This guide is general legal information, not legal advice, and does not create an attorney–client relationship. Rules change and vary by state — verify current requirements with official sources or a licensed attorney.
Naturalization is the one immigration process that ends with no more immigration processes. It runs in five stages: confirm you are eligible, file Form N-400, attend biometrics, pass an interview that includes English and civics testing, and take the Oath of Allegiance. Most green card holders qualify after five years as permanent residents — three if married to and living with a U.S. citizen — and the application itself is more of an audit of those years than a new test of worthiness.
Because USCIS replaced the civics exam for applications filed on or after October 20, 2025, this guide reflects the 2025 test now in use.
Key takeaways
- The standard requirements: 5 years as a permanent resident (3 with a U.S. citizen spouse), physical presence for half that period, good moral character, and passing English and civics tests.
- You may file the N-400 up to 90 days before completing the residence period — but not one day earlier.
- Applicants who filed on or after October 20, 2025 take the 2025 civics test: 20 oral questions drawn from a bank of 128, with 12 correct answers needed to pass.
- As of August 2026, the filing fee is $760 on paper or $710 online, with a $380 reduced fee for lower-income households and waivers for qualifying military applicants.
- Trips abroad of six months or more can break "continuous residence" even when total presence is sufficient.
Who qualifies
Before filing, an applicant must generally check every box on this list:
- Age 18 or older at filing
- Permanent resident for at least 5 years — or 3 years if married to, and living with, a U.S. citizen spouse for that period (the common path after a marriage-based green card)
- Continuous residence for the full statutory period, without disqualifying absences
- Physical presence in the U.S. for at least 30 months of the 5 years (18 of 3 for spousal cases)
- Residence for at least 3 months in the state or USCIS district where you file
- Good moral character during the statutory period — and conduct before it can still be considered
- Ability to read, write, and speak basic English and pass the civics test, unless exempt
- Attachment to the Constitution and willingness to take the Oath of Allegiance
Special rules ease several of these requirements for current and former U.S. military members and their families. And how you got the green card matters less than keeping it valid — any of the paths in our green card eligibility overview leads to the same naturalization rules.
Watch the travel math: An absence of six months to a year presumptively breaks continuous residence — you can rebut it with evidence of ongoing U.S. ties. An absence of a year or more breaks it outright absent special protections. Physical presence is a separate, cumulative count of days; you must satisfy both.
The English and civics tests, 2025 edition
The interview doubles as the exam. The English portion tests speaking (through the interview itself) plus short reading and writing exercises. The civics portion changed recently: for N-400s filed on or after October 20, 2025, USCIS administers the 2025 civics test — an oral exam of 20 questions drawn from a published bank of 128, requiring 12 correct answers. Applicants who filed before that date take the older 2008-version test.
Longtime residents get accommodations based on age and years with a green card:
| Rule | Who it covers | What changes |
|---|---|---|
| 50/20 | Age 50+ with 20+ years as a permanent resident | Exempt from English; civics test in language of choice with an interpreter |
| 55/15 | Age 55+ with 15+ years as a permanent resident | Exempt from English; civics test in language of choice with an interpreter |
| 65/20 | Age 65+ with 20+ years as a permanent resident | English exemption plus a simplified civics test: 10 questions from 20 designated ones, 6 correct to pass |
Applicants with qualifying physical or developmental disabilities may seek a full testing exemption through Form N-648, completed by a licensed medical professional. Anyone who fails a test portion gets one retest opportunity, typically scheduled within a few months.
Filing the N-400: fees, timing, and the 90-day rule
The N-400 can be filed online or on paper. As of August 2026, USCIS lists the fee at $710 online or $760 by mail, biometrics included. Households with income at or below 400% of the federal poverty guidelines can request a half-price reduced fee of $380, and full fee waivers exist for those who qualify; certain military applicants pay nothing.
A quirk worth respecting: regulations let you file up to 90 calendar days before your 5-year or 3-year residence anniversary. Filing even a day too early is a denial with no refund. Count carefully from the "resident since" date on the green card.
The form itself reaches back through your history — every trip abroad, every address and employer in the statutory period, tax filing history, and complete criminal history including expunged matters. Consistency with prior filings is checked, so pull your old applications before answering from memory.
From biometrics to the oath
- Receipt and biometrics. After filing, USCIS issues a receipt and, unless it reuses prior prints, schedules fingerprinting for background checks.
- The interview. An officer places you under oath, walks through the N-400 line by line, updates anything that changed, and administers the English and civics tests.
- Decision. Cases are granted, continued (often for documents or a retest), or denied. A denial can be challenged through an administrative hearing on Form N-336, and further review is available in federal court.
- Oath of Allegiance. Citizenship takes effect only at the oath ceremony, where you surrender the green card and receive the naturalization certificate. Some offices offer same-day ceremonies; others schedule them weeks out.
- First documents. Most new citizens apply for a U.S. passport promptly and update Social Security records — the certificate is the proof for both.
Issues worth resolving before you file
The N-400 invites the government to re-examine your entire file, so surface problems first, not at the interview. The classic tripwires: long or frequent trips abroad; unfiled tax returns or unpaid tax debt; unpaid court-ordered child support; a missed Selective Service registration for men who lived in the U.S. between 18 and 26; arrests or charges anywhere in the world, even if dismissed; and anything that could suggest the green card itself was granted in error — because naturalization review can, in a worst case, jeopardize the underlying status. Voting or falsely claiming citizenship in the past are especially serious.
None of these automatically ends the road to citizenship, but each changes the strategy or the right filing date. If any apply to you, a review of your file with a citizenship and naturalization attorney before filing is the cautious sequence — waiting a few months to file cleanly beats explaining a problem under oath.
Frequently asked questions
How long does naturalization take?
Processing varies significantly by field office and fluctuates year to year — recent averages have run from several months to around a year from filing to oath. Check the current USCIS processing time for your local office instead of relying on national figures, and remember the oath ceremony adds time after approval in many locations.
Does the U.S. allow dual citizenship?
U.S. law does not require naturalizing citizens to give up other citizenships, and the oath's renunciation language is not enforced against retaining a foreign passport. The question usually runs the other direction: some countries strip citizenship when their nationals naturalize elsewhere, so check your home country's rules before applying.
What happens if I fail the civics or English test?
You are not denied on the spot. USCIS schedules one retest of the failed portion, generally within a few months of the first interview. Failing the retest results in denial, but you may reapply — with a new fee — whenever you are ready. Under the 2025 civics test, officers stop early once you have 12 correct answers or can no longer pass.
Can I travel abroad while my N-400 is pending?
Yes. Permanent residents remain free to travel while the application is pending, and normal trips are routine. The cautions are the same ones that governed eligibility: keep trips well under six months, maintain your U.S. home, and make sure you still meet the physical presence numbers on your interview date.
Do my children become citizens when I do?
Often, automatically. A child under 18 who is a permanent resident and lives in the legal and physical custody of a naturalizing parent generally derives citizenship by operation of law the moment the parent takes the oath. Families then obtain proof — a passport or a certificate of citizenship — rather than filing a new N-400 for the child.
Getting ready to apply
Start with a one-page self-audit: your resident-since date plus 5 (or 3) years minus 90 days for the earliest filing date; a list of every trip abroad with day counts; your tax, support, and Selective Service status; and any brush with law enforcement, however minor. If the page is clean, gather your documents and study the 128 questions. If it is not, resolve or get advice on each item first.
For related reading — the residence rules that flow from how you got your card, or employer-side compliance for the years in between — browse the guides in our immigration law hub, including the employment-based green card process many applicants completed years earlier.
