How to perform IT due diligence in a company

The purchase transaction looks convincing until, after signing, outdated infrastructure, disorganized licenses, weak access controls, and backups that cannot be trusted are discovered. That is precisely why the question of how to perform IT due diligence is not a technical formality, but a business risk assessment. If the IT environment supports sales, customer service, financial processes, and data security, then its quality directly affects the company’s value.

The goal of IT due diligence is not only to find problems. Its task is to understand exactly what the company has bought or plans to buy from a technology perspective, how stable the environment is, how much remediation will cost, and whether there are risks that may affect integration, continuity, or compliance. A good assessment helps make decisions with eyes open, rather than based on assumptions.

How to perform IT due diligence from a business perspective

The most common mistake is to start with a list of servers, licenses, and systems before it is clear what you want to protect in the deal. First, the business context must be defined. Is the goal an acquisition, investment, merger, restructuring, or the start of cooperation? Is the main concern cybersecurity, integration complexity, infrastructure sustainability, or cost transparency? The depth of the review will depend on this.

In a small company, IT due diligence usually does not need to be hundreds of pages long. However, it must cover the critical areas where financial and operational risk is hidden. Management needs to see not only the technical situation, but also its impact on the company’s ability to operate without interruptions.

Start with a system map

The first task is to understand what the environment consists of at all. This means identifying the core infrastructure, business applications, cloud services, network components, endpoint devices, data storage locations, and external vendors. If this picture is not clear, it is impossible to assess risk objectively.

At this stage, it is important to determine which systems are critical to operations and which are only supporting solutions. For example, ERP, accounting, warehouse management, CRM, and email are usually of high business impact. If any of these systems are based on an outdated platform or on the knowledge of one specific person, that is already a significant signal.

Check ownership, access, and dependencies

On paper, a company may have “all the IT,” but in practice accounts, licenses, or administrative access may belong to an outsourcing provider, a former employee, or even a third party in another country. This is one of the most unpleasant discoveries after a transaction, because without control over access, neither security nor governance can be ensured.

It is necessary to determine who owns the domains, the Microsoft 365 or Google Workspace environment, firewalls, backup systems, cloud servers, SaaS subscriptions, and administrator rights. The dependency on a single vendor or a single employee should also be assessed. If the company’s operations are maintained by one external specialist without documentation, the risk is high even if everything works in daily operations.

Main areas to assess in the IT due diligence process

IT due diligence is not just a cybersecurity audit. It is a broader review, where security is only one section. For the assessment to be useful for management, at least the following areas should be examined.

Infrastructure condition and maintainability

You need to assess how old the equipment is, whether there are warranties, whether the systems receive updates, and whether the environment is documented. Outdated infrastructure does not always mean an immediate catastrophe, but it almost always means near-term investment. If servers, network equipment, or workstations are at the end of their lifecycle, this must be reflected in the deal model.

The architectural principle is also important. Is the environment simple and understandable, or has it been assembled over the years from different solutions without a common logic? In the second case, integration after the deal will be more expensive and slower.

Cybersecurity and data protection

You should assess whether the company has multi-factor authentication, endpoint protection, access controls, security logs, vulnerability management, and an incident response process. It is also important to look at whether there have been security incidents and how they were documented.

In small and medium-sized companies, it is common to see security implemented only partially. For example, email may be protected, but servers lack centralized monitoring, or backups exist but there are no regular restore tests. This means the risk is not theoretical, but practical.

If the company processes personal data, customer contract information, or sensitive financial data, the compliance aspect must also be assessed. Here, a statement like “we comply with GDPR” is not enough. It must be clear how data is stored, who has access to it, and how quickly the company can respond to an incident.

Backups, recovery, and business continuity

This section often reveals whether the company is prepared for a real crisis. It is necessary to determine what is backed up, how often, where the copies are stored, whether they are isolated from the primary environment, and whether recovery tests have been performed. If there are no tests, there is no confidence that recovery will succeed.

It is also necessary to assess the business continuity capability. How long can the company operate without a specific system? Are recovery objectives defined? Are critical processes documented? A company with strong revenue but without a real recovery plan may turn out to be much riskier than a more modest, but disciplined, company.

Licenses, contracts, and actual costs

IT costs can be misleading. Some are visible in monthly invoices, but some are hidden in unrenewed contracts, inefficient cloud resources, inappropriate licenses, or expensive on-premises solutions that will soon need to be replaced. During due diligence, it is necessary to determine not only today’s costs, but also the investment needs for the next 12 to 24 months.

It should be checked whether the software in use is properly licensed and whether there are vendor contracts that restrict migration or integration. If the company’s operations depend on a specialized system without a clear support model, it can become a serious risk after the deal.

How to perform IT due diligence without unnecessary complexity

Decision-makers usually do not need a technical document with dozens of screenshots. What is needed is a clear assessment: what works, what is critical, what it will cost, and what the impact on the business will be. Therefore, the process should be structured.

It usually starts with a document request and interviews with the responsible persons. This is followed by access checks, configuration review, risk classification, and consolidation of findings. If the available information is incomplete, that in itself is a finding - a sign of low governance maturity.

It is important to separate three things. First, critical risks that may affect the deal price, timing, or the decision itself. Second, improvements that will need to be made soon after the deal. Third, long-term modernization opportunities that are not urgent, but will affect the budget and integration plan.

If the assessment is performed professionally, it does not stop at the statement “the environment is outdated.” It should explain what that means in practical terms. For example, whether the entire identity management will need to be changed, the backup policy rebuilt, endpoints standardized, or critical systems switched to another hosting model. This is exactly where due diligence becomes a management tool, not just a technical report.

Most common mistakes that make the deal more expensive

The most common mistake is involving IT too late. Financial and legal due diligence are done on time, but IT is only reviewed superficially or at the very end. As a result, problems do not affect either the price or the transition plan, even though fixing them later requires significant resources.

The second mistake is relying only on the descriptions provided by the target company. If it is said that backups exist, their functionality must be checked. If it is claimed that security is in order, it must be understood how this is implemented in practice. Without verification, due diligence loses its purpose.

The third mistake is focusing only on technology and ignoring governance issues. Sometimes systems are in relatively good condition, but there is no documentation, no division of responsibilities, and no clear support model. In such circumstances, even good infrastructure becomes fragile.

For companies that do not have their own large internal IT team, it is usually useful to conduct such an assessment with an independent and business-oriented partner. KSK IT’s approach in such cases is to assess not only the technical environment, but also its impact on continuity, recovery capability, and governance quality.

A good IT due diligence process does not create the illusion that risk will disappear completely. It helps to understand where the risk is acceptable, where it must be addressed before the deal, and where it should be included in the integration budget. If this work is done in time, technology will not surprise owners, investors, or management at the moment when mistakes already carry a high price.