It depends on the value of the house and the overall estate. When you inherit a main-residence property from your parents, there is an additional IHT threshold to the £325,000. This extra threshold, which is linked to the property, is currently £175,000. Again this can be passed onto a spouse or civil partner, meaning up to £1 million could be passed down by a married couple with property. The main residence threshold does, however, reduce by £1 for every £2 that the deceased’s net estate exceeds £2 million.