Adjusted EBITDA is a measure of maintainable earnings. It starts with reported EBITDA and adjusts for credible one-off, personal or non-recurring costs — giving buyers a clearer estimate of what the business should realistically earn going forward. It is one of the most important — and most contested — figures in any small business sale.
Quick Answer: What is adjusted EBITDA?
EBITDA stands for Earnings Before Interest, Tax, Depreciation and Amortisation. It is a measure of operating profit that strips out financing costs and non-cash accounting entries, giving a cleaner view of the underlying trading profitability of a business.
Adjusted EBITDA goes one step further. It starts with EBITDA and then removes — or "adds back" — costs that the seller argues are personal, one-off or non-recurring, and therefore would not be incurred by a new owner. The purpose is to show what maintainable earnings look like under normal conditions.
Adjusted EBITDA matters enormously in business sales because it is often the figure to which a valuation multiple is applied. If the seller's adjusted EBITDA is £100,000 and a 3x multiple is agreed, the implied value is £300,000. If the adjusted EBITDA is challenged and reduced to £75,000, the implied value falls to £225,000 — a difference of £75,000 from a single line of analysis.
Buyers should always review adjusted EBITDA critically. Add-backs are a common area of disagreement and sometimes of genuine misrepresentation.
Contents
What EBITDA means
EBITDA is a widely used financial metric that measures a business's operating profitability before certain accounting and financing adjustments.
Breaking it down:
E — Earnings.The profit the business generates from its operations.
B — Before.EBITDA is calculated before the following are deducted:
I — Interest.Financing costs on loans and borrowings. These are excluded because they depend on how the deal is financed — a buyer who funds the acquisition differently would have different interest costs.
T — Tax.Corporation Tax or income tax is excluded because it depends on the owner's personal tax position and the deal structure — both of which may change after the sale.
D — Depreciation.A non-cash accounting charge that reduces the book value of fixed assets over their expected useful life. EBITDA adds this back because it is not a real cash outflow in the period.
A — Amortisation.Similar to depreciation but applied to intangible assets such as goodwill, trademarks and software. Also added back as a non-cash charge.
Starting from net profit, you calculate EBITDA roughly as follows:
Net profit before tax - £55,000
Add back: interest - £8,000
Add back: depreciation - £12,000
Add back: amortisation - £5,000
EBITDA-£80,000
EBITDA gives a cleaner view of operating profitability than net profit, because it removes items that are specific to the current owner's financing and accounting choices rather than reflecting the underlying trading performance.
What adjusted EBITDA means
Adjusted EBITDA — sometimes called normalised EBITDA or, in smaller business sales, Seller's Discretionary Earnings (SDE) — takes the EBITDA calculation and makes additional adjustments for costs that the seller argues are personal, exceptional or non-recurring.
The theory is sound: some costs in a small business reflect the current owner's personal choices or circumstances rather than the genuine cost of operating the business. A new buyer running the same business would not incur these costs. Adding them back to reported profit gives a cleaner view of what the business would earn under normalised conditions.
Building on the previous example:
EBITDA - £80,000
Add back: owner's personal mobile phone cost - £1,200
Add back: one-off legal dispute cost (non-recurring) - £8,500
Add back: above-market family member salary (excess only) - £12,000
Add back: one-off consulting cost - £6,000
Adjusted EBITDA-£107,700
In this example, the seller is claiming that the business earns approximately £107,700 of maintainable profit — significantly more than the reported EBITDA of £80,000. The difference of £27,700 represents costs the seller believes should not be included when a buyer is assessing the business's ongoing earnings potential.
Whether those add-backs are legitimate is exactly the question a buyer must investigate.
Why adjusted EBITDA is used in business sales
Adjusted EBITDA has become the standard earnings measure in business sales for several practical reasons.
Small businesses are often financially intertwined with their owners.A sole director may pay themselves a below-market salary and take most of their income as dividends. They may run personal expenses through the company. A family member may work in the business but not be paid a market wage. These practices, which are entirely legal and common, mean that reported profit understates or overstates what a new owner would experience.
Reported profit can include genuine one-off items.A legal dispute in one year, a one-off piece of equipment that needed replacing, an unusually high bad debt from a customer who subsequently paid — all of these are real costs that hit the reported profit in a given year but are not expected to recur.
