First Acquisition: Ten Mistakes to Avoid
Most first acquisitions do not go wrong on the spreadsheet. The model balances, the multiple looks defensible, the funding is in place — and then, six months after completion, the earnings the whole deal was priced on are not there. The reason is almost never a number the buyer got wrong. It is a judgement they never made: about whether the value would survive a change of ownership, whether the people who produced it would stay, whether the customers were the company's or the founder's. The first acquisition is where operators learn that the risk lives in the things the diligence spreadsheet was never designed to capture.
This guide is for UK operators and acquirers — multi-entity buyers in particular — making a first acquisition or building the discipline to make many. It works through the ten mistakes that most reliably undo a first-time buyer, each paired with the fix. None of them is exotic. They are the ordinary traps that a disciplined process avoids and an opportunistic one walks straight into. It is the risk companion to the wider buying a business hub: that hub tells you how to buy well, and this one tells you how not to buy badly.
1. Overpaying on a headline multiple without testing the earnings
The most common first-acquisition mistake is also the most expensive: paying a multiple of a profit figure that will not survive your ownership. A seller presents a number — last year's EBITDA, or an adjusted version of it — and the buyer, anchored to it, spends all their energy negotiating the multiple and none testing the base. But a multiple of the wrong number is just a faster way to overpay.
The presented profit almost always flatters. It carries a below-market founder salary that a hired replacement will cost more. It has personal expenses run through the company, one-off gains dressed as recurring, related-party rent that will not survive the sale, and deferred maintenance that will land on your watch. Multiply any of that and you are compounding an error rather than a fact.
The fix: Normalise the earnings before you multiply them, and apply adjustments in both directions — not just the add-backs that lift the number. Run a Quality of Earnings review that asks not "how much did they earn?" but "how confident am I this earning continues under me?" The mechanics are in how to value a business you want to buy. Price the business as it will run under you, not as it ran under a founder subsidising it.
2. Ignoring customer concentration and change-of-control clauses
A business with strong revenue and a fragile customer base is a very different asset from one with the same revenue spread across many accounts — but a headline multiple treats them identically. Concentration is the quiet killer of first acquisitions: two clients that are most of the revenue, a single contract that underwrites the margin, a relationship that lives in the founder's mobile phone rather than in a signed agreement.
Worse still are the clauses no one reads until it is too late. Many customer and supplier contracts contain a change of control provision that lets the counterparty terminate — or renegotiate — the moment the business changes hands. Buy a company for its contracted revenue, and discover on completion that the largest contract can be walked away from because you now own it, and you have paid for revenue that was never yours to keep.
The revenue most likely to disappear after completion is the revenue that was never contracted to the company in the first place — it was contracted to the founder, personally, through a relationship you cannot inherit. Ask to see the actual customer contracts, not a revenue schedule. Check every material one for a change-of-control clause, and treat concentration above roughly ten percent in a single client as a pricing question, not a footnote.
3. Under-scoping the intangible-asset diligence
Here is the diligence gap that most reliably costs a first-time buyer. Traditional diligence is exhaustive on the things that are easy to inspect — the accounts, the contracts, the property, the tax position — and near-silent on the things that actually produce the earnings. Yet roughly ninety percent of a modern private company's value is intangible: the customer relationships, brand, people, processes, data and IP that the statutory accounts barely record.
When you pay seven times earnings, you are not buying seven years of profit — you are buying the intangible assets that generate it. If those assets transfer cleanly, the multiple is earned. If they walk out of the door on completion, you have paid a premium for earnings about to evaporate. The lens we use to test this systematically is The Opagio 12 — twelve intangible value drivers, each of which becomes a question about whether the value transfers to you or stays with the seller.
The fix: Scope the intangible assets as deliberately as you scope the accounts. For every material driver — customer capital, human capital, brand, IP, documented process — ask whether it is owned and transferable or personal and portable. This is not a soft exercise bolted on after pricing; it is the thing that tells you whether your multiple is defensible. Go deeper in the acquisition due diligence checklist and, for the asset-level treatment, how to audit intangible assets in M&A.
4. Buying without an integration plan
A first-time buyer's attention is almost entirely consumed by getting to completion. The negotiation, the funding, the legals, the diligence — all of it points at signing, and the day after completion arrives as an afterthought. That is exactly backwards. The deal does not create value; the integration does. A target bought well and integrated badly destroys more value than a fair price ever protected.
Integration risk is highest where it is least visible: in the Culture & Ways of Working that no diligence spreadsheet captures, in the undocumented processes that only work because the same people have always run them, and in the systems that have to be merged before the two businesses can operate as one.
