Dual Nationality Choice Deadline
The dual nationality choice deadline is the point at which a Japanese citizen who also holds a foreign nationality is legally required to select one of the two, under Article 14 of the 国籍法 (Kokusekihō, "Nationality Act").12 Missing it does not strip nationality automatically, but it opens the door to a formal government demand, and confusion over the correct age threshold is the single most common mistake families make with this rule.
Procedures, fees, and requirements can change. Confirm current details at the Ministry of Justice site. This article is general information, not legal, tax, or immigration advice; for a complex case, consult a licensed immigration lawyer or gyoseishoshi (administrative scrivener, 行政書士).
Overview
A "dual national" (重国籍者) is a Japanese citizen who simultaneously holds a foreign nationality. Japanese nationality law does not generally permit indefinite retention of a second nationality by choice, and Article 14 requires this group to pick one.12
The same underlying policy shows up elsewhere in nationality law: naturalization law separately requires most new Japanese citizens to give up their other nationalities as a condition of naturalizing.13 The choice deadline applies that same logic to people who already hold dual nationality through means other than their own voluntary choice; the next section explains that distinction precisely.
| Term | Reading | Meaning |
|---|---|---|
| 重国籍 | jūkokuseki | Dual nationality, holding two nationalities at the same time |
| 国籍選択 | kokuseki sentaku | Choice of nationality, the Article 14 procedure this article covers |
| 催告 | saikoku | The Minister of Justice's formal demand to choose, issued under Article 15 |
Who Must Choose
The population subject to the Article 14 choice deadline is people who currently hold both Japanese nationality and a foreign nationality at the same time.14 This is legally distinct from Article 11, Paragraph 1 of the Nationality Act, which covers a Japanese citizen who acquires a foreign nationality "at their own choice" (自己の志望によって).
Under Article 11, Japanese nationality is lost automatically and immediately, with no deadline and no choice involved.2 An adult who voluntarily naturalizes in another country therefore normally falls under Article 11, not under the Article 14 choice deadline that is this article's subject. The Article 14 deadline instead applies to people who came to hold dual nationality by means other than their own deliberate act of choosing a foreign nationality, most commonly by birth.2
Dual nationality from birth vs. dual nationality acquired later
A child who is dual national from birth, and how that status is registered, is covered in this pillar's companion article on citizenship for children born in Japan.5 This article picks up from that point, once a person already holds dual nationality and needs to know when and how to choose.
"Acquired later" dual nationality, for purposes of the Article 14 deadline, means a person who came to hold a second nationality after birth through a means that did not constitute their own voluntary choice under Article 11. An example is an automatic grant of foreign nationality triggered by a parent's status change or a change in family circumstances, not by the person's own application.2 A person's own voluntary naturalization abroad as an adult is a separate legal event under Article 11 and is not the subject of the age-based deadline described below.2
The Choice Deadline: Age 20, and the Age-22 Exception
The current statutory threshold is age 20 for most dual nationals, but an older age-22 figure still circulates widely online and in outdated guidance. The two sections below separate the standing rule from the closed transitional exception that produced the confusion.
The standing rule since the April 1, 2022 amendment
Article 14, Paragraph 1 currently reads, in the Ministry of Justice's bilingual text: a Japanese citizen with a foreign nationality must select one of the two before turning 20 if dual nationality arose before they turned 18, or within two years of that time if it arose at or after 18.142
In plain terms: if dual nationality arose before the person turned 18, the deadline is age 20. If it arose at or after 18, the deadline is two years from the date dual nationality arose.142
The following diagram summarizes how the deadline is set.
This wording is the product of a 2022 amendment to the Nationality Act, effective April 1, 2022, enacted alongside the Civil Code amendment that lowered the general age of adulthood from 20 to 18. Before that date, the same provision used the thresholds 20 and 22, not 18 and 20.4
Why age 22 still appears everywhere: the transitional provision
Age 22 is not part of the current standing rule in Article 14. It survives only inside a one-time transitional provision tied to the amendment's April 1, 2022 effective date, so that the shortened thresholds did not retroactively shorten deadlines already in progress under the old rule.4
Practitioner sources describe the transitional cohorts as follows: dual nationals already 20 or older on April 1, 2022 kept the old "choose by 22" deadline, while those 18 or 19 on that date had until March 31, 2024 (as of the 2022 to 2024 transitional window, now closed; confirm current figures with the Ministry of Justice). This transitional detail could not be confirmed against the amendment's official supplementary provisions text directly; it rests on two independent practitioner sources that agree with each other and with the Ministry of Justice's stated non-retroactivity policy.67
Because age 22 was widely reported around the time of the 2022 amendment, older blog posts and forum threads written before or shortly after that date still repeat it as if it were the current rule. Any source stating "22" as today's standing deadline for a child dual national from birth should be treated as outdated unless it is explicitly describing this now-closed transitional cohort.4
How to Choose: Declaration or Renunciation
A dual national facing the deadline has two paths: declare a choice of Japanese nationality, or renounce the foreign nationality first. The diagram below outlines both.
