If the second person is actually in reality contributing towards the purchase of the house (e.g. the mortgage repayments) then all the contractual gymnastics in the world with regard to the mortgage/property deeds will not circumvent the tax issues that arise. There are many existing threads on this issue including posts from people who swear blind that there are ways around certain tax liabilities when there are, in fact, not. Be careful. Get independent, professional advice to avoid making a costly mistake.