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Is it necessary to pay tax if someone lends me money to put into my mortgage?
This answer is specifically for the UK, but one building society has an account set up specifically for this. You actually refer your friend/family member to set up an account and then it can be linked to your mortgage. They don't get any interest for their account as it's all offset against your mortgage. If you then happen to give them a cash gift (up to £250 or possibly £3000 per year, I can't work out which is the reliable number, as of 2015) then it's all completely above board.