Japan Naturalization Guide: Requirements, Permanent Residency, and Process

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Naturalization offers far more benefits than permanent residency. On the other hand, the criteria for being granted naturalization are extensive and much stricter than those for permanent residency. Therefore, if you are aiming for naturalization, it is crucial to fully understand the necessary conditions and requirements.

The key points of this article are as follows:

✓What is Naturalization? It means acquiring Japanese citizenship and legally becoming a Japanese national. ✓The 7 Requirements for Naturalization: To naturalize, foreign nationals must satisfy seven legal criteria under the Nationality Act: ①Domicile (Residency) Requirement、②Ability (Age) Requirement、③Good Conduct Requirement、④Livelihood (Financial) Requirement、⑤Loss of Original Nationality Requirement、⑥Thought/Ideology Requirement、⑦Japanese Language Proficiency Requirement ✓The Continuous Residence Rule: The residency requirement demands “5 consecutive years of living in Japan.” Your application may be rejected if you leave the country for a single period of over 3 months, or if your total days outside Japan add up to 100–150 days or more in a single year. ✓Work Experience Requirements: You must hold a valid work visa and have a proven track record of full-time employment for the most recent 3 consecutive years (or 1 year if you have been a long-term resident in Japan for over 10 years). ✓What Constitutes “Good Conduct”? The government will inspect your payment history for public pensions, health insurance, and resident taxes over the past year, alongside your traffic violations and criminal record over the past 5 years. ✓Evaluating Financial Stability: The livelihood requirement evaluates whether your entire household has a stable, regular income to support yourselves. ✓What is “Simplified Naturalization”? Relaxed requirements apply to foreign nationals with close ties to Japanese citizens (such as spouses or children) or those who have been long-term residents in Japan for over 10 years. ✓Seek Professional Help: Because applying for naturalization is incredibly time-consuming and labor-intensive, working with a specialist provides peace of mind.

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By understanding the requirements for naturalization, you can determine whether you are eligible to apply. Be sure to review these conditions carefully before beginning your application process.

1. What is Naturalization in Japan? Differences from Permanent Residency

Naturalization means that a foreign national acquires Japanese citizenship. This signifies transitioning from being a foreign national to a Japanese citizen, which grants you full political rights (the right to vote) and social security benefits. Since you legally become a Japanese national, you no longer need to worry about visa renewal procedures, and you will never be subject to deportation.

On the other hand, Permanent Residency refers to a status that allows a foreign national to reside in Japan indefinitely while retaining the nationality of their home country. Because permanent residents are still foreign nationals, they do not need to renew their visa status, but they are still required to renew their Residence Card every 7 years.

2. The 7 Requirements for Ordinary Naturalization in Japan

The requirements for a foreign national to naturalize in Japan are stipulated in Article 5 of the Nationality Act. In addition to these statutory rules, practical application procedures also require the applicant to have a sufficient level of Japanese language proficiency. A typical foreign national who has no family ties to a Japanese citizen—such as someone who came to Japan on a work visa—must satisfy all seven of these conditions.

However, for foreign nationals who are spouses of Japanese citizens, or children born to a Japanese and a foreign parent, the criteria are relaxed under “Simplified Naturalization” as specified in Articles 6 through 8 of the Nationality Act (detailed later in this article). The specific requirements you must meet vary depending on your individual situation.

Let’s take a closer look below at the seven principle requirements practically required for Ordinary Naturalization.

Reference: Ministry of Justice, “Nationality Act”

2-1. Domicile (Residency) Requirement

The regulations regarding the domicile requirement are one of the most critical elements in applying for naturalization in Japan.

Foreign nationals wishing to naturalize are required to have maintained an address in Japan “consecutively” for the most recent five years leading up to the time of application. In this context, “5 consecutive years” means continuous residence in Japan without any interruption. Simply having accumulated a total of five or more years of stay in Japan is insufficient; this period must be unbroken and continuous.

Handling of “5 Consecutive Years” in the Case of Temporary Departures Overseas

Foreign nationals living in Japan long-term may occasionally leave the country temporarily, whether for vacations, visits to their home country, or overseas business trips. In these cases, temporary departures from Japan under the “5 consecutive years” domicile requirement are handled as follows:

Case of Short-Term Vacations or Business Trips Within the Past 5 Years

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Short-term overseas travel and business trips are generally permitted. However, if a single departure period exceeds 3 months, the continuity of that residency period will no longer be recognized.

If you have a long-term departure exceeding 3 months even once within the past 5 years, you will be deemed to have failed to meet the continuous domicile requirement. For example, if you live in Japan for 4 years, spend 1 year abroad, and then return to Japan, your continuous residency period for naturalization will be reset, and you will be required to accumulate another 5 years of residence from scratch.

