Why Margins Fade Post-Acquisition

I stay in touch with former clients and friends who are now on the other side of the deal, actively operating their businesses. A recurring theme in those conversations is margin compression within the first 12 months after closing. Given the pressure many operators are facing today from labor, insurance, interest costs, and slower customer spending, I figured this would be a good time to discuss why margins compress post-acquisition and what prospective buyers can do to mitigate this. To understand how this happens, it helps to walk through a fairly ordinary acquisition. Just a good business purchased by a rational buyer under assumptions that quietly proved too optimistic. Suppose you acquire an electrical power systems company that designs and installs power distribution and control systems for data centers, mining operations, and energy facilities. Complex, technical work with real switching costs. The CIM shows 22% EBITDA margins, the financials are clean, backlog is strong, and the management team plans to stay. The seller has operated the business for over twenty years and built a reputation that customers trust. You pay 5.5x EBITDA, financed conservatively at roughly 3x leverage. After closing, you execute the transition carefully. You meet key customers, retain employees, maintain pricing discipline, and avoid the temptation to “improve” things too quickly. Twelve months later, the business is still growing. Revenue is up 8%. Customers and employees stayed, plus the backlog remains healthy. Yet EBITDA margins, which looked so attractive in the CIM at 22%, are now closer to 17%. I have seen versions of this story enough times to know that it usually does not happen because the buyer was reckless. In many cases, the buyer operated the business responsibly and changed very little. The surprise comes from discovering that some portion of the historical margin belonged not to the business itself, but to the person who owned it. The founder of our hypothetical company spent twenty years building trust with customers, suppliers, and employees. She knew which customer would tolerate a delayed delivery and which would not. Also knew which supplier would push an order through during shortages, knew when to hold price, when to bend, and when to call in a favor. An ownership transition also has a way of waking people up. Customers who barely thought about your company suddenly receive onboarding forms, updated wiring instructions, and introduction calls from new management. Procurement departments revisit vendor relationships. Suppliers reassess pricing and payment terms. A relationship that operated on familiarity for twenty years becomes a relationship that now needs to be reconsidered. In our example, the company purchases transformers, switchgear, and automation equipment from ABB, Schneider Electric, and Eaton. These are relationship businesses disguised as industrial businesses. Lead times matter, allocation matters, and pricing often depend on history as much as volume. The founder had been buying from the same regional representatives for over fifteen years. During diligence, the supplier relationships appeared solid. Introductory calls were made, everyone was polite, and nothing suggested trouble ahead. But six months after closing, pricing slowly drifted upward toward standard market rates. Priority allocation during shortages became less automatic. What’s more dangerous is how quietly all this can happen, you won’t get an angry phone call, or a dramatic fallout as a heads up of what’s to come. The business will simply stop receiving the small advantages it had quietly accumulated over decades. The same thing can happen with customers. Under the previous owner, small service issues may have been overlooked because the relationship carried enough goodwill to absorb them. Under new ownership, those same issues become discussion points. Customers begin requesting competitive bids. Payment cycles stretch. Pricing negotiations become slightly more difficult. None of these changes individually threaten the company but together, they compress margins surprisingly fast. I also think buyers sometimes overestimate how transferable a business becomes simply because the owner appears “low-touch.” Even owners who are no longer involved in day-to-day operations often provide something valuable: familiarity. Customers know them. Suppliers trust them. Employees are accustomed to them. That goodwill may not be obvious during diligence, but it often reveals itself after the transition. This is one reason I have become skeptical whenever I see buyers underwrite small businesses as though margins are perfectly transferable. Some businesses truly possess structural advantages that survive ownership change, those advantages are real, but they are also fragile. In a nutshell, think of it this way: some portion of profit margins are attributable to owner goodwill. So, buyers should recognize what they are actually purchasing and structure accordingly. Conservative leverage helps. Smarter questions during diligence help. This is where your deal team becomes essential. Longer seller transition periods help. Retaining key employees helps. Most importantly, buyers should leave room for the possibility that the first year under new ownership may look a little different from the last year under the old one. Margins, like reputations, usually take years to build and only a short period of disruption to weaken.