dyslexicme. Try to think this through in the cold light of day. How come your friend is on such a low income that he needs tax credits. At 51 shouldn't he be working at a proper job that provides him with a proper living wage, or does he have other vulnerabilities that you haven't mentioned, (i.e why do you feel you would be taking him 'under your wing'). As for if you should split up in the future, he would be no worse off than he is at present. He would still have, presumably, the same income that he has now, and would be able to rent again. Next - on such a low income what would he be able to contribute to the upkeep and running of a joint household, not much I imagine. The main contributor would always be you. Looking further down the line, say 15 years, you will be 57, and he will be 66 and living on what is likely to be basic government pension. Whereas, you will still be working and supporting two mortgages. Not to be unkind, but you also need to consider his general health, in view of the age difference, as it would be very hard to care for a retired person in ill health, and still carry on working. Also does he have any family who would step in to help in such a scenario. Or if he is a bachelor that is also something to be wary of. Sorry to sound so pessimistic, but there are so many variables that you really do need to think very carefully before committing yourself to this man. As a previous poster commented 'love flies out the window when poverty comes in the door', it may not be a poverty situation as such, but speaking from experience, resentment can build up when one person in a relationship is carrying the total financial burden. Having said all that I wish you the best in whatever you decide to do.