EBITDA removes financing effects.Because a buyer will typically finance the acquisition differently from how the seller financed the business, interest charges are irrelevant to the underlying operating comparison. Removing them creates a more comparable baseline.
Depreciation can distort comparisons.Depreciation rates vary depending on the asset, the accounting policy and the owner's choices. Adding it back creates a cleaner operating profit figure.
For these reasons, adjusted EBITDA has become the standard reference point for valuation in most small to medium business sales. But it is a starting point for analysis, not an end point. Buyers must review every add-back critically.
Common valid add-backs
The following types of add-backs are commonly considered legitimate, provided they are documented and evidenced:
Genuine personal expenses.Costs the owner has run through the business that are personal in nature rather than business costs — a personal mobile phone, personal subscriptions, personal travel, personal insurance. These should appear in the accounts but with evidence (receipts, invoices) confirming their personal nature.
One-off legal or professional costs.A legal dispute that has been resolved and is unlikely to recur, or a specific piece of professional advice for a one-time event (a restructuring, a regulatory change), may be a valid add-back. The key question is whether the cost is genuinely exceptional or whether the business regularly incurs similar costs under different descriptions.
One-off repairs or capital expenditure.A significant repair that will not recur — replacing a roof, replacing a key piece of equipment — may be added back. However, routine maintenance costs (which every business incurs) are not valid add-backs.
Above-market family wages.If a family member is employed in the business and paid more than a market rate for their role — or paid for a role that does not genuinely exist — the excess can be added back. Only the excess is valid; the market-rate salary for that role should remain in the cost base.
Owner salary that is below market rate.In SDE calculations particularly (common for smaller businesses), the owner's entire salary may be added back and a "replacement manager cost" subtracted, to show what the business earns before the owner pays themselves. This is legitimate if done consistently and transparently.
Non-recurring consultancy or project costs.One-time consultancy to address a specific problem or project — not the cost of ongoing consultancy that the business depends on.
One-off bad debts.A specific customer debt that has been written off but is not representative of the business's normal credit experience.
In every case, the test is the same: would a new owner running the same business in the normal course incur this cost? If not, and if it is documented and evidenced, it may be a valid add-back.
Weak or questionable add-backs
A significant proportion of add-backs presented in small business sales are either overstated, poorly evidenced or simply not valid. Buyers should challenge these rigorously.
Normal marketing and advertising costs.A seller may argue that a marketing campaign was "one-off" because they tried something new. But if the business needs marketing to sustain its revenue, marketing is an ongoing cost — not an add-back.
Routine repairs and maintenance.Equipment breaks down. Buildings need maintenance. These are recurring costs of operating a business. If repairs vary year to year, the right approach is to normalise them — use a multi-year average — not to add back an unusually high year.
Owner salary removed entirely.In SDE calculations, the owner salary may be removed — but only if a market-rate replacement manager cost is also subtracted. A seller who removes their salary completely but does not account for the cost of replacing their labour is presenting a misleadingly high profit figure.
Required software or subscriptions.If the business depends on specific software tools — a booking system, a CRM, a design platform — these are normal operating costs, not add-backs.
Costs that recur under different descriptions.A seller who added back a "one-off consulting fee" in three consecutive years is not presenting one-off costs. They are presenting recurring costs by another name.
Below-market rent.If the business operates from a property owned by the seller or a related party at below-market rent, this is a hidden subsidy that will not be available to a buyer. The adjusted EBITDA should include a market-rate rent, which may mean deducting an amount rather than adding back.
Costs transferred to the seller personally.Some sellers move costs out of the business accounts in the period before a sale specifically to improve the reported profit. This is an area where bank statements and VAT returns should be cross-checked against the accounts.
Aggressive add-backs without evidence.An add-back presented as a round number — "£15,000 personal expenses" — without any supporting documentation is not valid. Every add-back should be evidenced by invoices, receipts or other records.
How valuation multiples interact with adjusted EBITDA
Adjusted EBITDA matters so much because it is the figure to which a valuation multiple is applied. The multiple is the number of years' earnings a buyer is prepared to pay — and even a small change in adjusted EBITDA has a significant impact on the headline price.