Case of Multiple Overseas Trips or Business Trips Within a Single Year

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Even if each trip is short-term, frequent departures from Japan can be seen as breaking the continuity of your residency.

If your total number of days outside Japan exceeds 100 to 150 days within a single year, there is a strong possibility that you will not be recognized as having “consecutively” maintained an address in Japan. It is important to note that the specific number of allowed days can vary depending on how the Legal Affairs Bureau evaluates each individual case, and these criteria are subject to change.

Therefore, even if every single overseas trip lasts less than 3 months, making multiple trips that push your total time outside Japan past 100 to 150 days in a single year will result in failing to meet the domicile requirement. Extreme caution is highly recommended.

3-Year Work Period Required Within the “5 Consecutive Years”

In addition to the “5 consecutive years” residency requirement, you must have been employed and actively working for at least the most recent 3 consecutive years. This employment and tax-paying period cannot be fulfilled through part-time jobs (arubaito). You must hold a valid work visa (status of residence) and have a proven track record of full-time employment for the last 3 years. While working as a permanent, full-time employee (seishain) under a work visa is the standard baseline, contract employees (keiyaku shain) or temporary agency workers (haken shain) are also acceptable, provided you are working under a proper work visa. Changing jobs during this employment period is generally not considered an issue.

2-2. Ability (Age) Requirement — (Age Threshold Lowered Since April 2022)

The ability requirement demands that you are at least 18 years old and have also reached the age of majority under the laws of your home country. In other words, you must be legally recognized as an adult in both Japan and your home country.

In Japan, the legal age of majority was lowered from 20 to 18 on April 1, 2022, following a revision to the Civil Code. Along with this amendment, the age requirement for naturalization was also lowered to 18.

Case of a Minor Child Applying for Naturalization Together with Their Parents

If a minor child applies for naturalization together with their parents, it qualifies as “Simplified Naturalization” (detailed later), and the ability requirement is waived. For this reason, children under 18 years old can also apply for naturalization. However, please note that, as a general rule, a minor cannot apply for naturalization independently without their parents.

2-3. Good Conduct Requirement

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In the naturalization application process, whether your conduct is good and upright is also a key requirement.

Foreign nationals wishing to naturalize must demonstrate compliance with the good conduct requirement through their tax-paying history and adherence to laws and regulations within Japanese society. This assessment is conducted by evaluating your tax records, criminal history, and any presence of traffic violations.

Compliance Status of Public Pension, Health Insurance, Resident Tax, and National Taxes

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Your payment and compliance status for the public pension, health insurance, resident tax, and national taxes is also a crucial checkpoint. Payment records for the past year will be heavily scrutinized, and this review applies not just to the applicant themselves, but to every single member of the entire household. Even if there have been past payment delays, your application can still be accepted provided that you complete all outstanding payments before submitting the application. However, please note that these operational standards are subject to change, so ongoing caution is required.

Case of Business Owners and Sole Proprietors

For corporate business owners and sole proprietors, the payment and compliance status of the company or sole proprietorship will be verified in addition to their personal records. The authorities will also evaluate whether the business is operating at a loss, carrying an excessive amount of debt, or has any history of tax violations. Furthermore, the company’s enrollment status in the Employees’ Pension Insurance (Kosei Nenkin) will be checked; if the business has failed to enroll despite being legally required to do so, the naturalization application will not be approved.

If a business owner manages multiple companies, the financial and operational status of every single company must be submitted at the time of the naturalization application.

Traffic Violations

Regarding traffic violations, your driving record for the past 5 years will be thoroughly reviewed. If you have received a “red ticket” (a criminal traffic offense), you will be unable to apply for naturalization for 5 years from the date it was issued. On the other hand, if you only have minor traffic infractions where the penalty points remain around 2 points or less, you can still apply. However, if such minor violations occur frequently, or if you have unpaid fines associated with these violations, your application for naturalization will not be approved.

Criminal Record

Applicants for naturalization must prove that they have no history of breaking the law and no record of violating the Immigration Control Act.

Case of Having a Criminal Record

Even if you have a criminal record, the likelihood of being granted naturalization increases if more than 10 years have passed since you completed your sentence or penalty. The Nationality Act requires an applicant’s “conduct to be good and upright,” and this standard factors in the passage of time following the completion of a sentence. Under the Penal Code of Japan, the legal effect of a sentence lapses 10 years after a person completes a prison sentence (or receives an exemption from its execution), provided they have not received any further fines or harsher punishments during that time.

