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Form I-94 is the official arrival and departure record issued by U.S. Customs and Border Protection to every foreign national admitted into the United States. It answers one question — but a decisive one: how long the visitor is authorized to remain on U.S. soil. That date is the benchmark that determines legal status, eligibility for extensions, potential bars on reentry, and future immigration consequences.
Confusing the visa expiration date stamped in the passport with the date recorded on the I-94 is the most common mistake among nonimmigrants — and the most dangerous. The visa authorizes presenting at a port of entry; the I-94 authorizes remaining in the country. When the two dates differ, the I-94 always prevails.
What Is the I-94
For most travelers, the I-94 is generated electronically at the time of admission. Those entering through an international airport or seaport receive the record automatically after inspection, with no physical document. Those entering at a land border — from Canada or Mexico — or via ferry selection may receive a paper I-94. In either case, the I-94 is available for lookup at i94.cbp.dhs.gov using name, date of birth, country of citizenship, and passport number.
The record contains three key fields. The I-94 admission number, a unique identifier required on nearly every future immigration form. The class of admission, indicating the visa category under which the foreign national was admitted — H-1B, F-1, B-2, L-1, O-1, and others. The admit until date, which defines the last day of authorized stay.
Admit Until Date: Specific Date or D/S
The admit until date takes two forms. The first is a specific date indicating the last day of authorized stay. This is the form used for B-1/B-2 tourism and business visas, employment-based visas such as H-1B, L-1, and O-1, and most other nonimmigrant categories. The second form is the notation D/S, short for duration of status, indicating that the foreign national may remain as long as they maintain the conditions of their category.
D/S is typical for F-1 students and J-1 exchange program participants. For these individuals, maintaining status means fulfilling category-specific conditions — full-course enrollment for F-1, affiliation with a designated program and compliance with DS-2019 obligations for J-1. When those conditions are broken, status ends even without a fixed date, and the individual falls out of status.
Visa Expiration Date vs. I-94 Admit Until Date
The distinction between the two dates is the point that generates the most errors. The visa expiration date, printed on the stamp affixed to the passport, is the window during which the foreign national may arrive at a port of entry and request admission. It has no bearing on how long they are authorized to remain once admitted.
After admission, the clock that counts is the I-94’s. It is common for a Brazilian tourist to receive a B-1/B-2 visa valid for ten years and, upon entry, have an admit until date set at six months. They cannot remain ten years — they may remain six months. For a new stay, they must depart and reenter before the I-94 expires, or formally apply for an extension of status.
In some situations, the I-94 date may even outlast the visa: the visa expires while the foreign national is still lawfully in the United States under a valid I-94. Remaining is legal — but any departure ends the status, requiring a new visa before reentry.
How to Check the I-94 Online
The official portal at i94.cbp.dhs.gov allows four different queries. The first retrieves the most recent I-94, with admission number, class of admission, and admit until date. The second generates an official PDF copy, valid for presentation to government agencies, schools, employers, and financial institutions. The third shows a five-year travel history, listing entries and departures recorded by CBP. The fourth checks current compliance status, indicating days remaining until expiration.
Access requires basic information: full name as it appears in the passport, date of birth, country of citizenship, and the document number used at admission. Minor discrepancies — such as a name with extra or missing spaces, or a passport number with the wrong prefix — may prevent the record from being found. In those cases, trying slight variations or contacting a Deferred Inspection Site directly is recommended.
Identifying and Correcting Errors Early
The admissions process involves human judgment and manual data entry in some decisions. Errors happen: wrong admit until date, class of admission that doesn’t match the visa presented, misspelled name, transposed passport number. Correction is straightforward in the short term and complicated in the long term.
Shortly after arriving, the foreign national should check the I-94 online and verify three things: admission date, class of admission, and admit until date. If a discrepancy is found, they should go to the international airport or port of entry through which they arrived — all have a CBP Office with secondary inspection — or one of more than 70 Deferred Inspection Sites across the United States. Correction is free and generally completed the same day if done within the first days of the stay.
