The Ultimate Guide to the Due Diligence Process: Tips and Best Practices – Website Closers

“What is a due diligence process?” For a seller who has been running the show for years, this will be the biggest question once they take on the brand-new challenge of selling a company. It goes the same for a first-time buyer who’s looking forward to giving entrepreneurship a shot.

If it’s your first time offering a business for sale or your first time purchasing a company, this post will give you an idea of what to anticipate during such an important process.

“What is a due diligence process?” For a seller who has been running the show for years, this will be the biggest question once they take on the brand-new challenge of selling a company. It goes the same for a first-time buyer who’s looking forward to giving entrepreneurship a shot.

If it’s your first time offering a business for sale or your first time purchasing a company, this post will give you an idea of what to anticipate during such an important process.

Key Takeaways

• Centralize Data Early: Utilize Virtual Data Rooms (VDRs) to securely manage the information flow and maintain control over sensitive company documents.
• Verify “True” Financials: Focus on the Last Twelve Months (LTM) performance and normalize cash flows to remove one-time accounting anomalies.
• Assess Multi-Dimensional Risks: Evaluate the business through financial, legal, operational, and strategic lenses to uncover hidden liabilities before closing.
• Prioritize Transparency: Maintain open communication between both parties to build trust, accelerate timelines, and prevent deal fallout during negotiations.
• Engage Expert Advisors: Leverage the objective perspectives of brokers, CPAs, and attorneys to identify red flags that internal teams might miss.

Overview of the Due Diligence Process

The buy-side is the one performing the due diligence process steps. This event is an opportunity to get to know more about the target company and whether it’s an investment worth their time, resources, and effort. Different types of due diligence are performed to acquire insights on how the company runs and produces profit, how internal processes work, and what its people are working on.

The sell-side, on the other hand, needs to prepare every aspect of the company thoroughly. What they claim about the business will be verified during the due diligence acquisition process.

This dual-perspective guide on how to do a due diligence shows both buyers and sellers what they need to perform and what they can expect on each step.

What is the Due Diligence Process?

Define due diligence process: Due diligence is an exhaustive appraisal that can either lead to a sealed deal or a decision to walk away from the transaction.

What is the due diligence process from the viewpoint of the business owner offering the company for sale? It is the presentation of documents and data that allows the buyer to check the position of the company from various standpoints, including the following:

• What is the financial standing of the target company?
• Does it operate legally?
• Is it a sound investment in the current and future market state?

The buyer will evaluate these aspects to verify whether or not the seller is truthful with their claims. They can also unearth the liabilities that come from purchasing the company. Ultimately, the assessment answers the question: Is this a good purchase?

With so much information, statements, and presentation, the buyer should double-check if everything the seller claims is coherent with what’s presented. An informed decision can be made afterward.

Importance of Conducting Due Diligence

The buyer already has an understanding of the company before conducting a due diligence assessment. How does the prospect know that what’s disclosed so far is accurate? Is this the opportunity that they’ve been looking for? Will the company’s current state and operations bring them closer to their financial and strategic goals? These questions and more will be answered when buyers conduct due diligence.

Aside from verifying the accuracy of claims and revealed metrics, conducting due diligence, in a way, is for spotting red flags. A buyer and seller may have built rapport during the initial meeting, but it will not matter if the former acquires the business while it’s full of liabilities. When the purchaser is aware of the real status of the possible acquisition, they can make an informed decision before deciding whether or not to close the deal.

Let’s make an EV company in Texas as an example.  With all the excitement around the industry, an investor might jump at the opportunity out of FOMO. Fortunately, if they are partnered with Texas business brokers, they’ll realize that the company is overvalued due to unchecked optimism.

Key Steps in the Due Diligence Process

1. For the seller: You want a sealed deal as the outcome. Make this possible by organizing the steps in due diligence. Data rooms are the way to go, since you gain control over the flow of information through this technology that’s often recommended by business brokers. Never overlook early-stage planning and make a due diligence checklist the moment you’ve decided to sell.
2. For the buyer: With due diligence being a multidimensional setup, buyers simply follow a pre-defined information flow. They, however, need to know which supporting documents to request to truly reveal the status of each business matter. It can get intricate, especially when the target company is in a tightly controlled sector. Typically, the steps of due diligence for a buyer include the following:
   • With the goal as the basis, the buyer needs to uncover the risk factors of the target company, taking into account the location, company size, sector, and future objectives.
   • Among the steps in due diligence process, the bulk of the work will go into data collection and analysis.
   • In the risk analysis portion, the buyer will want to answer the question: Will the advantages of this investment outweigh the liabilities?
   • The last part is for the buyer to determine if the deal will be closed after evaluating what has been discovered so far.

