Most permanent residents wait five years to apply for citizenship. Spouses of US citizens can often apply after three. Under INA 319(a) (8 U.S.C. 1430(a)), a person "whose spouse is a citizen of the United States" may naturalize if, immediately before filing, they have "resided continuously, after being lawfully admitted for permanent residence, within the United States for at least three years," and during those three years have "been living in marital union with the citizen spouse."
As of October 26, 2026, the rule matters for many employment-based immigrants who married citizens, or whose spouses naturalized first. This guide explains the requirements and the common traps. Our guide to naturalization after an employment green card covers the standard five-year rule.
- INA 319(a) allows naturalization after 3 years of continuous residence as a permanent resident for spouses of US citizens.
- The applicant must have lived in marital union with the citizen spouse for the 3 years, and the spouse must have been a citizen for that whole period.
- The applicant needs at least 18 months of physical presence in the US and 3 months of residence in the state or district.
- Divorce, death or the spouse's expatriation before the oath ends eligibility under this rule; a legal separation breaks marital union.
- Separation for reasons beyond the couple's control, such as essential job demands, does not by itself defeat eligibility.
- Form N-400 can be filed 90 days before the 3-year continuous residence period is complete.
What are the requirements?
The regulation lists them (8 CFR 319.1(a), eCFR):
| Requirement | Detail |
|---|---|
| Permanent residence | Lawfully admitted for permanent residence |
| Continuous residence | At least three years after becoming a permanent resident |
| Marital union | "Living in marital union with the citizen spouse for the three years," and "the spouse has been a United States citizen for the duration of that three year period" |
| Physical presence | "At least 18 months" in the United States |
| State or district residence | At least 3 months before filing |
| Other requirements | Good moral character, attachment to the Constitution, English and civics |
How you got your green card does not matter. An EB-2 or EB-3 immigrant who later married a citizen can use the rule once the three years are met.
Why does the spouse's citizenship date matter?
Because the three years run only while the spouse is a citizen. The regulation requires that "the spouse has been a United States citizen for the duration of that three year period" (8 CFR 319.1(a)(3)). This is the most common trap for couples who immigrated together through work. If both spouses got green cards on the same day and one naturalized at five years, the other cannot use the three-year rule immediately; by then they will usually be eligible under the five-year rule anyway.
The rule helps most when one spouse was already a citizen at marriage, or naturalized well before the other reached five years of permanent residence.
What does living in marital union mean?
Actually living together. "An applicant lives in marital union with a citizen spouse if the applicant actually resides with his or her current spouse," and the applicant bears the burden of proving it (8 CFR 319.1(b)(1)). The USCIS Policy Manual adds that an applicant does not qualify if they are not residing with the citizen spouse during the required period, or if "the marital relationship is terminated at any time prior to taking the Oath of Allegiance" (USCIS Policy Manual, Vol. 12, Part G, Ch. 2).
What breaks marital union?
The regulation sets out the cases (8 CFR 319.1(b)(2)):
Divorce, death or expatriation. An applicant is ineligible "if, before or after the filing of the application, the marital union ceases to exist due to death or divorce, or the citizen spouse has expatriated." Eligibility is not restored by marrying another citizen before the oath.
Legal separation. "Any legal separation will break the continuity of the marital union."
Informal separation. Separation "that suggests the possibility of marital disunity will be evaluated on a case-by-case basis."
Involuntary separation. If spouses live apart "because of circumstances beyond their control, such as military service in the Armed Forces of the United States or essential business or occupational demands," the separation, "even if prolonged, will not preclude naturalization." The Policy Manual gives "required travel or relocation for employment" as an example (USCIS Policy Manual, Vol. 12, Part G, Ch. 2), which matters for couples split by job assignments.
Does the marriage itself need to be valid for immigration purposes?
Yes. The Policy Manual explains that the validity of a foreign divorce depends on the law of the country that granted it, and "if the divorce is not final under the foreign law, remarriage to a U.S. citizen is not valid for immigration purposes" (USCIS Policy Manual, Vol. 12, Part G, Ch. 2). People who divorced abroad before remarrying should confirm the earlier divorce was final.
What if you and your spouse live abroad?
