Is your friend tax resident here or is you friend in the UK? If they are in the UK then it falls outside of the estate for inheritance tax (for now - this is the change that was announced recently but hasn't come into effect yet). If they are here then Irish CAT is due by the receiver of the inheritance. It's CAT tax group B thats due - ie 33% on everything over 40k (presuming they haven't used any group B banding before)