Japan has raised the minimum residency requirement for naturalization from 5 to 10 consecutive years, effective April 1, 2026. The Ministry of Justice confirmed the change on March 27, 2026, with the new requirements taking effect just four days later. All pending applications not yet decided as of April 1 are assessed under the new standard.
The revision is the most significant tightening of naturalization criteria in decades. It directly affects anyone who had been planning a long-term settlement path in Japan under the assumption that the 5-year citizenship window remained available.
What Changed: Japan’s New Naturalization Requirements from April 2026
The April 2026 revision changed three specific requirements.
Residency threshold: Minimum continuous residency increased from 5 years to 10 consecutive years.
Tax record verification: The period over which tax payment certificates are reviewed extended from 1 year to 5 years.
Social insurance verification: The period over which social insurance premium records are reviewed extended from 1 year to 2 years.
These changes apply to all general-track naturalization applicants. For applicants filing in 2026, the practical scope of the expanded review windows means that tax compliance from 2021 onward is now reviewable, and social insurance records from 2024 onward. Tax payment certificates in Japan — formally referred to as nōzei shōmeisho — are obtainable from your local municipal office.
Why This Change Did Not Go Through the Diet
The most significant legal dimension of this reform is how it was implemented. Japan’s Nationality Act (Article 5) still lists 5 years as the statutory minimum residency period for naturalization. The Nationality Act has not been amended.
Instead, the Ministry of Justice used its existing administrative discretion — the Justice Minister’s broad authority over naturalization decisions — to raise the practical standard through an operational policy adjustment, without parliamentary legislation or a Diet vote.
The government’s position is that the 5-year figure in the Nationality Act represents a floor, not a mandate, and that requiring more falls within the minister’s lawful authority. Legal scholars appear to be divided on this reading. According to legal commentary published following the announcement, critics argue that applying a de facto requirement that doubles the statutory figure — through administrative guidance rather than legislation — raises concerns about bypassing parliamentary process on immigration matters.
The policy forms part of Japan’s “Comprehensive Foreign Policy Measures” finalised in January 2026. The political process leading to it began in September 2025, when the Japan Innovation Party formally proposed raising naturalization criteria to match permanent residency standards. Prime Minister Sanae Takaichi instructed Justice Minister Hiroshi Hiraguchi in November 2025 to review and tighten the rules.
Why Japan Changed Its Naturalization Rules
The stated rationale from the Ministry of Justice is direct: for years, obtaining Japanese citizenship had a lower residency bar than obtaining permanent residency. Permanent residency requires a minimum of 10 years of continuous residence. Naturalization — which grants full citizenship including a Japanese passport and voting rights — previously required only 5. The ministry described this asymmetry as illogical, given that citizenship carries more rights and fewer restrictions than permanent residency.
The April 2026 reform brings the two tracks into alignment on the residency threshold.
Reduced-Residency Exceptions That Remain Unchanged
The revision applies to the general naturalization track. Reduced-residency pathways for specific circumstances remain in place:
- Spouse of a Japanese national: 3 years of marriage plus 1 year of residence in Japan, or 3 years of continuous residence if married for at least 3 years
- Born in Japan: 3 years of continuous residence
- Special permanent residents: 3-year pathway remains unchanged
One point worth noting for readers holding or approaching permanent residency: the dual citizenship position did not change in this revision. Japan’s Nationality Act continues to require renunciation of existing nationality upon naturalisation. The enforcement reality around this requirement — including the position of nationals from countries where formal renunciation is procedurally difficult — was not addressed in the April 2026 reform and remains unchanged.
The expanded tax and social insurance verification requirements now apply across all tracks, including the reduced-residency pathways above.
What This Means If You Are Already in Japan
For foreign residents who were 5–9 years into their Japan residency and had structured a long-term plan around the 5-year citizenship window, the practical implications are significant.
The timeline for general-track naturalization has doubled. Anyone who was 7 years into their residency and expecting to be eligible in 2 years now faces a further 3-year wait. People who chose to pursue naturalization rather than permanent residency specifically to avoid the 10-year PR requirement now find that the timelines are equal — making permanent residency a more logical intermediate step for many, since it does not require renouncing existing citizenship.
Freelancers and sole proprietors face a particular consideration under the expanded review window. The 5-year tax record review puts self-employed applicants under greater scrutiny than was previously the case: any gap in tax filings or health insurance payments between 2021 and 2026 is now reviewable. Addressing such gaps proactively — before submitting an application — is advisable.
Based on commentary from immigration practitioners reviewing the new guidelines, the standard applied appears to be strict: even a single late payment may be flagged during review.
How Japan Compares to Other Countries on Citizenship Timelines
In 2025, a total of 14,103 people applied for Japanese naturalization, of whom 9,258 were approved and 666 rejected. The change takes effect in a context where Japan already maintained one of the more restrictive immigration environments among developed economies. For comparison: the United States requires 5 years of permanent residency before citizenship eligibility; Germany recently reduced its requirement from 8 years to 5; France requires 5 years; Ireland requires 5 out of 9 years. Japan’s new 10-year standard now exceeds all of these — compounded by Japan’s no-dual-citizenship requirement, which has no equivalent among the countries listed above.
Zagdim Analysis
Who is most affected among Zagdim readers
This change most directly affects readers in one of three situations: people currently in Japan at years 5–9 of residency who had structured their long-term plans around the old citizenship timeline; people outside Japan who had included Japan on a shortlist partly because of the 5-year citizenship path; and people weighing Japan against other destinations for retirement, family relocation, or long-term lifestyle transition. For this group, the reform materially changes one of the assumptions that had made Japan look distinctive among developed countries: the ability to reach citizenship before the 10-year mark.
How the consideration set changes
Japan does not recognise dual citizenship — naturalising requires renouncing existing nationality. With the residency requirement now at 10 years and the renunciation requirement unchanged, the commitment required to become a Japanese citizen is among the highest of any country that many Zagdim readers might consider. That does not make Japan unsuitable — but it does change the calculus for users for whom retaining existing citizenship, or reaching citizenship within a shorter window, is a meaningful factor. For users primarily seeking long-term residence rather than citizenship, permanent residency remains a relevant and attainable path. The April 2026 reform does not affect this route.
The Legal Controversy Is Worth Monitoring
The method of implementation — raising a de facto standard through administrative discretion without amending the Nationality Act — is not yet fully resolved. Legal challenges remain possible. Whether the 10-year operational standard will remain in place as-is, face judicial review, or eventually be codified into legislation remains to be seen. Readers currently in Japan and approaching the 5-year mark should seek direct guidance from a licensed immigration attorney rather than acting on general information alone.
Japan’s April 2026 naturalization reform is a concrete, already-implemented change that directly affects how long-term settlement in Japan should now be planned. For anyone who had been working toward the 5-year citizenship window, that path no longer exists under current policy. Whether you are in Japan now, evaluating it as a destination, or comparing it to other options, the practical timeline has changed and is worth revisiting.
Have a question about what this means for your situation? We can help you think it through — start here.
This article is based on officially verified sources current as of April 2026. Requirements change frequently. Always confirm your specific situation with a licensed immigration attorney or the Ministry of Justice directly.
