Technology Due Diligence for Acquisitions: Hidden Costs That Can Change Deal Value

Why technology due diligence for acquisitions can change what a business is worth

Technology due diligence for acquisitions can uncover costs and risks that are easy to miss when the financials, customer numbers and growth story all look healthy.

A business may be profitable and growing while relying on ageing software, one indispensable developer, poorly documented systems or contracts that become more expensive after ownership changes. None of those issues necessarily means you should walk away. They do mean you need to understand what you are actually buying.

I have spent much of my career looking at technology from the other side of the sales presentation. Technology that appears perfectly adequate during a demonstration can tell a very different story once you look at how it is built, maintained, secured and supported.

The goal of due diligence is not to find fault. It is to replace assumptions with evidence so that the purchase price, integration plan and investment case reflect reality.

Takeaways

What is technology due diligence in an acquisition?

Technology due diligence is an independent assessment of the technology a buyer is acquiring and the risks, costs and capabilities attached to it.

The exact scope depends on the business.

If you are buying a professional services company, the review may focus heavily on business applications, cybersecurity, infrastructure, data, licences and IT suppliers.

If you are acquiring a software or SaaS company, the product itself becomes a major part of the assessment. That means looking at architecture, source code practices, development processes, cloud infrastructure, technical debt, intellectual property, security and the development team.

A good review should answer a simple business question:

What technology responsibilities, risks and future costs will become mine when the transaction completes?

This is why technology due diligence should sit alongside financial, legal, commercial and operational due diligence rather than being treated as an IT health check at the end.

EY Australia makes a similar point in its guidance on software M&A. Technology due diligence can help investors identify technical debt, scalability constraints and integration barriers before those problems affect post-deal value.

My own approach is to keep the technology discussion tied firmly to the deal thesis. If the investment case says the company can double its customer base, expand internationally or integrate with another platform, the technology review should test whether that is realistic.

The purchase price is not the total acquisition cost

A common mistake is treating the agreed purchase price as the main number that matters.

It is certainly an important number. But after completion, another bill begins.

You may need to:

• replace unsupported software
• improve cybersecurity controls
• migrate data
• consolidate systems
• renegotiate licences
• recruit technology staff
• retain key developers
• move workloads to another cloud environment
• rewrite integrations
• improve disaster recovery
• replace ageing equipment
• separate systems from a former parent company
• integrate identity and access management
• rebuild undocumented business processes

Some of those costs will be unavoidable. Others are strategic choices.

The problem arises when they were not included in the investment model.

If you pay $10 million for a business believing only $200,000 of technology investment is required, then discover that $1.5 million needs to be spent during the first two years, the economics of the transaction have changed.

The business may still be worth buying. You just want to know about that $1.5 million before you agree on the price.

Hidden technology cost 1: Technical debt

Technical debt describes technology decisions that save time or money now but create extra work, cost or risk later.

It is particularly common in growing software businesses.

A startup may deliberately build quickly to test the market. That is sensible. The mistake is assuming that software built to support the first 500 customers will automatically support the next 50,000.

Technical debt can include:

• outdated programming frameworks
• unsupported libraries
• little automated testing
• tightly coupled systems
• undocumented code
• temporary fixes that became permanent
• duplicated functionality
• weak deployment processes
• manual operational tasks
• database designs that become slow as usage grows

Not all technical debt is bad.

Every business makes trade-offs. The key question is whether the debt is understood, controlled and appropriate for where the business wants to go.

An acquisition changes that calculation.

Suppose the investment thesis relies on rapid expansion. A platform that needs twelve months of architectural work before it can support that growth could delay the commercial plan.

That delay has a value.

This is why Technology Due Diligence should connect technical findings to business consequences rather than producing a long list of engineering observations.

Hidden technology cost 2: Cybersecurity problems you inherit

An acquisition does not give you a clean technology environment on Day 1.

You inherit what is already there.

That can include old user accounts, weak access controls, exposed systems, unpatched software, poor backup practices and security processes that exist on paper but are not followed.

The questions I would want answered include:

• Who has administrator access?
• Is multi-factor authentication enforced?
• How quickly are employee accounts disabled when people leave?
• Are backups tested?
• Has the organisation experienced security incidents?
• Are vulnerabilities regularly identified and fixed?
• Who is responsible for security?
• What customer or personal information is stored?
• Where is that information stored?
• Are third parties given access?
• Are there cyber insurance requirements?
• Are there contractual security commitments to customers?

For Australian organisations, the ASD Essential Eight provides a useful reference point for practical security controls.

