H1B transfer , start date question?

[shaa]

Hello,

While changing job using H1B transfer, Does one have to leave employer A just a day before the first day of new H1B start date for EMPLYER B?

or

when does the current H1B expire (employer A) during H1B transfer process?

I understand that one can not receive 2 pay stubs if the h1b filing is not concurrent but whts the rule for end date for job A and start date for job B? does it have to be back to back?

or

is it like , current h1b wont expire untill one acutally starts working at job B with new H1B?

I would appreciate your response.

Thank you.

[Attorney_11]

Generally, when preparing a change of employer petition, one should attempt to match the starting date of the validity of the change of employer petition with the first date of employment. However, individual circumstances can be different. It may be helpful to discuss this with an immigration attorney.