Offers & due diligence
6 Critically Important Aspects of Due Diligence
The six areas buyers examine in due diligence, what they look for in each, and how an annual self-review keeps you ready to sell.
By Michael D. Rubin, CEO & Founder · Updated September 2026 · 852 words
The six areas buyers examine most closely in due diligence are legal matters, market position, environmental issues, operations, finances and people, and the owners who fare best review all six every year, whether or not they plan to sell. Due diligence is the buyer's detailed check of your business after a letter of intent is signed. Problems found there lead to price cuts, tougher terms or a deal that dies.
An annual self-review turns due diligence from a threat into a formality, and it leaves you ready if an unexpected buyer, a health issue or a partner dispute makes a sale necessary sooner than planned.
The six areas at a glance
| Area | What buyers check | What to do now |
|---|---|---|
| Legal | Contracts, leases, licenses, intellectual property, litigation | Update expired agreements, register trademarks, resolve disputes where possible |
| Market | Industry position, competitors, customer base, risks | Be ready to explain where the company stands and where the market is heading |
| Environmental | Contamination, permits, hazardous materials, compliance history | Know your site history; fix issues or document them |
| Operations | How work flows from order to delivery, systems, equipment | Write down key processes so they do not live in one person's head |
| Financial | Statements, tax returns, receivables, payables, inventory, add-backs | Reconcile the books to the returns; clean up old receivables and inventory |
| People | Management depth, key employees, pay, employment practices | Build a second layer of management; document policies and agreements |
Legal and environmental: the deal-breakers
Legal issues are where the buyer's attorneys spend their time. They will read customer and supplier contracts for change-of-control clauses, check that leases can be assigned, confirm licenses and permits are current, and look for any patent, trademark or copyright the company does not clearly own. Pending or threatened litigation is the item most likely to stall a deal; resolve it before a sale if you can, and if you cannot, disclose it early with your attorney's assessment. Think about what your own lawyer would demand to see if you were the buyer, and gather it now.
Environmental problems can end a deal outright or leave the seller responsible for cleanup long after closing. Buyers and their lenders often order an environmental site assessment for any property involved, especially in manufacturing or wherever chemicals, fuels or solvents are used, and our work with manufacturing companies regularly includes it. Knowing your site's history, and dealing with any known issue before a buyer finds it, is far cheaper than negotiating from surprise.
Financial and operational: clarity wins
Nothing about the finances should feel mysterious to a buyer. Your financial statements should reconcile with your tax returns, and every adjustment you ask a buyer to accept should be documented. Receivables should be current or explained, payables paid on normal terms, and inventory counted and valued the same way each year. The same clarity applies to operations: a buyer should be able to see how an order becomes a delivered product or completed service, which systems track it, and who is responsible at each step. A list of what to gather is in documents to organize before selling your business.
Market and people: can the business thrive without you?
Buyers want to know that the owner understands the market: who leads the industry, how large the market is, who the customers are now and who they are likely to be, and what could help or hurt the company's products and services. An owner who can explain this plainly shows that the company's position is understood, not assumed.
The people review asks a harder question: will the business run without its owner? Buyers look at the depth of the management team, the loyalty and pay of key employees, turnover, and whether employment policies and records are in order. Problems here, such as a single manager who knows everything or a history of disputes, are among the most expensive to discover late. They are also among the slowest to fix, which is why owners working with pre-exit consulting often start here.
Make the review an annual habit
Set a date each year, perhaps alongside your tax filing, to go through all six areas with your CPA and attorney. Write down what you found and what you fixed. Over a few years the file becomes your due diligence package, and the business becomes easier to run as well as easier to sell. Most of the common causes of failed deals, covered in what causes a business sale to fall apart in due diligence, are visible in a review like this long before a buyer arrives. You may not plan to sell this year, but nobody can promise that a sale will never be forced on them.
How MDR & Associates prepares owners for diligence
MDR & Associates reviews three years of financials in the free discovery meeting and flags the issues a buyer is likely to raise. Once engaged, the firm manages due diligence alongside your attorney and CPA, keeping requests organized and answers consistent so that the buyer's review confirms what the marketing package said. For a first view of where your company stands, begin with the free valuation snapshot.
Where this fitsHow a business sale works, step by step →
Questions owners ask next
How long does due diligence usually take?
For an established company it commonly runs from several weeks to a few months, depending on the buyer, its lender and how organized your records are. Owners who have their documents ready shorten it, and a shorter diligence period gives the buyer less time to find reasons to renegotiate.
Should I pay for a review of my own earnings before going to market?
For larger or more complex companies it can pay off. A quality-of-earnings review by an outside accounting firm tests your earnings the way a buyer's accountants will, so surprises appear on your timeline rather than theirs. Your CPA and M&A advisor can tell you whether your size and records justify the cost.