US B1/B2 Visitor Rule Explained: Stay Limits & I-94 Overstays

Who needs to read this

The B1/B2 rule governs everyone visiting the US on a visitor visa for business (B-1) or tourism, family, and medical treatment (B-2), and its most dangerous feature is that the real limit is a date most people never look up. Read this if:

• You hold a multi-year B1/B2 visa and assume the visa dates control your stay (they do not)
• You're a parent or relative making long family visits, especially repeated ones
• You're a snowbird spending each winter in the US
• You may need to extend a stay for medical or family reasons
• You want to know how close your US days are creeping toward tax residency

How the rule works

A B1/B2 visitor's authorized stay is whatever period the CBP officer grants at entry, recorded in the electronic I-94: by regulation at least six months for admissible B-2 visitors and never more than one year (8 CFR 214.2(b)). The statutory basis of the category is INA 101(a)(15)(B) (8 U.S.C. 1101(a)(15)(B)): a visitor with a foreign residence "which he has no intention of abandoning," coming temporarily for business or pleasure. The moving parts:

• The visa gets you to the border; the I-94 sets your stay. A 10-year visa is a long-term door key, not a long-term stay permit.
• B-2 visitors found admissible are admitted for a minimum of six months under 8 CFR 214.2(b)(2), even if they ask for less. Officers can and do grant shorter periods when they doubt the trip's purpose, and B-1 business admissions are often shorter.
• One year is the ceiling for any single admission, and extensions come in increments of no more than six months (8 CFR 214.2(b)(1)).
• The temporary-visit premise is enforced. You must be a genuine visitor; using B1/B2 admissions to effectively live in the US violates the category's core condition.

Counting the days

Count from your admission date to the date printed in your electronic I-94 record; that end date, not any number of days you assume, is the limit. Both the arrival day and the departure day are days of presence.

A worked example: you land on February 1 and the officer admits you as a B-2 visitor. Your I-94 shows an admit-until date of August 1, about six months. If you file Form I-539 in June and USCIS approves a six-month extension, your new limit is around February 1 of the next year, the practical maximum for a single visit. If instead you leave on August 3, you have a two-day overstay on an electronic record that never expires.

Rules to burn in:

• Look up your I-94 online after every entry. Officers occasionally grant less than you expect, and the passport stamp (when you get one at all) is not the controlling record.
• Days in the US also feed the tax clock. The Substantial Presence Test counts them with a three-year weighted formula regardless of your immigration status.
• Each admission stands alone. There is no rolling allowance across trips, but there is also no right to a fresh six months every time you return.

Resets, extensions, and edge cases

A new admission restarts the stay clock, and Form I-539 is the only way to lengthen a stay from inside the US. The edge cases:

• Extensions: file Form I-539 with USCIS before your I-94 expires, with evidence of why the longer stay is still a temporary visit and how you will fund it. Extensions are granted in increments of up to six months. A timely filing generally protects you while the case is pending; a denial after your I-94 date means unlawful presence starts accruing.
• Border runs do not launder a long stay. Leaving for a short trip and returning gives the officer a fresh chance to refuse you. A visitor who spent six months in, three weeks out, and seeks another six months should expect hard questions.
• Change of status to student or work categories is possible in principle from B status, but requires its own timely filing and has strict rules; overstaying while "planning to adjust" is not a strategy.
• Canada, Mexico, and adjacent islands: unlike the Visa Waiver Program's balance-of-stay rule, B visitors get their admission period from the officer at each entry; do not assume a quick hop resets or pauses anything without checking the new I-94.

Overstays: consequences and enforcement

Overstaying a B1/B2 admission voids your visa automatically and starts the unlawful presence clock, and both facts are captured electronically. CBP builds your I-94 arrival and departure history from carrier manifests and border crossings, so the government knows your exit date without a single stamp.

The consequences stack:

• Visa void: under INA 222(g) (8 U.S.C. 1202(g)), staying past your authorized period voids the visa the moment the stay ends, and future visa applications must generally be filed in your country of nationality.
• 3-year bar: more than 180 days of unlawful presence followed by departure makes you inadmissible for three years (8 U.S.C. 1182(a)(9)(B)).
• 10-year bar: one year or more of unlawful presence triggers a ten-year bar on the same basis.
• Credibility damage: even a short overstay appears in your record at every future visa interview and admission, and shifts every close call against you.

Staying compliant

Compliance is knowing one date and respecting two clocks:

• Retrieve your I-94 within days of arrival and treat its date as immovable. iReside's US B1/B2 Visitor preset tracks your stay against the admitted period and warns you as the date approaches.
• File any I-539 extension well before expiry, with honest evidence; do not wait for the final week.
• Keep your center of life visibly abroad: a home, a job or business, and family ties outside the US are what make the "temporary visit" premise credible on your next entry.
• Watch cumulative presence for tax purposes. Six months per year, every year, makes you a US tax resident under the Substantial Presence Test even with flawless immigration compliance.
• Keep exit evidence (boarding passes, foreign entry stamps) in case a manifest mismatch ever needs correcting.

Common mistakes

• Reading the visa expiration as the stay limit. The I-94 date controls; the visa only governs entries.
• Never checking the I-94. Assuming "six months" when the officer granted three turns a lawful trip into an overstay.
• Filing for an extension after the I-94 date. Late filings usually mean the unlawful presence clock is already running.
• Using back-to-back visits as de facto residence. The pattern is visible and is the classic reason B1/B2 holders get refused entry or have visas cancelled.
• Forgetting arrival and departure days count, both for the immigration stay and for the tax-day count.
• Ignoring the Substantial Presence Test. The immigration rule and the 183-weighted-day tax rule run on the same days but answer to different agencies.