Filing the declaration to choose Japanese nationality
A declarant files the 国籍選択届 (kokuseki sentaku todoke, "declaration of choice of nationality") at a municipal office if living in Japan, or at a Japanese embassy or consulate if living abroad.8 A declarant aged 15 or older files in person; a legal guardian files on behalf of a declarant under 15.28
No supporting documents are generally required. The one stated exception is a certified copy of the family register (戸籍謄本, koseki tōhon), which must be attached when filing at an overseas embassy or consulate if the declarant's family register has not yet been digitized (as of the Ministry of Justice's current procedural page; confirm current figures with the Ministry of Justice).8
| Item | Amount | As of | Notes |
|---|---|---|---|
| Filing the 国籍選択届 | No fee | Current MOJ procedural page, undated revision | Legal basis: Nationality Act Article 14, Paragraph 2, and Family Register Act Article 104-28 |
There is no fee for filing the declaration (as of the same procedural page).8
By filing the declaration, the declarant states that they select Japanese nationality and will renounce the foreign nationality. Whether the foreign nationality is actually and automatically lost through this declaration depends entirely on the foreign country's own legal system, not on the Japanese declaration itself.149
For declarants whose foreign nationality is not automatically extinguished by the Japanese declaration, Article 16, Paragraph 1 imposes a duty to "try to renounce" that foreign nationality afterward. This is an effort obligation, not an absolute requirement to produce proof that it happened.2
Renouncing the foreign nationality instead
A person may instead formally renounce the foreign nationality under that country's own law first, then notify Japanese authorities once the foreign process is complete, so the family register reflects the change. The Japan-side filing for this is a notification of loss of foreign nationality.47 The research available for this article did not confirm a specific day-count deadline for that Japan-side notification step, so no timeframe is stated here; a reader should confirm the current notification window with a municipal office or the nearest embassy or consulate.
The process, cost, and difficulty of renouncing a foreign nationality is governed entirely by that country's own law and administrative practice, not by Japan's. Some countries make renunciation straightforward; others make it slow, costly, or in some cases practically unavailable. This article does not generalize a single country's process; confirm the specific requirements with that country's own embassy, consulate, or legal counsel.410
A Japanese gyoseishoshi cannot act as an agent for the foreign-country side of a renunciation process, since that side is a matter of foreign sovereignty. The Japan-side filings and the foreign-country-side renunciation proceed in parallel and are handled separately.7
Japan's own rules are structured to avoid creating statelessness on the Japan side: a person is not permitted to formally renounce Japanese nationality (国籍離脱, kokuseki ridatsu) unless they already hold, or can demonstrate they hold, a foreign nationality.10
What Happens If You Miss the Deadline
Missing the Article 14 deadline does not, by itself, strip Japanese nationality. It opens a separate legal mechanism, described below, and a documented pattern of how that mechanism is actually used in practice.