However, depending on the nature and severity of the crime, naturalization may still be denied even after 10 years have passed. Conversely, having a criminal record does not automatically mean a permanent ban; there is a possibility that naturalization will be approved if more than 10 years have elapsed.

The specific evaluation criteria for “good conduct” span a wide range of areas, including criminal records involving prison time, guilty verdicts with suspended sentences, violations of the Immigration Control Act (such as overstaying a visa), traffic violations, unpaid taxes, and torts under civil law. In practice, a common benchmark used by the authorities is the passage of a period equal to twice the duration of the suspended sentence. For example, if you received a 2-year suspended sentence, there is a possibility that naturalization may be granted once 4 or more years have passed since the sentencing date.

Ultimately, the final decision on whether to grant naturalization hinges on the motive and nature of the offense, as well as your behavior after the suspended sentence period ends. It is highly recommended that applicants reflect deeply on their past mistakes and express this remorse in their “Statement of Motive for Naturalization” (Kika no Dokisho) or a separate accompanying document to be attached to the application.

Case of Overstaying a Visa (Status of Residence)

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Even if you have overstayed a visa in the past, there is a possibility that naturalization will be granted if more than 10 years have passed since you received Special Permission to Stay (Zairyu Tokubetsu Kyoka). In this case, it is highly advisable to attach a document to your naturalization application that explains the circumstances leading up to the overstay and how you came to receive the special permission, while clearly demonstrating your deep reflection and remorse.

On the other hand, if the overstay lasted only for a very short period and you promptly and appropriately resolved the issue to obtain a regular status of residence, naturalization may potentially be approved without waiting the full 10 years. As shown here, the evaluation of a past immigration violation or criminal record in a naturalization application depends heavily on the specific nature of the case and the applicant’s subsequent efforts to rectify their situation.

2-4. Livelihood (Financial Stability) Requirement

The livelihood requirement in a naturalization application evaluates whether the applicant possesses the necessary financial foundation to maintain their daily life in Japan. The core focus of this screening is whether you have a stable and reliable source of income.

Focus on Having a Regular Income

While there is no fixed rule regarding the exact amount of income required, a monthly income of around 200,000 yen is generally considered the standard baseline needed to support a basic lifestyle.

Because the livelihood requirement is assessed on a household-by-household basis, you can still meet this condition even if you do not earn an income yourself, provided that your spouse or family members generate enough income to support the household. However, this 200,000 yen figure is merely a rough guideline; actual living expenses vary depending on your family structure and lifestyle. For instance, if you have dependents, the required annual income will naturally increase to reflect those additional costs.

Not Judged Solely by Homeownership or Savings

Whether you own your home or rent it does not affect this evaluation. Furthermore, regarding the amount of your savings, even if the balance is low, it will not pose a problem for your naturalization application as long as you have a stable income sufficient to maintain your life in Japan. Practices such as depositing a large lump sum of money into your bank account immediately before applying have no positive impact on the screening; in fact, they can arouse suspicion and should be avoided.

The crucial point is to demonstrate that the applicant or their family can maintain a stable and continuous lifestyle through the income they currently earn. While the livelihood screening for naturalization is not quite as strict as the financial requirements for a Permanent Residency application, you are still required to prove the economic capacity to sustain an independent life in Japan.

2-5. Prevention of Dual Nationality (Loss of Nationality) Requirement

Japan’s Nationality Act contains provisions requiring applicants to divest themselves of their foreign citizenship upon naturalization. Article 5 of the Nationality Act explicitly states as a requirement: “5. He or she has no nationality, or the acquisition of Japanese nationality will result in the loss of his or her nationality.” This is what is commonly referred to as the “Loss of Nationality Requirement.”

When applying for naturalization, the applicant must either be stateless or demonstrate a willingness to renounce their current nationality through the naturalization process. Because Japan does not permit dual nationality, a naturalization applicant must ensure they do not hold any other citizenship at the same time they acquire Japanese nationality.

Since you are required to renounce your home country’s nationality, if you are unable to do so due to factors such as unfulfilled military service obligations or tax delinquencies in your home country, you must first complete your military service or clear your tax arrears before applying for naturalization. On the other hand, if an applicant is in a special situation where it is impossible to renounce their current nationality by their own will—such as citizens of Iran, or minors from Brazil—naturalization may still be approved if they can prove their inability to divest themselves of their nationality at the time of application.

Before applying for naturalization, it is highly recommended to verify whether your current circumstances allow you to successfully renounce your home country’s nationality.

