Yes, you can challenge a probate property valuation. Executors, beneficiaries and HMRC all have the right to dispute a valuation in defined circumstances. The key is whether the figure accurately reflects the open market value at the date of death, as required for Inheritance Tax purposes in England and Wales.
If you are unsure about the basis of the original figure, understanding how challenges work can help you decide your next step.
Why probate valuations are sometimes disputed
A probate valuation must reflect the property’s open market value at the date of death. Open market value is defined by the RICS Red Book, the professional standards issued by the Royal Institution of Chartered Surveyors, as the price that would be achieved between a willing buyer and seller in an arm’s length transaction on the valuation date.
Disputes tend to arise for several reasons:
- An estate agent’s informal estimate was used rather than an independent RICS valuation
- The valuation date fell at a particularly weak or volatile point in the market
- The property’s condition at the date of death was not properly evidenced
- A second opinion produces a materially different figure
- HMRC opens an enquiry into the Inheritance Tax return
In many cases, the disagreement is not about principle but about evidence.
Who has the right to challenge a probate valuation?
Three groups may challenge a probate valuation, each for different reasons.
Executors
Executors are legally responsible for administering the estate and submitting the Inheritance Tax return. If they are concerned that a valuation may not withstand scrutiny, they can seek a second opinion.
Executors have a duty to take reasonable steps to establish the correct value. If they later discover that the figure was unreliable, they are entitled to revisit it.
Beneficiaries
Beneficiaries can question a probate valuation if they believe it materially misstates the value of the estate.
If the valuation is too low, it may expose the estate to HMRC challenge and potential penalties, which ultimately affect the beneficiaries. If it is too high, unnecessary Inheritance Tax may have been paid, reducing their entitlement.
Beneficiaries do not submit the tax return themselves, but they can request evidence of how the valuation was reached and may seek an independent assessment.
HMRC
HMRC (His Majesty’s Revenue and Customs) has statutory powers to investigate Inheritance Tax returns. This includes reviewing property valuations.
HMRC can and does open enquiries, particularly on higher-value estates or where figures appear inconsistent with comparable sales evidence at the date of death.
What grounds can you use to challenge a probate valuation?
A probate valuation is not challenged simply because someone disagrees with it. There must be reasonable grounds.
Common grounds include:
The valuation was too low
This is the most serious scenario. If a property was undervalued, the estate may have underpaid Inheritance Tax. Interest accrues on any shortfall and penalties may apply.
Undervaluation often arises where an estate agent’s marketing estimate was used without formal evidence or where comparable sales were not properly analysed.
The valuation was too high
Overvaluation is less discussed but equally significant. If the estate has overpaid Inheritance Tax, beneficiaries may have lost funds unnecessarily.
Correcting an overvaluation may allow the estate to reclaim tax, subject to HMRC’s rules and time limits.
The wrong method or an unqualified valuer was used
A probate valuation should be prepared in accordance with the RICS Valuation Global Standards, known as the Red Book. If the original valuation was informal, lacked reasoning or was not prepared by a suitably qualified professional, it may be open to challenge.
Comparable evidence was not properly applied
Valuation is evidence-based. If relevant sales at the date of death were overlooked or misinterpreted, the conclusion may not be defensible.
How to challenge a probate property valuation: step by step
Challenging a probate valuation should be approached methodically.
Step 1: Gather evidence
Collect:
- Details of the property’s condition at the date of death
- Any photographs, inventories or schedules of disrepair
- Copies of the original valuation or estate agent estimate
- Information on comparable sales around the valuation date
The valuation must reflect the property as it stood on the date of death, not its condition today.
Step 2: Commission an independent RICS Red Book valuation
The most credible way to challenge or defend a probate valuation is to obtain an independent RICS Red Book valuation at the date of death.
A Red Book valuation complies with professional standards, states the basis of value clearly and provides supporting reasoning and comparable evidence. In any probate valuation dispute, this is the most defensible form of evidence.
Details of our RICS probate valuation service explain how this is prepared.
Step 3: Submit or negotiate
If HMRC has opened an enquiry, the revised valuation is usually submitted through the estate’s solicitor or accountant. HMRC’s Valuation Office Agency may review the evidence and enter into negotiation.
