What Does a Capital Gains Tax Valuation Involve?

What a capital gains tax valuation is

A capital gains tax valuation is a formal opinion of a property's market value at a set date. It is used to work out the gain on an asset for tax purposes.

Capital gains tax is charged on the increase in value between the point you acquired a property and the point you disposed of it. When both figures come from a normal sale on the open market, the price does the work for you. The problem arises when there is no clean sale price to rely on.

That is where a valuation is needed. It fills the gap with a defensible market value figure, prepared to a recognised standard.

This is different from a mortgage valuation or a survey. If you want the wider picture on what a formal valuation covers, our Complete Guide to RICS Valuations sets it out.

When HMRC expects a valuation

HMRC looks for a valuation whenever a property changes hands without a straightforward market sale, or where a past value needs to be established. Common situations include:

• Selling a second home or buy-to-let where you need the value at a particular acquisition date, for example when a property was first let or brought into a portfolio.
• Inherited property where you need the value at the date of death, and then again if you later sell.
• A gifted property, such as a parent transferring a house to a child. A gift is treated as a disposal at market value even though no money changed hands.
• Transfers between connected people at less than market value, where HMRC substitutes the market figure.
• Assets held on a specific historic date where legislation sets a rebasing point.

Chris Bloor, on site

A father wanted to gift a semi to his daughter, and asked me what figure went on the return. No money was changing hands, so there was no sale price to point to. The value question was simply this: what would it have fetched on the open market that week, between a willing buyer and seller. Not a fond figure between family. I looked at what similar homes on nearby streets had sold for, and set the market value at the date of the gift. That is the figure HMRC treats as the disposal, whatever the family agreed between themselves.

In each of these, the sale price either does not exist or does not reflect true market value. HMRC needs an independent figure it can test.

What an RICS surveyor assesses

The job is to establish market value at the relevant date. Market value is the price the property would reasonably have fetched, on the open market, between a willing buyer and a willing seller.

To reach that, an RICS surveyor considers:

• The property itself: its size, layout, condition, tenure and any features that add or reduce value.
• Its location: the street, the local area and the type of buyer it would attract.
• Comparable evidence: what similar properties nearby actually sold for around the valuation date.
• Market conditions at the date: prices move, and the figure must reflect the market as it stood then, not now.

Comparable evidence is the heart of the work. We explain how it is weighed in What is Comparable Evidence?.

Where a current valuation is needed, an inspection is usually carried out. For a retrospective figure, the surveyor works from records, plans, photographs and the evidence available for that earlier date.

Retrospective valuations

A retrospective valuation looks back to a past date: the date of death, the date of a gift or a legislated rebasing date. The surveyor is not asking what the property is worth today. They are reconstructing what it was worth then.

This takes care. The evidence has to come from around that date. Sold prices, market reports and any records of the property's condition at the time all feed into the opinion. Where the property has since been altered or extended, the surveyor values it as it stood at the valuation date, not as it stands now.

A retrospective valuation is more involved than a current one, because the surveyor is building a picture from historic material rather than a live inspection.

Chris Bloor, on site

For a past date I start with the sold prices around that time, then chase the plans, old listing photographs, anything that shows how the place stood back then. The further back you go, the thinner it gets. Records from twenty years ago can be a handful of sales on the same road and little else. Where a house has since been extended, I have to picture it without the extension, which the current photos will not show me. So the figure comes with a note of caution. It is a reasoned opinion built on what survived, not a price read off a receipt.

Current valuation or retrospective valuation

The two main types differ in the date they target and the evidence they draw on.

A single tax situation can need both. An inheritance might require the value at the date of death and then the value at sale, so you can see the gain across your period of ownership.

How a professional valuation supports your tax position

HMRC can and does challenge property values on tax returns. A figure plucked from an online estimate or a passing agent's remark carries little weight if questioned.

A valuation prepared by an RICS surveyor to Red Book standards is a different matter. It sets out the figure, the date it applies to, the comparable evidence behind it and the reasoning. That is what makes it defensible.

The benefits are practical:

• Accuracy: the gain is calculated from a properly reasoned figure, so you are not over-paying or under-declaring.
• A clear audit trail: the report shows how the value was reached, which is exactly what HMRC looks for.
• Credibility under scrutiny: if the District Valuer reviews the figure, a professional report gives you firm ground to stand on.

Where HMRC's own valuer disagrees, a properly evidenced report is the basis for a sensible discussion rather than a weak position.

Getting the timing right

Arrange the valuation as close to the relevant event as you can. For a gift or a current transfer, that means valuing at the time it happens. For an inheritance, the date of death value is fixed, but the sooner it is recorded the better, while evidence is fresh.

If you are unsure whether your situation needs a valuation at all, When to Arrange a Property Valuation may help. We would also recommend speaking to an accountant or tax adviser on the tax calculation itself: the surveyor provides the value, not the tax advice.

Frequently asked questions

Do I always need a valuation for capital gains tax?

No. If you sold on the open market at arm's length, the sale price is the figure HMRC uses. A valuation is needed where there is no genuine market price, such as a gift or a transfer between connected people, or where you need the value at a past date like the date of death.

Can a surveyor value a property for a date years ago?

Yes. This is a retrospective valuation. The surveyor works from sold prices and records from around that date, and values the property as it stood then. It takes more research than a current valuation, but it is standard work for an RICS valuer.

Will HMRC accept an estate agent's valuation?

An agent's appraisal is aimed at winning a sale, not at defending a tax figure. It rarely sets out comparable evidence or reasoning. An RICS valuation prepared to Red Book standards is far more likely to withstand a challenge from HMRC or the District Valuer.

What is the difference between a valuation and a survey?

A survey reports on the condition of a property. A valuation gives an opinion of its worth. For capital gains tax you need a valuation. Our guide Do I Need a Valuation or a Survey? explains where each one fits.