When a buyer values a dental practice on an EBITDA multiple, they are not applying that multiple to the figure in your accounts. They are applying it to a normalised version of your earnings — one that strips out costs specific to you as the owner-operator and replaces them with what a new owner would actually spend to run the same practice. The difference between your reported EBITDA and your normalised EBITDA can be substantial. Understanding what can legitimately be adjusted, how to calculate the adjustments, and how to document them determines whether the normalised figure supports your valuation or becomes a source of friction in negotiations.
What EBITDA Normalisation Is
Normalisation converts reported practice earnings into a figure that represents what the business would generate for a different owner running it on market terms. A multiple — typically 3x to 8x depending on practice profile — is then applied to this normalised figure, not to the raw accounts.
The logic is straightforward. Your accounts reflect decisions that are personal to you: the salary you chose to draw, the expenses you ran through the business, the rent you pay to a company you control. A buyer inheriting the business will not make the same decisions. Normalisation adjusts for this so the earnings figure is comparable across practices and genuinely reflects what the business produces.
Done properly, normalisation is a legitimate and expected part of the sale process. Done carelessly — or dishonestly — it becomes a liability.
What Can Be Normalised
Owner Salary and Drawings
This is typically the largest single adjustment and the one that requires the most care.
Where the principal clinician is drawing a salary or taking drawings from the practice, the normalisation question is: what would it cost to replace the clinical output that principal is generating? The answer is not zero — a buyer replacing the principal’s chair time with associates will incur a cost — but it is usually different from what the principal is drawing.
The adjustment works in both directions. If the principal is drawing £200,000 per year but market-rate associates would deliver the same output for £120,000, the normalisation adds back £80,000 to EBITDA. If the principal is drawing £60,000 but their clinical output is worth £140,000 at market associate rates, the normalisation reduces EBITDA by £80,000.
Sellers who draw a below-market salary to maximise apparent profitability should be aware that buyers will perform this adjustment regardless. A practice where the principal is generating significant clinical revenue on a modest salary will not be valued as if that cost can be permanently maintained.
Personal Expenses Run Through the Practice
Many practice owners legitimately run personal expenses through the practice in a way that is tax-efficient but not reflective of what a new owner would spend. Common items include:
- Mobile phones and associated contracts where personal use is primary
- Vehicle costs including lease payments, fuel, and insurance on owner vehicles
- Private health insurance and similar personal benefits
- Personal subscriptions — professional memberships that are personal rather than practice-facing, entertainment platforms, or similar items
Each of these is a legitimate addback provided it can be demonstrated that a new owner would not incur the same cost in the ordinary running of the practice.
One-Off and Non-Recurring Costs
Costs that were incurred in a specific period but do not form part of the ordinary cost base of the business can be added back. Examples include:
- Professional fees for one-time events: a specific CQC appeal, a lease negotiation, a shareholder dispute, a one-off compliance matter
- One-off recruitment costs where a specific senior hire created an atypical expense
- Equipment expensed rather than capitalised in a single year where the equipment remains in service
The test is whether the cost would be incurred again in the ordinary course of operating the business. If the answer is no — and the cost was genuinely exceptional — the addback is supportable.
Above-Market Rent to a Related Party
Where the practice pays rent to a connected entity — a property company owned by the principal or a family member — and that rent is above the market rate for equivalent premises, the excess can be normalised. The adjustment requires a market rent appraisal from a surveyor: without independent evidence of the market rate, the addback will not be accepted.
This is one of the more scrutinised normalisation claims. Buyers are alert to inflated related-party rent being reversed to manufacture EBITDA, and any appraisal that appears circular or commissioned for the purpose of justifying a specific number will be challenged.
Associate Cost Replacement in Detail
The principal salary adjustment is more technical than it first appears and deserves specific attention.
The starting point is understanding what the principal is actually generating clinically. Identify the proportion of UDA delivery and private income attributable to the principal’s own chair time. Apply the current market rate for an associate to deliver those UDAs — rates vary by geography and specialism but are generally in the range of £12–14 per UDA for general dentistry, with higher rates for practices with a significant specialist component. Add the cost of delivering the equivalent private income through an associate, typically expressed as a percentage of private chair income.
The sum of these — UDA delivery cost plus private income cost at market associate rates — is what it would cost to replace the principal’s clinical output. The difference between this figure and the principal’s actual drawings is the legitimate normalisation.
Example: A principal is drawing £180,000. Their chair time generates 4,000 UDAs and £80,000 of private income. Market associate cost: 4,000 UDAs × £13 = £52,000, plus £80,000 private × 45% = £36,000. Total replacement cost: £88,000. Legitimate addback: £180,000 − £88,000 = £92,000.
