Naturalization has a reputation as the easy part of immigration — the paperwork at the end of the road. Usually, that reputation is deserved. But the N-400 has one property people underestimate: it invites the government to review your entire immigration history. For most applicants that review is a formality. For some, it surfaces problems that had been sleeping peacefully for years.

So the right question is not only "am I eligible?" but "is there anything in my file that deserves attention before I invite that review?" Here is the checklist, in plain terms.

1. Enough time with your green card

The baseline requirement is five years as a lawful permanent resident. It drops to three years if all of the following are true: you are married to a U.S. citizen, living with that spouse, and your spouse has been a citizen for those three years.

You can file up to 90 days before hitting the five- or three-year mark.

2. Actually living here — presence and continuity

Two related requirements trip up more applicants than any others:

Physical presence. You must have been physically inside the United States for at least half of the qualifying period — at least 30 months out of five years, or 18 out of three. Count your travel honestly; the form asks for every trip.

Continuous residence. Separately from the day-count, extended single absences can "break" your residence:

  • A trip of more than six months creates a presumption that you broke continuous residence — a presumption you can rebut with evidence that your life remained here (home, job, family, taxes).
  • A trip of a year or more breaks it outright, absent advance planning with specific tools the law provides.

If you have long trips in your history, this is the section to have reviewed before filing. A broken period does not usually mean "never" — it means the clock restarted, and timing your application correctly is the fix.

3. Good moral character

The law requires good moral character during the qualifying period — though the government may look further back. In practice, the recurring issues are concrete:

  • Any arrest, charge, or conviction, anywhere, ever — including matters that were dismissed, expunged, or happened abroad. Disclosure is mandatory; the fatal mistake is concealment, not necessarily the event itself. Some offenses are serious bars; many are not. Know which yours is before filing.
  • Taxes. Unfiled returns and unresolved tax debt matter. A payment plan in good standing is very different from an ignored obligation.
  • Support obligations. Failure to support dependents is a classic character issue.
  • Honesty on this and every prior application. False testimony to obtain an immigration benefit is itself a character bar. If an old application contains an error, the time to address it is before the interview, with advice.

4. English and civics

The interview includes an English test (reading, writing, speaking) and a civics test on U.S. history and government. Two things people often don't know:

  • Age-based exemptions exist. Applicants over 50 who have held a green card for 20 years, or over 55 with 15 years, may take the interview in their own language. Over 65 with 20 years, the civics test itself is simplified.
  • Disability waivers exist for applicants whose medical condition prevents them from learning or testing.

For everyone else: the tests are very passable with preparation, and failing a portion earns a second attempt, not a denial.

5. The oath — and the questions around it

Finally, you must be willing to take the oath of allegiance. A related question I hear often from Turkish clients: does becoming American mean giving up your original citizenship? U.S. law does not require renunciation. Whether your home country permits dual citizenship is a question of its law — one worth answering calmly before the oath, not anxiously after.

When to get help — and when you honestly don't need it

If your history is simple — steady residence, clean record, taxes filed, no long trips, accurate prior applications — you may well be able to file on your own, and an honest lawyer will tell you so.

Bring in a lawyer before filing if any of these are true:

  • any criminal history, however minor or old,
  • trips over six months, or significant time living abroad,
  • anything on a prior application that wasn't fully accurate,
  • a green card obtained through a marriage that later ended,
  • unfiled taxes or unresolved support obligations,
  • any period where your status or registration was in question.

None of these automatically disqualifies you. Each one changes what "prepared" means. The cheapest insurance in immigration law is an hour of honest review before the government begins its own.