The Minister of Justice's formal demand (催告)
Article 15 of the Nationality Act authorizes the Minister of Justice to issue a written demand (催告, saikoku) requiring a dual national to select a nationality, once the Article 14 deadline passes without a choice being made. If direct notice to the person is not possible, the demand may instead be published in the Official Gazette (官報).2
If the person does not select a nationality within one month of receiving the demand, or within one month of Official Gazette publication if that was the method used, that person loses Japanese nationality at the end of that one-month period as a general rule, subject to an exception for circumstances beyond the person's control.42
This demand-and-one-month mechanism is written directly into the statute; it is fixed in the law itself, separate from any administrative decision about whether or how often to actually use it.42
The documented enforcement gap
The Ministry of Justice has stated it has no reliable, comprehensive way of identifying which Japanese citizens currently hold a second nationality, since dual nationality is not something the government proactively tracks. Japan Times reporting quoted a Justice Ministry official stating, "We actually cannot be sure about who has multiple nationalities" (as of 2023; confirm current figures with the Ministry of Justice).11
The same reporting states the Ministry has never exercised its Article 15 demand power against a dual national and has described comprehensively tracking dual nationals as a "bureaucratic nightmare" (as of 2023). No documented case of nationality revocation for failing to choose appeared in that reporting.11
The Ministry of Justice has stated that roughly 890,000 people have held or currently hold dual nationality since a tracking period beginning in 1985 (as of 2023).11 A related Japan Times reader survey found that 76.8% of dual-national respondents maintain both citizenships in practice, though that figure comes from a self-selected survey rather than a government-verified statistic.11
Good to know
The gray zone many dual nationals actually live in
Declaring to choose Japanese nationality while quietly retaining and continuing to use the foreign passport, for foreign travel for instance, is a commonly described practice among Japanese dual nationals (as of 2023; confirm current figures with the Ministry of Justice).11 It carries no explicit statutory penalty tied to merely possessing the foreign passport, but it does not resolve the underlying Article 16 duty to endeavor to renounce, and reporting describes government tolerance of the practice as an unstated administrative posture rather than a formal legal safe harbor.11
The practical risk of retaining a foreign passport differs depending on which foreign nationality is involved, since it turns on that country's own recognition, or non-recognition, of the Japanese choice declaration. This article does not generalize a single country's outcome.410
Statelessness risk when renouncing the foreign side
Statelessness exposes a person to serious practical harm: difficulty obtaining travel documents or lawfully entering or residing in a country, barriers to education, healthcare, and employment, and vulnerability to arbitrary treatment.12
On the Japan side, the law is structured to prevent Japan from creating statelessness directly, since formal renunciation of Japanese nationality is only permitted for a person who already holds, or can demonstrate, a foreign nationality.10
The realistic statelessness risk in this topic sits mainly on the foreign-country side of the process. Because renunciation procedures, effective dates, and any attached conditions are governed entirely by that country's own law, a person who mistimes the sequence of steps, or whose foreign renunciation later turns out to be incomplete or reversible under that country's law, can end up in an unresolved or precarious nationality status. This is the scenario professional guidance most consistently points to as warranting review by a licensed immigration lawyer or gyoseishoshi before acting.1012
Active litigation and reform watch
There is real, ongoing litigation over Japan's dual-nationality restrictions, but it concerns Article 11, the automatic and immediate loss of Japanese nationality when a citizen voluntarily acquires a foreign nationality, not the Article 14 choice deadline that is this article's subject. The two provisions are legally distinct and this article does not conflate them.2
Japanese courts have repeatedly rejected constitutional challenges to Japan's dual-nationality restrictions at multiple levels: a Fukuoka district-level ruling upheld the ban as constitutional in a decision reported December 2023, the Fukuoka High Court upheld it on appeal in a decision reported October 2024, a Tokyo court separately upheld the ban in a case involving a teenage plaintiff reported the same month, and reporting indicates Japan's Supreme Court rejected a related constitutional challenge in a decision reported May 2025 (as of May 2025).13141516
No primary government or legislative source confirms a pending bill or enacted amendment that would change Japan's dual-nationality policy. Advocacy for reform is documented, but this article does not assert that legislative change is imminent, given the absence of a primary source confirming one (as of 2026).11
How this interacts with naturalization
Naturalization (帰化, kika) is a separate legal track. Under Nationality Act Article 5, Paragraph 1, Item 5, an applicant for naturalization must generally be stateless or must lose their previous nationality as a result of naturalizing into Japan, as one of the naturalization conditions.3
An exception exists under Article 5, Paragraph 2: if the applicant cannot renounce their original nationality by their own will, because their home country's law does not permit voluntary renunciation, naturalization may still be approved despite not meeting that condition.3
This is conceptually related to, but legally separate from, the Article 14 choice deadline covered in this article. Naturalization is a foreign national's route into Japanese nationality, while the choice deadline governs someone who already holds Japanese nationality alongside a foreign one.3
See also
- Citizenship for Children Born in Japan
- Koseki: Japan's Family Register Explained
- Marriage to a Japanese National