If your partner's father does not live in the property once he has transferred it to your partner and is a straightforward gift with 'no strings attached' (e.g. there is no condition that your partner will financially support his father by, for instance, paying for his rent/mortgage on a new property) then, on the face of it at least, the transfer could successfully mitigate IHT liability. The gift will be treated as a Potentially Exempt Transfer (PET), which means that if the father dies within seven years from the date of the gift, IHT will be payable, though on a sliding scale basis. I can't recall the precise scale off the top of my head, but for instance, if the father died within 5 years of making the gift, then 40% of the full IHT liability would be payable. If you want to buy the property for a 'nominal sum', as the transaction won't be 'at arms length', this has risks. If the father is going to live in the property with your partner and you, whether the 'GROB' rules bite ('gifts with reservation of benefit'), depends on the circumstances. There are new rules on IHT planning, which cover the gifting of one's main residence among other things, which come into effect April 2005 and are aimed at cracking down on the various IHT mitigation loopholes and will be retrospective in many cases covering agreements going back to 1986. The best advice anyone on this site can give you is that you must seek professional legal and tax planning advice. It is far better to spend �2,000 or so now getting proper advice and having the proper agreements drawn up than finding yourselves landed with a IHT bill for tens of thousands of pounds in the future.