justice Q&A, consultation guidance from the Legal Affairs Bureau, and the latest practical screening approach.

Conclusion

The reported tightening of naturalization screening from April 2026 may have a significant impact on future applications. At this stage, applicants should distinguish between the published statutory minimum condition of five years and the practical emphasis on integration into Japanese society, including residence of 10 years or more.

If you are considering naturalization, now is the time to review not only your residence period, but also taxes, social insurance, income stability, travel history, Japanese-language ability, family background, occupation, and social ties in Japan.