Summary
Understand what quality of earnings really means in a private acquisition and why normalised EBITDA alone is not enough. Learn how to evaluate revenue reliability, margin sustainability, customer concentration, cost structures, and add-backs to determine whether a business’s earnings are truly repeatable and worth the price you are paying.
If you ask most search funders what quality of earnings means, they will tell you it is about adjusting the EBITDA figure. Removing the owner’s personal expenses. Adding back the one-off costs. Arriving at a normalised number that reflects what the business actually earns under normal operating conditions.
That answer is not wrong. But it is incomplete in a way that matters enormously for how much you pay and what you actually get.
Quality of earnings is not just a number. It is an assessment of how reliable, how repeatable, and how genuinely representative of the future the current earnings figure actually is. Two businesses can have identical normalised EBITDA figures and completely different quality of earnings profiles. One earns its EBITDA through long-term contracts with diversified customers, stable margins, and predictable cost structures. The other earns the same number through a single large project that will not recur, a customer base that is heavily concentrated around one relationship, and margins that have been quietly compressing for three years. The headline figure is the same. The quality behind it is not.
Getting quality of earnings right is the single most important analytical task in a private acquisition because everything else in the deal is sized against it. The price is a multiple of it. The debt is sized against it. The earnout is structured around it. If the number is wrong, or right but of poor quality, every downstream decision built on it is also wrong.
In this article
- Why quality of earnings is more than a normalised EBITDA calculation
- The difference between EBITDA normalisation and true earnings quality assessment
- How to evaluate revenue quality and customer dependency risks
- Why gross margin trends reveal hidden earnings risks
- How to challenge seller add-backs during due diligence
- How quality of earnings affects valuation, deal structure, and investment risk
- How Kudra helps buyers assess earnings quality during acquisition due diligence
The Difference Between Normalisation and Quality Assessment
Most due diligence processes do normalisation. Fewer do a genuine quality of earnings assessment, and the distinction between the two is where most of the analytical risk in private acquisition actually lives.
Normalisation adjusts the reported EBITDA for items that distort the run rate figure. Owner compensation above or below market replacement cost. One-off costs that genuinely will not recur. Related-party arrangements at non-market terms. Below-market rent paid to a property the owner holds personally. These adjustments produce a normalised figure that better represents what the business would earn under new, arm’s-length ownership. Normalisation is necessary and important. It is also the part of the analysis that sellers and their advisers prepare most carefully, which means the normalisation the seller presents is almost always optimistic and requires independent testing rather than acceptance.
Quality assessment goes further. After normalisation, it asks whether the resulting number is actually reliable as a forward indicator. How much of the revenue is contracted versus discretionary? How concentrated is the customer base and what happens to the earnings figure if the largest customer leaves? Has the gross margin been stable or has it been compressing, and if compressing, why? Is the cost structure genuinely representative of what the business needs to operate, or have costs been deferred or suppressed in the period leading up to the sale? These questions do not change the normalised number. They determine how much confidence a buyer should have in that number as an indicator of what the business will actually earn under new ownership.
The Revenue Side of Quality of Earnings
Revenue quality is the dimension of quality of earnings that gets the most attention in larger transaction due diligence and the least in missing middle acquisitions, where it matters just as much and is often harder to assess from the available documentation.
The central question on the revenue side is how much of the current revenue figure will still be present in twelve months under new ownership, and under what conditions. This is not the same question as whether the revenue is contractually protected, though that matters. It is the broader question of what is holding the revenue in place and whether those factors are structural or personal.
Contracted revenue with long minimum terms and high switching costs is high quality revenue. It will persist through an ownership transition because the contractual and operational factors holding it in place are independent of who owns the business. Revenue that is held in place primarily by the owner’s personal relationships, daily involvement, or specific expertise is lower quality revenue, not because it will necessarily leave, but because the factors sustaining it are at risk from the transition itself. The two categories can produce identical historical figures. Only one of them produces reliable forward earnings under new ownership.
Revenue concentration is the other critical revenue quality dimension. A business where three customers represent 70 percent of revenue earns its EBITDA in a fundamentally different way from one where fifty customers represent the same figure. The concentrated business has higher earnings quality sensitivity, meaning a smaller number of decisions made by a smaller number of counterparties can produce a larger impact on the EBITDA figure. That sensitivity needs to be reflected in the multiple paid, the deal structure designed, and the transition plan built, none of which is possible without a specific, named understanding of which customers represent the concentration and what holds their relationships in place.
The Margin Side of Quality of Earnings
Gross margin stability is one of the most revealing indicators of earnings quality in a private business, and one of the most frequently underexamined in due diligence processes that focus primarily on the most recent year’s headline figures.
