BB

Hi I hope I am writing this question in the same place - quite confused as to how this works. I'm changing broker from IG to T212, via partial transfer because some of my IG holdings T212 don't offer, so I will migrate all the stocks I can, and leave the rest on IG. However. From what I understand the rule is that you can only pay into one Stocks and Shares ISA per year So as much as I wouldn't be "paying into" my old one anymore, if i ended up cashing in on some of the stocks that I didn't migrate over, would I still benefit from the ISA tax relief? Or would I then be subject to the going CGT or whatever