A simple illustration:
Seller's presented figure - £100,000 - 3.0x - £300,000
Buyer's reviewed figure (after challenging add-backs) - £75,000 - 3.0x - £225,000
Buyer's reviewed figure with lower multiple for higher risk - £75,000 - 2.5x - £187,500
The difference between the seller's implied value (£300,000) and the buyer's risk-adjusted value (£187,500) is more than £112,000 — entirely the product of challenging the add-backs and the multiple. This is why adjusted EBITDA analysis is one of the most financially consequential steps in any business acquisition.
Valuation multiples for small UK businesses typically range from 2x to 5x adjusted EBITDA, depending on the sector, size, risk profile, lease quality, customer concentration, staff depth and growth potential. A business with strong recurring revenue, good systems, low owner dependency and a long lease will command a higher multiple than one with uncertain revenue, heavy owner dependency and a short lease — even if their headline adjusted EBITDA figures are the same.
How buyers should review adjusted EBITDA
Every buyer should approach the seller's adjusted EBITDA figure as a starting point for analysis rather than an accepted fact.
Step 1: Start with reported EBITDA.Ask for the profit and loss account for the last three years. Calculate EBITDA from net profit by adding back interest, tax, depreciation and amortisation. This gives you the base.
Step 2: Review the seller's add-back schedule.Ask for a written schedule of every add-back the seller is claiming, with the amount and a brief description. Do not accept a headline adjusted EBITDA figure without seeing the components.
Step 3: Challenge each add-back.For each item, ask: Is this genuinely non-recurring? Is it personal rather than a business cost? Is there evidence? Would a new owner incur this cost in the normal course of business? Has this type of cost appeared in previous years under a different description?
Step 4: Check for missing costs.Are there costs that should be in the accounts but are not? Is a market-rate rent being paid, or is there a related-party arrangement? Is the owner salary realistic for the work they do? Are there any staff working informally who should be on the payroll?
Step 5: Adjust for recent trading.How does the adjusted EBITDA compare to recent management accounts? A business whose profit has been falling for two years should not be valued on the basis of its best historic year.
Step 6: Calculate your own adjusted EBITDA.Once you have reviewed the accounts and the add-back schedule, calculate your own view of the maintainable adjusted EBITDA. This is the figure you use to derive your valuation.
Step 7: Engage your accountant.An accountant with experience in business acquisitions should review the accounts and the add-back schedule independently. Their analysis will often identify issues that are not visible to a non-specialist.
Mistakes sellers make with add-backs
Sellers sometimes damage their own credibility — and even their sale — by presenting add-backs that are obviously excessive or poorly evidenced.
Adding back costs without evidence.A round-number add-back — "£20,000 personal expenses" — presented without receipts, invoices or any supporting documentation will not survive buyer scrutiny. It raises immediate suspicion and often causes buyers to question the entire profit figure.
Adding back recurring costs as one-off.Claiming that a cost which appears in every set of accounts is non-recurring destroys credibility. Buyers look at three years of accounts. If the same "one-off" cost appears every year, it is not one-off.
Removing the owner salary entirely.Removing the owner's salary without substituting a realistic market-rate management cost overstates adjusted EBITDA in a way that any experienced buyer or their accountant will immediately identify. It can make the seller look unsophisticated or dishonest.
Inflating stock or asset values in the accounts before sale.Adjusted EBITDA relates to the profit and loss account, but buyers also review the balance sheet. Unexplained increases in stock or asset values in the period before a sale are a flag.
Presenting different figures in different documents.If the information memorandum says one adjusted EBITDA and the accounts suggest another, buyers will investigate the discrepancy — and will draw negative conclusions about the seller's honesty if it cannot be clearly explained.
A well-presented, transparent adjusted EBITDA schedule — with every add-back clearly described and evidenced — is far more likely to withstand scrutiny and support a successful sale than an aggressive, poorly supported one.
Adjusted EBITDA checklist
Use this checklist when reviewing adjusted EBITDA for a business you are considering buying:
Starting net profit figure confirmed from filed or management accounts
EBITDA calculated from net profit (adding back interest, tax, depreciation, amortisation)
Seller's add-back schedule obtained in writing, itemised by cost category and amount
Each add-back assessed: genuinely one-off? Genuinely personal? Evidenced?
Any recurring costs claimed as one-off identified and challenged
Owner salary treatment confirmed — is it included or removed, and is a replacement cost deducted?
Family member wages reviewed — are any above market rate, and has only the excess been added back?
Missing costs identified — market-rate rent, replacement management, any informal staff costs
Recent trading confirmed — are management accounts consistent with the historic adjusted EBITDA?
