U.S. Immigration, Explained

Immigrant vs nonimmigrant visas

The most basic distinction in U.S. immigration is between immigrant and nonimmigrant visas. The vocabulary matters because almost every other decision flows from it.

An immigrant visa — what people usually mean by "green card" — confers lawful permanent residence. You can live and work in the United States indefinitely, travel internationally and return, and after several years apply for U.S. citizenship.

A nonimmigrant visa is temporary. It allows you to be in the United States for a defined purpose — work, study, business, tourism — for a defined period. Some nonimmigrant categories permit long stays and renewals (H-1B, L-1, O-1, F-1); others are short and specific (B-1, B-2, tourist).

Many people enter the United States on a nonimmigrant visa first and pursue a green card later. That is normal. The right question at the outset is not "do I qualify for a green card today?" but rather "what is the path that fits my situation — and is there a temporary visa that bridges to it?"

The categories of green cards

Permanent residence is granted through a defined set of categories. Most people fit one or two of them.

Family-based green cards

The largest share of green cards each year goes to family members of U.S. citizens and lawful permanent residents. How quickly you can immigrate depends on two factors: your relationship to the sponsor, and the sponsor's own status.

Immediate relatives (no annual cap)

If you are the spouse, parent (where the citizen is 21 or older), or unmarried child under 21 of a U.S. citizen, you are an immediate relative. There is no annual numerical cap on green cards for immediate relatives, which means you do not have to wait in line for a visa number — your case can proceed as quickly as USCIS and the consulate process it.

Family preference categories (annual caps; waiting lines)

If you are related to a U.S. citizen or LPR but do not fit the immediate-relative definition, your case falls into one of the family preference categories:

• F1 — Unmarried adult sons and daughters (21+) of U.S. citizens
• F2A — Spouses and unmarried children (under 21) of LPRs
• F2B — Unmarried adult sons and daughters (21+) of LPRs
• F3 — Married sons and daughters of U.S. citizens
• F4 — Siblings of U.S. citizens (where the citizen is 21+)

Each category has an annual numerical cap. When demand exceeds supply, applicants wait for a visa number based on the date their petition was filed (the priority date). Waiting times vary dramatically — from a year or two for some categories to a decade or more for F4, particularly for applicants from countries with high demand. The Department of State publishes the monthly Visa Bulletin showing where current priority dates stand.

Financial sponsorship

For most family-based cases, the sponsoring relative must file an Affidavit of Support (Form I-864) pledging to maintain the immigrant at or above 125% of the federal poverty guidelines. If the relative does not meet the income threshold, a joint sponsor can take on that financial obligation.

Employment-based green cards

Employment-based green cards are issued in five preference categories. Each year, about 140,000 immigrant visas are available across all five categories combined, with per-country limits that produce significant backlogs for applicants from countries with high demand — particularly India and China.

EB-1 — Priority workers

Three subcategories: EB-1A (individuals with extraordinary ability in the sciences, arts, education, business, or athletics — self-petitioned, no employer required); EB-1B (outstanding professors and researchers); and EB-1C (multinational executives and managers).

EB-2 — Advanced-degree professionals and exceptional ability

For workers with U.S. advanced degrees (or bachelor's plus five years of progressive experience), or individuals with exceptional ability in the sciences, arts, or business. EB-2 includes the National Interest Waiver (NIW) — a self-petition path that allows applicants to bypass the labor certification requirement when their work is in the national interest.

EB-3 — Skilled workers, professionals, and other workers

For workers with at least two years of training or experience, professionals with bachelor's degrees, and certain unskilled workers in occupations facing labor shortages. EB-3 cases typically require employer sponsorship and a labor certification (PERM) showing no qualified U.S. workers are available.

EB-4 — Special immigrants

Religious workers, certain broadcasters, Afghan and Iraqi nationals who assisted U.S. government efforts, special immigrant juveniles, and several other narrowly defined groups.

EB-5 — Immigrant investor program

For foreign nationals making a qualifying investment in a U.S. commercial enterprise that creates at least ten full-time jobs for U.S. workers. Under the EB-5 Reform and Integrity Act of 2022, the minimum investment is $1,050,000 generally, or $800,000 for investments in a designated Targeted Employment Area (TEA) — rural areas or areas with high unemployment. EB-5 cases involve complex investment, source-of-funds, and job-creation requirements; competent legal and financial counsel is essential.

