inspecting CBP officer might allow a one year admission, or might instead offer the usual six month admission. While in B-2 classification, that domestic partner will not be able to work for a U.S. company in the U.S. or study in the U.S. Study instead could be undertaken by changing classification to one allowing study. Mexican citizens in the United States Unless already physically present in the United States and maintaining lawful status in a different classification (and thus potentially eligible for a "Change of Status" procedure to TN classification), a Mexican citizen must first obtain a U.S. TN-2 visa at an American consulate (typically in Mexico). Once the TN visa foil is affixed to the Mexican citizen's passport, he or she may seek admission into the U.S. in TN status in a similar manner to a Canadian citizen. In fiscal years 2007 through 2009, between 4,000 and 5,000 TN visas (including TN-2 visas for Mexicans) were issued by U.S. consulates each year. Prior to 2004, Mexicans were subject to an annual quota and to procedures similar to an H-1B visa. Extension options Renewal/extension of TN status can be done either by mail (which requires filing of Form I-129, "Petition for a Nonimmigrant Worker", by the employer, along with proof of the TN holder's citizenship and education, and an extension letter similar to the original offer letter) or by duplication of the original process (for Mexican citizens, a trip to a U.S. consulate; for Canadians leaving and re-entering U.S., document requirements are similar to those for obtaining the original TN). TN holders (and any dependents) are not required to leave the U.S. as soon as the TN status expires or the job is terminated; there is a formal grace period of 10 days at end of authorization to "depart the United States or take other actions to extend, change, or otherwise maintain lawful status" and a grace period of up to 60 consecutive days during each authorized validity period for certain high-skilled nonimmigrant workers when their employment ends before the end of their authorized validity period, so they may more readily pursue new employment and an extension of their nonimmigrant status. The individual is legally allowed to remain in the USA to look for another job for 60 days. Income tax requirements Canadian TN status workers are responsible for U.S. Medicare, state, federal, and Social Security taxes in the U.S.