And now, we will break down how to do due diligence in the following sections.

Step 1: Define Objectives

In the context of stages of due diligence, defining goals is all about the following:

• Establishing the extent of the process with strategic fit as the basis
• Settling the aspects of the target company that need to be assessed and which stats should be looked into to uncover liabilities
• Risk appetite: noting the type of risks the buyer is willing to take and how they will be addressed after integration
• Determining early-stage deal breakers that will prevent finalizing a merger or acquisition deal
• Writing down a questionnaire that specifically asks for information and metrics that will help with the buyer’s M&A transaction decision.
• What constitutes a green light for the deal? This should be based on measurable indicators such as the EBITDA range.
• Not all steps in due diligence get the same treatment. Part of defining objectives is determining your focus areas. Look at the categories that deserve more attention. 
  • In some sectors, industry standards and regulatory frameworks have a long term impact. For example: GDPR compliance.
  • Are you a small business owner who has performed every accounting function on spreadsheets? Move from simple spreadsheets to using IFRS or GAAP standards so your financials become clearer, more consistent, and easier for buyers to trust during due diligence steps.

Step 2: Data Collection

 

Due Diligence Type	Primary Focus Area	Key Question to Answer
Financial	P&L statements, tax returns, and TTM revenue.	Are the earnings sustainable and accurately reported?
Legal	Contracts, litigations, and corporate structure.	Does the buyer inherit any lawsuits or compliance failures?
Operational	Supply chain, workflows, and tech stack.	Can the business run efficiently under new management?
Asset/IP	Trademarks, patents, and physical inventory.	Does the company have clear, licensed ownership of its IP?

Medium-to-large size deals will require the use of data rooms for a highly controlled information flow. On the other hand, smaller deals that only have a small amount of documents and data presented, coupled with straightforward terms, will use traditional methods of sharing information, including:

• Email
• Paper-based documentation
• Cloud storage
• Face-to-face meetings
• Portable media

Whether the due diligence stage uses data rooms or traditional methods, you’ll go through this due diligence checklist as the buyer performs due diligence:

• Are the financial statements valid and accurate? This is what you’ll find out during a financial due diligence.
• Is the target company’s operations compliant with local and federal regulations and tax policies? Are there pending litigations? What will you become liable for when you take over? You will answer these questions through a legal due diligence process.
• How is the productivity of the current operating procedures? Is the supply chain running steadily enough to meet demands? If you sell manufacturing companies, operational due diligence will be particularly intricate.
• What exactly are the physical and intangible assets that the company owns? Is the target company’s intellectual property well protected? These are all answered in asset due diligence.
• What is the company’s current position in the industry? Where will it be in the next 5 to 10 years? These are just a few questions answered during strategic and market due diligence.

Step 3: Risk Assessment

“What is due diligence process risk assessment?”

Both the seller and buyers need to understand what exactly is being identified in this major due diligence procedure.

• Items deemed risky for investors can be addressed by the seller even before due diligence.
• The success of the deal depends on how the buyer perceives the risk. Will it dampen the future performance of this investment?

Risk assessment zooms in on these aspects of the target company:

• Financial due diligence
  • Are there inconsistencies with the revenue?
  • Are there questionable items in the accounting books?
• Legal due diligence
  • Are there litigations or contract disputes that remain unaddressed?
  • Are there any known compliance failures in certain areas?
• Operational due diligence
  • Are there processes considered inefficient? Do they waste too many resources?
  • How are supply chain disruptions being handled? Can the target company manage the demand despite setbacks?

This is where the buyer needs to be extra vigilant. Any material issue that will jeopardize the investment halts the deal.

Step 4: Evaluation and Analysis

The due diligence period gives ample time for the buyer and seller to negotiate (with the findings on this process as the basis) and decide to close the deal. 