The NIST Cybersecurity Framework can also help structure discussions around identifying, protecting, detecting, responding to and recovering from cyber risk.

The point is not to demand perfect cybersecurity. Few organisations could pass that test.

You need to understand the exposure you are purchasing and what it will cost to reduce it to a level you can accept.

Hidden technology cost 3: Software licences and supplier contracts

Software costs can look deceptively simple during due diligence.

You see a list of applications and an annual spend.

Then the business changes ownership.

Some contracts may require consent. Others can be repriced. Licensing arrangements may be based on employee numbers, locations, usage levels or corporate structure.

A target may also have received favourable pricing because of a long-standing relationship that the buyer cannot retain.

Look closely at:

• contract expiry dates
• minimum commitments
• termination clauses
• licence transfer rights
• change-of-control clauses
• automatic renewals
• usage limits
• data export charges
• support costs
• implementation partners
• contract ownership
• supplier dependencies

You should also identify software being used without a clear contract.

That sounds basic, but shadow IT is common. A team buys a tool with a company credit card, it gradually becomes operationally critical, and three years later nobody is quite sure who owns the account.

Those little surprises have a habit of becoming expensive at inconvenient times.

Hidden technology cost 4: Key-person dependency

One of the most important technology assets in a business may walk out of the door every evening.

Sometimes only one person knows how a key system works.

They may be a developer, IT manager, contractor, founder or long-term employee.

Everyone says things such as:

“Ask Dave. He knows how that works.”

Dave may indeed be brilliant.

Unfortunately, “Dave knows” is not a continuity strategy.

Key-person risk becomes particularly important during an acquisition because transactions create uncertainty. Employees may leave. Contractors may choose not to continue. Founders may have a limited transition period.

The review should identify:

• critical systems understood by only one person
• undocumented operational knowledge
• access credentials controlled by individuals
• specialist skills that are difficult to replace
• reliance on contractors
• retention risks
• technology decisions concentrated with the founder
• areas without succession planning

This is where my “people before technology” principle becomes very practical.

Technology does not operate independently of the people who understand, maintain and improve it.

Losing one key person can turn a manageable technical issue into an expensive operational problem.

Hidden technology cost 5: Integration

Integration is where optimistic acquisition assumptions often meet reality.

The acquisition model may contain a tidy line saying:

Integrate systems: six months.

That line can hide a remarkable amount of work.

You may need to connect or consolidate:

• Microsoft 365 tenants
• identity platforms
• accounting systems
• CRMs
• ERPs
• payroll
• customer databases
• cloud infrastructure
• reporting platforms
• websites
• support systems
• development environments
• cybersecurity tools
• document storage

Then there is the data.

Two systems may both have a field called “customer”, while meaning completely different things.

One system might identify a customer at the company level. Another treats every branch as a separate customer. One might allow duplicate contacts. Another might require a unique email address.

That is not merely a technical problem. It can affect billing, reporting, customer service and management information.

Integration costs should therefore be tested against the actual systems, data and processes involved.

Technology due diligence guidance increasingly treats integration readiness as a core part of the acquisition assessment, rather than something to work out after the transaction closes.

Hidden technology cost 6: Data quality and ownership

Businesses accumulate data over years.

That does not mean the data is accurate, usable or even legally straightforward to transfer.

Before buying the business, understand:

• what information exists
• where it is stored
• who owns it
• how accurate it is
• whether information is duplicated
• how long it is retained
• what customer agreements permit
• what privacy obligations apply
• how easily it can be exported
• whether it can be integrated with your systems

Data quality directly affects the value of analytics, automation and AI.

A business may promote years of customer data as an asset. If much of that information is incomplete, duplicated or poorly structured, its practical value may be lower than expected.

This matters even more where the acquisition strategy includes AI.

AI does not magically repair poor information management. Feeding unreliable data into better technology usually gives you unreliable answers faster.

Hidden technology cost 7: Cloud infrastructure that looks cheap today

Cloud technology has removed much of the upfront cost of building infrastructure.

It has not removed the need to understand costs.

Cloud bills can increase because of:

• customer growth
• inefficient architecture
• excessive storage
• duplicated environments
• high data-transfer charges
• oversized resources
• poor database design
• unused services
• weak cost monitoring

Look beyond the current monthly AWS, Azure or Google Cloud invoice.

Ask what happens if customer usage doubles.

Then ask what happens if it increases tenfold.

The commercial forecast and the technology cost forecast should tell compatible stories.

