Comparable Transactions Valuation: How Deal Multiples Value a UK Business

This guide is general information. It is not a formal valuation, financial advice or tax advice.

Comparable transactions valuation estimates what a business is worth from the prices paid for similar businesses in completed sales. You derive a multiple from each deal, usually enterprise value to earnings before interest, tax, depreciation and amortisation (EBITDA). You adjust it for differences, and apply it to your normalised earnings. The output is an enterprise value range.

It is the main technique within the market approach, which is one of three approaches set out in our guide on how to value a business. This page goes further on one question: how to build, adjust and defend a set of comparable deals so the multiple you apply stands up to a buyer, a lender or HMRC.

The method goes by several names. Investment banks call it precedent transactions analysis. US appraisers call it the guideline transaction method. Some advisers call it the transaction multiples method. This guide uses comparable transactions throughout.

What is comparable transactions valuation

Comparable transactions valuation prices your business by reference to what buyers have actually paid for similar businesses. It rests on the principle of substitution. An informed buyer will not pay much more for your company than for an equally attractive business that has recently changed hands.

Each comparable deal gives you a ratio between the price paid and a financial measure of the business acquired. For example, divide the enterprise value paid by the target’s EBITDA and you have an EV/EBITDA multiple. Enterprise value (EV) is the value of the whole operating business before debt and surplus cash. Equity value is what shareholders receive once debt is repaid, surplus cash is added and working capital is settled.

Most comparable deals involve a buyer taking control. Their multiples therefore already contain whatever control premium the buyer paid, which is the extra amount paid for the right to run the business. So the method produces a value for a controlling interest, on a debt-free cash-free basis, anchored to conditions at the dates of the deals you used. Everything after that is adjustment and judgement.

When the method works and when it does not

Comparable transactions valuation is reliable when three things are true: your business is established, profitable and owner-managed; you are valuing full ownership; and businesses like yours change hands regularly. In those conditions, prices actually paid are the most direct evidence of what a buyer will pay.

It weakens in four situations:

1. A niche activity with few genuine comparables, where you end up stretching the definition of similar.
2. A loss-making or erratic earnings record, where there is no stable base to apply a multiple to.
3. An asset-rich business, such as a property-holding or investment company, where the asset approach usually leads.
4. A minority shareholding, because multiples from control deals overstate what a non-controlling stake is worth.

Our position is simple. For an established, profitable business being prepared for sale, comparable transactions should be the primary method. For a fast-growing business, a turnaround or a minority interest, use it as a cross-check on an income-based valuation rather than as the anchor. The purpose of the valuation matters too, as we explain in our guide to valuing a business before selling.

Comparable transactions vs comparable company analysis

Both methods belong to the market approach, but they take their prices from different places. Comparable transactions use prices paid to acquire whole businesses. Comparable company analysis uses the share prices of listed companies, known as trading multiples.

Factor	Comparable transactions	Comparable company analysis
Price source	Completed acquisitions of whole businesses	Share prices of listed companies
Interest valued	Control, usually 100%	Minority, freely tradeable
Control premium	Already included in the multiple	Must be added for a control valuation
Marketability	Reflects a negotiated private sale	Reflects instant liquidity on an exchange
Timing	Historic, fixed at each deal date	Current, updated daily
Fit for UK owner-managed firms	High where sector deals exist	Low, because listed peers are far larger
Main weakness	Thin, lagging and partly disclosed data	Size and liquidity gap to private companies

For most owner-managed UK businesses, listed peers are so much larger and more liquid that the adjustments swamp the evidence. Use trading multiples to sense-check which direction a sector is moving in, not to set a price.

How to select comparable transactions

Selection drives the answer more than the arithmetic does. A carefully adjusted multiple from the wrong deals is still the wrong multiple.

Tax authorities apply the same discipline. The OECD Transfer Pricing Guidelines (2022 edition) test prices between connected companies. They state that comparability analysis should aim for the most reliable comparables, and that less comparable transactions should be eliminated.

Industry classification

Start with what the business does, not with what its code says. The Office for National Statistics (ONS) maintains the UK Standard Industrial Classification (UK SIC 2007). This is a five-digit framework, and companies declare their SIC codes on Companies House records.

Match comparables at the five-digit level where you can. Then check customer base, contract type and revenue model, because two companies under the same code can run very different businesses.

In July 2025 the ONS also launched the revision to create UK SIC 2026. Expect code mappings to shift, and record which version each comparable used.