If you look at the core of the steps in due diligence, the buyer simply wants to answer this question: “Should I buy the company?” Harvard Business Review simplifies the evaluation process for the buyer and suggests answering the following questions to make an informed decision:

• What company am I really purchasing?
  • Look at its customers, market share, the cost advantages of the target company’s rivals, and the capabilities of its assets.
• What is the value of the company by itself, without any added benefits from the deal?
  • Look at the company’s real cash flow. Exclude accounting tricks applied to its financial statements.
• What value can I gain from purchasing this company, and what hidden risks might come with acquiring it?
  • Realistically speaking, how much revenue can the company produce when cost synergies are included?
  • Which liabilities can be costly when ignored?
• At what price will this deal make me walk away?
  • Look at the maximum price of the company itself, without all the items that add value.
  • Add synergies that have been verified during the data collection stage.
  • Put them together to determine the value acceptable to you. Walk away if the seller exceeds it.

How does a seller prepare for this step? Before listing the company, get an accurate business valuation for sale readiness.

How to Do a Due Diligence on a Company

When you think about how to do a due diligence on a company, it’s just looking under the hood. You’re simply checking information and statistics about the company to see whether they match what the seller has claimed and what price they’re asking for. Due diligence done right helps the seller avoid surprises, all while deciding whether moving forward is an excellent decision or walking away is for the best.

In this section, we’ll walk through how to conduct due diligence in a clear, manageable way using the right tools and with help from trusted experts who know what to look for in a target company.

Tools and Techniques

• Every due diligence guide will recommend formulating a due diligence checklist, which lists the scope of the task. From financial due diligence items to legal due diligence aspects, it helps you track areas you’ve checked and those you’ve yet to cover.
• Write down a list of questions, so you can make comparisons with the claims against the data.
• The different types of due diligence will call for specific tools or software. 
  • For example, the most prominent tool for reviewing financials is QuickBooks, which can reveal irregularities and trends.
  • Document management and collaboration are made possible by virtual data rooms. Some service providers offer pricing that’s well-suited for small business owners looking to sell.
  • Take advantage of the latest M&A tech. In recent years, AI-powered document scanners have made it easier to flag issues and tag risks across large volumes of documents.
• SWOT analysis/risk matrix gives the buyer a visualization of the issues, so deal-breakers can quickly be spotted.
• Productivity tools and trackers can help small business buyers check off tasks, assign responsibilities, and monitor the progress of data collection and evaluations. Here’s a quick list of some of the most popular tools:
  • Asana
  • Notion
  • Monday
  • Trello
  • Google sheets 

Working with Experts

Having an advisory team helps you approach the M&A transaction strategically. Combining sector expertise with an objective viewpoint, they bring out synergies and unearth risks that the buyer and seller themselves might miss. Let’s take a look at some of the specific areas where brokers, attorneys, and CPAs can guide you:

• An advisory team keeps the focus on the thing that matters most: your goals for purchasing a company. Throughout the M&A transaction, they will help bring out the best synergies and reveal risk areas that the buyer and seller themselves might miss by preparing due diligence guides.
• Is the financial reporting accurate? Advisors will find out as they run through statements and documents relevant to financial due diligence.
• Is every operational aspect of the company legally compliant? Is the company facing litigation? Legal experts will review all documents and contracts relevant to legal due diligence.
• Intellectual property due diligence support is part of the job of advisors. They check the target company’s IP inventory and identify the following:
  • Are competitive protections being enforced?
  • Does each asset have legitimate ownership and proper licenses?
  • Are filings and renewals updated?
• Advisors also conduct real estate due diligence and evaluate these areas:
  • Lease agreements
  • Property ownership
  • Zoning compliance
  • Potential liabilities tied to physical assets.

On the other hand, if you are selling your business, advisory teams will be responsible for facilitating the presentation of due diligence documents. Both sides negotiate toward favorable terms and a purchase price.

Timelines and Cost Considerations

There is no fixed timeline for any due diligence period. If it’s a small business with clear financials and metrics, it can only take a few weeks. However, for larger companies operating long term in industries with strict compliance standards, the due diligence process could take longer.

The cost of performing this process is also dependent on several factors. If you need a ballpark figure, see the points below:

• Small businesses with under $1M revenue could potentially cost between $25K and $50K.
• When the target company is mid-size, expect to pay around $50K to $200K 
• $150K to over $500K for larger businesses.