If revenue grows 40 per cent but infrastructure expenditure needs to grow 150 per cent to support it, you need to understand why.

This is particularly important when buying SaaS businesses where gross margin assumptions depend heavily on hosting efficiency.

Hidden technology cost 8: Ageing business systems

Not every acquisition involves a software company.

A manufacturing business, healthcare organisation, professional services firm or retailer can still have serious technology exposure.

An old ERP system may work perfectly well today.

The issue could be that:

• the version is no longer supported
• the vendor is ending support
• integrations rely on obsolete technology
• specialist support is disappearing
• hardware needs replacing
• custom modifications prevent upgrades
• reporting requires manual spreadsheets
• moving to a replacement system will take years

You do not necessarily need to replace an older system.

You do need to know whether a replacement is approaching.

A $600,000 ERP replacement required eighteen months after acquisition belongs in the investment conversation before the deal closes, not after.

Hidden technology cost 9: Poor disaster recovery and business continuity

A backup is not the same as the ability to recover.

Ask the target when they last restored a critical system from backup.

If nobody knows, that tells you something useful.

Good due diligence should examine:

• backup frequency
• backup locations
• recovery procedures
• recovery testing
• disaster recovery responsibilities
• recovery time expectations
• critical supplier dependencies
• business continuity plans
• communication during incidents

For a company where technology is central to revenue, downtime can quickly become a commercial issue.

The most important question is not “Do you have backups?”

It is:

How confident are we that this business can keep operating after a serious technology failure?

Hidden technology cost 10: The technology roadmap does not support the business plan

A business strategy and technology roadmap should connect.

If management plans to enter three new markets, launch two products, acquire competitors and double customer numbers, the technology plan should explain how those ambitions will be supported.

Sometimes it does not.

That gap creates future investment.

This is where Technology Strategy becomes relevant. The objective is not to create a giant technology wish list. It is to identify the capabilities required to support the commercial plan.

I normally look for a clear connection between:

Business objective → required capability → technology change → people required → cost → timeframe

If that chain breaks, the acquisition model may be relying on technology capability that does not yet exist.

How technology due diligence findings can affect valuation

A technology issue should not automatically reduce the purchase price.

Context matters.

A known $100,000 upgrade in a $50 million transaction may be immaterial.

A platform requiring a $2 million rebuild to support the growth assumptions in a $10 million acquisition is a different story.

I find it useful to classify findings into four groups.

Finding	Business meaning	Possible response
Deal-critical risk	Could materially undermine the investment thesis	Resolve before proceeding or reconsider the deal
Valuation issue	Creates a reasonably measurable future cost	Consider price, warranty or transaction adjustment
Post-acquisition priority	Needs attention but does not undermine the transaction	Include in Day 1 or 100-day planning
Improvement opportunity	Could create additional value	Add to the future technology roadmap

This prevents every technical finding being treated as a crisis.

It also stops genuinely serious problems disappearing into a 70-page technical report.

Senior decision-makers need to understand the business consequence, not merely the technical observation.

A practical technology acquisition cost framework

One way to make due diligence more useful is to divide technology expenditure into four buckets.

1. Keep

What can remain as it is?

These are systems and capabilities that meet current and expected business needs without major changes.

2. Fix

What can remain but requires remediation?

Examples might include security improvements, upgrades, documentation or technical debt.

3. Replace

What no longer makes commercial sense to retain?

This might include an unsupported ERP, an ageing custom application or an expensive supplier contract.

4. Integrate

What needs to connect with the buyer’s environment?

This can include identity, financial systems, CRM, reporting, data, infrastructure and cybersecurity.

For each item, estimate:

• likely cost
• priority
• timeframe
• people required
• business disruption
• dependencies
• uncertainty

You will never achieve perfect precision before an acquisition.

That is not the objective.

A sensible cost range with assumptions is far more useful than pretending the future costs nothing.

Common technology due diligence mistakes

Leaving technology until late in the process

Technology gets reviewed after most commercial decisions have effectively been made.

At that stage, findings become awkward rather than useful.

Start early enough for discoveries to influence the transaction.

Asking the existing IT team whether everything is OK

The people running the technology should absolutely be involved.

They should not be the only source of assurance.

They may have built the systems being assessed, and they naturally see the environment through the lens of current operations.

Independent assessment gives the buyer another perspective.

Treating the exercise as a checklist

A checklist can help.

It cannot understand the investment thesis.

Two companies using exactly the same technology might represent very different risks depending on what the buyer intends to do with them.