Size

Size changes both risk and the buyer pool. A workable starting band is comparables with EBITDA between half and double yours. Widen the band only when the set is too thin, and adjust for the gap.

Geography

Prefer UK deals. Regional differences in labour costs, property costs and buyer appetite can move prices within the UK. Overseas deals also reflect different tax regimes and financing markets, so use them only as supporting evidence.

Date window

Start with deals from the 24 to 36 months before your valuation date. A deal struck when borrowing was cheaper or dearer than today is not the same evidence as one agreed last quarter. Adjust older deals or exclude them.

Deal type, stake and buyer

Keep only acquisitions of 100% or of clear control. Exclude the following, because none of them reflects an arm’s length price for control:

• minority stakes
• distressed sales
• sales to family or connected parties
• internal reorganisations

Record the buyer type as well. Trade buyers, private equity funds, individuals buying a job for themselves and management teams all price differently.

Asset sale vs share sale

In a share sale, the buyer acquires the company with its full history and liabilities. In a trade and asset sale, the buyer selects assets and usually leaves liabilities behind, often along with debtors and creditors.

The headline prices of the two deal types are not directly comparable. Restate each deal to the same scope, which is usually the enterprise value of the trading business including a normal level of working capital.

A comparability scoring approach

Score each candidate deal from 0 to 2 against seven factors. This makes your judgement visible, so you can show a buyer’s adviser or HMRC exactly why each deal is in or out.

Factor	2 points	1 point	0 points
Activity	Same five-digit SIC and customer base	Same SIC class, different customer mix	Adjacent activity only
Size	EBITDA within half to double yours	Within a quarter to four times yours	Outside that band
Geography	Same region or same national footprint	Elsewhere in the UK	Outside the UK
Date	Within 24 months	24 to 36 months	Older than 36 months
Stake	100% acquired	Control short of 100%	Minority
Disclosure	Full consideration terms known	Headline known, terms partly known	Headline only
Buyer type	Same type as your likely buyer	Different but rational buyer	Special purchaser or connected party

Include deals that score 9 or more out of 14. Then weight the included deals by their score, so the closest comparables carry the most influence.

Where comparable transaction data comes from

UK private company deal data is thin, partial and largely private. Know what each source can and cannot tell you before you rely on it.

Companies House filings

Companies House filings help you date a deal, confirm net assets and identify secured debt. The relevant records are accounts, confirmation statements, charges and changes in persons with significant control.

These filings often do not show earnings. As Companies House set out in its 2023 guidance on small company filing options, a small or micro company that prepares full or abridged accounts does not have to file its profit and loss account.

In June 2026, Companies House confirmed accounts filing changes from April 2028. From that date, small companies and micro-entities must file profit and loss accounts. However, they can opt out of publishing them on the public register. For you, this means the EBITDA of many small comparable targets will stay off the public record even after 2028.

Official statistics

The ONS mergers and acquisitions bulletin for April to June 2026 was released on 1 September 2026. It counted 353 mergers and acquisitions involving a change in majority share ownership in that quarter, against 407 in January to March 2026.

The series covers only transactions worth £1 million or more. The ONS describes the figures as provisional and notes that revisions are more often upwards than downwards.

For you, this means that across domestic, inward and outward deals combined, and across every industry, there are a few hundred control transactions a quarter at that size. The bulletin reports counts and aggregate values, not multiples. The number of genuinely comparable deals in your niche and size band will be small.

Competition and Markets Authority decisions

The Competition and Markets Authority (CMA) publishes its merger case decisions. These describe the parties, the overlap between them and the rationale for each deal.

They help you judge whether a deal is truly comparable and whether the buyer paid for synergies. They rarely disclose multiples, though, and most owner-managed business sales are far too small to come before the CMA.

Commercial deal databases

Subscription databases compile disclosed deal terms from announcements, filings and adviser submissions. Their coverage leans towards larger deals, and towards deals where one party chose to publicise the price. Treat any record as a lead to verify, not as evidence in itself. We do not quote figures from these sources on this page.

An adviser’s own completed deals

For smaller businesses, an adviser’s own completed transactions are often the richest source, because the full terms are known. Those terms include the earn-out, the deferred consideration, the working capital settlement and the normalised earnings the buyer actually priced on.

Choosing the right transaction multiple

Use the multiple that buyers in your segment actually price on. Apply the same earnings definition to your business and to every comparable, because mixing definitions is one of the most common errors in small business valuation.