A gross margin that has been stable at 42 percent for five years is telling you something different from one that was 48 percent three years ago and is now 42 percent. Both produce the same current figure. One suggests a business with a stable cost structure and pricing position. The other suggests a business experiencing structural margin compression, from competitive pressure, rising input costs, or pricing power erosion, that has not yet finished working its way through the financials. The trend is the information. The current figure is just where the trend happens to be today.
Cost structure quality matters alongside margin trends. A business whose cost base has been kept artificially low through deferred maintenance, below-market compensation, or the suppression of costs that will normalise post sale is showing better current earnings than its sustainable operating cost structure would support. These suppressions are often not captured in a standard normalisation because they are not one-off costs in the traditional sense. They are systematic underinvestment that has inflated the margin figure for a period and will reverse under new ownership regardless of what the purchase agreement says.
| Quality of earnings dimension | High quality signal | Low quality signal |
|---|---|---|
| Revenue contractedness | Long-term contracts with minimum terms, documented switching costs, renewal history | Month-to-month or informal arrangements, no documented switching costs, high historical churn |
| Customer concentration | Diversified base where no single customer represents more than 10 to 15 percent of revenue | Top three customers representing more than 50 percent of revenue, particularly where relationships are owner-held |
| Gross margin trend | Stable or improving margin over three to five years with a consistent cost structure | Compressing margin over multiple years without a clear explanation that has already resolved |
| Cost structure sustainability | Market-rate compensation, regular maintenance investment, no deferred costs visible in the records | Below-market compensation, deferred capex, suppressed costs that will normalise post close |
| Revenue recurrence | High proportion of repeat revenue from an established customer base with low annual churn | Significant proportion of revenue from projects or arrangements that require active reselling each period |
The Add-Back Problem
Every quality of earnings conversation eventually arrives at the add-back schedule, and this is where the most consequential analytical disagreements between buyers and sellers tend to occur.
The seller’s add-back schedule presents adjustments that inflate the normalised EBITDA figure. Some are entirely legitimate. An owner who draws a salary of £180,000 in a role with a market replacement cost of £90,000 is genuinely adding back real earnings that would be available under arm’s length ownership. A legal settlement that appears once and has no predecessor in the historical accounts is genuinely non-recurring. These adjustments are defensible and a buyer who rejects them without reason is simply paying less than the business is worth.
But seller add-back schedules also regularly contain adjustments that are more aggressive than defensible. Costs described as one-off that appear in some form in multiple prior years. Owner compensation adjustments that assume a below-market replacement when the role actually requires more than the comparison suggests. Revenue or cost improvements described as already implemented when the evidence for their implementation is thin. Each of these inflates the normalised EBITDA figure, and each of them produces a purchase price, a debt structure, and an earnout that are sized against a number that is optimistically stated.
The only reliable way to assess the add-back schedule is to read every adjustment against the full historical financial record rather than against the seller’s description of it. A cost described as one-off looks different when the three prior years of accounts show a similar cost under a different description. A revenue improvement described as already implemented looks different when the most recent management accounts do not yet show the improvement in the gross margin line. The evidence is in the documents. Finding it requires reading all of them simultaneously rather than accepting the seller’s summary of what they say.
How Quality of Earnings Affects Everything Downstream
The reason quality of earnings is the most important number in the deal is not that it determines what you pay today. It is that it determines whether what you pay today is actually what you get tomorrow.
A business bought at seven times a high-quality EBITDA of £800,000 is a different investment from the same business bought at six times a low-quality EBITDA of £800,000. The lower multiple appears better value. It is not, if the quality assessment reveals that £200,000 of the earnings figure is dependent on a single customer relationship that is at risk from the transition, that £50,000 of the normalisation relies on an add-back that is not genuinely non-recurring, and that the gross margin has been compressing at two percentage points per year for three years with no structural resolution in sight. The real earnings of the business, under the conditions that will actually prevail post close, may be substantially lower than the normalised figure, and the apparent discount in the multiple does not compensate for that gap.
Kudra builds the quality of earnings assessment into the financial analysis from the start of the due diligence process rather than treating it as a separate exercise. Revenue quality, margin trend analysis, and add-back challenge are not parallel workstreams. They are connected analytical tasks that inform each other continuously as the evidence accumulates. The normalised EBITDA that emerges from a Kudra-supported analysis is not just a better number. It is a number with a specific quality assessment attached, so the buyer understands not just what the business earned but how much confidence to place in that figure as an indicator of what it will earn going forward.
