US Citizenship — Time in the US: the rule, how days are counted, examples

Summary

To apply for US citizenship, a green card holder must have been physically in the United States for at least half of the 5 years before filing: 30 months, which US Citizenship and Immigration Services (USCIS) counts as 913 days. A person who applies as the spouse of a US citizen needs 18 months, or 548 days, in 3 years. Only days as a lawful permanent resident count. The days you leave and return count as days in the United States. If you are short on the day you file Form N-400, USCIS denies the application.

Target: At least 913 days in the United States (30 months)
Period: The 5 years immediately before you file Form N-400
Spouse of a US citizen: 548 days (18 months) in the 3 years before filing
A day counts when: You are in the United States, including the days you leave and return
Law: Immigration and Nationality Act section 316(a), 8 CFR 316.2
Run by: US Citizenship and Immigration Services (USCIS)

Who it applies to

Green card holders who plan to file Form N-400 and have travelled a lot in the last 5 years.
Permanent residents who work abroad for part of each year or travel often for business.
Spouses of US citizens who want to use the shorter 3-year route.
People who spent long periods with family abroad and need to know the earliest date they can file.
Anyone filling in the travel history part of Form N-400.

The rule

Section 316(a) of the Immigration and Nationality Act sets two different time rules for naturalisation, and you must meet both. The first is continuous residence: you have lived in the United States as a lawful permanent resident for at least 5 years before you file. The second is physical presence: within those 5 years you were physically in the United States for periods that add up to at least half of that time. The rule in 8 CFR 316.2 gives this as 30 months, and USCIS counts it as 913 days.

If you are married to a US citizen and apply under section 319(a) of the Act, the period is 3 years and the physical presence needed is 18 months, counted as 548 days. On this route you must have lived in marital union with your spouse for those 3 years, and your spouse must have been a US citizen for the whole of that time.

Physical presence is a simple sum of days. USCIS counts the day you leave the United States and the day you return as days of presence. Time before you became a permanent resident earns nothing. You may file Form N-400 up to 90 days before you complete the 5 or 3 years of continuous residence, but the physical presence days must already be complete on the day you file.

Continuous residence looks at single trips, not at the total. An absence of more than 180 days and fewer than 365 days is presumed to break your residence, and you must prove that it did not. An absence of 365 days or more breaks it. For these absences USCIS does not count the travel dates as days abroad. This side of the law is the subject of the tracker US Green Card — Time Away. The United States here means the states, the District of Columbia, Puerto Rico, Guam and the US Virgin Islands, and the Northern Mariana Islands for time on or after 28 November 2009.

The applicant has to prove the days. USCIS states that holding a green card does not by itself prove presence. The officer compares the trips you list on Form N-400 with your passport and with border records, and looks at the whole application.

Why it exists

Citizenship is meant for people who have truly made their life in the United States. Continuous residence shows that your home was in the country. Physical presence adds a plain check that you were actually there for at least half of the time, so that you had the chance to learn the language, the system of government and daily life. A simple count of days is easy to prove and easy to check.

Counting the days

You count the days you were in the United States as a permanent resident during the 5 years, or 3 years, that end on the day you file. It is easier to count full days abroad and take them away from the total.

Fix your filing date and go back exactly 5 years, or 3 years on the spouse route.
List every trip outside the United States in that period, with the date you left and the date you returned.
For each trip count the full days abroad. Leave out the day you left and the day you returned, because both count as days in the United States.
Add the full days abroad and take them away from the number of days in the period. A 5-year period has 1,826 or 1,827 days.
The result must be 913 or more, or 548 or more on the spouse route.
Check each single trip: more than 180 full days abroad puts your continuous residence in question.

How Countr counts it. Countr counts the days it sees you in the United States, including Puerto Rico, the US Virgin Islands, Guam and the Northern Mariana Islands, in the 5 years that end today, and shows them against the goal of 913 days. You enter the date you became a permanent resident, and days before that date earn nothing. You can switch to the spouse route with 548 days in 3 years after confirming its conditions. Departure and return days count as days present. Countr also flags a single absence of more than 180 full days, and one of 365 days or more, and keeps the flag while that trip is still inside your period. Countr does not decide whether you can overcome such a flag, does not work out the early filing date, and does not check the other requirements such as marriage, good moral character or state residence.

