USA Which state do you pay the capital gains tax in if you move?

[joe8080]

Hello,

I am looking to move to a new state. If I sell stocks with capital gains taxes, which state do you pay the capital gains tax:
1) the state you lived in at the time you sold the stock for a gain
2) the state you moved to and subsequently lived in for most of the year

I'm not sure if I sell some stock now and then move in the beginning of February, do I pay the tax in the new state or the old state?

Thank you.

P.S. This is in the USA

 

[Drmdcpa]

The state of residence at time of sale