How the U.S. Visa System Actually Works

Overview: U.S. immigration is a sequence of separate decisions: whether a category fits, whether a petition is required, whether a visa can be issued, whether a person may enter, and which activities are permitted after entry. Different agencies make these decisions, on different forms and on different timelines, and approval at one step does not complete the next. Once the sequence is clear, every individual category guide becomes easier to read.

The journey at a glance

1. Purpose. The reason for the stay (visit, study, exchange, work, business, family or protection) points to a category.
2. Sponsor or petition. Some routes start with an employer or relative filing a petition with USCIS, sometimes after a Department of Labor step. Others let the person apply directly.
3. Visa application abroad. Most travelers complete the online Form DS-160 for a nonimmigrant visaNonimmigrant visaA visa for a temporary stay for a specific purpose, such as study, tourism, or employment, for example F-1, B-2 or H-1B.See it in the glossary or Form DS-260 for an immigrant visaImmigrant visaA visa issued at a consulate to a person intending to live permanently in the United States. On admission the holder becomes a permanent resident.See it in the glossary, pay the required fees and attend a consular interview.
4. Admission. A CBP officer decides admission at the port of entry and records the authorized stay on the I-94I-94The Arrival/Departure Record that U.S. Customs and Border Protection creates when a nonimmigrant is admitted. It shows the class of admission and an Admit Until date, and most are now electronic and available on the CBP I-94 website. USCIS can also issue one when it approves an extension of stay or a change of status.See it in the glossary.
5. Life in status. The category’s conditions on work, study, travel and duration apply from the day of admission.
6. Later changes. An extension, a change of statusChange of statusMoving from one nonimmigrant category to another without leaving the United States, such as from B-2 visitor to F-1 student. It is requested from USCIS, usually on Form I-539 or Form I-129 depending on the category, and USCIS decides in its discretion. The request generally must be filed before the current authorized stay expires, and some categories, such as K-1, cannot change status. It is different from adjustment of status, which leads to permanent residence.See it in the glossary or an adjustment application each has its own form, fee and eligibility rules.
7. Long term. Some paths lead to a green card and, later, to naturalizationNaturalizationThe process by which a permanent resident becomes a U.S. citizen, generally after three or five years of residence, by filing Form N-400.See it in the glossary.

1. The purpose of the stay

The permitted purpose is the starting distinction between categories: a visit, study, an exchange, work for a particular employer, business activity, permanent family reunification or protection. Duration and family relationships can also affect the applicable classification.

A category is not chosen by which form appears easiest. A visitor visa does not become a work visa because the trip is short, and unpaid activity is not automatically permitted. The facts must fit the legal category.

2. The people and agencies

A petitionerPetitionerThe person or employer who files a petition on behalf of a beneficiary, such as a relative filing an I-130 or an employer filing an I-140.See it in the glossary asks the government to recognize a qualifying relationship, job or other basis. The beneficiaryBeneficiaryThe person on whose behalf a petition is filed, such as the relative or worker who would receive the immigration benefit.See it in the glossary is the person for whom that petition is filed. Some routes permit the beneficiary to self-petition. An applicant requests the particular visa, status or benefit.

• USCIS handles many petitions and in-country applications, including extensions, changes of status, adjustment of statusAdjustment of statusThe process of applying for a green card from within the United States, rather than through a consulate abroad. Filed on Form I-485.See it in the glossary and naturalization.
• The Department of Labor handles specified employment certifications, such as labor condition applications and PERM labor certification.
• The Department of State and its consulates issue visas abroad.
• CBP normally decides admission at the border and records the I-94.
• Immigration courts, part of the Justice Department, handle removal proceedings and related matters.

Approval by one agency does not necessarily complete the next agency’s task.

3. Visa, status and I-94 are different

A visa normally allows travel to a U.S. port of entry to request admission. It does not guarantee entry. Its expiration usually concerns when it may be used for travel, not how long a person already admitted may remain, as State’s explanation of visa expiration dates describes.

Status is the classification and conditions under which a person is admitted or granted permission to stay. The I-94 record shows the admission classification and authorized period. A new entry or an in-country approval can produce a new I-94 with different conditions or dates.

An expired visa can coexist with an otherwise authorized U.S. stay. Conversely, an unexpired visa does not excuse staying beyond the authorized period. Some admissions have used D/S, meaning duration of status, rather than a fixed date; the category’s conditions still apply. The dated policy guide explains the court-blocked changes affecting F, J and I admissions.

4. Petition approval is not always status approval

An employer’s I-129 approval may authorize consular processing, or it may also grant an eligible change or extension of status. The approval notice identifies what USCIS granted. Likewise, an approved family I-130 or employment I-140 does not by itself grant permanent residence, work authorization or permission to remain.

An application receipt proves receipt of that application. It does not automatically grant the benefit requested. Certain timely filings have specific continued-stay or continued-work rules; those exceptions must be checked for the exact category.

5. Work and travel need their own permission

Some statuses authorize specified employment with a particular employer. Others require an Employment Authorization Document, or EAD. Some spouses have status-based work authorization; many dependents cannot work. A Social Security number is not, by itself, employment authorization.

Travel can affect a pending change of status, adjustment application, protection claim or required physical presence. Advance parole is permission to seek parole after travel in qualifying circumstances; it is not a visa or a guarantee of admission. The effect of departure depends on the particular application and status.

6. Temporary intent and dual intent

Many temporary categories require an intention to depart when the permitted activity ends. Dual intent allows qualifying temporary status alongside a permanent-residence plan, notably in H-1B and L-1. It does not eliminate the temporary category’s employment and time requirements.