The longer time passes, the harder it becomes to reconstruct the factual sequence and the more resistance the system offers. Old errors may require an attorney and generate RFEs on later applications. The practical rule is to check the I-94 within the first 48 hours of admission.
Visa Categories with Special Dynamics
Some categories have their own I-94 dynamics. F-1 students and J-1 exchange visitors receive D/S and maintain status as long as they fulfill their specific obligations — full-course enrollment for F-1, affiliation with a designated program for J-1. Temporary workers on H-1B, L-1, O-1, and similar visas receive a specific date generally aligned with the approved petition’s validity — Form I-129 for H, L, and O categories. B-1/B-2 visitors typically receive up to six months per stay, regardless of the visa’s multi-year validity.
Canadian citizens enter the United States without a visa stamp for most B categories and may receive a paper I-94 only in specific situations. Citizens admitted under the Visa Waiver Program — WT/WB designations — are admitted for up to 90 days and are not eligible for an extension inside the United States.
Extensions and Changes of Status
Foreign nationals in various nonimmigrant categories — F-1 under certain conditions, H-1B, H-4, L-1, L-2, O-1, O-3, E-2, R-1, among others — may apply for an extension before the I-94 expires using Form I-539 for dependents or Form I-129 for principal workers. The application must be filed before expiration; filing after turns the situation into an overstay with a pending request, which USCIS treats more strictly.
Some categories do not permit extensions inside the United States. Transit visitors in category C, crewmembers in category D, K-1 fiancé(e)s and their K-2 dependents, S witnesses beyond the three-year limit, transit without visa (TWOV) travelers, and Visa Waiver Program WT/WB participants must depart and, where applicable, reapply from abroad. For K-1 holders, the 90-day stay presupposes marriage within the deadline and adjustment of status to lawful permanent resident; there is no extension as a K-1.
Consequences of Overstay
Remaining beyond the admit until date without a pending extension constitutes an overstay. The effects are layered and cumulative. The first is automatic invalidation of the current visa — the next reentry requires a new visa, typically applied for at the consulate in the country of citizenship. The second is the inability to apply through a consulate outside that country, a restrictive rule that often surprises foreign nationals living in third countries.
The third effect applies when the overstay exceeds 180 continuous days: a three-year bar on reentry from the date of departure. When it exceeds one continuous year, the bar extends to ten years. These bars may, in limited cases, be waived — Form I-601 or I-601A — but the process is burdensome, time-consuming, and expensive, with variable approval rates depending on individual history and the immigration category being sought.
There are also collateral consequences: harm to future Green Card applications via adjustment of status, blocking of programs such as ESTA for otherwise eligible nationals, and a flag in the immigration record that appears in any subsequent federal screening.
Building a Compliance Routine
The practical rule for avoiding surprises is to build discipline around four habits. Check the I-94 within the first 48 hours after each admission. Record the admit until date separately — in a calendar, spreadsheet, or recurring reminder set thirty days in advance. Treat the visa stamp’s expiration date as secondary information, subordinate to the I-94. Begin any extension, change of status, or adjustment process at least 90 days before expiration, where applicable.
For profiles with recurring travel — B-1/B-2 executives, H-1B professionals on international projects, F-1 students during OPT — reviewing the travel history on the CBP portal after each return is worthwhile. The system sometimes fails to record a departure correctly, and early correction prevents an apparent overstay from appearing on future applications.
Form I-94 is a simple document, but it is the final word on who is in lawful status and who is not. Treating it as the most important document of the stay — above the visa and even the passport — is the safest way to maintain status, preserve future eligibility, and build an immigration record free of setbacks.
Victoria Harper
Editor-in-Chief
Leading journalism and editorial content at Visto n’ Visa, Victoria helps make immigration topics clear, trustworthy, and easy to understand. Her focus is on delivering useful, human, and relevant content for people exploring new paths abroad.