2-6.Constitutional (Ideological) Requirement

In naturalization applications, there is a “constitutional (ideological) requirement” to prove that the applicant has no intention of overthrowing the structure of the Japanese government by force. The screening examines not only the naturalization applicant but also whether their family members or close associates have been involved in anti-social activities. Under the provisions of the Nationality Act, naturalization will not be granted to anyone who has attempted or advocated the destruction of the Constitution or the government through violence.

Article 5 of the Nationality Act explicitly sets forth the following condition for naturalization: “Since the enforcement of the Constitution of Japan, he or she has never plotted or advocated the destruction of the Constitution of Japan or the government established thereunder by force, nor formed or belonged to a political party or other organization which plots or advocates the same.” This statutory clause covers ensuring that the applicant has not joined anti-social forces, terrorist organizations, or groups with extreme political ideologies.

At the time of application, applicants are required to submit an oath promising to comply with the Constitution and laws and to behave as a good upstanding citizen. Furthermore, the applicant’s compliance with this constitutional requirement is verified through character investigations and background checks conducted by the Legal Affairs Bureau with the police.

If an applicant has been a member of a group associated with organized crime (the Yakuza) or terrorism, naturalization will not be approved. Involvement in specific political organizations or social movements can also have a major impact on the application. While it may become possible to apply for naturalization after a certain period has passed since leaving such an organization, the required timeframe depends on a comprehensive evaluation by the Legal Affairs Bureau.

If family members or relatives participate in anti-social forces or specific political organizations, it can influence the naturalization screening depending on the nature of the relationship and the degree of involvement with the group. If a relative holds a high-ranking position within such an organization, the timeline leading up to the approval of the naturalization application tends to become longer.

If this information is concealed in the application documents or during interviews and is later discovered during the screening process, it will be deemed a fraudulent application, significantly increasing the risk of denial. Therefore, it is crucial to provide information with complete honesty and transparency when applying for naturalization.

2-7. Japanese Language Proficiency Requirement

When applying for naturalization, the applicant is required to possess a foundational ability to read and write Japanese, as well as the capacity to understand and use everyday conversation. Specifically, a Japanese language proficiency equivalent to at least a 3rd-grade elementary school student, or an N3 level on the Japanese Language Proficiency Test (JLPT), is required.

The assessment for this requirement takes place throughout the entire application process, including during consultations at the Legal Affairs Bureau, the submission of application documents, interactions during interviews, and the filling out of application forms by the applicant’s own hand.

In order to properly exercise the duties and rights of a Japanese citizen, communication in Japanese is indispensable. For example, when exercising the right to vote, an individual cannot accurately convey their intentions unless they can read and write the candidates’ names. For this reason, Japanese reading and writing literacy is considered a fundamental and essential skill for living in Japan.

The Legal Affairs Bureau evaluates the applicant’s Japanese proficiency through various methods during the application process. During the initial consultation, if the applicant attends the meeting alone, their proficiency is judged based on oral interactions in Japanese. Furthermore, application documents are required to be handwritten by the applicant, which serves as an evaluation of their written language skills. In addition, the submission of documents such as the Statement of Motive for Naturalization and the Oath allows for a comprehensive assessment of the applicant’s Japanese language ability.

In particular, during the official screening interview, the applicant’s communication skills in Japanese are thoroughly tested, encompassing not only basic reading and writing skills but also everyday conversational ability. In some cases, a written Japanese test may also be administered during the interview.

3. Conditions for Simplified Naturalization (Relaxed Requirements for Japan Naturalization)

Simplified naturalization (Kani Kika) is a system that allows foreign nationals who meet specific conditions to undergo the naturalization screening under relaxed criteria compared to standard requirements. This system applies to foreign nationals who are married to a Japanese citizen, children of Japanese citizens, children born and raised in Japan, or foreign nationals who have resided in Japan for an extended period. By qualifying for simplified naturalization, some of the standard requirements—such as the residency, capacity, or livelihood requirements—are relaxed or waived; however, the Japanese language proficiency requirement remains strictly mandatory.

3-1. Spouses of Japanese Citizens

For foreign nationals married to a Japanese citizen, the residency requirement is relaxed as follows:

• Married for less than 3 years: The residency requirement is reduced from 5 years to 3 years.
• Married for 3 years or more: The residency requirement is reduced from 5 years to 1 year.

Additionally, the capacity requirement is also relaxed, making it legally possible for minors to apply for naturalization (though cases where the spouse is a minor are extremely rare).

3-2. Children of Japanese Citizens or Children Born in Japan

For individuals who fall under the categories listed below—such as children of parents who naturalized and became Japanese citizens, or former Japanese citizens who renounced their Japanese nationality—the residency, capacity (minors are eligible), and livelihood requirements are relaxed.

