Who is a U.S. resident depends on which law is asking. For immigration purposes, a resident is someone who holds a Green Card — a Lawful Permanent Resident. For federal tax purposes, a resident is anyone who either holds a Green Card or spends enough days in the country to meet the IRS’s Substantial Presence Test. States use their own definitions on top of both. The categories overlap awkwardly, and a person can easily be a resident under one set of rules and not another.
Immigration Residency: The Green Card
Under immigration law, a U.S. resident is a Lawful Permanent Resident (LPR). An LPR has permission to live and work anywhere in the United States indefinitely, at any legal job.1U.S. Citizenship and Immigration Services. Rights and Responsibilities of a Green Card Holder Permanent Resident Green Card holders are covered by federal, state, and local laws, can own property, can attend school, and can join certain branches of the military.
The status carries real obligations. LPRs must file federal and state income tax returns each year reporting worldwide income, even income earned abroad. Males between 18 and 25 must register with the Selective Service within 30 days of receiving the Green Card or turning 18.2Selective Service System. Who Needs to Register Any change of address must be reported to USCIS within 10 days on Form AR-11.3U.S. Citizenship and Immigration Services. USCIS Policy Manual Volume 1 Part A Chapter 10 – Changes of Address
LPRs can qualify for Social Security on the same terms as citizens if they have the required work history.4Social Security Administration. Can Noncitizens Receive Social Security Benefits or Supplemental Security They cannot vote in any election, are ineligible for federal jury service, and can be deported for certain criminal convictions or immigration violations.5Office of the Law Revision Counsel. 28 US Code 1865 – Qualifications for Jury Service
How a Green Card Can Be Lost
“Permanent” residence is not automatic and not indestructible. The most common way people lose LPR status is by spending too much time outside the country. USCIS can treat a long absence as evidence that a person has abandoned their U.S. residence, regardless of intent.6U.S. Citizenship and Immigration Services. Maintaining Permanent Residence
Two thresholds matter. An absence of more than six months but less than one year creates a rebuttable presumption of broken continuous residence, which the LPR can overcome with evidence of a continuing U.S. job, home, and immediate family. An absence of one year or more automatically breaks continuous residence for naturalization purposes, unless the LPR obtains an approved Form N-470 before leaving.7U.S. Citizenship and Immigration Services. USCIS Policy Manual Volume 12 Part D Chapter 3 – Continuous Residence
Anyone planning a long stay abroad should apply for a reentry permit first. It is generally valid for two years and prevents USCIS from treating the absence alone as abandonment while the permit is in force.8eCFR. Title 8 Part 223 – Reentry Permits, Refugee Travel Documents, and Advance Parole Documents
Other actions that suggest abandonment include claiming “nonresident alien” status on a tax return, moving abroad with the intent to live there permanently, or voluntarily filing Form I-407 to give up the Green Card. An immigration judge can also order removal, which ends the status outright.6U.S. Citizenship and Immigration Services. Maintaining Permanent Residence
Tax Residency: A Separate Definition
The IRS does not use the immigration definition. A non-citizen is a “resident alien” for federal tax purposes if they meet any one of three tests: the Green Card Test, the Substantial Presence Test, or the first-year election.9Office of the Law Revision Counsel. 26 US Code 7701 – Definitions Meeting any one of them means the IRS taxes worldwide income, the same as it does for citizens.10Internal Revenue Service. Topic No 851 Resident and Nonresident Aliens
The Green Card Test
An LPR at any point during the calendar year is a U.S. tax resident for that year. Residency for tax purposes starts on the first day of physical presence in the U.S. as an LPR.11Internal Revenue Service. US Tax Residency – Green Card Test Even a Green Card received in December triggers full-year resident treatment.
The Substantial Presence Test
A person meets this test with at least 31 days of physical presence in the current year and a weighted total of at least 183 days across a three-year window. The formula counts every day in the current year, one-third of the days in the prior year, and one-sixth of the days in the year before that.12Internal Revenue Service. Substantial Presence Test
An example: 120 days in each of 2024, 2025, and 2026 gives 120 + 40 + 20 = 180 days. Not a resident. Bump the annual figure to 130 days and the total reaches 195 — resident for 2026. People who split time between countries are the ones this test tends to catch.
