US citizenship: the 913-day rule, and why a 6-month trip matters
How USCIS counts the days for naturalization: 913 days in 5 years, travel days, trips of more than 180 days, and filing 90 days early.
To become a U.S. citizen, a green card holder has to pass two day-counting tests at once. One is about how many days you spent in the country. The other is about how long any one trip lasted. Most people know the first; the second is the one that quietly costs people years.
- 5 years as a permanent resident, or 3 if you are married to and living with a U.S. citizen.
- 913 days physically in the U.S. in those 5 years (548 in 3). The day you leave and the day you return both count as days in the U.S.
- No single trip of more than 6 months. USCIS presumes a trip of more than 180 days broke your continuous residence, and a trip of a year or more breaks it.
- You can file up to 90 days early.
What the rules say
“Applicants for naturalization under INA 316(a) are required to demonstrate physical presence in the United States for at least 30 months (at least 913 days) before filing the application.”
“An absence of more than 6 months (more than 180 days) but less than 1 year (less than 365 days) during the period for which continuous residence is required … is presumed to break the continuity of such residence.”
The two requirements are separate, and you need both. USCIS calls them “interrelated but … different requirements”.
Physical presence: counting your days in the U.S.
Physical presence is a count of days: at least 913 of them in the 5 years before you file. USCIS is clear about the travel days:
“USCIS will count the day that an applicant departs from the United States and the day he or she returns as days of physical presence within the United States for naturalization purposes.”
So a trip from 1 to 15 July costs 13 days, not 15, and leaving one evening and coming back the next morning costs none. It is the same way Australia, Canada and the UK count; we compare them in Do the day you leave and the day you return count?
913 days is half of the 1,826 days in five years, so most people pass easily. Frequent travellers, people who split their year between two countries, and anyone working abroad for long stretches should keep count.
Continuous residence: the 6-month trip
This test isn’t about your total. It looks at each trip on its own:
- A trip of more than 180 days but less than a year is presumed to break continuous residence. You can try to rebut the presumption, with evidence that during the absence you didn’t give up your U.S. job or take one abroad, that your immediate family stayed in the U.S., and that you kept your home here.
- A trip of a year or more breaks continuous residence, unless you had an approved Form N-470 for certain work abroad.
- Many shorter trips can also raise questions: “An officer may also review whether an applicant with multiple absences of less than 6 months each will be able to satisfy the continuous residence requirement.”
Two details catch people out. The trip is measured in whole days away, like physical presence: USCIS’s own example, away from January 1, 2010 to January 2, 2011, is “exactly 1 year (365 days)”. And it doesn’t stop at filing: the rule covers “any absence between the filing of the application and the applicant’s admission to citizenship”.
Alex has had a green card since 1 March 2023, so can file from 2 December 2027. A trip of up to 180 whole days leaves that date alone. One day more, and USCIS presumes continuous residence was broken: unless Alex can show it wasn’t, the earliest date becomes 3 November 2031.
Alex got a green card on 1 March 2023 and could file on 2 December 2027, 90 days before the five years are up. Alex plans a long trip home from 1 November 2026. Up to 180 whole days away, nothing changes. At 181, the trip is presumed to break continuous residence. Unless Alex can rebut that, the clock effectively restarts, and the earliest date becomes 3 November 2031: nearly four years later, for one extra day.
Check a long trip before you book it. The difference between 180 and 181 days away is the difference between filing on time and waiting years, or arguing your case with evidence at your interview.
After a long trip: when you can file
Because the 5 years are counted back from the date you file, a long trip eventually ages out of the window. The Policy Manual works through an example: away from January 1, 2010 to January 2, 2011, exactly a year. That broke continuous residence. The applicant could file again from January 3, 2015 if they could rebut the presumption for the part of the trip still inside the window, and “must wait until at least July 6, 2015” if they couldn’t, when less than 6 months of the trip falls within the 5 years.
CitizenDays takes the cautious reading: it treats any trip of more than 180 days as a break, and shows the first date when no more than 180 days of it are inside your window. For the year-long example that is July 6, 2015, the same as USCIS.
Filing 90 days early
You don’t have to wait for the anniversary. USCIS lets you file up to 90 days before you first meet the 5-year residence requirement, and gives an example: if you would first meet it on June 10, 2010, “the earliest that the alien is allowed to file would be March 12, 2010”. You need the physical presence when you file, and you aren’t eligible to naturalize until the full 5 years are complete.
The 3-year path for spouses of U.S. citizens
If you are married to a U.S. citizen, the requirements shrink to three years: continuous residence as a permanent resident for at least 3 years, “physically present in the United States for at least 18 months (548 days) out of the 3 years”, and living in marital union with your spouse for those 3 years, while they were a citizen. The same 90-day early filing applies, and so do the 6-month and 1-year trip rules.
What the application asks for
Form N-400 asks you to “list below all the trips that you have taken outside the United States during the last 5 years”, starting with the most recent, with the date you left, the date you returned and the countries you visited. “Do not include day trips (where the entire trip was completed within 24 hours).” For any trip of more than 6 months, the instructions explain the evidence to send. If your records have gaps, see How to rebuild your travel history.
Questions people ask
Does a weekend in Canada count against me?
Barely. Leaving on Friday and coming back on Sunday is one whole day away (Saturday) for physical presence. List it on the N-400 unless the whole trip took less than 24 hours.
Is “6 months” 180 days?
USCIS writes it as “more than 6 months (more than 180 days)”. A trip of 180 whole days away or fewer doesn’t raise the presumption.
Do days before I got my green card count?
The requirements are about your time as a permanent resident. CitizenDays counts physical presence only from the day you became one.
Can a long trip after I file still hurt me?
Yes. Continuous residence runs until you are naturalized, so a long trip between filing and the oath counts too.
I was away more than 6 months. Is it over?
Not necessarily. The presumption can be rebutted with evidence such as keeping your U.S. job, your home and your family here. Get advice from an immigration attorney before you file.
Sources
- USCIS Policy Manual, Volume 12, Part D, Chapter 4: Physical Presence
- USCIS Policy Manual, Volume 12, Part D, Chapter 3: Continuous Residence
- USCIS Policy Manual, Volume 12, Part D, Chapter 6: Jurisdiction, Place of Residence, and Early Filing
- USCIS Policy Manual, Volume 12, Part G, Chapter 3: Spouses of U.S. Citizens Residing in the United States
- USCIS: Form N-400, Application for Naturalization
We last checked these sources on 6 October 2026.
Let CitizenDays count it for you
Log each trip once. CitizenDays counts every rule the official way, shows the first day you can apply and how many days you have left, and tells you what a trip would change before you book it. Your trips stay on your phone.
Coming soon to iPhone and Android