My partner owns a house outright, which was a gift from his parents a couple of years ago. We would like to have my name on the deeds, however, we know that adding me to the deeds would trigger a CAT liability. I am wondering if it would be possible for me to secure a mortgage to buy into the house - do banks allow this type of thing? I pay rent anyway, and a mortgage would be a similar sum. It would also give my partner some equity to spend on the house. Does anyone know if this is something that a bank would allow?