An immigrant petition can affect temporary visa eligibility differently across categories. Application questions require truthful disclosure, and the effect depends on the classification and circumstances.

7. Two routes to a green card

Consular processing usually means completing immigrant-visa processing abroad, then becoming a permanent resident upon qualifying immigrant admission. Adjustment of status means applying inside the United States, usually with I-485, when all eligibility and filing conditions permit it.

Being physically in the country is not enough to qualify for adjustment. Entry history, status violations, the category, visa availability and inadmissibility can matter. Departure can create problems too, so changing routes is not simply an administrative preference.

8. The waiting line

Many immigrant categories have annual limits. The priority date places the case in the relevant queue, and the Visa Bulletin describes availability by category and country of chargeability, usually based on birth.

An approved petition can wait for years before a visa number is available. The bulletin’s filing chart and final-approval chart serve different purposes, and USCIS announces which chart adjustment applicants may use. Immediate relatives of U.S. citizens are not subject to the family preference cap, but still face application processing. The Visa Bulletin tracker shows the current tables.

9. Records and separate family requirements

Entries, exits, status expirations, employment and filing dates help establish a person’s immigration history. Forms, notices, I-94s and supporting records document those events. Agencies publish the required form editions, fees, filing addresses and submission instructions.

Each family member can have a separate status, deadline and application requirement. “Dependent” does not always mean automatically included. The individual category articles explain family rules; the policy guide covers dated changes.

Forms you will meet

• DS-160 and DS-260: the State Department’s online applications for nonimmigrant and immigrant visas.
• I-129: the employer petition for most temporary workers.
• I-130 and I-140: the family and employment immigrant petitions. USCIS explains the Form I-130 process on its own page.
• I-485: the application to adjust status to permanent resident inside the United States.
• I-765 and I-131: employment authorization and travel documents, requested separately from the benefit they support.
• I-20 and DS-2019: program documents issued by schools and exchange sponsors and tracked in SEVIS.
• I-864: the affidavit of support used in most family-based immigrant cases.
• N-400: the application for naturalization.

What the government charges

Fees change, so treat these amounts as a September 29, 2026 snapshot and confirm them on the agency page before paying.

• Nonimmigrant visa application: $185 for most non-petition categories such as visitor, student, exchange, transit and crew visas; $205 for petition-based H, L, O, P, Q and R visas; $315 for E visas; and $265 for K fiance visas, according to State’s fee page. Applicants for A, G, NATO and diplomatic visas do not pay this application fee.
• Immigrant visa application: $325 per person for family-based cases, $345 for employment-based cases and $205 for other categories, on the same State page.
• USCIS filings: the I-130 costs $675 on paper or $625 online, and the I-485 costs $1,440, on USCIS’s fee schedule. Work permits, travel documents and other forms have their own listed fees.
• Visa Integrity Fee: the July 2025 budget law authorized a Visa Integrity Fee for most nonimmigrant visas. State’s published fee schedule, checked September 29, 2026, does not list it, so follow the payment instructions given by the consulate handling the application.
• Costs outside the fee schedules: medical exams, translations, couriers and travel are separate, and category guides note others such as SEVIS or registration fees.

Only government agencies set government fees. A private company’s “processing fee” is not a government fee, and no one can lawfully sell an approval.

Deadlines and how they are counted

Many immigration deadlines are strict. In a September 23 policy alert, USCIS said that from October 23, 2026 a deadline falling on a weekend or federal holiday moves to the next business day only when a statute, regulation or form instruction states the period in days. A filing that must be made before a child’s 21st birthday, or within a year of arrival, has to be received by that date even if it lands on a weekend.

When a case slows down

After an interview, a consular case can enter administrative processing. A refusal under section 221(g) usually means documents or further checks are needed, as State’s visa denial guidance explains. State also publishes appointment wait times and an immigrant visa scheduling tool.

Policy measures can also pause or hold groups of cases. A federal court vacated State’s suspension of immigrant visa issuance for nationals of 75 countries on August 21, 2026, and a State cable dated September 10 tells posts that the immigrant visa and Diversity Visa pauses are no longer in effect. USCIS’s January 1, 2026 memorandum placing holds on benefit requests from certain countries is now marked no longer in effect because of court orders. Ending a pause does not mean any individual application will be approved.

What changed in 2026 that can touch any category

• Public charge. DHS rescinded the 2022 public charge rule effective September 18, 2026. USCIS’s updated guidance applies to Forms I-485 postmarked or submitted on or after that date, and officers now weigh a broader set of factors. Lawsuits challenging the rule are pending.
• Nationality-based restrictions. Presidential proclamations with full or partial entry limits took effect January 1, 2026, and each has its own scope and exceptions.
• Student and exchange admissions. A rule ending duration of status for F, J and I nonimmigrants was postponed by a court on September 14, 2026.
• H-1B. Weighted selection is in effect, and a $100,000 payment policy remains blocked by a court ruling while litigation continues.

The dated policy guide explains the status, scope and source of each item. Read the scope before assuming a measure applies to a particular category.

Fraud, scams and reliable help

Only government sites and official application portals collect government fees. Be cautious about anyone who guarantees an approval, sells a job offer or asks for payment to a personal account. State launched an online tip portal for reporting suspected visa fraud on September 23, 2026, and its fraud warning page describes common schemes. Case-specific legal advice comes from a licensed attorney or a Department of Justice accredited representative; the Justice Department’s directory is a starting point.