Humanitarian green cards

Several pathways exist for individuals fleeing persecution or facing harm.

• Asylum and refugee status — for those fearing persecution in their home country based on race, religion, nationality, political opinion, or membership in a particular social group.
• VAWA self-petitions — for abused spouses, children, and parents of U.S. citizens and LPRs. These are confidential filings; the abuser is not notified and cannot interfere.
• U visa — for victims of qualifying crimes who assist law enforcement.
• T visa — for victims of human trafficking.
• Special Immigrant Juvenile Status (SIJS) — for certain immigrant children who have been abused, neglected, or abandoned.

These categories carry specific legal protections — including, for VAWA, U, and T cases, the confidentiality protections under 8 U.S.C. §1367 that prohibit USCIS from disclosing information about a petition to the abuser or perpetrator.

Diversity, longtime-resident, and other paths

The Diversity Visa (DV) Program awards up to 50,000 green cards each year by random selection from a pool of qualifying applicants from countries with historically low immigration rates to the United States. Applicants register during an annual entry period; selection is by lottery.

The registry provisions allow longtime residents of the United States — those continuously present since before January 1, 1972 — to apply for green cards. This is a narrow path that affects relatively few current applicants because of the cutoff date.

Several other narrow categories exist for specific situations — Cuban Adjustment Act applicants, certain American Indians born in Canada, employees of qualifying international organizations, and others. Most prospective immigrants will not fit these categories, but they are worth knowing exist if your situation is unusual.

Requirements that apply to most paths

Across most green card categories, applicants must meet several baseline requirements:

• Admissibility. Applicants must not be inadmissible under the Immigration and Nationality Act — which addresses health-related grounds, certain criminal history, security concerns, prior immigration violations, and other defined categories. Waivers exist for some grounds; not all are waivable.
• Medical examination by a USCIS-designated civil surgeon (or panel physician abroad), covering vaccinations, communicable diseases, mental health, and substance use.
• Background and biometrics — fingerprints, photographs, and a security check.
• Documentary support establishing identity, qualifying relationship or eligibility, and immigration history.
• Financial support showing — particularly for family-based cases, demonstrating the applicant will not become a public charge.

Government fees

USCIS and the Department of State charge filing fees for each petition and application in the green card process. Fees vary by category and have been adjusted multiple times in recent years — most recently in significant fee increases that took effect in April 2024. There are also costs for the medical examination, document translations, and (depending on category) labor certification or premium processing.

Because USCIS fees change periodically, the most reliable approach is to check the current fee schedule and use the USCIS fee calculator (linked in the sources at the bottom of this page) when budgeting for your case. Filing fees are generally nonrefundable, so it is worth confirming the current amounts before submitting.

The application process

The general shape of a green card application is similar across categories, with two main pathways depending on where the applicant is physically located.

Adjustment of Status (applicants inside the U.S.)

If the applicant is already inside the United States in a valid status, they generally file Form I-485 to adjust to lawful permanent resident status without leaving the country. The case is processed by USCIS, with biometrics and (usually) an interview at a USCIS field office.

Consular Processing (applicants outside the U.S.)

If the applicant is abroad, the case goes through the U.S. Department of State. After USCIS approves the underlying petition, the case is transferred to the National Visa Center, which collects fees and documents, and ultimately schedules an immigrant visa interview at a U.S. embassy or consulate in the applicant's country.

The general steps

1. The sponsor files the underlying petition

   Form I-130 for family-based cases; Form I-140 for most employment-based cases; Form I-360 for VAWA, special immigrant, and similar; Form I-526E for EB-5.

2. USCIS adjudicates the petition

   Approving, denying, or issuing a Request for Evidence for more documentation. In some cases — like EB-2 NIW or EB-1A — the petitioner files for themselves.

3. The applicant waits for visa availability

   For categories subject to numerical limits, the applicant waits until their priority date is current under the monthly Visa Bulletin. Some applicants can file concurrently with the petition; others must wait.

4. The green card application is filed

   Form I-485 (inside the U.S.) or DS-260 through the National Visa Center (consular processing).

5. Biometrics and medical examination

   Fingerprints and photograph at a USCIS Application Support Center, or as part of consular processing. Medical examination by a designated civil surgeon or panel physician.

