So many times a client will come to the office and ask for an extension to stay longer in the United States. Many times we will determine that the client is already out of status, and an extension can not be filed. When I inform the client of the news, the reaction is often one of shock, how can that be, my visa is good for 5 years???
There is a common misconception that a U.S. visa is the evidence of your lawful status in the United States. Many individuals have difficulty understanding the difference between the visa expiration date and the length of time you have permission to remain in the U.S. These are very different terms.
A visa must be valid at the time a traveler seeks admission to the U.S., but the expiration date of the visa has no relation to the length of time a temporary visitor may be authorized by the Department of Homeland Security to remain in the United States.
Visa Lawyer Blog

