Most green card holders can apply for U.S. citizenship after five years as a permanent resident, or after three years if they have been married to and living with a U.S. citizen. Naturalization eligibility also depends on time spent in the U.S., good moral character, and passing English and civics tests. Here is how each requirement works.

What are the basic naturalization eligibility requirements?

To naturalize, you generally must be at least 18, have been a lawful permanent resident for five years (or three if married to a U.S. citizen), meet continuous residence and physical presence rules, show good moral character, pass English and civics tests, and support the principles of the U.S. Constitution.

You also generally need to have lived for at least three months in the state or USCIS district where you file. The application is Form N-400, and most people can file it online.

When can I apply for U.S. citizenship?

You can generally apply five years after the “resident since” date on your green card, and USCIS accepts applications up to 90 days before that anniversary. Under the three-year rule for spouses of U.S. citizens, the same 90-day early filing window applies to the three-year mark.

USCIS offers an early filing calculator to find your first eligible date. Filing even one day too early can lead to a denial and a lost fee, so it is worth double-checking.

How does the 3-year rule for marriage to a U.S. citizen work?

If you have been a permanent resident for three years and married to and living with the same U.S. citizen spouse throughout those three years, you may be able to apply early. Your spouse must also have been a U.S. citizen for that entire three-year period.

The key phrase is “living in marital union.” Separation, divorce, or the spouse’s death before the application is decided can end eligibility under this rule, though you may still qualify under the regular five-year rule. If you became a resident through marriage, see: Marriage-Based Green Card vs. K-1 Fiancé Visa.

What is the difference between continuous residence and physical presence?

Continuous residence means your permanent home stayed in the U.S. without a long break; physical presence means the actual days you spent inside the U.S. You must meet both. They are measured differently, and many people who travel frequently satisfy one but not the other.

• Physical presence: at least 30 months in the U.S. during the five-year period (18 months under the three-year rule). Count the days of each trip abroad.

• Continuous residence: a single trip of more than six months but less than a year creates a presumption that you broke continuous residence. You can overcome it with evidence, such as keeping your job, home, and tax filings here. A trip of one year or more generally breaks continuous residence outright.

Some people working abroad for certain U.S. employers or organizations can preserve residence in advance by filing Form N-470, but it has strict requirements and must be filed before the long absence.

How long can I leave the U.S. before applying for citizenship?

Trips shorter than six months generally do not break continuous residence, though they still count against physical presence. Trips of six months to a year may raise questions you will need to answer with evidence, and trips of a year or more usually reset the clock.

If you have taken several long trips, it often helps to build a complete travel history from passport stamps and travel records before filing, because USCIS will compare your list against its own records.

What does “good moral character” mean?

Good moral character means that, during the required residence period and up to your oath ceremony, your conduct meets the standards of the community. Some conduct can bar eligibility by law, while other conduct is weighed case by case.

In August 2025, USCIS issued guidance directing officers to take a more holistic look: weighing positive contributions, such as community involvement, family ties, education, and steady work, alongside any negative factors. USCIS also announced it may conduct neighborhood investigations in some cases. For most applicants with a clean history, this simply means preparing a complete and honest application.

Which issues can cause problems on a citizenship application?

Most applications move forward without trouble, but a few issues deserve a careful review before filing. None of these automatically means you cannot naturalize, and each depends on the specific facts.

• Long trips abroad that affect continuous residence or physical presence.

• Unfiled or unpaid taxes. Being on a payment plan with the IRS is often workable; not filing at all can raise concerns.

• Any arrest, citation, or charge, anywhere, even if dismissed or expunged. USCIS generally asks for it to be disclosed, along with court records. Some older or minor matters may have no effect; others can raise deeper questions about the green card itself.

• Selective Service. Men who lived in the U.S. between ages 18 and 26 were generally required to register.

• Past immigration history, such as claiming U.S. citizenship, voting, or questions about how the green card was obtained.

• Unpaid child support.

If any of these apply, speak with a lawyer before filing. The N-400 asks about your entire history, and an honest, well-documented answer is usually far better than an omission.

What is on the English and civics test?

At the interview, you generally must show you can read, write, and speak basic English and pass a civics test on U.S. history and government. Applicants who filed on or after October 20, 2025, take the 2025 civics test.

Under the 2025 version, the officer asks up to 20 questions from a list of 128, and you must answer at least 12 correctly. Applicants who filed before October 20, 2025, take the 2008 version (up to 10 questions from 100, with 6 correct to pass). USCIS publishes the full question list and study materials for free.

Some older, long-term residents qualify for exceptions: people 50 or older with 20 years as a resident, or 55 or older with 15 years, may take the civics test in their own language, and those 65 or older with 20 years receive a shorter question list. Applicants with certain disabilities may request a medical exception using Form N-648.

How much does it cost to apply for citizenship?

The current N-400 filing fee is $710 if filed online or $760 on paper. A reduced fee of $380 is available if your household income is at or below 400% of the federal poverty guidelines, and some applicants may qualify for a fee waiver.

The biometrics (fingerprinting) cost is now included in the filing fee. Confirm the fee on the USCIS fee schedule right before you file.

Can military service members naturalize faster?

Yes. Military service can shorten or waive some requirements. Service members with at least one year of honorable service may apply while serving or soon after, and those who served honorably during designated periods of hostilities may qualify with any length of service and without being a permanent resident first.

Military applicants also generally pay no USCIS fee for the N-400. Each military path has its own rules, so check with your installation’s legal office or a lawyer.

Quick naturalization eligibility checklist

Frequently asked questions

Can I travel while my citizenship application is pending?

Generally, yes, but long trips can create problems with continuous residence, and you must attend your biometrics appointment and interview. Keep trips short and make sure you can receive USCIS mail.

Do my children become citizens when I naturalize?

Often, yes. Children under 18 who are permanent residents and live in the U.S. in the citizen parent’s legal and physical custody generally become citizens automatically. They can document it with a U.S. passport or Form N-600.

Do I have to give up my other citizenship?

U.S. law does not generally require you to renounce another citizenship in practice, although the oath includes renunciation language. Whether your other country lets you keep its citizenship depends on that country’s law.

What if I fail the civics or English test?

You generally get a second chance to retake the portion you failed, usually within 60 to 90 days of the first interview. Failing a second time generally results in a denial, but you can reapply.

Talk it through with us

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This article is general information, not legal advice. Reading it does not create an attorney-client relationship.