The four timing requirements explained
1. Continuous residence period
5 years as a green card holder (or 3 years if married to a U.S. citizen). You may file up to 90 days early.
2. Physical presence
913 days (30 months) in the U.S. within the 5 years β or 548 days (18 months) within 3 years. Pre-green-card time never counts.
3. No residence-breaking absences
A single trip of 6 months+ presumes a break (rebuttable). 1 year+ breaks it automatically unless preserved in advance.
4. State residency
You must have lived 3 months in the state or USCIS district where you file.
Continuous residence and physical presence are different tests β many denials come from confusing them. You can take many short trips and keep continuous residence yet still fail the 913-day total, or hit 913 days but break residence with one long trip.
The 6-month and 1-year absence rules
USCIS evaluates each single absence:
| Single trip length | Effect on continuous residence |
|---|---|
| Under 6 months | No break (but days still reduce physical presence) |
| 6 months β under 1 year | Presumed break β rebuttable with evidence: you kept your U.S. job, didn't work abroad, family stayed in the U.S., you kept full access to your home |
| 1 year or more | Automatic break β unless you preserved residence in advance (re-entry permit + Form N-470 for qualifying employment). Otherwise the clock restarts |
A broken continuous residence usually means waiting 4 years + 1 day (or 2 years + 1 day under the 3-year rule) from your return before applying again.
What else N-400 requires
- Age 18+ at filing.
- Good moral character for the statutory period β criminal history, honesty on forms, and tax compliance are reviewed (USCIS has also resumed neighborhood investigations).
- English & civics test β reading, writing, speaking English, plus the civics test (the 2025 version applies to filings on or after Oct 20, 2025). Age/residency exemptions exist (50/20, 55/15 rules).
- Selective Service β males who lived in the U.S. between ages 18β26 must have registered.
- Filing fee β $760 online ($710 paper discount situations vary); fee waivers available for low income.
Frequently asked questions
Q. Do many short trips matter if none is over 6 months?
A. They don't break continuous residence β but every day abroad still subtracts from your 913-day total. A dozen 3-week trips over 5 years is 250+ days gone. Count, don't guess.
Q. Where do I find my exact travel history?
A. Your I-94 travel history (CBP website), passport stamps, and airline records. List every trip in Part 8 of Form N-400 β USCIS cross-checks against CBP records.
Q. Does time in the U.S. before my green card count?
A. No. Unlike some countries (Canada gives half-credit), the U.S. counts only days as a lawful permanent resident toward the 913.
Q. When exactly can I file early?
A. Up to 90 days before your 5-year (or 3-year) green card anniversary β but you must already meet physical presence and all other requirements on the day you file.
Q. I broke continuous residence. When can I reapply?
A. Generally 4 years + 1 day after returning to the U.S. (2 years + 1 day under the 3-year rule). An attorney can confirm how the rule applies to your dates.
Sources: USCIS β Continuous Residence and Physical Presence Requirements for Naturalization, Form N-400 Instructions, USCIS Policy Manual Vol. 12. This checker covers timing rules only, provides an estimate, and is not legal advice. Consult an immigration attorney before filing.