If you're in the U.S. on a temporary visa and your situation changes — you need more time, you got a job offer, you started school, you got married — you may be able to extend your current status or change to a different one without leaving the country. The key is filing the right form at the right time. Falling out of status, even by a day, can have lasting consequences.
Your visa stamp is just an entry document. Your authorized stay is the date on your I-94 record (electronic for most arrivals). That's the date USCIS cares about — and the date your application has to be filed before.
Visitors (B-1/B-2), students (F, M), exchange visitors (J), and visa dependents (H-4, L-2, etc.) generally use Form I-539 to extend or change status. Workers in their own employment-based status (H-1B, L-1, O-1) typically file through their employer with Form I-129.
If you file a timely, non-frivolous extension or change-of-status application before your I-94 expires, you can usually stay in the U.S. while it's pending. Filing late means you've fallen out of status, which can lead to denial and trigger unlawful presence.
If you're changing from B-2 to F-1, you can't start school full-time until the change is approved. Same with starting work on a new H-1B or L-1. Acting too early is treated as a status violation.
Accruing more than 180 days of unlawful presence and then leaving the U.S. triggers a 3-year bar on re-entry; more than a year triggers a 10-year bar. This is one of the harshest traps in immigration law and a big reason to act before your I-94 expires.
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NotALawyer.com provides general legal information, not legal advice.