Track US Citizenship — Time in the US on your phone.

Countr finds your past trips in your photos and keeps counting from there.

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Examples

Regular trips, enough days

Farid became a permanent resident on 1 October 2021 and wants to file on 1 October 2026. His period runs from 1 October 2021 to 30 September 2026 and has 1,826 days. He made 12 trips abroad with 610 full days outside the United States in total, and no single trip was longer than 90 days. 1,826 minus 610 is 1,216 days of presence. That is above 913, so he meets the physical presence rule.

Half of every year abroad

Lucia has the same period of 1,826 days. Each year she spends one long stay of 190 full days with her family abroad. Five stays make 950 full days abroad, which leaves 876 days in the United States. She is 37 days short of 913 and cannot file yet. Each stay is also longer than 180 days, so each one is presumed to break her continuous residence. She has two separate problems, and fixing the total does not fix the second one.

How travel days change the count

Sam flies out on 1 March and comes back on 10 March. The full days abroad are 2 March to 9 March, which is 8 days, not 10. Over 5 years Sam made 40 such trips. Counting the travel days as absent would give 400 days abroad. Counted the way USCIS counts, it is 320. For a person close to the line, those 80 days can decide whether the 913 days are reached.

Exceptions

The spouse of a US citizen can use 548 days in 3 years, if the couple lived in marital union for those 3 years and the spouse was a citizen all that time.
Some spouses of US citizens who work abroad for the US government or certain American organisations can naturalise under a separate rule with no fixed period of physical presence.
Form N-470 can protect continuous residence during work abroad for certain employers, but it does not waive physical presence, except for US government employees and certain religious workers.
Time in the Northern Mariana Islands counts only from 28 November 2009.
Current and former members of the US armed forces can qualify under special rules with shorter or no residence and presence periods.
You must also have lived for at least 3 months in the state or USCIS district where you file.

Common misconceptions

“I have held my green card for 5 years, so I qualify.”: Five years with a green card meets only the residence period. You must also have been physically in the United States on at least 913 days of those 5 years.
“If I never stay away longer than 6 months, I am fine.”: Short trips protect continuous residence, but they still add up. A person who is abroad for 5 months twice a year is abroad more than half the time and fails the 913-day count.
“Time I spent in the United States on a work or student visa counts.”: No. Only days after you became a lawful permanent resident count toward the 913 days.
“I can file 90 days early, so I only need the days by the interview.”: The 90 days apply to the continuous residence period only. The physical presence days must be complete on the day you file.

Questions and answers

Does the day I fly out of the United States count as a day present?

Yes. USCIS counts both the day you leave and the day you return as days of physical presence in the United States. Only the full days between them are days abroad.

How many days can I be abroad in 5 years and still qualify?

At most 913 full days in a period of 1,826 days, or 914 in a period of 1,827 days. That is the upper limit for the total only. Each single trip must also stay short enough to keep your continuous residence.

What happens if I file with 912 days?

You do not meet the requirement, and the Form N-400 instructions say the application will be rejected or denied. You can file again when the 5 years before the new filing date contain 913 days.

Does a day trip to Canada or Mexico cost a day of presence?

No. If you leave and return on the same day, you were in the United States on that day, so it counts as a day of presence. The same is true for a trip where you return the next day: both travel days count as days present.

Does time in Puerto Rico or Guam count as time in the United States?

Yes. For naturalisation the United States includes Puerto Rico, Guam and the US Virgin Islands, and the Northern Mariana Islands from 28 November 2009.

Is 30 months the same as 913 days?

USCIS treats them as the same requirement and prints both in the Form N-400 instructions: 30 months (913 days) in 5 years, and 18 months (548 days) in 3 years. Counting in days is safer, because months have different lengths.

Sources

Other rules for United States

Arizona Tax Residence 273 days in each calendar year
California Tax — Visitors 181 days in each calendar year
California Tax Residence 273 days in each calendar year
Connecticut Tax — 30 Days or Fewer 30 days in each calendar year
Connecticut Tax Residence 183 days in each calendar year
Delaware Tax Residence 183 days in each calendar year
Hawaii Tax Residence 200 days in each calendar year
Idaho Tax Residence 270 days in each calendar year

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This page explains the rule and how the days are counted. It is not legal or tax advice. The authority decides each case on its own facts.