Then INA 319(a) usually does not fit, because it requires continuous residence and physical presence in the United States. The regulation also says that if the noncitizen spouse "has never been in the United States, eligibility under this section is not established even though the alien spouse resided abroad in marital union with the citizen spouse during the three year period" (8 CFR 319.1(c), eCFR). Long absences can break continuous residence for any naturalization applicant; our guide to maintaining permanent residence explains how absences are treated.
A separate provision, INA 319(b), covers a person whose citizen spouse is "regularly stationed abroad" working for the US government, "an American institution of research recognized as such by the Attorney General," an American firm or subsidiary "engaged in whole or in part in the development of foreign trade and commerce of the United States," or certain international and religious organizations (8 U.S.C. 1430(b)). It can let the noncitizen spouse naturalize without the usual residence period, but the applicant must be "in the United States at the time of naturalization." Couples relocating abroad for a qualifying employer should look at this before leaving.
When can you file?
Up to 90 days early. USCIS says you may file Form N-400 "90 calendar days before you complete your continuous residence requirement" if your eligibility is based on being a "permanent resident for at least 3 years if you are married to a US citizen" (USCIS, Form N-400). The other conditions, including three years of marital union with a citizen spouse, must still be satisfied.
What evidence helps?
Proof of the marriage and of living together: the marriage certificate, proof of the spouse's citizenship and the date it began, evidence that prior marriages ended, and documents showing a shared home, such as a joint lease or mortgage, joint tax returns and shared bills. Our guide to N-400 changes in 2026 covers new checks USCIS has added to naturalization cases.
What this means for you
- Count three years from the later of your green card date and the date your spouse became a citizen.
- Confirm at least 18 months of physical presence and no long absences that break continuous residence.
- Gather proof of living together for the full three years.
- If you live apart for work, document that the separation is job-driven.
- File up to 90 days before you reach three years, if every other condition is met.
- If either of you divorced abroad before this marriage, confirm the divorce was final under that country's law.
Where to start
If you are still on the way to a green card, our free evaluation at /evaluate/ maps your record against the EB-1A and EB-2 NIW standards, and Frank, our AI assistant at /frank, finds real opportunities to strengthen it. Petitions are reviewed and filed by our partner law firm, Lai & Turner.
Sources
All checked October 26, 2026.
- 8 U.S.C. 1430(a) (INA 319(a)) (Cornell LII). Three-year rule for spouses of citizens.
- 8 CFR 319.1 (eCFR, current text). Eligibility; marital union; loss of marital union; separations.
- USCIS Policy Manual, Volume 12, Part G, Chapter 2. Living in marital union; involuntary separation; foreign divorces.
- USCIS, Form N-400. Filing 90 days early.
Frequently asked questions
Can I apply for citizenship after 3 years if I am married to a US citizen?
Often, yes. INA 319(a) lets a permanent resident apply after three years of continuous residence if they have been living in marital union with their citizen spouse for the three years before filing. The spouse must have been a US citizen for that entire period. You also need 18 months of physical presence and must meet the other naturalization requirements, such as good moral character, English and civics.
My spouse became a citizen last year. Can I use the 3-year rule?
Not yet. The regulation requires that the spouse has been a US citizen for the duration of the three-year period. If your spouse naturalized one year ago, you would need to wait until they have been a citizen for three years, or use the regular five-year rule if you reach five years as a permanent resident first.
Does it matter how I got my green card?
No. The 3-year rule depends on your current marriage to a citizen, not on the basis of your green card. Someone who became a permanent resident through EB-1, EB-2 or EB-3 and later married a citizen, or whose spouse later naturalized, can use it once the three years of marital union with a citizen spouse are met.
We live apart because of my job. Does that break marital union?
Not necessarily. The regulation says that if spouses live apart because of circumstances beyond their control, such as military service or essential business or occupational demands, the separation, even if prolonged, will not preclude naturalization. A voluntary informal separation is evaluated case by case, and a legal separation breaks the marital union.
When can I file the N-400 under the 3-year rule?
USCIS says you may file Form N-400 90 calendar days before you complete your continuous residence requirement when eligibility is based on being a permanent resident for at least 3 years and married to a US citizen. The other requirements, including marital union and the spouse's citizenship, still need to be met for the required period.
Green Card Guide AI is not a law firm and this article is not legal advice. It describes evidence-building strategy in general terms; your attorney determines what belongs in your petition and how it's argued.