How Long Does Due Diligence Take?

It’s only natural for a buyer and seller to wonder about the question, “How long does due diligence take?” After all, they have personal and professional commitments to attend to all while going through this procedure. If both parties want to get this done efficiently, every step should be heavily coordinated.

While this M&A transaction can take two weeks to 90 days, we’ve broken down the stages of due diligence below to give you an idea of its timeline.

The due diligence period starts when a kickoff meeting takes place between the two parties. The buyer sends requests for specific documents and data for due diligence review. Third-party firms handle the review of the following documents and metrics in the aspects below:

• Tax 
• Financials
• HR
• IP
• Technology

The buyer is typically the one who reviews the business and marketing due diligence. Everyone works toward looking at what works and what the possible deal breakers are.

The mid-phase of the merger or acquisition due diligence is all about follow-ups. If there are additional documents and statistics that the buyer wants, they will be requested from the seller.

A week before both parties decide to close the deal, legal reviews intensify. Revisions are applied to the documents before both parties finally sign them. Purchase agreements, disclosure schedules, and other deal-sealing documents are updated every day. Other finishing steps follow (e.g., financing-related approvals).

Best Practices for Successful Due Diligence

Look for time and money-saving ways when conducting due diligence. But how do you make sure you’re staying on track without putting your time, effort, and resources to waste?

See some of the expert-recommended best practices for a successful due diligence below:

• Leveraging due diligence management software. We’ve already mentioned some of the best tools above. The good news is that they can be customized according to your needs, so they can effectively serve as your due diligence guide.
• Create checklists using some of the best trackers and due diligence management software.
• Conducting a due diligence procedure means that you’ll be sorting out risks as you find them. As soon as you spot bottlenecks, resolve them immediately to prevent delays or even deal fallout.
• The good news is that if you are partnered with an advisory team (consisting of lawyers, business brokers, and accountants), they can prepare the due diligence management software according to the intricacies of the deal, as well as the checklist that will keep you on track. An advisory team has gone through this plenty of times, so they can easily guide you through the process.

Maintain Transparency

Although transparency is often demonstrated by the sell-side, it should ideally be practiced by the buyer and seller. Every due diligence process guide will have this caveat: When one side lacks transparency, the deal can fall through due to a breakdown in trust.

Buyers have no other choice but to rely on the information provided to them. But even documents themselves can reveal inaccuracies or points that contradict what the seller claims. In other words, disclosure by sellers should be accurate, responsible, timely, and clear. Forthcoming sellers increase their credibility in the eyes of the buy-side. Their openness moves the process forward and may even result in a better valuation from the other party.

While buyers aren’t expected to disclose nearly as much, transparency still matters on their side. A buyer should be clear about:

• Their intent
• Their financing situation (Do they actually have the resources to purchase the company, or are they going to need financing options?)
• What they’re looking for in a target company and in the deal itself

When there’s transparency from both sides, the buyer and seller can each make an informed decision. Closing becomes faster, and there will be fewer surprises for both sides during the due diligence period.

For sellers: They shouldn’t view transparency as merely good ethics in deals. It should also be seen as a strategic advantage when the time comes to close the deal.

Structure Your Findings

You’ve gathered data regarding the target company. How do you turn them into insights from which you can make an analysis? Through a well-prepared due diligence report. It needs to follow the structure that mirrors the areas specified in the due diligence checklist. These points discuss how you can create structured findings:

• Create a financial baseline from financial statements, tax returns, and total debts.
• Since the successful hiring of important personnel can have a direct impact on deal success, the report needs to have employee and leadership profiles for determining key talent.
• You also need to list your target company’s assets and partners (e.g., IP and third-party suppliers) to find red flags that exist within the operational or supply chain.
• Detection of compliance issues can be done by reviewing legal documentation (e.g., contracts and pending lawsuits).

Organizing and structuring findings make analysis easier. Through these efforts, investors can make smart choices based on clearly laid out risks and opportunities. Look over some sample reports to learn how to write up and evaluate your findings in a way that saves you time.

How do sellers contribute to this process? Before due diligence starts, all data and documents should be organized in a manner that’s easy for prospective buyers to understand. For example, if you sell ecommerce website, get clean financial statements, supplier contracts, traffic analytics, and documentation relevant to company properties ready for presentation.

