<prompt> Human: In the beginning of middle of 2017 I changed jobs so that leaves me with two w2s. Is it smart to use two different tax services to process the refunds, I was thinking of using turbotax for my most recent job and Credit karma for the old. The old job took place in CT and the new job is in NY, not sure if its relevant but I think I am paying NY taxes as well as CT.Assistant: No, all of your income must be reported together on the same federal tax return.Human: So can you explain to me when I tried to process both tax refunds on HR Block it came out less than when I just tried to process one the new job almost 1400 less when I do both at the same time.  <response>: uwijwijwij explains it well here: 