The First-Year Election
Someone who arrives mid-year and does not yet meet the Substantial Presence Test can elect to be treated as a resident from the date of arrival. That creates a dual-status year and can be useful for filing jointly with a U.S. citizen or resident spouse, or claiming credits that only residents can use.13Internal Revenue Service. Publication 519 US Tax Guide for Aliens
The Mismatch Between Immigration and Tax Status
Immigration status and tax status run on separate tracks. A tourist, temporary worker, or exchange visitor is a non-immigrant under immigration law — no right to stay permanently, authorized only for a specific period. But an H-1B worker who spends enough days in the U.S. will pass the Substantial Presence Test and become a resident alien for tax purposes, obligated to report worldwide income. USCIS still considers that person a non-immigrant; the IRS does not care.14Internal Revenue Service. Determining an Individuals Tax Residency Status
Non-immigrants authorized to work can obtain a Social Security number. Those not authorized to work but who need to file a return receive an Individual Taxpayer Identification Number (ITIN) from the IRS instead.15Social Security Administration. If I Am Not a US Citizen Can I Get a Social Security Number Tax residency also does not create a path to a Green Card or to citizenship. It creates obligations only.
Exceptions to Tax Residency
Closer Connection
A person present in the U.S. for fewer than 183 days in the current year can still avoid resident status by claiming a “closer connection” to a foreign country. That requires a tax home in the foreign country for the entire year and stronger ties there than to the U.S. Anyone who has applied for a Green Card or taken steps toward permanent residency cannot use this exception.16Internal Revenue Service. Closer Connection Exception to the Substantial Presence Test
The claim is made on Form 8840, filed by the tax return due date. Miss the deadline and the exception is generally lost.16Internal Revenue Service. Closer Connection Exception to the Substantial Presence Test
Exempt Individuals
Days spent in the U.S. by certain visa holders don’t count toward the Substantial Presence Test at all. The main groups are students on F, J, M, or Q visas and teachers or trainees on J or Q visas.17Internal Revenue Service. Exempt Individual – Who Is a Student
- Students on F, J, M, or Q visas are exempt for five calendar years. A student who arrived in 2022 is exempt through the end of 2026; days start counting on January 1 of the sixth year.18Internal Revenue Service. Tax Residency Status Examples
- Teachers and trainees on J or Q visas are exempt for two calendar years, provided they have not already been exempt as a teacher, trainee, or student for any part of two of the six preceding years.19Internal Revenue Service. Teacher or Trainee – IRS Courseware
The exemption extends to a spouse and unmarried children under 21 whose visa status derives from the exempt individual’s.17Internal Revenue Service. Exempt Individual – Who Is a Student Every exempt individual must file Form 8843 each year, even with no income and no tax due. Failure to file on time can cause the days to count after all.20Internal Revenue Service. Form 8843 – Statement for Exempt Individuals and Individuals With a Medical Condition
State Residency
States define residency for themselves. Each has its own rules for state income tax, in-state tuition, voting, and driver’s licensing, and none of them are bound by the federal definitions. Two concepts do most of the work.
Domicile is the permanent home — the place a person intends to return to whenever away. Only one domicile is possible at a time, and intent matters more than physical presence. Evidence of domicile includes where a person holds a driver’s license, where they are registered to vote, where they own a home, and where family lives. The state of domicile generally has the power to tax income and to determine eligibility for in-state tuition.
Statutory residency is separate. Most states treat a person as a statutory resident if they maintain a home in the state and spend more than a set number of days there, commonly 183. A person can be a statutory resident of one state and domiciled in another, which sometimes means two states claim the right to tax the same income. Some states use a totality-of-the-circumstances analysis instead of a fixed day count.
Public universities in most states require at least 12 months of physical presence combined with evidence of intent to make the state a permanent home before granting in-state tuition. A move made solely to attend school usually doesn’t qualify, because the stay reads as temporary.
Residency Is Not Citizenship
Residency, in any form, sits below citizenship. U.S. citizenship comes from birth in the United States, birth abroad to U.S. citizen parents, or naturalization.21U.S. Citizenship and Immigration Services. USCIS Policy Manual Volume 12 Part H Chapter 3 – US Citizens at Birth Citizens vote in federal elections, can hold federal office, serve on federal juries, and cannot be deported. No form of residency grants those rights.
LPRs can apply for naturalization after five years of continuous residence, or three years if married to a U.S. citizen.22U.S. Citizenship and Immigration Services. Continuous Residence and Physical Presence Requirements for Naturalization Someone who is only a tax resident — on a work visa, for instance — has no path to citizenship through that status. Tax residency creates paperwork and tax liability; it does not create immigration rights.