Where the principal draws modestly relative to their clinical output, buyers will perform this same calculation and apply the resulting downward adjustment to EBITDA. Presenting the adjustment proactively — with the workings — is stronger than allowing the buyer’s adviser to discover and apply it independently.
What Cannot Be Normalised
Not everything that runs through the practice can be added back. Buyers and their advisers will reverse these claims if they appear in the normalisation schedule.
Standard operational costs. Staff wages at market rate, ordinary materials and lab fees, utilities, insurance, and routine maintenance are the cost of running the business. They are not addbacks.
NHS clawback and UDA shortfall risk. Clawback risk is a real financial exposure that belongs in the earnings calculation. Sellers sometimes attempt to present clawback provisions as one-off items; buyers will not accept this where underdelivery has been a pattern.
Associate fees at market rate. Where associates are already paid at market rate, there is nothing to normalise. The temptation to argue that associate costs are excessive — and therefore addable — rarely survives scrutiny.
CQC and compliance costs. Ongoing compliance expenditure is part of running a dental practice. One-off costs related to specific enforcement action may be addable if genuinely exceptional, but routine CQC registration, inspections, and compliance maintenance are not.
How Buyers Test Normalisation Claims
Buyers and their advisers will test every line in the normalisation schedule. Understanding how they do this helps you build documentation that holds up.
Personal expense claims require evidence that the expense is personal rather than practice-related. Bank statements, credit card records, and a clear narrative explaining why the item was personal are the minimum standard. Vague categorisations do not survive due diligence.
One-off cost claims are tested across multiple years of accounts. If a cost categorised as one-off appears in two or more years, it is structural — not exceptional. The addback will be removed. This is particularly relevant for professional fees, which can accumulate across years in ways that are individually defensible but collectively suggest an ongoing cost.
Principal salary normalisation is tested against market data. Buyers will obtain their own view of current associate rates and apply them independently. Where your calculation differs materially from the market data, you will need to justify the difference.
Undocumented items are either reversed entirely or treated as a price chip in negotiations. If an addback cannot be supported with documentation, buyers will not give credit for it in the headline price — they will use the uncertainty to renegotiate after exclusivity.
Presenting Normalisation in the Information Memorandum
The way normalisation is presented is as important as the adjustments themselves. A clear, well-structured normalisation table in the information memorandum sets the tone for the transaction and makes the schedule significantly harder to challenge.
The standard format is:
| Item | Amount |
|---|---|
| Reported EBITDA (per accounts) | £X |
| Add: owner drawings above associate replacement cost | £X |
| Add: personal mobile and vehicle expenses | £X |
| Add: one-off legal fees (lease negotiation, year ended [date]) | £X |
| Add: above-market rent normalised to market rate | £X |
| Normalised EBITDA | £X |
Each line should include the source of the figure, the basis for the adjustment, and — where the adjustment has been calculated rather than lifted directly from the accounts — the working. A one-paragraph supporting note for each material adjustment is standard in a well-prepared IM.
Transparent, well-documented normalisation is not a weakness. It demonstrates that the seller has done the work honestly and is presenting earnings that will survive scrutiny. A buyer who cannot find fault with the normalisation schedule is a buyer who is negotiating price from a position of confidence rather than using undocumented addbacks as a tool to renegotiate.
For the methodology behind how a multiple is then applied to the normalised figure, see our guide to dental practice valuation. If you are planning a sale and want to understand how normalisation affects your headline price, our guide to selling your dental practice covers the full process from preparation through completion.
Find out what your dental practice is worth →
Frequently Asked Questions
What is EBITDA normalisation in a dental practice sale?
Normalisation adjusts reported practice earnings to remove costs that are specific to you as the owner-operator — salary drawn above associate replacement cost, personal expenses, and genuine one-off items — to arrive at a figure that represents what the business would generate for a new owner. Buyers apply their purchase multiple to this normalised figure, not to the raw accounts.
How is the principal salary addback calculated?
The adjustment is the difference between what the principal actually draws and what it would cost to replace their clinical output using market-rate associates. Calculate the UDA delivery and private income attributable to the principal’s chair time, price that output at current market associate rates, and the difference between that cost and the actual drawings is the addback. Sellers on a below-market salary will see a downward adjustment applied.
What documentation do buyers require for normalisation addbacks?
Personal expense addbacks require evidence that the cost is personal rather than practice-related — bank statements, receipts, and a clear explanation. One-off cost claims are tested across multiple years of accounts. Owner salary normalisation is verified against market associate rate data. Undocumented addbacks are reversed or become a negotiating chip at the buyer’s disposal.
Can related-party rent be normalised?
Yes, where the rent paid exceeds the market rate for equivalent premises. The adjustment requires an independent market rent appraisal from a surveyor — without third-party evidence, the claim will not be accepted. Buyers are particularly attentive to above-market related-party rent as a mechanism for inflating EBITDA.