Postby AnthonyR » Wed Nov 22, 2017 6:55 pm
As Maths says, if the property is under £650,000 there is no IHT liability on the property if it is paid out first. So nothing to do.
If it's more than £650,000 and you gift a share to the sister HMRC are likely to treat this as a gift with reservation (which is ineffective for IHT purposes) unless you pay full market rent for the share to your sister for a period of at least 7 years (which she would pay income tax on). She could move in with you and occupy 'her' share, which would avoid having to pay rent, but that may not be practical (or desirable).
Unfortunately the family home is an asset that's it's not usually very straightforward to deal with and while the new Residence Nil Rate Band addresses the issue for some families, it's not much help for those without children.