An Overview of Financial Due Diligence in the Mergers & Acquisitions Process

Buying or selling a business is rarely as simple as agreeing on a number and shaking hands. Behind every successful M&A deal is a financial process that can be very complicated and long. For business owners in DuPage County considering a sale, purchase, or merger in 2026, financial due diligence is the process that reveals what is actually happening underneath a company’s reported numbers before money changes hands.

If you are considering buying or selling a business in Illinois, having the help of an experienced Naperville business law attorney is essential. At Gierach Law Firm, we provide exactly that. 

What Is Financial Due Diligence in a Merger or Acquisition?

Financial due diligence is a detailed review of a company’s financial condition. It’s done before a business is bought, sold, or merged with another company. Financial due diligence looks closely at revenue, profitability, debt, and the full picture of a company’s financial records to confirm that what is being represented about the business matches financial reality. The goal is to give both sides of a transaction an accurate picture of the company’s finances before anyone commits to a final price or signs a purchase agreement.

Financial due diligence is essential because the purchase price of a business can’t be based on guesswork or the optimistic financial goals of the seller. Rather, it is tied to specific financial metrics. If those metrics turn out to be inflated, incomplete, or simply wrong, the buyer can end up overpaying or dealing with major problems down the road. 

How Is Financial Due Diligence Different From an Audit?

An audit is a formal review conducted regularly (usually once a year or so) to confirm that a company’s financial statements are in line with accounting standards. Audits may be required by law, depending on a company’s size and structure.

Financial due diligence is not required by law. Instead, it is voluntary, transaction-specific, and typically happens only once to get information for a particular deal. Rather than just confirming compliance with accounting rules, due diligence looks at whether the information a business claims about its finances are accurate, and whether those finances support the price being discussed.

What Do Buyers Typically Look For During Financial Due Diligence?

A due diligence review generally focuses on a handful of core financial questions, though the specific scope depends on the size and industry of the business.

Earnings and Cash Flow

Buyers need to know how much money the business actually generates from its operations, not just what appears on a financial statement. This often involves recalculating earnings before interest, taxes, depreciation, and amortization, commonly known as EBITDA, to remove one-time or unusual items that do not reflect a business’s true, consistent performance.

Working Capital

Working capital refers to the cash and short-term assets a business needs on hand to keep running day to day, such as inventory and accounts receivable, minus its short-term obligations. Buyers and sellers frequently negotiate a target working capital amount that should be in place at closing, since too little can leave a new owner scrambling to cover basic expenses.

Debt and Liabilities

A thorough review also identifies all outstanding debt. This includes obligations that may not appear clearly on a balance sheet, such as certain leases or pending legal claims. Understanding the true debt load of a business is essential to determining what the company is actually worth after those obligations are accounted for.

Looking at Due Diligence from the Seller’s Point of View  

Financial due diligence is often thought of as something only a buyer needs, but sellers benefit from it as well in the following ways: 

• Identifying financial risks or liabilities before they affect the closing
• Supporting a more accurate and defensible purchase price
• Giving both parties a shared understanding of the company’s financial condition
• Informing the specific terms of the purchase agreement, including any warranties or price adjustments
• Helping the buyer plan for the business’s finances after the deal closes

A seller who understands their own financial position ahead of time can address problems before they surface during negotiations, which can prevent last minute price reductions or a deal falling apart. Sellers who prepare their own financial review in advance are often able to move through the process more efficiently once a buyer’s team begins its own analysis.

What Are Some Common Challenges of Financial Due Diligence?

Financial due diligence does not always go smoothly, so Illinois business owners should be prepared for a few common obstacles. Companies with incomplete or disorganized financial records can make it difficult for a due diligence team to verify figures with confidence. Deals are also often conducted on tight timelines, which can limit how thoroughly certain issues get examined. When a business has multiple entities, out of state operations, or complex ownership structures, coordinating the review across all of those pieces takes time and legal attention.

For example, under the Illinois Business Corporation Act of 1983, a merger involving an Illinois corporation generally requires approval from the board of directors and a vote of the shareholders before the transaction can be completed. For larger transactions, federal law can come into play as well. 

How Does Due Diligence Affect the Final Purchase Agreement?

Unsurprisingly, the findings from a financial due diligence review usually affect the purchase agreement. If problems are discovered, such as understated liabilities or inflated earnings, the parties may renegotiate the price. They also might add specific warranties about the accuracy of financial statements, or include indemnification provisions that protect the buyer if a hidden problem surfaces later. These terms are absolutely essential because they determine who bears financial responsibility if something was missed or misrepresented during the deal.

Contact a Naperville Business Law Attorney Today

Financial due diligence can determine whether an M&A deal closes smoothly or runs into expensive and unpleasant surprises. Denice Gierach is a local DuPage County business law attorney, Certified Public Accountant, and holds a Master’s Degree in Management from Northwestern University. She has more than 30 years of experience guiding business owners and shareholders through complicated transactions. 

Call Gierach Law Firm at 630-756-1160 to talk through your upcoming deal with an experienced Naperville, IL business law attorney.