How to Apply for US Citizenship: The N-400 Process Step by Step (2026)

Applying for US citizenship can feel like a wall of forms and waiting. In practice it is a sequence of clear steps, and most applicants move through them in the same order. This is a plain-language overview of the whole process so you can see where you are and what comes next. It is general information, not legal advice, and where your own situation is complicated you should check it with an immigration attorney or an accredited representative.

Step 1: Confirm you are eligible

Before anything else, make sure you actually qualify. Most people apply under the five-year rule (five years as a permanent resident) or the three-year rule (three years, if married to and living with a US citizen). Both paths also require continuous residence, enough physical presence in the United States, good moral character, and basic English. Adding up your travel days and checking your residence history honestly at this stage saves a great deal of trouble later.

Step 2: File Form N-400

Form N-400, the Application for Naturalization, is the heart of the process. You can file it online through a USCIS account, or on paper by mail. Online filing is the default for most applicants, but if you are requesting a fee waiver or reduced fee, you generally have to file on paper.

The form asks about your background, your time as a permanent resident, your trips outside the country, your marital history, and a long set of eligibility questions. Answer everything honestly and consistently with your records. After USCIS receives your application, it sends a receipt notice confirming your case is in the system.

Step 3: Attend your biometrics appointment

A few weeks after filing, USCIS schedules a biometrics appointment at an Application Support Center. There, staff take your fingerprints, photo, and signature for background checks. As of December 2025, every N-400 applicant must attend a new biometrics appointment, because USCIS no longer reuses older biometrics for naturalization. The appointment itself is short, usually about 15 to 20 minutes.

Step 4: The interview and the tests

This is the main event. USCIS calls you to a field office, places you under oath, and an officer reviews your N-400 with you, asking about your answers and your background. In the same appointment, you take the tests:

• The English test: you read one of three sentences aloud, write one of three sentences, and your speaking is assessed through the conversation itself.
• The civics test: an oral question-and-answer. If you filed before October 20, 2025, you take the 2008 test (up to 10 questions, 6 to pass). If you filed on or after that date, you take the 2025 test (up to 20 questions, 12 to pass).

At the end, the officer tells you whether you are recommended for approval, continued (more is needed), or denied.

Step 5: The oath ceremony

If your application is approved, USCIS sends Form N-445, the Notice of Naturalization Oath Ceremony, with the date, time, and place. In some offices the ceremony happens the same day as the interview. At the ceremony you return your green card, take the Oath of Allegiance, and receive your Certificate of Naturalization. At that moment you are a US citizen.

How long does it take

There is no single number, because processing times vary widely by field office. As a realistic range in 2026, the full journey from filing to oath commonly takes somewhere between several months and well over a year. A filing surge in late 2025 pushed waits up in many offices. You can track your own case status through your USCIS account once it is filed.

A quick checklist of the order

1. Confirm eligibility (5-year or 3-year rule, residence, presence, character).
2. File Form N-400 (online or paper).
3. Attend biometrics.
4. Interview plus English and civics tests.
5. Oath ceremony and Certificate of Naturalization.

Where to practise

The one part of this process you can fully prepare for in advance is the civics test. PassCitizen has the complete official civics question set in a free flashcard format, built for the oral style of the real interview, so the questions feel familiar by the time the officer asks them.

Start practising now