How long must you be a permanent resident?

Most applicants for naturalization must have been a lawful permanent resident for at least five continuous years before filing Form N-400, under section 316(a) of the Immigration and Nationality Act (8 U.S.C. section 1427(a)). Applicants married to a U.S. citizen and living with that citizen spouse for at least three years must have been a lawful permanent resident for at least three continuous years before filing, under section 319(a) of the Act (8 U.S.C. section 1430(a)), provided the spouse has been a U.S. citizen for the entire three-year period.

The clock starts on the date USCIS approved the applicant's adjustment of status to lawful permanent resident or the date of admission as a lawful permanent resident at a port of entry, whichever applies; this date appears on the applicant's Permanent Resident Card (Form I-551). Applicants may file Form N-400 up to 90 days before completing the required residency period under USCIS's 90-day early filing rule, but they must still meet all other requirements as of the actual statutory anniversary.

Special shorter periods apply to certain categories. U.S. military service members who serve honorably during peacetime can file under section 328 with one year of permanent resident status, and members serving during designated periods of hostilities can file under section 329 with no permanent resident requirement at all (they can naturalize directly through military service). Spouses of U.S. citizens who are deceased members of the armed forces can file under section 319(d) of the Act. Battered spouses and children may have access to relief under the Violence Against Women Act (VAWA) provisions of section 319(a) and 319(b).

The required residence period is one of three core eligibility requirements for naturalization under section 316, alongside continuous residence, physical presence, and good moral character. Applicants who file before completing the required period (outside the 90-day early filing window) will have their applications denied. Lawful permanent resident status begins on the day of admission or adjustment, regardless of the year shown elsewhere on related documents.