When a person dies owning a property, the value of that property must be assessed for inclusion in the probate application and the inheritance tax calculation. The question of how formally this valuation needs to be done, and whether an official surveyor's report is mandatory, depends on the circumstances of the estate and the complexity of the property valuation.

What Valuation Is Required

For probate purposes, the property must be valued at its open market value at the date of death. The open market value is defined as the price the property might reasonably be expected to fetch if sold on the open market on the date of death, with both buyer and seller acting in an informed and willing way.

For simple estates below the inheritance tax threshold and where the property is a straightforward residential property of normal type, an estate agent's valuation may be sufficient to establish the probate value. A reputable local estate agent who can demonstrate local market knowledge and who provides a written valuation with supporting reasoning is generally acceptable for these purposes.

For larger estates that are subject to inheritance tax, where the property's value is material to the inheritance tax calculation, HMRC's Valuation Office Agency may check the value declared and challenge it if it appears to be understated. In these cases, a formal RICS Red Book valuation from a chartered surveyor carries more weight and provides a stronger defence against any HMRC challenge.

HMRC and the Valuation Office Agency

After a Grant of Probate is issued and inheritance tax is paid on an estate, HMRC's Valuation Office Agency may review the property valuations declared in the inheritance tax account. If the VOA considers a property to have been undervalued, they will open an enquiry and seek to negotiate a higher agreed value, which increases the inheritance tax payable and may attract interest on any underpayment.

Providing a well-evidenced valuation at the outset, supported by comparable sales evidence from the local market at the date of death, reduces the risk of a successful VOA challenge. A formal RICS valuation prepared specifically for probate purposes includes this evidence and is prepared to the standard required for use in legal and tax proceedings.

Unusual or Complex Properties

For properties that are difficult to value, such as unusual rural properties, listed buildings, properties with development potential, properties with significant defects, or commercial properties, a formal valuation from a specialist chartered surveyor is particularly important. Estate agents may not have the expertise to value these accurately, and HMRC is more likely to scrutinise values declared for atypical properties.

Correcting an Inaccurate Valuation

If a property is subsequently sold for significantly more than the probate valuation, HMRC may use this as evidence that the property was undervalued at death. The difference between the probate value and the sale price is not automatically treated as a capital gain, but a large discrepancy invites scrutiny. Having a well-evidenced valuation that reflects the market conditions at the date of death, rather than a figure designed to minimise tax, is both legally correct and practically the safest approach.

Summary

A property must be valued at its open market value at the date of death for probate and inheritance tax purposes. An estate agent's valuation may be acceptable for smaller, simpler estates below the inheritance tax threshold, but for larger estates and properties subject to inheritance tax, a formal RICS valuation provides stronger protection against HMRC challenge. Unusual or complex properties should always have a formal professional valuation regardless of the estate size.