H1B visa transfer before October

Hi,

My employer is applying for my H1B visa in April 2016. Currently I am on OPT. If my VISA gets approved can I change my employer immediately(transfer my H1) or do I have to wait till October?

H-1B will become effective only from Oct 1 or later. So you cannot switch to H-1 before that.

Obviously, you have to wait till October if you want to get an H1b otherwise he may cancel your petition.

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