The Importance of a Due Diligence Process: Even for Modest Transactions

ARTICLE | February 26, 2026

When business owners hear “due diligence,” they may envision a team of lawyers and accountants scrutinizing a multimillion-dollar merger. In reality every business transaction, regardless of size, carries risk, and a structured due diligence process is one of the most effective ways to protect your organization before the deal is signed.

Whether acquiring a small business or entering a strategic partnership, skipping due diligence because a deal seems modest is one of the most common and  costly mistakes a business owner can make.

Small Deals Can Carry Big Risks

Smaller transactions often involve narrower margins, which means any unexpected liability and unfavorable margin trend can undermine the business case. Unlike large enterprises with deep reserves, small businesses typically operate with tighter cash flow and fewer recovery options. A single bad deal can consume a disproportionate share of working capital and stall growth for months or even years.

The risks in smaller deals are also easy to overlook precisely because the deal feels manageable. Unverified financials, informal agreements, limited documentation, and heavy dependence on a handful of customers or suppliers are all common in smaller transactions and are all capable of creating serious problems if left unexamined. A basic due diligence process surfaces these issues before they become expensive surprises.

“In a recent deal, we identified that the target had a margin deterioration trend caused by the pricing with the largest client. This changed EBITDA projections by more than 50%, which meant the buyer would have defaulted on debt covenants.” Ann Montgomery, Insero Advisors

What a Due Diligence Process Actually Covers

A well-executed due diligence process is not just about identifying what could go wrong. It also provides valuable information that improves your negotiating position and sets the stage for a successful transition. Key areas to review include:

• Financial health: Quality of revenue, cash flow patterns, outstanding liabilities, and the accuracy of reported earnings
• Legal and compliance matters: Pending or potential litigation, licensing requirements, employment law compliance, and tax obligations
• Operational factors: Technology systems, vendor and customer contracts, and any dependencies that could affect continuity
• People and culture: Key employee relationships, compensation and benefit arrangements, and potential integration challenges

Knowing the answers to these questions allows you to negotiate price adjustments, request seller warranties, add protective contract terms, and plan for integration needs, all of which can substantially shift the economics of a deal.

Due Diligence Does Not Have to Be Complicated

A common reason businesses skip due diligence on smaller deals is the assumption that a thorough review requires an expensive advisory team and weeks of work. In practice, the process is scalable. A right-sized approach for a modest transaction might include a streamlined financial review, a straightforward legal and HR checklist, a brief conversation with key customers or vendors, and a basic assessment of technology and data practices. Even a few hours of structured investigation can prevent major missteps.

The goal is not to overcomplicate the process; it is to make sure you know what you are buying before you commit.
“In our experience, the investment in due diligence is more than offset by reductions in purchase price and avoidance of potential losses.”
Ann Montgomery, Insero Advisors

The Added Value: Building Trust and a Roadmap for Success

A structured due diligence process does more than protect against downside risk. It also builds trust between the parties involved. Sellers who are well-prepared for the process demonstrate professionalism and reliability. Buyers who approach it with care and transparency signal seriousness and integrity. That foundation tends to produce smoother transitions and stronger long-term outcomes for everyone involved.

Beyond the transaction itself, the information gathered during due diligence becomes a roadmap for integration. It helps identify operational synergies, technology gaps, and areas where additional investment may be needed, all of which are critical to generating meaningful returns from even a modest acquisition.

How Insero Can Help

At Insero Advisors, we understand that growth-minded businesses need more than compliance support; they need trusted advisors who bring genuine insight to every stage of a transaction. Our team has deep experience across financial analysis, tax, and advisory services, and we work closely with clients to ensure that every deal they pursue is built on a clear, accurate picture of what they are acquiring.

Whether you are approaching your first acquisition or adding to a portfolio of strategic investments, we bring the same commitment to thoroughness and client service that has defined our work for more than 50 years.

Ready to approach your next transaction with confidence? Contact Insero Advisors to speak with one of our advisors about building a due diligence process that is right for your situation.