Your Complete Guide to the U.S. Citizenship Application

Filing a citizenship application is one of the most important immigration steps you can take. This guide answers the questions we hear most often about the U.S. citizenship application process, updated for 2026.

We’ve walked hundreds of permanent residents through their N-400. If you haven’t started yet, see how to begin the naturalization process step by step. Here we focus on the questions that come up once you’re filling out your application.

What Is the U.S. Citizenship Application (N-400)?

The U.S. citizenship application, officially Form N-400, is what you submit to USCIS to become a naturalized American citizen. It covers your personal history, residency, employment, travel outside the U.S., and moral character over the past several years.

You can file the N-400 on paper or through a USCIS Online Account. Online filing lets you track your case status, upload documents, and receive notices digitally. Either method works, though many applicants find the online account easier to manage.

The application is the first step in a multi-step naturalization process. For full eligibility requirements and a step-by-step guide on how to begin the naturalization process step by step, see our dedicated guide.

What Documents Do You Need for the Citizenship Application?

USCIS requires supporting documents along with your N-400. Gathering these in advance prevents delays. Most applicants need the following:

• Green Card (Form I-551): photocopy of front and back, current and any expired previous versions.
• Government-issued ID: driver’s license, state ID, or passport.
• Travel history records: dates of every trip outside the U.S. during the statutory period (last 5 years, or 3 if married to a U.S. citizen).
• Marital status documents: marriage certificate, divorce decrees, or death certificates of prior spouses if applicable.
• Tax records: last 5 years of tax returns (or 3 if filing under the marriage to a U.S. citizen provision).
• Criminal history records: arrest records, court dispositions, and certified records for any interaction with law enforcement, even if dismissed or expunged.
• Selective Service registration: proof of registration if you are a male who lived in the U.S. between ages 18 and 26 as a green card holder.

Additional documents may be required based on your specific situation. We review your full file before filing to make sure nothing is missing.

How Much Does the Citizenship Application Cost?

As of 2026, the current USCIS fees for Form N-400 are as follows. Fee waivers and reduced fees are available for eligible applicants:

• N-400 filing fee: $760 (includes biometrics, updated 2026 per USCIS fee schedule effective April 2024).
• Fee waiver (Form I-912): available at no cost if you receive means-tested public benefits or meet income guidelines (below 150% of the Federal Poverty Guidelines).
• Reduced fee (Form I-942): partial discount for households at 150-200% of the Federal Poverty Guidelines, reducing the filing fee to $380.
• Payment methods accepted: check, money order, or credit/debit card (Form G-1450) for paper filings; credit/debit card for online filings.

If you are 75 or older, the biometrics requirement is waived and the total fee may differ. We help clients determine whether they qualify for a waiver before filing.

What Happens at the Naturalization Interview?

After USCIS processes your N-400, they schedule you for an in-person interview at a local field office. The officer reviews your application, verifies your documents, administers the English reading and writing tests, and conducts the civics test (10 questions from the 100 official questions, or 20 from 128 if you filed under the 2020 version).

What to bring to your naturalization interview:

• Interview appointment notice (Form N-400): the letter USCIS mailed you with the interview date and location.
• Government-issued photo ID: driver’s license, state ID, or foreign passport with valid visa.
• Permanent Resident Card (Green Card): original, not a copy.
• Original civil documents: birth certificate, marriage certificate, divorce decrees, court dispositions for any arrest (even if dismissed).
• Tax transcripts: IRS-issued transcripts for the last 5 years (or 3 years if applying under marriage provision).

If your interview is rescheduled or you receive a Request for Evidence (RFE), respond within the deadline stated in the notice. Missing a deadline can result in denial.

How Long Does the Citizenship Application Take?

Processing times for Form N-400 vary by USCIS field office and individual case complexity. As of 2026, national averages range from 8 to 14 months from submission to the oath ceremony, though some offices process faster and others slower.

Factors that can extend processing time include a complex travel history, any criminal record, a Request for Evidence (RFE), or a backlogged field office. To track where your case stands, you can check your USCIS case status using your receipt number at any time.

Updated processing times by field office are published by USCIS at egov.uscis.gov/processing-times. We recommend checking that page directly for the most current estimate for your local office.

Common Mistakes That Delay Your Citizenship Application

These are the errors we see most often in N-400 applications. Any of them can trigger an RFE or outright denial:

• Incomplete travel history: every trip outside the U.S. must be listed, including short weekend trips. Missing even one can create inconsistencies USCIS will flag.
• Failing to update your address (Form AR-11): you have 10 days to notify USCIS of any address change. A missed notice can cost you your interview date.
• Inconsistencies with prior forms: the N-400 must match your I-485 or other USCIS records exactly. Discrepancies in dates, names, or addresses cause delays.
• Not disclosing arrests: under current law, even dismissed charges, expunged records, and arrests that did not lead to conviction must be disclosed on the N-400.
• Traveling during the process: for guidance on safe travel windows, see can I travel while my application is pending before booking any trip.

Citizenship Preparation Classes and Resources

Free and low-cost citizenship classes are available across the U.S. through libraries, nonprofits, and community organizations. The USCIS Citizenship Resource Center (uscis.gov/citizenship/resources) lists class locations by zip code. USAHello also offers free online civics study tools in multiple languages, helpful for Spanish-speaking applicants preparing in English.

Classes cover the 100 civics questions, English reading and writing, and basic application review. Attending one before your interview is a practical way to reduce anxiety and avoid surprises.

If you have learning disabilities or physical limitations, you may qualify for a disability exception or accommodation. Submit Form N-648 (Medical Certification for Disability Exceptions) with your N-400 if applicable.

Ready to move forward? Our team has helped hundreds of Houston-area immigrants complete their citizenship application successfully. Contact us to review your eligibility and get your N-400 right the first time.

Frequently Asked Questions about the Citizenship Application