Looking only at technology

People, suppliers, contracts, processes and governance matter just as much.

Technology problems often originate outside the technology itself.

Producing findings without financial context

“Legacy application” does not tell the investment committee much.

“Legacy application requires replacement within 24 months at an estimated cost of $400,000 to $650,000” is more useful.

Ignoring what happens after completion

Due diligence should feed directly into the integration and investment plan.

If the report disappears into a folder the moment the deal closes, part of its value has been wasted.

What should technology due diligence for acquisitions cover?

The scope should reflect the business and investment thesis, but I would normally consider these areas:

1. Technology strategy and roadmap
   Does technology support the company’s business plans?
2. Applications and software
   What does the company depend on and what condition is it in?
3. Architecture and infrastructure
   Can the environment support expected scale and reliability?
4. Cybersecurity
   What security exposure will the buyer inherit?
5. Data and privacy
   What information exists, where is it held, and what obligations come with it?
6. Software development
   How is software designed, developed, tested and released?
7. Technical debt
   What deferred work could create future cost?
8. People and capability
   Is knowledge concentrated in a few individuals?
9. Suppliers and licensing
   Which external organisations does the business rely on?
10. Business continuity and disaster recovery
    Can critical systems recover from failure?
11. Integration readiness
    What will be required to combine the target with the buyer?
12. Future technology expenditure
    What will need to be invested during the next one to three years?

For technology-dependent companies, these questions can materially affect the investment case. Current technology due diligence frameworks similarly focus on product, IT, cloud, cybersecurity, data, intellectual property, people, suppliers and integration rather than simply checking whether current systems are operational.

When should you conduct technology due diligence?

Ideally, before you become commercially committed to assumptions that have not been tested.

The precise timing will depend on confidentiality, access to information and the structure of the transaction.

An initial review may start with:

• management interviews
• architecture documents
• technology budgets
• supplier registers
• software inventories
• security policies
• incident history
• organisational charts
• product roadmaps
• development metrics
• cloud expenditure

That information then guides deeper investigation.

For a software acquisition, the review might later include architecture walkthroughs, source code analysis, development processes and security testing.

The objective should be proportional diligence.

A small acquisition does not need an army of consultants producing hundreds of pages.

It does need enough independent evidence for the buyer to understand material risk.

Technology due diligence should give you negotiating information, not just technical information

The best outcome from due diligence is clarity.

Perhaps the technology is in excellent condition.

That strengthens confidence in the valuation and investment thesis.

Perhaps you discover $500,000 of work is required but the acquisition still makes excellent commercial sense.

Fine. Put that cost into the model.

Perhaps you uncover a security issue that must be fixed before completion.

Make remediation a condition of the transaction.

Or perhaps you discover that the intellectual property, people or platform capability at the centre of the deal is not what you expected.

That may justify changing the deal.

Independent Technology Due Diligence is valuable because it gives business leaders information they can act on while there is still time to act.

Frequently Asked Questions

What is technology due diligence for acquisitions?

Technology due diligence for acquisitions is an independent assessment of a target company’s technology, people, systems, cybersecurity, data, suppliers and future technology requirements. It helps buyers understand the risks and costs they may inherit before completing the transaction.

Can technology problems reduce the value of an acquisition?

Yes. A technology issue can affect value if it requires material investment, delays growth, creates security or operational risk, limits integration or undermines an important assumption in the investment case. The effect should be assessed commercially rather than assuming every technical problem requires a price reduction.

What is the difference between IT due diligence and technical due diligence?

The terms often overlap. IT due diligence commonly focuses on business technology such as applications, infrastructure, cybersecurity, suppliers and operations. Technical due diligence in software acquisitions may go deeper into product architecture, software engineering, source code, technical debt and development capability.

Should a small business acquisition include technology due diligence?

If the business relies materially on technology, yes. The scope can be smaller and proportionate to the value and complexity of the transaction. Even a relatively small business can have costly software contracts, cybersecurity exposure, unsupported systems or dependency on one key person.

What happens after technology due diligence?

The findings should feed into the transaction decision and post-acquisition plan. Actions may include negotiating commercial terms, requiring remediation before completion, retaining key employees or creating a prioritised technology roadmap for the first 30, 60 and 90 days.

Final Thoughts

Buying a business always involves uncertainty. The aim is not to remove every risk but to understand the material ones before they become yours.

A strong acquisition decision considers what the business owns today, what the buyer wants it to become and what it will realistically cost to bridge the gap. That is the real value of technology due diligence for acquisitions.