Naturalization Requirements Clearly Explained [April 2026 Update — Licensed Immigration Specialist]
A licensed immigration specialist explains the seven conditions required for a naturalization application (acquisition of Japanese nationality) and the April 2026 operational changes — including the practical 10-year residence requirement and expanded 5-year tax verification period. Also covers the relaxed conditions for simplified naturalization and the difference from permanent residence.
Applying for naturalization (acquisition of Japanese nationality) requires satisfying the conditions set out in the Nationality Act. From April 1, 2026, the review process was revised — the residence requirement was raised in practice to 10 or more years, and the tax verification period was expanded to 5 years. This article provides a clear overview of the full picture.
What Is a Naturalization Application?
Naturalization is a system under which the Minister of Justice grants Japanese nationality to a foreign national who has expressed the desire to acquire it (Nationality Act Article 4). When naturalization is approved, a public notice is issued in the Official Gazette, and the person acquires Japanese nationality from that date.
The key difference between naturalization and permanent residence is that naturalization means "acquiring Japanese nationality and becoming Japanese," while permanent residence means "obtaining the right to continue living in Japan while retaining foreign nationality." After naturalization, there is no longer any need to renew a status of residence — but as a general rule, the person will lose their home country's nationality.
The Seven Conditions for Naturalization
Combining the conditions set out in Nationality Act Article 5 with those established through practice, there are seven conditions in total.
① Residence Condition (Address Requirement)
The Nationality Act requires that the applicant have had a continuous address in Japan for at least 5 years as of the time of application. However, as explained below, the April 2026 operational change means that in practice, a residence track record of 10 or more years is now emphasized.
"Continuous" is the key word — continuity is required. Brief overseas travel and short business trips are not a problem, but being outside Japan for extended periods of a year or more, or spending more than half of each year abroad, can break this continuity.
Additionally, periods spent in Japan on a Student visa status are generally not counted toward the residence period requirement.
② Capacity Condition
The applicant must be at least 18 years of age and must have reached the age of majority under the laws of their home country.
③ Good Conduct Condition
The applicant must have a good conduct record. A comprehensive assessment is made of their criminal history (if any), the nature of any offenses, their tax payment history, and whether they have caused any disruption to society.
④ Financial Independence Condition
The applicant must be able to support themselves financially through their own assets or skills, or through the assets or skills of a spouse or family member with whom they share a household. Even if the applicant does not work, the requirement is met as long as the family's income sustains their daily life.
As a general benchmark, a household income of around 3 million yen per year is frequently referenced for a household with one to two dependents, though the specific judgment varies by region and household composition.
⑤ Prevention of Dual Nationality Condition
The applicant is required to relinquish their current nationality upon naturalization. Japan does not in principle recognize dual nationality. In some countries, the process of renouncing nationality can be complex or time-consuming, so it is important to investigate this in advance.
⑥ Constitutional Compliance Condition
The applicant must comply with the Constitution of Japan and must not belong to any organization that engages in violent acts contrary to the Constitution.
⑦ Japanese Language Proficiency Condition (Not Explicitly Stated in the Nationality Act, But Required in Practice)
The applicant must have a sufficient level of Japanese language ability — conversation and reading / writing — to function in everyday life without difficulty. A common practical benchmark is approximately the level of a third-grade elementary school student in Japan. This is verified through an interview at the Legal Affairs Bureau.
Important Operational Changes From April 2026
On March 27, 2026, the Ministry of Justice announced that a new set of review standards would apply to approval decisions made from April 1, 2026 onward.
Change ①: Practical Raising of the Residence Requirement
The text of the Nationality Act (5 years or more) has not changed, but the review process has been revised to place greater emphasis on a residence track record of 10 years or more. The purpose is to align the naturalization residence requirement with that of permanent residence permission (generally 10 or more years in principle).
Change ②: Expansion of the Tax Verification Period
Previously, applicants were required to submit tax payment certificates for the most recent 1 year. From April 1, 2026, the review process has been revised to verify 5 years of tax payment history.
The social insurance premium verification period has also been expanded to 2 years.
Simplified Naturalization: Cases Where Requirements Are Relaxed
For people who have a special relationship with Japan, the residence requirement and other conditions are relaxed under Nationality Act Articles 6–8 (simplified naturalization).
Main Cases of Simplified Naturalization
| Eligible Person | Relaxation |
|---|---|
| Spouse of a Japanese national (married 3+ years; residing in Japan 1+ year) | Residence requirement is shortened |
| Spouse of a Japanese national (married 3+ years; residing overseas) | Address requirement may be waived in some cases |
| Natural child of a Japanese national, residing in Japan | No restriction on length of residence |
| Former Japanese national (once held Japanese nationality) | Address requirement reduced to simply residing in Japan |
| Special Permanent Resident | Residence requirement, capacity condition, etc. are relaxed |
The Naturalization Application Process
- Make an appointment for an advance consultation at the Legal Affairs Bureau (Nationality Section)
- Meet with the counselor and receive a list of required documents
- Gather documents (Japanese side, home country side, and translations)
- Submit documents to the Legal Affairs Bureau; await acceptance
- Legal Affairs Bureau review (may include an interview with the officer-in-charge and possible home visit)
- If approved: public notice in the Official Gazette → new family register created → various follow-up procedures
- If rejected: confirm the reason → consider reapplication
The review period from application to approval typically takes 1 to 2 years.
Frequently Asked Questions
Q. I have lived in Japan for 5 years. With the April 2026 change, can I no longer apply for naturalization?
A. The text of the Nationality Act has not changed, so 5 or more years of residence still satisfies the legal address requirement. However, the post-April 2026 review process has shifted to placing greater weight on a residence track record of 10 or more years, meaning that approval may become more difficult with 5 to 9 years of residence. For your specific situation, we recommend consulting the Legal Affairs Bureau or a specialist.
Q. Does the period spent as a student on a Student visa count toward the residence years?
A. Periods spent in Japan on a Student visa status are generally not treated as residence for the purpose of work or living, and may not be counted toward the residence years. The common practice is to switch to a work visa or spousal visa after completing studies and then apply after a certain amount of time has passed.
Q. How much does a naturalization application cost?
A. There is no application fee for the Legal Affairs Bureau. However, out-of-pocket costs will arise for obtaining documents (such as a residence certificate and tax certificate), translation fees for home country documents (approximately 10,000 to 50,000 yen depending on language and volume), and transportation costs. A separate fee is charged if you engage a licensed immigration specialist.
Q. I don't want to lose my home country's nationality after naturalization. What can I do?
A. Japan does not in principle recognize dual nationality, and applicants are expected to express an intent to relinquish their home nationality upon approval of naturalization. In some countries, the legal system makes renunciation of nationality difficult or impossible. Japan's position is to require applicants to make a good-faith effort to renounce, and cases where renunciation is genuinely not possible are assessed individually.
Summary
Naturalization requires satisfying seven conditions under the Nationality Act: residence, capacity, good conduct, financial independence, prevention of dual nationality, constitutional compliance, and Japanese language proficiency. The April 2026 operational change means that the residence requirement is now practically weighted at 10 or more years, and the tax verification period has been expanded to 5 years.
The previous assumption that "you can apply after living here for 5 years" no longer holds in many cases. If you are considering naturalization, we recommend organizing your current situation early and beginning preparations for an application.
This article is based on the Nationality Act, official information from the Ministry of Justice, and the Ministry of Justice's March 27, 2026 announcement of the review of operational standards. Review standards vary depending on individual circumstances. Always verify the latest information with the Legal Affairs Bureau or on the Ministry of Justice's official website.
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