Here is my situation: - currently on F-1 visa, with a valid OPT until 11/30/2013 - approved H1B with my current employer A, starting 10/01/2013 I got a job offer from a company B and they want to start the H1B transfer asap. 1. Are there any issues if I transfer the H1B before October 1st? 2. When should I let my current employer know that I am joining another company? a) Now? b) After I get the receipt notice of the H1 filed by company B? c) After I get the approved H1B with company B? 3. If I am not going to inform employer A at this point about me joining company B, how do I get the experience letter from them? Is that something which is absolutely required for H1B transfer? All inputs are greatly appreciated.