The short version
- Physical presence: the total number of days you were inside the United States. Most applicants need 913 days (30 months) in the 5 years before filing. Spouses of U.S. citizens applying under the 3-year rule need 548 days (18 months) in the 3 years before filing.
- Continuous residence: whether you kept living in the United States for the whole 5-year (or 3-year) period, with no single trip long enough to break it.
- A trip of more than 6 months but less than 1 year is presumed to break continuous residence, but you can show it didn't.
- A trip of 1 year or more breaks continuous residence, unless you have an approved Form N-470 for certain kinds of work abroad.
- You also need to have lived for at least 3 months in the state or USCIS district where you file.
Physical presence: counting days
Physical presence is simple arithmetic. Add up every day you spent in the United States during the required period before you file Form N-400. In general you need at least half of that period:
- 5-year rule (permanent residents in general): 30 months, which the N-400 instructions put at 913 days, during the past 5 years.
- 3-year rule (spouses of U.S. citizens under INA 319(a)): 18 months, or 548 days, during the past 3 years.
How USCIS counts trip days: the day you leave and the day you come back both count as days in the United States. So a trip that leaves on May 1 and returns on May 10 counts as 8 days outside the country, not 10.
The N-400 asks you to list your trips in Part 8, most recent first. Day trips where the whole trip was completed within 24 hours are not listed.
Having a green card for the whole period does not prove physical presence by itself. The officer looks at your travel history and records, and your own testimony at the interview.
Continuous residence: no break in living here
Continuous residence looks at your trips one at a time instead of adding them up. The Policy Manual says "residence" means your principal, actual dwelling place, regardless of what you intended. What matters for a trip is mainly how long it was:
Trips of 6 months or less
No presumption of a break. One caution: the Policy Manual says an officer may still look at a pattern of many shorter trips and find that continuity was broken, even though each trip was under 6 months.
Trips of more than 6 months but less than 1 year
USCIS presumes the trip broke your continuous residence. A presumption can be overcome: you can show that you kept living in the United States while you were away. The regulation and the N-400 instructions list factors such as:
- you did not quit your job in the United States, and did not work abroad;
- your immediate family stayed in the United States;
- you kept full access to your home in the United States.
The N-400 instructions suggest evidence such as IRS tax transcripts, rent or mortgage statements, pay statements, bank or credit card statements showing regular transactions, car registration and insurance, and your passport stamps. Our N-400 document checklist includes these for a long trip.
Trips of 1 year or more
A continuous absence of 1 year or more breaks continuous residence. This applies to trips during the required period and to trips taken after you file. The only way to preserve it is an approved Form N-470 (see below). A reentry permit lets you come back into the country after a long trip, but the N-400 instructions say it does not preserve continuous residence for naturalization.
When you can apply again after a long trip
If a trip broke your continuous residence, the clock starts again from the day you came back. The regulation and the Policy Manual set the earliest dates:
- After a trip of 1 year or more (5-year rule): you may file 4 years and 1 day after you returned. At that point the long trip still partly falls inside the 5-year look-back, and since that part is more than 6 months, you would have to overcome the presumption described above. If you wait until 4 years and 6 months after you returned, the part of the trip left in the look-back period is under 6 months, so the presumption no longer applies.
- After a trip of 1 year or more (3-year rule): 2 years and 1 day after returning (presumption must be overcome), or 2 years and 6 months (no presumption).
These dates still depend on the 90-day early filing rule and on meeting physical presence. Our citizenship calculator handles the 90-day window and the day count; for a trip of a year or more it won't guess a date, because the right answer depends on your facts.
Worked examples
These are simplified illustrations under the 5-year rule. Your own case depends on all your dates and facts.
1. Many short trips: both requirements met
Amira spends about 4 months a year abroad visiting family, in trips of 2 to 3 months each. Over 5 years that's about 20 months outside, so roughly 40 months inside: more than the 30 months (913 days) needed. No single trip is longer than 6 months, so there is no presumption of a break in continuous residence.
2. One 8-month trip: physical presence met, continuous residence in question
Daniel stays in the United States for years except for one 8-month trip to care for a parent. His total days easily exceed 913. But a trip of more than 6 months is presumed to break continuous residence, so he will need to show he kept his U.S. home, job and ties. The Policy Manual's own example: an applicant on the 5-year rule who was absent for 8 months and returned on August 1, 2018, and who does not overcome the presumption, could not reapply until February 1, 2023.
3. Long trips that each stay under 6 months: physical presence not met
Lin takes two 5-month trips abroad every year. No trip is over 6 months, but that's about 50 months outside in 5 years, leaving only about 10 months inside. Lin does not meet the 30-month physical presence requirement, and the officer may also question continuous residence because of the pattern of trips.
4. Exactly one year away: continuous residence broken
The Policy Manual's example: an applicant leaves on January 1, 2010 and returns on January 2, 2011, exactly 365 days. That breaks continuous residence. The earliest they could apply is January 3, 2015, if they overcome the presumption for the part of the trip still in the look-back period, or July 6, 2015, when no absence of more than 6 months remains in the 5-year window.
Form N-470: preserving residence for work abroad
Form N-470, Application to Preserve Residence for Naturalization Purposes, lets certain permanent residents work abroad for a year or more without breaking continuous residence. In general:
- You must have been physically present in the United States as a permanent resident for an uninterrupted period of at least 1 year before the work abroad.
- You must file it before you have been abroad for a continuous year.
- The work must be for a qualifying employer: the U.S. government, a recognized American research institution, an American firm (or a subsidiary more than 50% American-owned) engaged in developing U.S. foreign trade and commerce, certain public international organizations, or religious work for a qualifying denomination or mission organization.
An approved N-470 protects continuous residence only. It does not waive physical presence, except for U.S. government employees and people performing religious duties, and it does not replace a reentry permit as a travel document. The Policy Manual adds that USCIS can still find that a person abandoned permanent resident status, even with an approved N-470.
The 3-month state or district rule
Separately, you must have lived for at least 3 months in the state or USCIS district where you file. Students may file where they go to school, or where their parents live if they are still financially dependent on them. If you claim to live in more than one state, the regulation looks at where you file your federal income tax returns from.
Taxes and residence
The regulation says that a permanent resident who voluntarily claims "nonresident alien" status to get a tax exemption, or who doesn't file tax returns because they consider themselves a nonresident, raises a rebuttable presumption that they gave up permanent resident status. The N-400 asks about this in Part 9. If this applies to you, talk to an immigration attorney or a DOJ-accredited representative before you file.
Before you file
- Gather old passports and travel records so the trip dates you list in Part 8 are accurate. The officer will go over them at your interview, and our N-400 walkthrough explains that part of the form.
- If you had a trip over 6 months, collect evidence of your U.S. ties from that time.
- If you had a trip of a year or more, or several long trips, get advice from an immigration attorney or a DOJ-accredited representative before filing. The N-400 instructions say an application filed before you meet the requirements will be rejected or denied.
- While you wait for your eligibility date, start studying with the civics practice test and English reading and writing practice.
Sources: USCIS Policy Manual, Vol. 12, Part D, Chapter 3 (continuous residence, absences, examples, Form N-470); Part D, Chapter 4 (physical presence, counting departure and return days); Part D, Chapter 6 (3-month residence, students, early filing); Part G, Chapter 3 (spouses of U.S. citizens, 548 days); 8 CFR 316.5 (residence, absences, students, multiple states, tax filing); Form N-400 Instructions and Form N-400, Part 8 (edition 01/20/25); USCIS: Form N-470. The names in the examples are made up. This is general information, not legal advice.