Japan to Tighten Naturalization Screening from April 2026? Key Points on the New “10-Year” Practice

On March 27, 2026, news reports said that the Ministry of Justice will tighten its naturalization screening practice from April 1, 2026. This is a major development for foreign nationals who are considering obtaining Japanese nationality.

However, the legal picture still needs to be understood carefully. As of now, Article 5 of the Nationality Act and existing Legal Affairs Bureau guidance still describe the residence requirement as five consecutive years in Japan. At the same time, the latest reports say that, through a change in screening practice rather than an immediate statutory amendment, the Ministry will begin treating roughly 10 years of residence as the new general standard in practice.

What is reportedly changing from April 1, 2026?

According to the latest reports, the key points are as follows:

In practice, naturalization screening will generally require about 10 years of residence in Japan
Tax payment records will generally be checked for the past 5 years
Social insurance payment records will generally be checked for the past 2 years

In other words, it may no longer be enough to say, “I have lived in Japan for five years, so I can apply.” Longer-term residence, stable settlement in Japan, and proper payment of taxes and social insurance are likely to carry more weight than before.

What has not changed yet?

The most important point is that, as of March 27, 2026, the wording of the Nationality Act itself has not suddenly been rewritten from five years to ten years. Existing official guidance and explanatory pages still contain the traditional “five-year” language.

This means applicants should distinguish between the statutory wording and the screening practice that is expected to start on April 1. For some time, public information may look inconsistent because official webpages and local guidance may not be updated all at once.

Why is Japan tightening naturalization screening?

A commonly cited reason is consistency with permanent residence. The general guideline for permanent residence has long been 10 years of residence in Japan. Because of that, some policymakers and commentators have argued that naturalization should not appear easier than permanent residence in terms of the residence period.

The government’s broader policy package had already indicated that naturalization screening would be reviewed more strictly, taking consistency with permanent residence into account. The latest practice change appears to be part of that policy trend.

What applicants should check right now

1. Do not focus only on the number of years

Even if you have reached five years in Japan, that alone may no longer be enough in practice. It is wise to review your employment history, periods without work, overseas travel history, and overall financial stability before moving forward.

2. Take tax and social insurance compliance very seriously

Under the reported change, tax records and social insurance payment records will matter more than before. Delays, arrears, or missed payments in resident tax, national health insurance, national pension, or employees’ pension may affect not only naturalization but also other immigration-related procedures.

3. Even pending cases may require careful review

Some reports say that applicants who have already filed and are still waiting for a result may also be subject to the new practice from April 1. The actual handling of pending cases should be checked carefully on a case-by-case basis.

4. Be cautious about possible exceptions

Reports also say that people with recognized contributions to Japan, such as athletes or researchers, may still have room for exceptional treatment after five years. That said, such exceptions should not be assumed lightly.

Our practical view

From now on, naturalization consultations in Japan are likely to focus even more heavily on the full picture: years of residence, tax compliance, social insurance compliance, stable income, and genuine settlement in Japan.

If you were planning your case on the assumption that “five years is enough,” it would be wise to re-check your situation under the stricter practice expected to start in April 2026.

It is also important not to rely on headlines alone. In this kind of transition period, applicants should separate the current law, existing public guidance, and the latest screening practice actually applied by the authorities.

Conclusion

The tightening of naturalization screening from April 2026 may have a significant impact on future applications. At the moment, we are in a transitional phase where the statutory wording still points to five years, while actual screening practice may move toward a general 10-year standard.

If you are considering naturalization, now is the time to review not only your residence period but also your taxes, social insurance, income stability, and travel history in a comprehensive way.

At Tommy’s Legal Service Administrative Scrivener Office, we assist clients with initial eligibility checks, document planning, and comparisons between naturalization and permanent residence options. Please feel free to contact us through our inquiry form.

投稿者プロフィール

Daisuike Tominaga行政書士 (Immigration Lawyer)

日系理化学機器輸入商社、日系センサーメーカー、外資系真空機器メーカー、外資系化学装置メーカーでの国内外業務を経て、令和2年度行政書士試験に合格。令和3年4月、トミーズリーガルサービス行政書士事務所を開業。

現在は入管業務（VISA・在留資格）を中心とした専門事務所として、外国人の雇用・受け入れ、企業の国際人材戦略、在留手続のオンライン申請支援を行う。
企業・個人いずれのクライアントにも寄り添い、迅速・丁寧で負担の少ない手続きをモットーとする。

また、国際業務の経験を生かし、英語での各種案内・申請支援にも対応。

趣味：バイク（CB1300SB）、ツーリング、テニス、ゴルフ

English:
After working in Japanese and foreign-affiliated companies in the fields of scientific instruments, sensors, vacuum equipment, and chemical processing machinery, I passed the national Administrative Scrivener examination in 2020 and founded Tommy’s Legal Service Administrative Scrivener Office in April 2021.

My practice is specialized in immigration procedures—visa applications, extensions, changes of status, and online filings for both companies and individuals. I support employers and foreign nationals with fast, accurate, and stress-free application processes.
English guidance and bilingual documentation are also available.

Hobbies: Motorcycles (Honda CB1300SB), touring, tennis, golf

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