Title 8 of the U.S. Code: Immigration and Nationality Act

Title 8 of the US Code, formally titled “Aliens and Nationality,” is the body of federal law that governs immigration and citizenship in the United States. It codifies the Immigration and Nationality Act of 1952 along with decades of amendments, and it controls who may enter the country, how long they may stay, how they can become permanent residents or citizens, and when the government can remove them. It also defines the protections available to refugees and people seeking asylum.

Almost every question about legal status in the United States eventually routes back to a section of Title 8. Below is what the statute actually does, section by section, so you can find your bearings before drilling into any single provision.

Which Agencies Enforce Title 8

Congress split enforcement of Title 8 across three cabinet departments, and a single case can move through all of them.

The Department of Homeland Security runs day-to-day operations. Within DHS, U.S. Citizenship and Immigration Services (USCIS) adjudicates visa petitions, green card applications, and naturalization requests. Immigration and Customs Enforcement (ICE) handles interior enforcement and deportation. Customs and Border Protection (CBP) staffs ports of entry and the border.

The Department of Justice runs the immigration courts through the Executive Office for Immigration Review. Immigration judges decide removal cases there, and appeals go to the Board of Immigration Appeals, also inside DOJ. The Department of State operates U.S. consulates abroad and processes visa applications for people who have not yet entered the country.

Immigrant Visa Categories and Annual Caps

Title 8 draws a hard line between immigrant visas, which lead to permanent residency, and nonimmigrant visas, which authorize temporary stays for tourism, study, or work. The annual supply of immigrant visas is capped by statute: family-sponsored visas have a floor of 226,000 per fiscal year, employment-based visas are set at 140,000, and the diversity lottery makes 55,000 visas available to nationals of countries with historically low immigration rates.¹ These caps are what create the multi-year backlogs that shape most immigration planning.

Family-Sponsored Preferences

Family-sponsored immigrant visas are split into four preference categories:

First preference (F1): unmarried adult sons and daughters of U.S. citizens, up to 23,400 visas.
Second preference (F2): spouses, minor children, and unmarried adult sons and daughters of lawful permanent residents, up to 114,200 visas, with at least 77 percent going to spouses and minor children.
Third preference (F3): married adult sons and daughters of U.S. citizens, up to 23,400 visas.
Fourth preference (F4): siblings of U.S. citizens (if the citizen is at least 21), up to 65,000 visas.²

Immediate relatives of U.S. citizens (spouses, unmarried children under 21, and parents) are exempt from the caps entirely. That exemption is why a U.S. citizen sponsoring a spouse faces a completely different timeline than a green card holder sponsoring one.

Employment-Based Preferences

The 140,000 employment-based visas are split into five preference levels. EB-1 covers people with extraordinary ability, outstanding researchers, and multinational executives. EB-2 covers professionals with advanced degrees or exceptional ability. EB-3 covers skilled workers and professionals with bachelor’s degrees. Each of the top three categories receives 28.6 percent of the total allocation.²

The Diversity Visa Lottery

The diversity program allocates 55,000 visas annually through random selection open to nationals of countries that have sent fewer than 50,000 immigrants to the United States over the previous five years.¹ Selection alone does not grant a visa; winners still have to meet education or work-experience requirements and pass admissibility checks.

Adjustment of Status From Inside the Country

Foreign nationals already inside the United States can sometimes convert temporary status to permanent residency without leaving, through adjustment of status under 8 U.S.C. § 1255. Three conditions must all be met: the person was lawfully inspected and admitted or paroled into the country, an immigrant visa is immediately available, and the person is admissible.³

The statute generally bars adjustment for people who worked without authorization or fell out of lawful status. Immediate relatives of U.S. citizens are exempt from those bars. For everyone else, an unauthorized job or a lapse in status before filing can foreclose this path entirely and force consular processing abroad.

Anyone with a pending adjustment application who needs to travel internationally should file for advance parole (Form I-131) before departing. Leaving the country without it while the application is pending can be treated as abandonment.⁴

Naturalization Requirements

Naturalization is the process that turns a lawful permanent resident into a U.S. citizen. The core rules are in 8 U.S.C. § 1427. An applicant must have lived continuously in the United States for at least five years after receiving a green card, must have been physically present for at least half of that time, and must demonstrate good moral character throughout the statutory period.⁵ Spouses of U.S. citizens qualify for a shorter three-year residency track under a separate provision. All applicants must be at least 18.

