Probate Valuation London 2026: What Executors Need to Know Before They Instruct Anyone
When someone dies and leaves property as part of their estate, one of the first practical tasks falls to the executor: establishing what that property is worth. Get this right and the probate process moves forward cleanly. Get it wrong, and you are personally exposed to HMRC penalties that can match or exceed the tax liability itself.
This guide covers what a probate valuation actually involves, what HMRC expects, why an estate agent’s estimate is not enough, and what the consequences look like when the figure submitted turns out to be too low.
What Is a Probate Valuation?
A probate valuation is a formal assessment of a property’s open market value at the date of death. This figure is submitted to HMRC as part of the inheritance tax calculation for the estate.
The legal definition comes from Section 160 of the Inheritance Tax Act 1984. Property must be valued at the price it “might reasonably be expected to fetch if sold in the open market” at the time of death. That is a specific legal standard, and it is the one HMRC applies when they review the figures.
The valuation date is the date of death, not the date the valuation is actually carried out. This distinction matters if the market has moved in the time between the death and when you instruct a surveyor.
Does Every Estate Need a Formal RICS Valuation?
Not every estate requires a full RICS valuation. For smaller estates below the inheritance tax threshold, simpler methods are sometimes acceptable. But for any estate where property is a significant asset and IHT may be in play, an independent RICS valuation is strongly advisable.
The standard nil-rate band for 2026/27 is £325,000. It has been frozen at this level since April 2009 and is confirmed frozen until at least April 2030 under the Finance Act 2025. The residence nil-rate band adds a further £175,000 where the property is passing to direct descendants.
Given where London property prices sit in 2026, the vast majority of estates involving a residential property will breach these thresholds. A single-bedroom flat in most London boroughs will be enough to push a modest estate into IHT territory.
What Is the Inheritance Tax Rate in 2026?
IHT is charged at 40% on the portion of the estate above the available threshold. For a single person leaving a £700,000 London property with no other significant assets, the calculation looks like this:
- Estate value: £700,000
- Nil-rate band: £325,000
- Residence nil-rate band (if property passing to children): £175,000
- Taxable above threshold: £700,000 minus £500,000 = £200,000
- IHT at 40%: £80,000
At those numbers, a £50,000 undervaluation saves roughly £20,000 in tax on the face of it. But if HMRC challenges the figure and it is found to be inaccurate, the penalty can be up to 100% of the additional tax due — meaning the same £50,000 undervaluation could cost the estate £40,000 in total: £20,000 in unpaid tax plus up to £20,000 in penalties.
Can Executors Use an Estate Agent's Valuation?
An estate agent’s opinion of value is not the same as a RICS valuation, and it does not meet the standard HMRC expects for contested or high-value estates.
The STEP UK Practice Committee, which advises solicitors on estate administration, has confirmed through direct correspondence with HMRC that there can be no assurance a selling agent’s estimate will be sufficient, and that undervaluations based on such estimates carry a real risk of penalty.
HMRC has direct access to the District Valuer Service (DVS), the Valuation Office Agency’s specialist arm. When they suspect a property has been undervalued, the DVS is instructed to carry out its own assessment. If that assessment comes back higher, HMRC will pursue the difference in tax and potentially a penalty on top.
An independent RICS valuation is the clearest way to demonstrate that reasonable care was taken. Courts and HMRC have consistently treated RICS-qualified valuations as evidence of appropriate diligence.
What Are the Risks of Getting the Valuation Wrong?
Executors are personally liable for the accuracy of the estate figures submitted to HMRC. The penalties scale with the nature of the error:
- Careless undervaluation: penalty of up to 30% of the additional tax due
- Deliberate undervaluation: penalty of up to 70% of the additional tax due
- Deliberate and concealed undervaluation: penalty of up to 100% of the additional tax due
These are in addition to the unpaid tax itself at 40%. HMRC carries out thousands of estate valuation investigations annually and cross-references Land Registry data. If a property sells for significantly more than the probate figure shortly after death, that will typically trigger a review.
What Does a RICS Probate Valuation Involve?
A RICS Red Book valuation for probate is a formal inspection carried out by an MRICS or FRICS qualified valuer. The surveyor will:
- Inspect the property in its condition as at the date of death
- Review comparable sales evidence from the local market around the same date
- Assess any factors that affect value — condition, tenure, planning, local market conditions
- Produce a formal written report stating the open market value as at the date of death
The report is produced to RICS Red Book standards. It is legally recognised by HMRC, solicitors, and probate registries. For London properties, the surveyor should have direct knowledge of the relevant local market at the relevant time.
What Happens If the Property Sells for More Than the Probate Value?
This is a common situation and it does not automatically trigger a penalty. Property markets move. A property sold several months after the date of death may achieve a higher price than the open market value at the date of death, and that is entirely legitimate.
The key question HMRC asks is whether the valuation at the date of death was accurate. If a RICS-qualified valuer assessed the property properly and used appropriate comparable evidence, the fact that it later sold for more is unlikely to result in a penalty.
If property is sold for less than the probate value within four years of the date of death, executors can apply to HMRC for a refund of overpaid IHT. The same relief applies to land sold within three years.
Related Blogs
- Help to Buy Valuation in 2026: What You Owe and Why the Valuation Matters
- Harrow Hive FC Win the Kane Cup — and We Couldn't Be Prouder
- Probate Valuation London 2026: What Executors Need to Know Before They Instruct Anyone
- Choosing a Surveyor in London: What to Ask, What to Avoid, and What a Level 2 Cannot Tell You
FREQUENTLY ASKED QUESTION
Frequently Asked Questions
Do I need a probate valuation if the estate is below the IHT threshold?
Can the executor be personally liable for an incorrect probate valuation?
What is the difference between a probate valuation and a market appraisal?
How does HMRC check whether the probate valuation is accurate?
Does the property need to be empty before a probate valuation?
Need a surveyor? Get in touch
What Happens After Your Offer Is Accepted — and Why Most Buyers Get the Next Step Wrong
Getting your offer accepted feels like the biggest hurdle, and in many ways it is. But in the buying a house process UK 2026, the
Leasehold, Freehold, Share of Freehold and Commonhold: A Complete Guide for London Buyers in 2026
If you are buying a property in London, the type of ownership you are buying matters as much as the property itself. Most buyers understand
Choosing a Surveyor in London: What to Ask, What to Avoid, and What a Level 2 Cannot Tell You
Most buyers book a survey the same way they book a cab. Find the first option, check the price, confirm it. Job done. That works
Probate Valuation London 2026: What Executors Need to Know Before They Instruct Anyone
When someone dies and leaves property as part of their estate, one of the first practical tasks falls to the executor: establishing what that property
Help to Buy Valuation in 2026: What You Owe and Why the Valuation Matters
If you bought your home through the Help to Buy equity loan scheme and you are approaching year five, or you have already hit year
Harrow Hive FC Win the Kane Cup — and We Couldn’t Be Prouder
Harrow Hive FC have won the Kane Cup, beating their opponents 4-1 in what turned out to be a thoroughly deserved victory. As the club’s