Go to 'My IG' you'll see your accounts listed. To the right of the profit/loss column click on the three horizontal dots and there is a transfer funds option in the drop down.
You can do this if the funds have settled. Are you just trying to transfer cash or are you closing positions to then rebuy in the ISA? I recently tried to do the this but was concerned about it taking too long so looked into a Bed & ISA. Unfortunately the Bed & ISA transaction isn't allowed on US markets.
Move cash from my stocks a/c into my ISA?
in New Client Trading Questions
Posted
You can do this if the funds have settled. Are you just trying to transfer cash or are you closing positions to then rebuy in the ISA? I recently tried to do the this but was concerned about it taking too long so looked into a Bed & ISA. Unfortunately the Bed & ISA transaction isn't allowed on US markets.