Multiple	What it measures	Best fit	Watch for
EV/EBITDA	Enterprise value divided by EBITDA	Established companies, especially where buyers fund deals with debt	Capital-heavy businesses where EBITDA overstates cash; lease accounting differences between comparables
EV/revenue	Enterprise value divided by turnover	Loss-making, early-stage or recurring-revenue businesses; also a sanity check	Ignores margin, so two firms with equal revenue but different profitability look alike
SDE multiple	Price divided by seller’s discretionary earnings (SDE), which is profit before the owner’s pay and perks, interest, depreciation and one-off items	Small owner-operated businesses where the buyer will run the business personally	UK brokers often call this adjusted net profit; never mix an SDE multiple with EBITDA
P/E	Equity value divided by profit after tax	Rarely used for private deals; useful where capital structures match	Distorted by debt levels, tax position and owner remuneration

Adjusting multiples for comparability

Headline multiples are rarely like-for-like. Before you apply any multiple, adjust the comparable deals and your own earnings to a common basis.

Normalise earnings on both sides

Adjust your own figures for the following:

• owner pay, restated to a market rate for a replacement manager
• related-party rent, restated to market rent
• one-off costs and income
• non-trading items

Then ask whether each comparable multiple was struck on reported or normalised earnings. If you cannot tell, give that deal less weight.

Timing and market conditions

When conditions have moved since a deal completed, you have two options. You can shorten the window, or you can adjust the multiple with reasoning you can explain, such as changes in borrowing costs, sector outlook and buyer demand. Avoid mechanical indexation, because it gives false precision to what is really a judgement.

Size

Smaller businesses usually carry more risk per pound of profit, through customer concentration, dependence on the owner and thinner management. If your business is smaller than most of your comparables, select from the lower part of the adjusted range rather than applying a formula discount.

Control, minority and marketability

Transaction multiples already include a control premium, so do not add another one. If you are valuing a minority holding, you need a discount for lack of control. You usually also need a discount for lack of marketability (DLOM), which reflects how hard it is to sell a small unquoted stake. Both discounts are judgements, and both are frequently challenged.

Deal structure: earn-outs and deferred consideration

Headline prices often include contingent consideration. An earn-out pays the seller more if the business hits targets after completion. Counted at face value, it inflates the headline multiple.

Restate each earn-out at its expected present value. That means the probability-weighted payment, discounted for the time until payment and the risk that the buyer cannot pay. Fixed deferred consideration and vendor loan notes need the same time and credit adjustment.

Also watch for value paid outside the share price, such as a generous consultancy agreement for the seller. Likewise watch for retentions held back against warranty claims. The worked example below shows an earn-out turning a 7.5x headline multiple into a 6.6x like-for-like multiple.

Strategic synergies and special purchasers

A trade buyer that can cut duplicated overheads or cross-sell may pay more than anyone else could justify. That price is real, but it belongs to that particular buyer.

If your likely buyers include similar consolidators and you will run a competitive process, synergy-driven deals are relevant evidence. For a tax valuation, or a sale to a financial buyer, strip the synergy out or reduce the deal’s weight. The HMRC section below explains why.

Debt-free cash-free basis and normalised working capital

Most UK private company sales are priced on a debt-free cash-free basis with a normal level of working capital. The buyer pays enterprise value, the seller repays debt and keeps surplus cash, and the price moves up or down if working capital at completion differs from the agreed normal level. Under a locked box structure, the price is instead fixed from a historic balance sheet, with protection against value leaking out before completion.

Before you use a comparable, confirm which basis its headline price was on. A price quoted after debt repayment is an equity value, and dividing it by EBITDA produces a meaningless multiple.

Adjustment checklist

Adjustment	Question to ask	Usual effect on the comparable multiple
Earn-out	Is contingent consideration counted at face value?	Lowers it once restated at expected present value
Deferred consideration	Are fixed future payments discounted?	Lowers it slightly
Synergistic buyer	Did a special purchaser pay for benefits others could not obtain?	Lowers it for open market or tax purposes
Debt and cash	Was the price quoted before or after debt and cash?	Either direction; restate to enterprise value
Working capital	Did the price include a normal level of working capital?	Either direction
Asset or share sale	Were liabilities, debtors or creditors excluded?	Either direction; restate to the same scope
Owner remuneration	Was the comparable’s seller paid a market rate?	Either direction
Deal date	Were financing conditions different from today’s?	Either direction
Stake	Was it a minority or control deal?	Exclude minority deals from a control set

Worked example: valuing an owner-managed cleaning company

All figures in this example are invented for illustration. They are not market data, and they do not indicate what any real business or sector is worth.

