Share your insights or perspective on the financial matter presented in the input.

Currently sole owner of a property. My girlfriend is looking to move in with me and is offering to pay 'rent'. Am I at risk here?
I have been renting rooms out of my house for over 7 years now.  When renting to non-family, the arrangement is usually successful.  People leave for various reasons, an occasionally I will ask someone to move out if they are not working out.  In the USA, this works well because by keeping things formal (rental agreements, etc) you actually have a great business with lots of deductions that end up reducing you net income quite a bit. However, US law makes a big distinction about whether or not you're renting to family/relatives, specifically around whether or not they are paying full-market rent for their room.  If not, then you are subsidizing them which could disqualify your property (or at least the portion they are using) from being legitimately rented -- and thus no tax deductions for said activity. The other risk, -- again, in the USA -- is the possibility of a long-term relationship falling under rules of common-law marriage.  This is rare unless children are involved.  A couple who have children, married or not, may have the courts get involved to oversee the division of assets with regards to ensuring the children have a place to live and adequate financial support. For the UK, I would think the laws would be roughly similar.  Check out this website for more a detailed review.  https://www.citizensadvice.org.uk/family/living-together-marriage-and-civil-partnership/living-together-and-marriage-legal-differences/