• Biological children of Japanese citizens (excluding adopted children): The 5-year residency requirement is waived (no restriction).
• Adopted children of Japanese citizens, who were minors under their home country’s law at the time of adoption: The residency requirement is reduced from 5 years to 1 year.
• Former Japanese citizens who renounced their Japanese nationality (excluding those who lost it after previously naturalizing): The 5-year residency requirement is waived (no restriction).
• Children born in Japan who have been stateless since birth: The residency requirement is reduced from 5 years to 3 years.

For children who fall under the categories below, only the residency requirement is relaxed:

• Children of former Japanese citizens (excluding adopted children): The residency requirement is reduced from 5 years to 3 years.
• Children born in Japan: The residency requirement is reduced from 5 years to 3 years.

3-3. Long-Term Residents

For foreign nationals who have resided in Japan for 10 years or more, as a relaxation of the residency requirement, the required period of employment is shortened from 3 years or more to 1 year or more.

In simplified naturalization, the volume of documents to be submitted at the time of application is not reduced; however, because requirements such as residency and livelihood are relaxed, the overall hurdle to naturalization becomes lower than that of standard naturalization.

4. Conditions for Exceptional Naturalization (Great Naturalization)

Exceptional naturalization (Dai-Kika) is a special naturalization procedure granted to foreign nationals who have achieved extraordinarily meritorious deeds.

Through this procedure, it becomes possible to acquire Japanese nationality even if the applicant does not clear the seven standard criteria required for regular naturalization applications. The process for exceptional naturalization moves forward by obtaining the consent of the National Diet, after which the Minister of Justice grants the final approval. However, as of 2024, there are no recorded instances where this procedure has actually been applied.

5. Step-by-Step Procedure for Japan Naturalization Application

The location for processing a naturalization application is the Legal Affairs Bureau or District Legal Affairs Bureau that holds jurisdiction over the area where the applicant resides. First, you must book a consultation appointment with the Legal Affairs Bureau. After speaking with an official, if there is a realistic prospect that you meet the criteria, you will be guided through the required documents.

Among the necessary documents, some must be ordered from your home country while others can be gathered within Japan, and there are also application forms that you must fill out yourself. In addition, an in-person interview will be conducted, and it is not uncommon for officials to visit or make phone confirmations to your home, neighborhood, or workplace.

As you can see, applying for naturalization requires a significant amount of time, effort, and patience. Furthermore, since any deficiencies or missing documents can lead to a denial, you must ensure that all accurate paperwork is thoroughly prepared. For this reason, hiring a professional (such as an administrative scrivener) can help the procedure progress smoothly. If you have any anxieties, it is highly recommended to consider this option.

Reference: Ministry of Justice, “Application for Naturalization Permission”

6. Summary

In this article, we introduced the conditions to be met and the procedure for foreign nationals to naturalize in Japan. The following is a breakdown of the key points:

✓What is Naturalization? It means acquiring Japanese citizenship and legally becoming a Japanese national. ✓The 7 Requirements for Naturalization: To naturalize, foreign nationals must satisfy seven legal criteria under the Nationality Act: ①Domicile (Residency) Requirement、②Ability (Age) Requirement、③Good Conduct Requirement、④Livelihood (Financial) Requirement、⑤Loss of Original Nationality Requirement、⑥Thought/Ideology Requirement、⑦Japanese Language Proficiency Requirement ✓The Continuous Residence Rule: The residency requirement demands “5 consecutive years of living in Japan.” Your application may be rejected if you leave the country for a single period of over 3 months, or if your total days outside Japan add up to 100–150 days or more in a single year. ✓Work Experience Requirements: You must hold a valid work visa and have a proven track record of full-time employment for the most recent 3 consecutive years (or 1 year if you have been a long-term resident in Japan for over 10 years). ✓What Constitutes “Good Conduct”? The government will inspect your payment history for public pensions, health insurance, and resident taxes over the past year, alongside your traffic violations and criminal record over the past 5 years. ✓Evaluating Financial Stability: The livelihood requirement evaluates whether your entire household has a stable, regular income to support yourselves. ✓What is “Simplified Naturalization”? Relaxed requirements apply to foreign nationals with close ties to Japanese citizens (such as spouses or children) or those who have been long-term residents in Japan for over 10 years. ✓Seek Professional Help: Because applying for naturalization is incredibly time-consuming and labor-intensive, working with a specialist provides peace of mind.

Although there are many requirements to meet, naturalizing in Japan grants you more rights and eliminates the need for any residence-related procedures. If you are a foreign national who wishes to continue living in Japan in the future, it is highly recommended to consider naturalization as a viable path forward.

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