Most people apply for U.S. citizenship under one of two timelines. The general rule is based on being a permanent resident for at least five years. A shorter rule applies to permanent residents who are married to a U.S. citizen, and it is based on at least three years. Both use Form N-400, Application for Naturalization, and both have other requirements besides the time period.
The two rules at a glance
USCIS lists the two paths on its Form N-400 page as "Permanent resident for at least 5 years; or" and "Permanent resident for at least 3 years if you are married to a US citizen." Each path then has its own checklist. The table below follows the USCIS pages for each path.
| Requirement | 5-year rule | 3-year rule (married to a U.S. citizen) |
|---|---|---|
| Age | At least 18 when you submit Form N-400 | At least 18 when you submit Form N-400 |
| Time as a permanent resident | At least five years | At least three years |
| Continuous residence | At least five years immediately before filing | At least three years immediately before filing |
| Physical presence | At least 30 months out of the five years immediately before filing | At least 18 months out of the three years immediately before filing |
| Marriage to a citizen | Not part of this rule | Living in marital union with your citizen spouse for the three years immediately before filing; the Policy Manual says you must also remain the spouse until the oath |
| Local residence | At least three months in a state or USCIS district with jurisdiction over your residence | At least three months in a state or USCIS district with jurisdiction over your residence |
| Good moral character | For at least five years immediately before filing | For at least three years immediately before filing, and until you take the Oath of Allegiance |
The 5-year rule in more detail
The USCIS page for permanent residents of five years lists these requirements, among others:
- Be at least 18 years old when you submit Form N-400.
- Show you have been a lawfully admitted permanent resident for at least five years.
- Show continuous residence in the United States for at least five years immediately before the date you file.
- Show you have been physically present in the United States for at least 30 months out of the five years.
- Show you have lived for at least three months in a state or USCIS district that has jurisdiction over your place of residence.
- Show good moral character and an attachment to the principles of the U.S. Constitution.
- Be able to read, write and speak basic English, and have knowledge of U.S. history and government (civics).
- Take an Oath of Allegiance to the United States.
Continuous residence and physical presence are two different tests. Our guide to continuous residence vs physical presence explains the difference.
The 3-year rule in more detail
The USCIS page for people married to a U.S. citizen says you must be a lawfully admitted permanent resident for at least three years, and have been "living in marital union with your U.S. citizen spouse during the three years" immediately before you file. You also need continuous residence as a permanent resident for at least three years, physical presence for at least 18 months out of the three years, and at least three months of living in the state or USCIS district where you file.
The Policy Manual, which USCIS marked current as of October 2, 2026, says the spouse must have been "living in marital union with his or her citizen spouse for at least 3 years immediately preceding the time of filing." It also lists, as a requirement, that the applicant "Continue to be the spouse of the U.S. citizen up until the time the applicant takes the Oath of Allegiance." On the period after you file, it says the statute "does not require living in marital union for the period between the date of filing the application and the date of naturalization," and that "only the existence of a legally valid marriage is required" from filing until naturalization. An older USCIS web page for spouses, last reviewed in 2020, words this part more broadly and includes the period "while we adjudicate your application." Because the two pages differ, do not rely on either summary for your own situation; a licensed immigration attorney can tell you how the requirement applies to you.
The English, civics, good moral character and Oath of Allegiance requirements also apply to this path. That spouse page shows a review date of 11/18/2020, so check it again before you file.
A separate rule exists for spouses of U.S. citizens who are scheduled to be stationed abroad. USCIS describes it on the same page, and it has different residence and presence terms. If that is you, read that section of the page directly.
Filing up to 90 days early
Under either rule, USCIS says you may file "90 calendar days before you complete your continuous residence requirement." You still have to meet every other requirement on the day you file. We explain how this works in our post on the N-400 early filing rule.
Residence after you file
Continuous residence is not only a look back. The Policy Manual says that an absence from the United States of more than 6 months but less than 1 year is presumed to break continuity, and that this "includes any absence that takes place during the statutory period before the applicant files the naturalization application and any absence between the filing of the application and the applicant's admission to citizenship." Our guide to continuous residence vs physical presence goes through the Policy Manual wording on absences.
What these rules do not tell you
Meeting the time period does not mean an application will be approved. USCIS decides each case on its own facts, and the lists above are not complete. Questions about travel, past arrests, taxes or time spent outside the country are the kind of thing a licensed immigration attorney can answer for your situation. You can also see how a filed application moves through the process on our naturalization status page and our Form N-400 guide.
Common questions
Does the 3-year rule apply to anyone who is married to a citizen?
No. USCIS says the shorter period is for permanent residents married to a U.S. citizen, and you must also have been living in marital union with your citizen spouse during the three years immediately before you file. The other requirements in the table apply too.
Do both rules require an English and civics test?
Both lists include the ability to read, write and speak English and knowledge of U.S. history and government. USCIS describes exceptions on other pages. See our guide to which civics test version applies.
Can I file before I reach five years?
USCIS says you may generally file up to 90 days before you meet the required period of continuous residence, as long as all other requirements are met when you file.
How long does an N-400 take once it is filed?
USCIS posts current times at its processing times tool. You can also see our N-400 processing times page.
Official sources
- USCIS: Form N-400, Application for Naturalization
- USCIS: I am a Lawful Permanent Resident of 5 Years
- USCIS: I am Married to a U.S. Citizen
- USCIS Policy Manual, Volume 12, Part G, Chapter 3
- USCIS: Form N-400 Instructions
GreenLight is not affiliated with USCIS or the U.S. government. This article is for informational purposes only and does not constitute legal advice.