6. The interview

   At a USCIS field office for adjustment cases; at a U.S. embassy or consulate for consular processing cases. Some categories may have the interview waived in certain circumstances.

7. Decision and issuance

   If approved, an adjustment case results in a green card mailed to the applicant's U.S. address. A consular case results in an immigrant visa stamped in the applicant's passport; the green card is mailed after entry to the U.S.

Wait times and the Visa Bulletin

The U.S. immigration system imposes annual numerical caps on most green card categories, with additional per-country limits. When demand exceeds supply, applicants wait in a queue based on their priority date — the date the underlying petition was filed (or, for some employment-based cases, the date the labor certification was filed).

The Department of State publishes a monthly Visa Bulletin showing where the cut-off dates stand for each category and country of chargeability. Each month, USCIS also issues a determination of which chart applicants can use for filing — the Final Action Dates chart or the more permissive Dates for Filing chart.

After your green card is approved

Once you are a lawful permanent resident, you can live and work anywhere in the United States, travel internationally and return, sponsor certain family members for their own green cards, and after a qualifying period apply for U.S. citizenship.

Conditional vs. unconditional green cards

If you obtained your green card through marriage to a U.S. citizen or LPR less than two years before approval, your initial green card is conditional and valid for two years. You must file Form I-751 to remove the conditions within the 90-day window before the conditional card expires. Failure to file on time can result in loss of status. The same conditional structure applies to EB-5 investors, who file Form I-829 to remove conditions.

Maintaining your green card

Permanent residents must maintain U.S. residence — extended absences (typically over a year, or sometimes shorter periods with other indicators of abandonment) can be treated as abandonment of LPR status. Criminal convictions, certain immigration violations, and security concerns can also lead to removal proceedings.

Renewal and replacement

Unconditional green cards are issued for ten years and must be renewed before they expire. Renewal does not affect your underlying LPR status — only the physical card. Form I-90 is used for renewal and replacement.

Citizenship

Most LPRs become eligible to apply for U.S. citizenship after five years of permanent residence (three years for those who obtained status through marriage to a U.S. citizen and remain married). Naturalization requires meeting continuous residence and physical presence requirements, demonstrating good moral character, passing English and civics tests, and taking the oath of allegiance.

Recent developments to know about

U.S. immigration policy has seen several material changes in 2025 and 2026 that affect applicants across multiple categories. The most consequential:

Each of these developments has been covered in depth in dedicated articles — links in the related-content cards near the bottom of this page.

Common pitfalls

A few patterns come up consistently across years of practice. Most are avoidable with awareness.

The 90-day rule

USCIS will closely scrutinize an adjustment of status application filed within 90 days of entry on a nonimmigrant visa if the applicant's conduct contradicts the purpose of that visa. Someone who entered on a B-2 tourist visa and then quickly filed for a marriage-based green card, for example, may face questions about whether they misrepresented their intent at entry. This does not mean adjustment within 90 days is impossible — but it does mean honesty about your situation at the consular interview and the port of entry matters.

Prior visa violations and unlawful presence

Overstays, unauthorized work, and prior unlawful presence can create inadmissibility issues that range from manageable to severe, including multi-year bars on reentry. Some violations are waivable; some are not. If you have any history that might affect admissibility, raise it with counsel before filing — addressing it early is dramatically easier than addressing it after a denial.

Inconsistent paperwork

Inconsistencies between forms, supporting documents, prior filings, and verbal testimony at interview are read by adjudicators as credibility issues. Names, dates, addresses, employment history — these should agree across the entire file. Differences caused by translation, name conventions, or evolving life circumstances are normal, but they should be explained, not left for an officer to discover.

Immigration scams

Anyone promising guaranteed approvals, "special connections" with USCIS or consular officers, or unusually fast processing for a fee is not running an immigration practice. USCIS officials do not solicit additional payments, do not use personal email accounts, and do not communicate through unofficial channels. Report suspected scams to the appropriate authorities.

Self-filing complex cases

Straightforward cases — like a U.S. citizen filing an I-130 for a spouse with no complications — are often handled successfully without counsel. Complex cases — employment-based filings, humanitarian petitions, cases with prior immigration history, RFEs, denials, or any inadmissibility concerns — usually benefit from experienced legal help. The cost of fixing a denied case typically exceeds the cost of preparing the case well the first time.

Common questions