Frequently Asked Questions - Could an independent Scotland be in the Common Travel Area and have different immigration policies?
Yes. Ireland currently operates a different immigration system to the UK and this has not affected the Common Travel Area agreement. For example, Ireland grants “green cards”, which the UK does not, and the UK has a points based system which Ireland does not. Far from hindering the Common Travel Area, the UK and Ireland issued a joint statement earlier this year committing to the development of a Common Travel Area visa.
Source: Scotland's Future, Scottish Government, November 2013.