Due Diligence: What Buyers Will Ask For (And How to Be Ready)

Due Diligence When Selling a Business

You signed the LOI. The buyer is serious. Now comes the part that makes most sellers want to crawl under their desk: due diligence.

Due diligence is the buyer’s deep look into your business - the financials, operations, legal exposure, customers, employees, everything. It’s the most stressful phase of any deal, and the stage where more transactions die than any other. But if you know what’s coming and prepare for it, you’ll get through it with the deal intact and your sanity mostly preserved.

Here’s what to expect, what buyers will ask for, and what actually kills deals at this stage.

What Due Diligence Actually Is (And Isn’t)

Confirmatory vs. Exploratory Due Diligence

There are two versions of due diligence, and understanding which one you’re in makes a big difference.

Confirmatory due diligence is what happens in a well-run deal. The buyer has already seen your high-level financials, reviewed the CIM, asked their initial questions, and decided to make an offer based on what they know. Now they’re confirming that what you told them is accurate. The price and structure are already agreed to in the LOI. Barring surprises, the deal closes.

Exploratory due diligence is messier. The buyer hasn’t fully committed. They’re still deciding if they want the business at all, or they’ve left so much open in the LOI that due diligence becomes a second round of negotiation. This version is more common with less experienced buyers or poorly structured LOIs.

The distinction matters because confirmatory DD is a process you manage. Exploratory DD is a process that manages you. A good letter of intent locks down enough terms that due diligence stays confirmatory.

Why It Feels Like an Invasion (But Isn’t Personal)

Expect to feel exposed. A stranger is going to examine your financial records, question your accounting practices, interview your managers, and scrutinize decisions you made years ago. It will feel personal. It isn’t.

Buyers aren’t judging you. They’re protecting themselves. Every buyer who’s been burned by a bad acquisition does more thorough DD the next time. The detailed requests, the follow-up questions, the third-party audits - they’re a sign that the buyer is serious and has the resources to close. Casual buyers don’t hire accountants to run a Quality of Earnings analysis.

What Buyers Will Request

The specific documents vary by industry and deal size, but the categories are predictable.

Financial Documents (The Foundation)

This is where buyers spend the most time. Expect requests for:

• Three years of profit and loss statements, balance sheets, and cash flow statements
• Three years of federal and state tax returns
• Month-by-month revenue and expense detail for the current year and prior year
• Bank statements (usually 12-24 months)
• Accounts receivable and payable aging reports
• Debt schedules and loan agreements

If your books are clean, this part is straightforward. If they’re not, this is where deals start to unravel. Our guide on preparing your business for sale covers how to get your financial house in order before you ever go to market.

Customer and Revenue Data

Buyers want to understand where the money comes from and how stable it is.

• Revenue by customer (a sales-by-customer report showing your top 10-20 customers and their percentage of total revenue)
• Customer contracts, terms, and renewal rates
• Recurring vs. one-time revenue breakdown
• Sales pipeline and backlog

Customer concentration is one of the most sensitive areas. Under FASB accounting standards, any customer representing 10% or more of your revenue is classified as a “major customer” - and that’s where buyer scrutiny begins. If you have concentration at that level, the buyer will want to understand the relationship in detail: how long have they been a customer, is there a contract, what’s the renewal history, and what happens to the business if they leave.

Employee and HR Information

• Organization chart with key roles and compensation
• Employment agreements, non-competes, and offer letters
• Benefits summary (health insurance, retirement plans)
• Employee turnover history
• Key person dependencies

The buyer needs to know whether the team will stay after you leave. This connects directly to owner dependency - if the business can’t run without you, that’s a DD finding that affects the deal.