The application is Form N-400, and it asks for a detailed accounting of addresses, employment, international travel, criminal history (including arrests that never led to charges), organizational memberships, and tax filings.⁶ After biometrics, the applicant sits for an in-person interview under oath, plus an English test (reading, writing, speaking) and a civics test on U.S. history and government. Applicants with a qualifying physical or developmental disability can request a medical waiver using Form N-648. Advanced age or general illiteracy alone do not qualify.⁷

Once approved, the applicant is scheduled for an oath ceremony, surrenders the green card, and receives a Certificate of Naturalization.

Grounds That Block Entry or a Green Card

Section 1182 lists the reasons the government can deny someone entry or block adjustment to permanent residency. It is one of the longest provisions in the code and one of the most consequential.

Criminal Grounds

A conviction for a crime involving moral turpitude makes a person inadmissible, as does being convicted of two or more offenses of any kind with combined sentences totaling five years or more.⁸ Drug offenses, trafficking crimes, and certain national security violations trigger separate bars. Because “moral turpitude” has generated decades of case law, immigration consequences should be evaluated before any plea.

Health-Related Grounds

Communicable diseases of public health significance and missing required vaccinations can both block entry. Both are usually resolvable through the immigration medical exam.

Public Charge

The government can deny admission to someone it determines is likely to become primarily dependent on government assistance for basic needs. Under current regulations, only two categories of benefits count: public cash assistance for income maintenance (like SSI or cash benefits under TANF) and long-term institutionalization at government expense.⁹ Medicaid other than long-term institutional care, CHIP, and most non-cash benefits are not considered.

Unlawful Presence Bars

These bars catch people by surprise more than almost anything else in immigration law. Someone who accumulates more than 180 days but less than one year of unlawful presence and then departs voluntarily is barred from returning for three years. Someone who accumulates one year or more of unlawful presence and then departs or is removed faces a ten-year bar.⁸ The trigger is departure, which is why some people with approved petitions are advised not to leave until they can adjust from inside the United States. Waivers exist but require proving extreme hardship to a qualifying U.S. citizen or permanent resident relative.

Waivers

Certain inadmissibility grounds can be waived using Form I-601. The legal standard for many waivers is “extreme hardship” to a qualifying U.S. citizen or permanent resident spouse or parent. USCIS evaluates hardship based on the totality of the circumstances (family ties, medical conditions, financial impact, country conditions). Ordinary consequences of separation or return to another country do not, on their own, meet the standard.¹⁰

Deportability and Removal Proceedings

Once a person has been admitted, a separate section governs whether they can be forced to leave. Under 8 U.S.C. § 1227, the most common grounds for deportation include violating visa terms (like overstaying or working without authorization), committing certain crimes after admission, and document fraud or false claims to U.S. citizenship.¹¹ False citizenship claims carry particularly severe consequences and often result in permanent bars from future immigration benefits.

Removal cases are heard by immigration judges. The statute guarantees procedural rights: the person can hire an attorney (the government will not provide one), examine the evidence, present their own evidence, and cross-examine government witnesses.¹² When someone was lawfully admitted, the government must prove deportability by clear and convincing evidence. When an applicant is seeking admission, the burden runs the other way: the applicant must prove entitlement to enter.

Appeals from an immigration judge’s removal order go to the Board of Immigration Appeals on Form EOIR-26, filed within 30 calendar days of the decision. The Board counts the deadline from receipt at its Clerk’s Office, not from mailing, and it has essentially no authority to extend it.¹³ USCIS denials outside the removal context are appealed on Form I-290B to the Administrative Appeals Office.

Illegal Reentry After Removal

Coming back after being deported is a separate federal crime under 8 U.S.C. § 1326. The base offense carries up to two years in prison. A prior felony conviction, or three or more drug or violent misdemeanors, raises the ceiling to 10 years. A prior aggravated felony raises it to 20.¹⁴ Someone deported before finishing a prison sentence who reenters illegally must also serve the remainder of that original sentence.

Refugee and Asylum Protection

Title 8 creates two parallel tracks for people fleeing persecution, distinguished mainly by where the person is when they ask for help. Both require a well-founded fear of persecution based on race, religion, nationality, political opinion, or membership in a particular social group.

