An alien having been lawfully admitted in nonimmigrant status, has overstayed by even one day the initial period of authorized stay, may no longer use the visa with which an alien entered the U.S. and may not be eligible for further issuance except in the country of alien's nationality. The important document to determine the period of authorized stay is I-94, but not the visa stamped in the Passport. VISA is valid only for entering U.S. The date on the form I-94 is controlling on how long you may remain (stay) in U.S. H-1B employees are advised to check your I-94 and also of each of your dependents. Contact your employer or your attorney prior to the expiry of your I-94 for filing extension of your stay. Any alien overstays for 180 days beyond their expiry of I-94 are ineligible to get a visa and hence inadmissible for 3 years after their departure, 10 years if they overstay 1 year.