I am plodding my way through the IHT paperwork for my mother. My understanding, confirmed by the IHT helpline, is that I have an allowance of £650,000 (£325,000 for each parent; my Dad died in 1999 and his IHT allowance rolled over), plus £175,000 for each parent for the house.
Bank accounts total £310,000 and house valued at £495,000. I’ve filled in all of the forms and get a different number every time when I put it into the IHT calculator (and I have to put this figure on the form). I can’t find anywhere on the calculator that I can account for the allowance from my Dad. What am I doing wrong?