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The US H-1B visa is a non-immigrant visa that allows US companies to employ graduate-level workers in specialty occupations that require theoretical or technical expertise in specialized fields such as in IT, finance, accounting, architecture, engineering, and other departments. 

Any professional level job that usually requires you to have a bachelor's degree or higher can come under the H-1B visa for specialty occupations. If you do not have a bachelor's degree or higher then you may be able to show degree equivalence through work experience and/or other qualifications.  

Applying for a non-immigrant visa is generally quicker than applying for a US Green Card, therefore the H-1B visa is popular for companies wishing to bring in staff for long-term assignments in the US.  However, because of the lack of available visas employers frequently have to look at applying for other visa categories such as the L-1B for specialized workers, L-1A for managers and executives, E-2 Treaty Investor visas, E-1 Treaty Trader visa, E-3 for Australians, etc.

H-1B visas are subject to an annual visa cap each financial year. US employers can begin applying for the H-1B visa six months before the actual start date of the visa. 

Current immigration law allows for a total of 85,000 new H-1B visas to be made available each government fiscal year. This number includes 65,000 new H-1B visas available for overseas workers in specialty (professional) level occupations with at least a bachelor's degree, with an additional 20,000 visas available for those specialty workers with an advanced degree from a US academic institution. In recent years the H-1B visa cap has been heavily oversubscribed near the beginning of April each year.