Sevenoaks House Clearance Probate Services. The purpose of a probate valuation is to ascertain the total value of the assets held in the estate. There are a number of reasons why this is important In the first instance, if it has not been previously worked out, a probate valuation will show whether or not Inheritance Tax (IHT) will be payable on the estate and, if so, how much will be charged. This can be hugely important as it may have a significant impact on the eventual sums passed to beneficiaries