Step 1: Define the subject and the basis of value

The subject is a commercial cleaning company in England, classified under SIC 81210 (general cleaning of buildings). The valuation is for a sale of 100% of the shares. The basis is enterprise value on a debt-free cash-free basis. The valuation date is 30 September 2026.

Step 2: Normalise the subject’s earnings

Item	Amount
Reported EBITDA, year to 31 March 2026	£520,000
Less: uplift of owner’s pay to a market-rate managing director	minus £55,000
Add back: one-off legal costs	plus £40,000
Add back: rent paid to the owner above market rent	plus £20,000
Normalised EBITDA	£525,000

Step 3: Screen and score the comparables

Deal	Description	Date	Stake and structure	Score out of 14	Decision
A	Commercial cleaning, South East England, EBITDA £700,000	2025	100% share sale, all cash	12	Include
B	Facilities services with a cleaning core, Midlands, EBITDA £450,000	2024	100% trade and asset sale	9	Include
C	Commercial cleaning, North West England, EBITDA £800,000	2025	100% share sale with earn-out, synergistic trade buyer	10	Include
D	Commercial cleaning, EBITDA £500,000, headline price only	2021	100% share sale	8	Exclude: below threshold and outside date window
E	Commercial cleaning, EBITDA £600,000	2025	30% minority stake	7	Exclude: minority interest

Step 4: Restate each headline multiple on a like-for-like basis

Deal	Headline EV	EBITDA	Headline multiple	Adjustment	Adjusted EV	Adjusted multiple
A	£4,200,000	£700,000	6.0x	None needed	£4,200,000	6.0x
B	£2,400,000	£450,000	5.3x	Add £200,000 of working capital excluded from the asset sale	£2,600,000	5.8x
C	£6,000,000	£800,000	7.5x	Replace the £1,500,000 earn-out at face value with an expected present value of £800,000	£5,300,000	6.6x

For Deal C, the £800,000 figure assumes a 60% chance that the earn-out targets are met. That gives an expected payment of £900,000, which is then discounted for the two to three years until payment.

Step 5: Weight the multiples and select a range

Weighting by score works like this: 12 times 6.0, plus 9 times 5.8, plus 10 times 6.6, all divided by 31. That gives a weighted multiple of 6.1x.

Two judgements then pull the selection down:

• The subject is smaller than Deals A and C.
• Deal C’s price reflects a buyer with synergies.

The selected range is 5.8x to 6.3x, with a point estimate of 6.0x. Applied to normalised EBITDA of £525,000, this indicates an enterprise value of £3,045,000 to £3,307,500, with a point estimate of £3,150,000.

Step 6: Bridge from enterprise value to equity value

Item	Amount
Enterprise value at 6.0x	£3,150,000
Less: bank loan	minus £400,000
Less: finance leases	minus £60,000
Add: surplus cash	plus £250,000
Less: working capital shortfall (normal level £300,000, expected £270,000)	minus £30,000
Equity value to the shareholders	£2,910,000

Step 7: Cross-check with another method

Run at least one other method. Suppose a discounted cash flow valuation implies a multiple of normalised EBITDA well outside 5.8x to 6.3x. If so, find out why before you settle on a figure. The gap usually traces to a growth assumption, a risk judgement or a comparable that does not belong in the set.

How HMRC and the courts treat comparable transactions

HMRC accepts evidence of actual transactions, but it weighs each deal on its facts. It also sets aside prices that reflect one buyer’s special reasons.

The statutory definition of market value

HMRC’s Capital Gains Manual guidance on unquoted shares sets out the rule under section 272 of the Taxation of Chargeable Gains Act 1992. Market value is the price expected in an open market sale between a hypothetical willing seller and a hypothetical willing buyer. The same guidance confirms that HMRC’s Shares and Assets Valuation team is responsible for valuing unquoted shares.

For you, this means a tax valuation prices a hypothetical open market sale. It does not price the deal you might negotiate with one particular buyer.

How much weight transaction evidence carries

HMRC’s Shares and Assets Valuation Manual guidance on transaction evidence, last revised in 2022, summarises IRC v Stenhouse’s Trustees (1992). The court held that evidence of actual transactions in the shares being valued is admissible.

