Naturalization: the requirements and the N-400 process

Becoming a U.S. citizen takes a green card, time, good moral character, and a test. This guide explains the five- and three-year rules, the 90-day early filing window, travel that breaks continuous residence, the interview and tests, and the risks that make some people wait.

Who can apply

Most people apply for naturalization after holding a green card for five years. You can apply after three years if you have been married to and living with a U.S. citizen for those three years and your spouse has been a citizen the whole time. Other rules apply to people who served in the U.S. military, who may qualify sooner.

You must also be at least 18, have lived in the state or USCIS district where you file for at least three months, and meet the requirements below.

The 90-day early filing window

You may file the N-400 up to 90 days before you reach your five-year (or three-year) anniversary as a permanent resident. The anniversary is the "resident since" date on your green card. USCIS publishes a calculator to find the exact earliest day. Filing even one day too early results in denial, and the fee is not refunded. Filing early does not shorten the other requirements; by the interview you must have the full period of residence and presence.

Continuous residence and physical presence

These are two different tests and both must be met:

Continuous residence means you kept your home in the U.S. for the whole five (or three) years. A trip abroad of more than six months but less than one year is presumed to break it unless you can prove you kept your job, home, family, and tax filings here. A trip of one year or more breaks it automatically, and you must restart the count after you return (with a partial credit in some cases). Breaking continuous residence does not take away your green card, but it delays citizenship.
Physical presence means you were actually inside the U.S. for at least half of the period: 30 months out of five years, or 18 months out of three. Count every trip; USCIS has your travel records.

Gather your passports and reconstruct every trip, with departure and return dates. The N-400 asks for each one.

Good moral character

USCIS looks at your conduct during the five (or three) years before filing and up to the oath, and can look further back for serious matters. Some things are permanent bars: murder, an aggravated felony conviction after November 29, 1990. Some are bars during the period: certain crimes, two or more gambling offenses, habitual drunkenness, prostitution, controlled substance violations (including marijuana even where legal under state law), false testimony to gain an immigration benefit, failing to pay court-ordered child support, and more. Other issues are weighed case by case: unpaid taxes, a DUI, unregistered men who were required to register for the Selective Service between 18 and 26, voting or claiming to be a citizen.

Any arrest, anywhere, even dismissed or expunged, must be disclosed with certified court records. This is the area where honest disclosure protects you and omission destroys the application.

If you have a criminal record, a long trip abroad, or ever claimed to be a U.S. citizen, applying can expose you to removal proceedings. These situations are not automatically disqualifying, but they must be analyzed before you file, not after.

English and civics

At the interview you must show you can speak, read, and write basic English and pass a civics test on U.S. history and government from the official study list. Exemptions exist: you may take the civics test in your language if you are 50 or older with 20 years as a resident, or 55 or older with 15 years; applicants 65 or older with 20 years get a simplified civics list. People with a physical or developmental disability or mental impairment that prevents learning can request an exemption with Form N-648 completed by a licensed medical professional. Check the USCIS N-400 page for the current version of the civics test and the number of questions.

The process, start to finish

File the N-400 online or on paper with the fee (check the current fee schedule; reduced fees and fee waivers exist for low-income applicants).
Biometrics appointment for fingerprints and photo, or reuse of prior prints.
Interview at a USCIS field office, usually several months to over a year later. The officer reviews every answer on your application under oath, asks about your trips, taxes, and record, and administers the English and civics tests. Bring your green card, passports, state ID, tax transcripts, marriage and divorce records, court records, and proof of Selective Service registration if applicable.
Decision: granted, continued (more evidence or a retest within 60 to 90 days), or denied. A denial can be appealed with Form N-336 within 30 days.
Oath ceremony, where you return your green card and receive the Certificate of Naturalization. You are not a citizen until you take the oath.

Common mistakes

Filing before the 90-day window opens.
Underreporting trips abroad.
Not filing tax returns, or filing as a "nonresident" to pay less tax, which can be read as abandoning residence.
Answering "no" to the arrest question because a case was dismissed.
Letting the green card expire during the process. You still need a valid card as ID; if it expires within six months, renew it.
Moving without updating your address with USCIS within ten days, and missing the interview notice.

Documents to gather

Green card, front and back.
All passports covering the last five years, and a written list of every trip.
Tax returns or IRS transcripts for the last five (or three) years.
Marriage certificate, proof of spouse's citizenship, and evidence of living together, for three-year applicants.
Divorce decrees or death certificates ending any prior marriage, for you and your spouse.
Certified court dispositions for every arrest or citation beyond minor traffic tickets.
Selective Service registration or a status information letter.
Proof of child support payments, if you have children not living with you.

How Claudette helps with this

Claudette calculates your exact earliest filing date, reconstructs your travel history with you and checks both the continuous residence and physical presence tests, and screens your record for anything that should be analyzed before filing. She builds the document list, prepares the N-400 from your interview with every trip and address filled in, audits it for inconsistencies with your green card file, assembles the filing package, and gives you a civics and English practice plan tied to your interview date.