The fix: Write the first version of the integration plan before completion, not after. Decide what stays, what merges, who owns each workstream, and what the first hundred days look like. A documented, integratable target — one with real Organisational Capital — is worth more precisely because you can realise the value of the combination without breaking what you bought.
5. Over-leveraging the deal
Debt makes an acquisition possible and, taken too far, makes it fragile. A first-time buyer, keen to preserve equity, loads the deal with as much borrowing as a lender will provide — and in doing so removes all the tolerance the business needs to absorb the surprises that every acquisition produces. The integration costs more than modelled, a key customer wobbles, working capital tightens, and the debt service that looked comfortable at completion becomes the thing that dictates every decision.
The danger compounds when the earnings the debt was sized against turn out to be softer than the presented accounts suggested — which returns us, again, to mistake one. Leverage sized against optimistic earnings is leverage sized against a number that was never real.
In the UK, acquisition finance for SMEs runs well beyond senior bank debt — asset-based lending, vendor loan notes that keep the seller invested in the outcome, and IP-backed lending, where the target's own intangible assets serve as security. A structure that shares risk with the seller and rests on evidenced assets is more resilient than one that maximises third-party debt. See how to finance a business acquisition for the full range.
6. Mis-structuring the earn-out
The earn-out is the instrument first-time buyers reach for to bridge a valuation gap, and the one they most often get wrong. Structured well, an earn-out aligns the seller with the future they are promising — the higher price is paid only if the performance that justified it materialises. Structured badly, it becomes a source of dispute that poisons the very integration it was meant to protect.
The classic errors are all about definition. Tie the earn-out to a metric the seller no longer controls once you own the business, and you invite conflict. Base it on a profit figure you can influence through your own accounting choices, and you invite mistrust. Set the period too long, and you keep the seller half-in the business precisely when you need to integrate it.
The fix: Anchor the earn-out to the specific risk you are hedging. If your worry is that two key clients might leave, base it on the retention of those clients, not on a group profit line the seller cannot see. Define the measurement precisely, keep the period short enough to allow integration, and make sure both sides can independently verify the number. An earn-out is a way to make the seller prove the value they claimed — not a way to defer a fight.
7. Skipping reverse due diligence
Diligence is usually understood as a one-way inspection: the buyer examines the target. But the target — and its people, customers and lenders — are also, whether formally or not, forming a view of the buyer. First-time acquirers frequently overlook this entirely, and are surprised when a key manager resigns, a lender balks, or a landlord withholds consent, because the other side never got comfortable with them.
Reverse Due Diligence is the discipline of anticipating and answering the questions the other side is asking about you: can this buyer fund the deal, will they honour the earn-out, are they a credible custodian of the business and its people? For a first acquisition especially — where you have no track record to point to — this is not a nicety. It is the difference between a smooth completion and a deal that stalls at the point of consent.
The fix: Prepare your own side of the story as carefully as you scrutinise theirs. Have your funding evidenced, your intentions for the business clear, and your answers ready for the key people whose retention the value depends on. The value of a target is partly a function of whether its people believe in the buyer.
8. Mishandling key-person retention
Every acquisition has at least one person whose departure would undo a meaningful part of the value — the founder who holds every client relationship, the technical lead whose knowledge is undocumented, the operations manager who is the only one who knows how the business actually runs. First-time buyers routinely price the earnings without pricing the risk that the people producing them leave.
The mistake takes two forms. The first is failing to identify the Human Capital dependency at all — buying a business as though its earnings were a machine rather than a group of people who can walk out. The second is identifying it but doing nothing structural about it: no retention package, no earn-out tied to the right individuals, no handover plan, no incentive for the people who matter to stay through the transition.
A single departing key person can undo a whole multiple of value on day one. Identify who the earnings genuinely depend on during diligence, work out what it costs to retain them under your ownership, and build that cost — and the structure to secure it — into the deal before you sign. Retention is not an HR task to sort out after completion; it is a valuation input.
9. Buying on synergies you have not earned
The temptation to justify a stretch price with the value the combination will create is almost irresistible to a first-time buyer who wants the deal to happen. Synergy Value is real — cost savings, cross-selling, capacity you no longer have to build — but the discipline that keeps acquirers out of trouble is simple to state and hard to obey: base the valuation on standalone value, treat the combination benefit as your upside, and never hand the whole of it to the seller in the price.
The moment you pay the seller for the value your own business creates, you have transferred to them the reward for work you did — the platform those savings depend on was yours, not theirs. And the benefits most often used to justify a stretch price are the least certain kind: the extra revenue the combined business will supposedly win, which arrives later and smaller than the model says, if it arrives at all.
The fix: Underwrite the deal on standalone value and on the cost savings you directly control. Treat revenue upside as a bonus you did not pay for. If a deal only makes sense once you price in the combination benefit, you are not paying a full price — you are paying an optimistic one.