Refugee status applies to people outside the United States who are processed through international resettlement before arriving. The President sets the annual refugee admissions ceiling in consultation with Congress.¹⁵

Asylum is for people who have already reached a U.S. port of entry or are inside the country. The critical deadline is one year: an asylum application (Form I-589) must generally be filed within one year of the applicant’s last arrival.¹⁶ Missing that deadline can be fatal to the claim unless the applicant shows changed country conditions or extraordinary circumstances explaining the delay.¹⁷

Once granted either status, the person can apply for permanent residency after one year of physical presence in the United States.¹⁸

Work Authorization Under Title 8

Not every foreign national in the United States is allowed to work. Some visa categories (H-1B, L-1) include work authorization tied to a specific employer. Others (tourist, most student visas) do not. People who need a standalone work permit apply for an Employment Authorization Document (EAD) using Form I-765.¹⁹ Common EAD-eligible categories include pending adjustment applicants, asylum applicants, and certain dependent spouses.

A significant policy change took effect on October 30, 2025: DHS ended the automatic extension of EADs for renewal applicants. Under the old rule, a timely renewal gave you an automatic extension while the new card was processed. That extension no longer applies for applications filed on or after that date, with limited exceptions such as Temporary Protected Status. USCIS recommends filing renewals up to 180 days before the current EAD expires.²⁰ On the employer side, every U.S. employer must verify work authorization on Form I-9 for each new hire.

Immigration Status Is Not Tax Status

One boundary worth flagging: Title 8 governs immigration status, but tax residency is determined independently by the IRS. The IRS uses a “substantial presence test,” and someone can be a nonimmigrant under Title 8 while still being treated as a U.S. tax resident. A foreign national physically present for at least 31 days in the current year and at least 183 days over a three-year weighted formula is a tax resident, though A, G, F, J, M, and Q visa holders can exclude certain days by filing Form 8843.²¹ Separately, any foreign national with a financial interest in or signature authority over foreign accounts whose combined value tops $10,000 at any point in the year must file an FBAR with FinCEN.²² Neither obligation is found in Title 8, but both routinely surprise people whose only research has been on the immigration side.

1
Office of the Law Revision Counsel. 8 USC 1151 – Worldwide Level of Immigration
2
Office of the Law Revision Counsel. 8 USC 1153 – Allocation of Immigrant Visas
3
Office of the Law Revision Counsel. 8 USC 1255 – Adjustment of Status of Nonimmigrant to That of Person Admitted for Permanent Residence
4
U.S. Citizenship and Immigration Services. I-131, Application for Travel Documents, Parole Documents, and Arrival/Departure Records
5
Office of the Law Revision Counsel. 8 USC 1427 – Requirements of Naturalization
6
U.S. Citizenship and Immigration Services. N-400, Application for Naturalization
7
U.S. Citizenship and Immigration Services. Chapter 4 – Results of the Naturalization Examination
8
Office of the Law Revision Counsel. 8 USC 1182 – Inadmissible Aliens
9
U.S. Citizenship and Immigration Services. Chapter 2 – Definitions
10
U.S. Citizenship and Immigration Services. Extreme Hardship Considerations and Factors
11
Office of the Law Revision Counsel. 8 USC 1227 – Deportable Aliens
12
Office of the Law Revision Counsel. 8 USC 1229a – Removal Proceedings
13
United States Department of Justice. 3.5 – Appeal Deadlines
14
Office of the Law Revision Counsel. 8 USC 1326 – Reentry of Removed Aliens
15
Office of the Law Revision Counsel. 8 USC 1157 – Annual Admission of Refugees and Admission of Emergency Situation Refugees
16
Office of the Law Revision Counsel. 8 USC 1158 – Asylum
17
U.S. Citizenship and Immigration Services. I-589, Application for Asylum and for Withholding of Removal
18
Office of the Law Revision Counsel. 8 USC 1159 – Adjustment of Status of Refugees
19
U.S. Citizenship and Immigration Services. I-765, Application for Employment Authorization
20
U.S. Citizenship and Immigration Services. DHS Ends Automatic Extension of Employment Authorization
21
Internal Revenue Service. Substantial Presence Test
22
FinCEN.gov. Report Foreign Bank and Financial Accounts