Thanks DMarkM1 for the extremely detailed answer! I really appreciate your kind help! I think I was able to understand it much better and had some follow-up questions:
I found out that in my case, the two states A and B do have a reciprocal agreement and that I believe I should file as "Part-Year Resident" for both states. Does having a reciprocal agreement make the calculations a lot easier if I understand correctly? Basically I will just allocate any income from Job B to State A before the date of my relocation, and allocate the remainder of my income from Job B to State B?
In terms of allocating the income of my Job B between the two states, should I prorate my total income from Job B according to the number of calendar days while a resident of each state, or should I do it according to the paycheck date (whether each paycheck is before or after my relocation)? Since my Job B had a sign-on bonus and a relocation allowance, how to the allocation can make a difference.