Common Pitfalls to Avoid

Is this your first due diligence review? An excellent way to avoid the most common mistakes is to become aware of them before you even go through with the process. Some items seem like they’re easy to brush off, but could become costly when you fail to deal with them. And with that, we discuss the pitfalls and how you can address them.

• Failing to prepare the right questions on the day of the due diligence processes. The good news is that you don’t have to start from scratch. A quick search online will give you checklists. Check out Website Closers’ M&A resources to help you formulate some of the best questions, especially about red flags, for due diligence as a buyer.
• Not factoring in potential costs that may be incurred in the due diligence process. Firstly, the due diligence itself shouldn’t be treated as a sunk cost. Whatever additional expenses you may have during this process should be treated as an investment or shield against acquiring the wrong target company. Anticipate these costs by asking your advisory team before taking on this process.
• Lack of coordination and communication. Teams should heavily coordinate for effective risk assessment. On the other hand, the buy-side and sell-side should be willing to have open discussions about the toughest topics. Such conversations may arise when the sell-side discovers major liability issues.

Conclusion: Effective Due Diligence Techniques

Clearly defined roles and responsibilities are the way to go for the due diligence processes to be quick and efficient for all those involved. As a seller or buyer who will soon enter this process, making yourself aware of the things to expect will help you concentrate on the things that matter.

From the get-go, sellers should already have their documentation organized in a way that reflects the company’s true state. Buyers, on the other hand, need to know what they’re looking for as well as their primary focus on a target company during the process of due diligence. They should already have reliable checklists and trusted tools on hand. By this stage, they should have discussed with their advisory team about how to get to the bottom of every detail. 

Applying effective techniques to and using tools for an acquisition due diligence process helps the buyer come to an informed decision. At the end of the day, a successful due diligence is all about transparency, timeliness, and attention to detail. The more prepared both sides are, the smoother the transaction becomes. Most importantly, the purpose of all this effort is to close the deal with confidence or to walk away if the risks are too high. A well-run due diligence process doesn’t just ensure a better transaction today, it also sets both parties on a path to long term success.

FAQs

Within due diligence process steps, how far back should financial statements be reviewed, and which periods matter most?

Financial due diligence best practices suggest presenting three to five years of historical financial data. It’s also common to review the most recent “trailing twelve months (TTM)” or “last twelve months (LTM)” period to get a sense of up-to-date performance just before the deal.

It also isn’t ideal to base data on the company’s peak year. For it to be realistic, it needs to consider both the peak and trough periods.

Post due diligence procedures, how do the findings typically change the outcome of the deal?

Deals will never be a straightforward “yes” or “no.” Instead, findings typically:

• Impact price (up or down) based on risk or opportunity adjustments.
• Alter deal structure via earn-outs, escrow, indemnities, or type of sale (asset vs. equity).
• Shape post-closing integration and value-creation plans (cost rationalization, synergy realization, revaluation of assets).

During a website due diligence how do you check any legacy uses of the domain (e.g., prior spammy or “shady” use) that could hurt reputation or SEO?

Whether it’s a website or an ecommerce due diligence, these are the ways to quickly perform a legacy check:

• Use WHOIS-history tools to check for frequent transfers or anonymized registrations.
• Use Wayback Machine (or similar archive) to browse old versions and to check for content type (adult, spam, scam, malware, doorway pages, etc.).
• Run a backlink profile audit via tools like Ahrefs / SEMrush / Moz to identify toxic/spammy backlinks.
• Check domain reputation via security/spam-list checkers.
• Evaluate redirect history and DNS/hosting history (especially if domain changed hosting many times, used low-quality hosts, or had strange DNS records).

How do NDAs and data-room permissions protect sensitive information while still giving buyers enough detail to make a decision?

NDAs provide the legal guardrails that allow sensitive information to be shared without exposing the seller to undue risk of leaks or competitive harm. They define how data may be used and establish consequences for misuse, giving sellers confidence to engage serious buyers.

But an NDA alone isn’t enough. Virtual data rooms with permissioning add the operational control layer, offering auditability, accountability, and recourse. These tools enable structured, staged disclosure, ensuring sensitive information is not shared too early or too broadly, while still giving buyers the detail they need to make an informed decision.