10. Weak deal origination
The last mistake sits at the very start, before diligence or pricing enter the picture. A first-time buyer with no origination process buys whatever comes across the desk — the business a broker is marketing, the one a contact happens to mention — rather than the business that fits a thesis. Weak Deal Origination means competing in an auction for a business everyone else has also seen, at a price the process has already inflated, for a target that may not fit at all.
The buyers who acquire well do the opposite. They know what they are looking for before they look — the sector, the size, the intangible characteristics that would make a target genuinely worth more inside their business than outside it — and they build proprietary flow so they are talking to sellers before a competitive process forms.
A multi-entity operator wanted to grow by acquisition but kept losing auctions to buyers willing to pay more. Rather than keep bidding, they defined a narrow thesis — regional operators with contracted recurring revenue and documented processes that would integrate cleanly into their existing platform — and approached a shortlist directly. The first deal they closed was off-market, at a lower multiple than the auctions had been reaching, precisely because they were the only buyer at the table. The discipline that produced that outcome is set out in how to find a business to buy.
The mistakes and the fixes, at a glance
Ten first acquisition mistakes and how to avoid each
| # | Mistake | The fix |
|---|---|---|
| 1 | Overpaying on a headline multiple | Normalise earnings first; run a quality-of-earnings review before you multiply |
| 2 | Ignoring concentration and change-of-control | Read the contracts; treat concentration and termination clauses as pricing questions |
| 3 | Under-scoping intangible diligence | Scope the intangible assets as deliberately as the accounts, driver by driver |
| 4 | No integration plan | Write the first plan before completion; value integratable targets more |
| 5 | Over-leveraging | Size debt against normalised earnings; share risk with the seller |
| 6 | Mis-structuring the earn-out | Anchor to the specific risk; define the metric precisely; keep it short |
| 7 | Skipping reverse due diligence | Prepare your own story for the people, lenders and counterparties assessing you |
| 8 | Mishandling key-person retention | Identify the dependency in diligence; price and structure retention before signing |
| 9 | Buying on unearned synergies | Underwrite on standalone value and cost savings you control |
| 10 | Weak deal origination | Define a thesis first; build proprietary, off-market flow |
Read the table and a pattern emerges. Almost every mistake is a failure to test whether the value being paid for is real and transferable — and almost every one of those tests is a question about intangible assets. The earnings, the customers, the people, the processes, the combination benefit: these are the things the accounts do not show and the standard diligence pack under-scopes, and they are where a first acquisition is won or lost.
See a target's intangibles before you pay for them
Opagio Intangibles is built to run exactly this test on an acquisition target. It identifies and classifies the target's intangible assets across Opagio 12, values them with recognised methods, and flags transferability and change-of-control risk — producing the Opagio Value Drivers Register™, the evidence base for your valuation. For multi-entity operators, it compares intangible strength across the group so you can prioritise which deals to pursue. See how Opagio Intangibles values a target's intangibles.
Putting it together
None of these ten mistakes requires a rare insight to avoid. Each is the ordinary consequence of a deal driven by momentum rather than discipline — a buyer who wants the acquisition to happen more than they want to know whether it should. The fix, in every case, is the same instinct applied earlier: test the value before you pay for it, structure the deal around the risks you have actually identified, and treat the intangible assets producing the earnings as the thing you are really buying.
A first acquisition made this way is not slower or more timid — it is simply better underwritten. You still move quickly, still compete, still close. You just do it knowing which of your assumptions are evidenced and which are hopes, and you price and structure accordingly. That is the whole difference between an acquirer who grows by buying well and one who spends the second year fixing the first deal.
If you are earlier in the journey, start with the buying a business hub, the acquisition due diligence checklist, and how to finance a business acquisition. When you have a target and need to know whether the value you are pricing is real and transferable, see how Opagio Intangibles values a target's intangibles — or review pricing — and put a defensible number on the deal before you commit to it. For the questions first-time buyers ask most, see how do I buy a business.
Ivan Gowan is Founder and CEO of Opagio. He spent twenty-five years in fintech, including at IG Group, before building Opagio to help operators see and evidence the intangible value in the businesses they own — and the ones they are about to buy. Meet the team.
Run the diligence
Most of what you are paying for is intangible — and invisible on the seller’s accounts. Verify it before you complete.
A 20-second read on your target — can you answer all three?
- Check the target’s intangible risk Concentration, chain of title, change-of-control — the value that does not transfer.
- Scope the diligence workstream → The operator’s checklist across financial, legal, commercial and intangible assets.
- Model the target in Opagio Intangibles Classify its intangibles, model the PPA pre-completion, compare across your group.
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