Legal and Compliance Records

• All material contracts (vendor agreements, leases, licenses)
• Pending or threatened litigation
• Regulatory compliance documentation
• Intellectual property (patents, trademarks, domain names)
• Insurance policies and claims history

Operational Documentation

• Standard operating procedures
• Technology systems and software licenses
• Facility details, equipment lists, and maintenance records
• Key vendor relationships and terms

Insurance and Property

• Property leases and terms
• Equipment leases
• Insurance policies (general liability, property, D&O, E&O)
• Any pending claims

The Data Room

What a Data Room Looks Like

A data room is a secure online repository where you organize and share documents with the buyer and their advisors. Think of it as a carefully organized filing cabinet that the buyer’s team can access without calling you every time they need something.

Most data rooms today are hosted on cloud platforms with access controls, activity tracking, and permission levels. The buyer’s attorney might have access to legal documents but not financial records. Their accountant sees the financials but not the customer contracts. Everything is tracked - you know exactly who looked at what and when.

Building Your Data Room Before You Go to Market

Ideally, the core of your data room is built before you ever go to market - not scrambled together after an LOI lands. Your broker handles the structure, organization, and access controls. Your job is gathering the documents and answering questions about them.

At Arx, we build and manage the data room as part of our process. We know what buyers and their advisors will ask for because we’ve been through this hundreds of times. We set up the categories, organize your documents, control who sees what, track activity, and handle the back-and-forth with the buyer’s team so you can focus on running your business.

A clean data room organized by category (financial, legal, operations, customers, HR) with a numbered index and consistent naming conventions tells the buyer something important: this is a well-run business with an owner who’s organized and serious. A messy data room full of mislabeled files and missing documents tells them the opposite - and it slows down due diligence, which increases deal fatigue risk.

The documents listed above shouldn’t surprise you if you’ve done your preparation work. Most of what the buyer requests during DD is information you should have gathered and organized before the first buyer conversation.

Timeline and What to Expect

The Typical 45-90 Day Process

Due diligence typically runs 45-90 days depending on the size and complexity of the deal. Simpler transactions on the lower end of our market can wrap up in 45 days. Deals with multiple locations, complex financials, or a Quality of Earnings analysis often run the full 90. Here’s the general flow:

Weeks 1-2: Data room setup and initial document delivery. The buyer’s team reviews what’s available and sends their first round of questions and document requests.

Weeks 2-4: Deep document review. Follow-up questions start flowing. Management interviews may be scheduled. The buyer’s accountants begin their financial analysis.

Weeks 4-6: Quality of Earnings analysis (if the buyer is doing one). Legal review intensifies. Issues surface and need resolution. Purchase agreement drafting may begin in parallel.

Weeks 6-8: Final issue resolution. Working capital estimates. Definitive agreement negotiation. Third-party consents in progress.

The key thing to understand: due diligence isn’t a linear path. It’s multiple workstreams happening simultaneously, with questions and requests coming from the buyer’s accountants, attorneys, and operating team all at once.

Quality of Earnings (QoE) Analysis

If the buyer is backed by a private equity firm or is using acquisition financing, expect a Quality of Earnings analysis. This is a detailed financial review conducted by a third-party accounting firm hired by the buyer.

A QoE goes deeper than a standard audit. The accountant will verify your revenue recognition practices, analyze the sustainability of your margins, test your add-backs, and assess whether your reported earnings are reliable and repeatable. It typically takes 3-4 weeks and costs the buyer $20,000 or more depending on the complexity of the business.

This is not something to fear if your financials are accurate. It’s actually a good sign - it means the buyer has the resources and sophistication to close a deal.

Why Speed Matters (Deal Fatigue Is Real)

Every week that due diligence drags on increases the risk that the deal dies. Not because anyone finds a problem, but because people get tired, distracted, and anxious. Buyers get cold feet. Lenders get nervous. Sellers get frustrated. This is called deal fatigue, and it’s one of the most common deal killers in the middle market.

The antidote is responsiveness. Answer questions quickly. Provide documents promptly. When you can’t find something, say so immediately and give a timeline for when you’ll have it. Silence is the enemy.