Multi-year trend reviewed — is profitability growing, stable or declining?
Buyer's own adjusted EBITDA calculated and compared to seller's figure
Valuation multiple assessed relative to deal-specific risk factors
Accountant review of accounts and add-back schedule commissioned
FAQs
What is the difference between EBITDA and adjusted EBITDA?
EBITDA is earnings before interest, tax, depreciation and amortisation — calculated directly from the accounts. Adjusted EBITDA starts with EBITDA and then removes (adds back) costs that are personal, one-off or non-recurring, to show maintainable earnings. The difference can be significant — sometimes 20 to 40% of the EBITDA figure in small business sales.
Why do sellers use adjusted EBITDA rather than net profit?
Net profit in a small business is often distorted by the owner's personal choices — salary level, dividend policy, depreciation choices, personal expenses in the accounts. EBITDA removes some of these distortions. Adjusted EBITDA then removes additional owner-specific costs, giving a cleaner view of the business's underlying earning potential for a new owner.
Should I always accept the seller's adjusted EBITDA?
No. You should always review it critically with your accountant. Every add-back should be evidenced. Any costs that are normal and recurring should be challenged. Missing costs (below-market rent, below-market owner salary) should be identified and deducted. Your own independently calculated adjusted EBITDA is the figure your valuation should be based on.
What is a typical adjusted EBITDA multiple for a small UK business?
It varies significantly by sector, size and risk profile. Most small UK businesses trade at 2x to 4x adjusted EBITDA, with stronger businesses (recurring revenue, low owner dependency, long lease, strong management) at the higher end. Businesses with high risk factors — declining revenue, high customer concentration, short lease, heavy owner dependency — typically attract lower multiples. Your accountant and any sector specialist you consult can give you a view on what is appropriate for the specific deal.
What is Seller's Discretionary Earnings (SDE)?
SDE is a similar concept to adjusted EBITDA, used more commonly for smaller owner-operated businesses. In SDE calculations, the owner's entire salary (and sometimes other owner benefits) is added back to profit, with the rationale that the new owner will set their own pay differently. A replacement manager cost is then deducted to give an adjusted earnings figure. The distinction from adjusted EBITDA is largely one of presentation; the underlying analysis is similar.
Are add-backs always legitimate?
Not at all. Many add-backs presented by sellers are overstated, poorly evidenced or simply not valid. Normal business costs — marketing, routine maintenance, software, ongoing consultancy — cannot legitimately be added back simply because the seller wants to present a higher profit figure. Every add-back should survive the simple test: would a new owner running the business in the ordinary course incur this cost?
Key takeaways
EBITDA is earnings before interest, tax, depreciation and amortisation— a cleaner measure of operating profit than net profit.
Adjusted EBITDA adds back personal, one-off or non-recurring coststo show what a buyer should realistically expect to earn.
Adjusted EBITDA is the figure most commonly used to derive a valuation multiplein small business sales. Every pound of adjustment has a multiplied effect on the implied price.
Every add-back must be evidenced and genuinely one-off.Normal operating costs — marketing, routine repairs, required software — are not valid add-backs.
Missing costs must be deducted.Below-market rent, below-market owner salary and unrecorded family labour all reduce the true maintainable profit.
Buyers should calculate their own adjusted EBITDArather than accepting the seller's figure, and should commission an accountant review before relying on the result.
Aggressive or poorly evidenced add-backs damage credibilityand can undermine a deal. Transparent, well-supported add-backs are more likely to be accepted.
Related resources
Important disclaimer
Buy a Business Ltd is a marketplace, not a broker, corporate finance adviser, M&A adviser, law firm, accountant, tax adviser, lender, valuation firm, surveyor, insolvency practitioner or investment adviser. Information, guides, checklists and examples on this site are for general guidance only and do not constitute legal, tax, financial, investment, lending, valuation, property, employment, data protection, brokerage, corporate finance, M&A or regulated advice.
Buying or selling a business involves risk. You should seek independent professional advice before buying, selling, valuing or financing a business.
Sources and useful references
ICAEW: Financial due diligence and business valuation guidance
Companies House / GOV.UK: Get information about a company
GOV.UK: Corporation Tax — allowable business expenses
GOV.UK: Business Asset Disposal Relief
FRS 102: The Financial Reporting Standard applicable in the UK