Selling a family business is a once-in-a-lifetime decision. These are the ten mistakes we have seen repeated over more than fifteen years analysing transactions in the Spanish middle market, and how to avoid them.
In more than fifteen years of analysing acquisition opportunities in the Spanish middle market, we have seen the same mistakes repeat themselves with remarkable consistency. These are not theoretical risks — they are patterns we observe in real transactions, with real consequences for the business owners involved.
The best time to prepare for a sale is two to three years before you intend to sell. Yet most business owners begin the process only when external pressure — health, fatigue, market conditions, family conflict — forces their hand. By that point, there is no time to optimise the financials, professionalise the management, or address the issues that will inevitably surface during due diligence.
Your company is not worth what you have invested in it, what it means to you emotionally, or what your golf partner told you his company sold for. It is worth what a qualified buyer will pay, based on its financial performance, market position, and risk profile. The gap between emotional valuation and market reality is the single biggest source of frustration and failed transactions.
Family businesses often run personal expenses through the company, pay above-market salaries to family members, or include one-off items that distort the true earnings. Failing to normalise the EBITDA — and document the adjustments transparently — means you are negotiating on the wrong number.
When employees, customers, or suppliers learn about a potential sale before the deal is secure, the consequences can be devastating: key employees start looking for alternatives, customers begin hedging their bets, and competitors exploit the uncertainty. Confidentiality must be maintained until the transaction is closed or nearly so.
A business owner who negotiates their own sale is like a patient who performs their own surgery. The buyer does this for a living. You do not. An experienced M&A advisor, corporate lawyer, and tax specialist are not optional — they are essential.
A higher headline price with aggressive earn-out conditions, broad warranties, and restrictive non-compete clauses may yield a worse net outcome than a lower price with clean terms. The structure of the deal often matters more than the number.
A letter of intent with conditions like “subject to satisfactory due diligence at the buyer’s sole discretion” is not a deal — it is a free option for the buyer. Every condition should be specific, measurable, and time-bound.
Missing or disorganised documentation is the number-one cause of due diligence delays, price adjustments, and deal failures. The investment in preparing a thorough data room pays for itself many times over.
The tax structure of the transaction can represent several percentage points of the net proceeds. Planning the tax aspects in advance — not as an afterthought — can save hundreds of thousands of euros.
Not all buyers are created equal. A buyer who pays the highest price but dismantles the team, destroys the culture, and abandons the company’s legacy may not be the right choice — particularly for a business owner who cares about what happens after the sale.
Every one of these mistakes is avoidable. The common thread is preparation: business owners who prepare thoroughly, engage professional advisors, manage expectations realistically, and approach the process with patience consistently achieve better outcomes. Selling a family business is a once-in-a-lifetime event. Treating it with the seriousness and diligence it deserves is the best investment you can make.
Founder of Blue Mountain
Over 15 years investing in Spanish companies with patient capital. Expert in business succession, corporate governance, and middle-market investment.
By Blue Mountain Capital
By Dirk Manuel Martens Jiménez
By Dirk Manuel Martens Jiménez
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