If the dispute is between beneficiaries and executors, it may need to be resolved through the estate administration process. In more serious cases, formal proceedings may follow and an independent surveyor’s report may be relied upon as expert evidence.
| Step | Action | Who is responsible |
|---|---|---|
| 1 | Gather evidence of condition and comparable sales at the date of death | Executor or adviser |
| 2 | Commission independent RICS Red Book valuation | Executor or beneficiaries |
| 3 | Submit revised valuation or negotiate with HMRC or other parties | Solicitor, accountant or executor |
What happens if HMRC disputes the probate valuation?
If HMRC considers that a property was undervalued, it can open a formal enquiry into the Inheritance Tax return.
HMRC may:
- Request further information about the property and valuation method
- Refer the matter to the Valuation Office Agency
- Propose a revised figure
If HMRC concludes that the property was undervalued, it will issue an amended assessment. Interest will apply to any additional Inheritance Tax due and penalties may be considered depending on the circumstances.
The strongest defence is a properly prepared independent RICS Red Book valuation demonstrating that the original figure was a reasonable reflection of open market value at the date of death.
How long do you have to challenge a probate valuation?
In standard cases, HMRC can open an enquiry within four years of the Inheritance Tax return being submitted. Longer periods may apply in cases involving suspected negligence or deliberate misstatement.
Between executors and beneficiaries, the timeframe is influenced by the progress of estate administration. Delays can complicate matters, particularly once assets have been distributed.
Acting promptly reduces uncertainty and limits potential exposure to interest or penalties.
Can an executor be held liable for an incorrect probate valuation?
Yes, an executor can face personal liability if they fail to take reasonable care in valuing the estate.
Executors have a legal duty to administer the estate properly. If they knowingly accept an undervaluation, ignore clear evidence or fail to obtain appropriate professional advice, they may be liable for any resulting tax shortfall.
Instructing a RICS-qualified surveyor to provide a Red Book valuation is strong evidence that the executor took reasonable steps to establish market value. It demonstrates due diligence and reduces personal risk.
Does HMRC check probate valuations?
HMRC does not investigate every estate, but it does review Inheritance Tax returns and may raise queries where figures appear inconsistent with market evidence.
Higher-value residential properties and estates close to tax thresholds are more likely to receive scrutiny. Discrepancies between declared values and known sale prices in the same area can also trigger enquiries.
What is a Red Book valuation and why does it matter?
The RICS Valuation Global Standards, commonly referred to as the Red Book, set out mandatory rules and guidance for professional valuations.
A Red Book valuation:
- Defines the basis of value
- States the valuation date clearly
- Explains assumptions and limitations
- Provides reasoning and comparable evidence
- Is prepared by a qualified RICS surveyor, often a Registered Valuer
In a probate dispute, this format carries professional weight. It provides structured, defensible evidence rather than opinion alone.
The cost of getting a probate valuation wrong
The financial consequences of an incorrect probate valuation can be significant.
If the estate underpays Inheritance Tax, interest accrues from the due date and penalties may apply. These costs reduce the estate available for distribution.
If the estate overpays, beneficiaries may lose funds that were rightfully theirs, at least until a successful reclaim is made.
Against the value of most residential estates in Surrey and the South East, the cost of obtaining a properly prepared independent valuation is proportionate to the potential risk.
Where matters escalate to formal dispute, a surveyor may also be instructed to provide expert witness reports suitable for court or tribunal proceedings.
For background on what a probate valuation involves and the wider HMRC requirements for probate valuations, our earlier articles explain the underlying framework.
If you are dealing with a probate valuation dispute, or wish to ensure that the figure used for Inheritance Tax purposes is defensible, discuss a probate valuation with Brian Gale Surveyors. Independent RICS valuations are prepared in accordance with the Red Book and can be relied upon in discussions with HMRC or, where necessary, in formal proceedings.
Frequently asked questions
- Can you dispute a probate valuation?
Yes. Executors, beneficiaries and HMRC can dispute a probate valuation if there are reasonable grounds to believe it does not reflect open market value at the date of death.
- Can beneficiaries challenge a probate valuation?
Beneficiaries can question and seek evidence for the valuation used. If they believe it is materially inaccurate, they may request an independent RICS valuation and pursue resolution through the estate administration process.
- How do you get a second opinion on a probate valuation?
Instruct an independent RICS-qualified surveyor to prepare a Red Book valuation at the date of death. This provides structured evidence that can support or challenge the original figure.
- How long do I have to challenge a probate valuation?
HMRC can usually open an enquiry within four years of the Inheritance Tax return being submitted. Executors and beneficiaries should raise concerns as early as possible during estate administration.