Some of those deals may be of no use. However, deals between parties genuinely trying to reach an open market price should not simply be ignored, and the weight each deal deserves is a question of fact and circumstance. Expect at least the same scrutiny for deals in other companies. Every comparable in a tax valuation needs a recorded reason why it reflects an arm’s length, open market price.

Special purchasers

The manual’s guidance on special purchasers, also last revised in 2022, draws on Re Lynall and related cases. A special purchaser affects open market value only where cogent evidence shows three things at the valuation date:

• The purchaser was offering to buy.
• The purchaser could afford the enhanced price.
• That fact was known to the market.

For you, this means a comparable price inflated by one synergistic buyer is weak evidence of market value for tax. It is also why the price you can achieve in a competitive sale and your value for a tax purpose can legitimately differ.

UK tax legislation uses market value on an open market hypothesis. Fair market value is the equivalent US standard, so check the definitions before relying on US guidance for a UK tax valuation.

Limitations and common mistakes

The method records what buyers paid in the past. It cannot tell you what your business will earn. Most errors come from treating a headline multiple as a fact rather than a starting point.

The structural limits are real. Deal data is sparse and lagging, and it is skewed towards deals someone chose to disclose. No two businesses are identical, so every comparable requires judgement.

These are the mistakes we see most often:

• Borrowing a sector average multiple without the deal terms behind it. You cannot adjust what you cannot see.
• Applying an SDE multiple to EBITDA, or the reverse. The two earnings bases differ by the cost of a replacement manager, so the multiples differ too.
• Normalising your own earnings but not the comparables’ earnings. Upward adjustments on one side only will inflate the value.
• Counting earn-outs and deferred payments at face value.
• Adding a control premium to multiples that already contain one.
• Relying on one or two deals. A single deal is an anecdote, not a market.
• Choosing comparables after deciding the answer. Set your selection criteria before you look at any multiples.

Reconciling with the income and asset approaches

Comparable transactions valuation should rarely stand alone. Reconcile it with at least one of the other main business valuation methods. Then weight the results by how reliable their inputs are, rather than simply averaging them.

The income approach

The income approach values future cash flows directly. A discounted cash flow valuation is most useful when earnings are changing, for example after a major contract win or during rapid growth.

Convert its result into an implied multiple of your normalised EBITDA, and compare it with your comparable range. If the implied multiple sits well above the range, the forecast may be optimistic. If it sits well below, the market may see less risk than your discount rate assumes.

The asset approach

The asset approach sets a floor for asset-rich businesses. If your comparable transactions value falls below adjusted net asset value, one of two things is likely: the business may be worth more broken up, or its earnings may be understated. Investigate before you conclude.

Weighting the results

Where the methods agree within a reasonable band, the comparable transactions result usually carries most weight for an owner-managed sale, because it reflects what buyers actually pay. Where they disagree, the explanation matters more than the midpoint.

Frequently asked questions

How accurate is comparable transactions valuation for a small business?

It is as accurate as the comparable set behind it. With several well-documented deals in the same activity and size band, it gives a defensible range. With one or two loosely similar deals, treat the result as indicative only.

How many comparable transactions do you need?

There is no statutory minimum. In practice, three to five well-matched and fully adjusted deals are more reliable than a long list of loosely similar ones, and every excluded deal should have a recorded reason.

How old can a comparable transaction be?

Start with deals from the last two to three years and extend the window only if the set is too thin. Older deals need adjusting for changes in financing conditions, sector outlook and buyer demand since they completed.

Does HMRC accept comparable transactions valuation?

HMRC’s valuation guidance treats evidence of actual transactions as admissible, but the weight given to each deal depends on the facts. Deals that reflect a special purchaser’s own reasons, or that were not at arm’s length, carry little weight for tax purposes.

Is precedent transactions analysis the same as comparable transactions valuation?

Yes, both names describe the same method. Precedent transactions analysis is the investment banking term, while brokers and valuers of private companies usually say comparable transactions.

Where can I find comparable transaction data in the UK?

Companies House filings and ONS merger statistics give useful context but rarely show the multiple paid. Pricing evidence usually comes from subscription deal databases, verified against primary documents, and from an adviser’s own completed transactions.

Get a valuation built on real deal evidence

A comparable transactions valuation is only as strong as the deal evidence and the judgement behind the adjustments. If you are preparing to sell, we can review your business against the transaction evidence available for your sector. We will show you the range, the reasoning and every assumption behind it. Start with a free, confidential business valuation.

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