What Derails Deals at This Stage

Surprises (The #1 Deal Killer)

If the buyer discovers something material that you didn’t disclose - a pending lawsuit, a customer you’re about to lose, a tax issue, a regulatory problem - the deal is in serious trouble. Not necessarily because the issue itself is fatal, but because the buyer loses trust.

Sophisticated buyers can work around most problems if they know about them upfront. A pending lawsuit might reduce the price by $200K but not kill the deal. That same lawsuit discovered during DD, after the buyer feels they were misled? That kills the deal.

Disclose everything. Early. Confidentiality management is important, but once you’re under LOI, transparency with the buyer is more important than protecting information.

Slow Responses

When a buyer’s team sends a document request and waits a week for a response, they start assuming the worst. Are the documents being fabricated? Is the seller hiding something? Are they not committed to the deal?

Most of the time, the seller is just busy running their business. But perception matters. Set aside dedicated time each week for DD responses, or delegate to someone who can.

Getting Defensive

When a buyer questions your accounting practices or pushes back on an add-back, the natural reaction is to get defensive. Resist it. The buyer isn’t attacking you. They’re doing their job.

Approach every question as a legitimate inquiry deserving a factual answer. If a buyer asks why your margins dropped in Q3, explain what happened. Don’t take it as an accusation.

Financials That Don’t Match What You Claimed

The most common version of this: your add-backs don’t hold up. You told the buyer that $300K of personal expenses run through the business should be added back to arrive at true earnings. The buyer’s accountant digs in and decides half of those aren’t legitimate add-backs - that country club membership was entertaining clients, the second truck is used by employees, the family vacation wasn’t really a business trip. Now your adjusted EBITDA just dropped by $150K, and the buyer is recalculating the purchase price.

The gap between what you represented and what the documents support is the single most common reason deals re-trade or die. Not because the business is bad, but because the seller overstated earnings and the buyer feels misled.

This is why financial preparation matters so much. Get your numbers right - and be honest about what’s a real add-back and what isn’t - before you go to market, not during DD.

The Emotional Side of Due Diligence

Feeling Exposed and Judged

You built this business over years or decades. Now someone is going through it with a fine-tooth comb, questioning decisions you made, and assigning a dollar value to your life’s work. That’s heavy. It’s normal to feel vulnerable, even violated.

Remind yourself why this is happening: because someone wants to buy your business badly enough to spend tens of thousands of dollars verifying that it’s as good as you say it is. That’s not judgment. That’s validation.

The Temptation to Oversell

When buyers ask tough questions, the temptation is to spin. To put the best possible face on every answer. To explain away every dip in revenue or every customer loss.

Don’t. Buyers respect honesty. Every business has warts, and experienced buyers know that. The seller who says “yeah, we lost that customer because we dropped the ball on service, and here’s what we changed” is far more credible than the one who has a polished excuse for everything.

Staying Focused on Running the Business

Due diligence is a time sink. The requests, the meetings, the document hunting - it all takes time away from operations. And here’s the cruel irony: if your business performance dips during DD because you’re distracted, the buyer notices, and it becomes a DD finding.

Delegate what you can. Let your broker and attorney handle as much of the back-and-forth as possible. Block off specific times for DD responses rather than letting it consume every day. Your business needs to keep performing through the finish line.

How to Come Out the Other Side

Due diligence ends one of three ways: the deal moves to a definitive agreement and closing, the deal re-trades (price or terms change based on findings), or the deal dies.

The sellers who come out well share a few traits. They prepared their documents before going to market. They disclosed issues upfront rather than hoping they wouldn’t surface. They responded to requests quickly and calmly. And they had a team - broker, attorney, CPA - managing the process so they could keep running their business.

If you haven’t started the process yet, the best thing you can do right now is get your house in order. Our exit planning checklist is a good starting point. And when you’re ready to talk about what selling looks like for your specific situation, we’re here.

Have questions first? Contact us - we're happy to help.