US Citizenship Through Marriage: The 3-Year Rule Explained

Under the 3-year rule (INA 319(a)), a permanent resident who has been married to and living with the same US citizen for 3 years can apply for citizenship 2 years earlier than the standard 5-year rule. Your spouse must have been a citizen for the full 3 years, you need at least 18 months of physical presence in the US, and you must stay married until you take the oath. The form (N-400), fee and tests are the same as on the 5-year path.

Key points

• You need 3 years as a permanent resident, 3 years of marriage and living together, and 3 years of your spouse’s citizenship, all at the same time.
• Physical presence: at least 18 months in the US during the 3 years.
• You can file up to 90 days before your 3-year anniversary as a permanent resident.
• Divorce, legal separation or your spouse’s death before the oath ends 3-year eligibility.
• Fees as of October 2026: $760 paper, $710 online. Same English and civics tests as everyone else.

3-year rule vs 5-year rule

Requirement	3-year rule (INA 319(a))	5-year rule (INA 316)
Time as a permanent resident	3 years	5 years
Marriage	Married to and living in marital union with the same US citizen for 3 years	Not required
Spouse’s citizenship	Citizen for the full 3 years	Not relevant
Continuous residence	3 years	5 years
Physical presence	At least 18 months	At least 30 months
State or district residence	3 months	3 months
Early filing	90 days before the 3-year mark	90 days before the 5-year mark
English and civics tests	Same	Same
Fee	$760 paper / $710 online	$760 paper / $710 online

Sources: USCIS citizenship and naturalization, N-400 page, and the fee schedule (G-1055 edition 10/07/26).

The three overlapping clocks

The most common mistake is to count only the marriage, or only the green card. All three of these must be true for the full 3 years before you file:

1. You have been a lawful permanent resident.
2. You have been married to, and living in marital union with, the same US citizen.
3. Your spouse has been a US citizen.

Example A: spouse naturalized recently

Lina got a green card through her employer in January 2022 and married Marco, a green card holder, in 2021. Marco naturalized in May 2024. In January 2025 Lina has 3 years as a permanent resident, but Marco has been a citizen only since May 2024. Lina cannot use the 3-year rule until May 2027, which is after she qualifies under the 5-year rule in January 2027 (or 90 days before). In her case, the 5-year rule is faster.

Example B: marriage-based green card

Sam married Jordan, a US citizen since birth, in March 2022, and received a conditional green card in March 2023. Sam can file under the 3-year rule from about 90 days before March 2026, as long as they still live together, Sam has 18 months of physical presence, and the conditions on residence have been removed or a Form I-751 is pending.

What “living in marital union” means

The USCIS Policy Manual says marital union means you and your spouse actually live together. Being legally married is not enough.

• Legal separation: you are not in marital union during any period of legal separation.
• Informal separation: officers look at the facts case by case, including how long you were apart, whether you kept supporting each other, whether you intended to separate permanently, and whether either of you was involved with someone else.
• Involuntary separation: living apart because of circumstances beyond your control, such as US military service or required work travel or relocation, does not by itself break marital union, unless there is other evidence the marriage has broken down. Incarceration does not count as involuntary separation.

You must stay married until the oath

You must remain the spouse of a US citizen from filing until you take the Oath of Allegiance. According to the Policy Manual, you lose eligibility under the 3-year rule if, before the oath:

• you divorce or the marriage is annulled (even if you later marry another US citizen);
• your spouse dies (a special rule applies to surviving spouses of service members who died on active duty);
• your spouse gives up or loses US citizenship.

If this happens, you may still be able to naturalize under the 5-year rule once you meet it.

Conditional green cards and the I-751

If your green card came through a marriage that was less than 2 years old, it is conditional and lasts 2 years. You must file Form I-751 to remove the conditions. You can file the N-400 under the 3-year rule while the I-751 is still pending. USCIS may decide both cases at the same interview. As of October 2026 the I-751 fee is $750 on paper or $700 online. For timing and evidence, see removing conditions on your green card (Form I-751).

Evidence to include

In addition to the standard N-400 documents, applicants on the 3-year path usually submit:

What to prove	Example documents
Your spouse’s citizenship and when it began	US birth certificate, Certificate of Naturalization, or the passport biographic page plus naturalization date
Your marriage	Marriage certificate; divorce or death certificates for any earlier marriages of either spouse
Living in marital union for 3 years	Joint lease or mortgage, joint tax returns, joint bank statements, insurance listing each other, children’s birth certificates
Your own eligibility	Green card copy, travel history, tax transcripts, court records if any

Joint tax returns filed as “married filing jointly” are strong evidence. If you file separately, be ready to explain why.

The interview on the 3-year path

The interview follows the usual format: an N-400 review under oath, the English test (read 1 of 3 sentences and write 1 of 3 sentences correctly), and the civics test. For N-400s filed on or after October 20, 2025, the civics test is the 2025 version: up to 20 questions from 128, pass at 12 correct, stop at 9 incorrect. You can practice with our free US citizenship practice test, which follows the same rules.

Expect extra questions about your marriage: where you live, who lives with you, and your spouse’s date and place of naturalization. Officers may also ask about periods you lived apart. For the full flow, read the US citizenship interview: what to expect.

Under the August 2025 good moral character memo, officers weigh positive factors such as family ties and caregiving, which a marriage-based applicant can document. See good moral character for US citizenship.

Common reasons for denial

• Filing too early, usually because the spouse had not been a citizen for 3 years.
• Not living together, or weak evidence of a shared home.
• Separation or divorce before the oath.
• Too little physical presence (less than 18 months).
• Inconsistent answers between spouses’ records, tax returns and the N-400.
• Problems from the green card case, such as questions about whether the marriage was genuine.

When to talk to a lawyer

Talk to a licensed immigration attorney or DOJ-accredited representative if you live apart from your spouse, are separating, have an I-751 problem, or got your green card through a marriage that has since ended. Questions about whether a marriage was genuine can affect your permanent residence, not just naturalization.

What to do next

1. Check all three clocks: your green card date, marriage date and your spouse’s citizenship date.
2. Count your physical presence to confirm 18 months.
3. Gather proof of living together for the full 3 years.
4. Practice civics with the practice test and follow the N-400 step-by-step guide.
5. Bookmark the US country hub for updates.

General information, not legal advice. Checked against USCIS sources on October 11, 2026.