Even with a strong strategic rationale and thorough due diligence, value can be diluted by integration complexity, regulatory constraints, or underestimated technology debt. Conversely, a clearly articulated integration thesis, a focused and pragmatic technology roadmap, and strong Day–1 readiness will enable and even accelerate value realization within the first 100 days.
Drawing on experience from multiple engagements, Envosight has identified a consistent set of IT–related challenges that materially influence M&A outcomes, along with practical approaches to address them. While the full complexity of IT in M&A cannot be exhaustively covered in a brief article, this overview highlights the most frequently encountered challenges, common red flags, and the indicators that signal effective execution and value realization.
Many deals focus on financial and operational synergies but overlook IT. When there is no clear decision on whether systems should be fully integrated, kept separate, or partially merged, IT teams move in different directions. This leads to slower Day 1 readiness, higher costs, growing technical complexity, and synergies that are never fully realized.
Mitigation:
Define a clear IT Integration thesis during due diligence and establish upfront which systems will be integrated, which will remain standalone, and which will be phased out. Anchor IT decisions in the deal’s strategic priorities – such as speed, cost synergies, or regulatory compliance – and set a clear governance model with a phased execution roadmap.
Differences in ways of working – such as agile versus waterfall delivery models, product versus project ownership, or insourced versus outsourced IT – create friction across the combined organisation. This misalignment slows decision-making and execution, ultimately delaying integration progress and the realisation of merger synergies.
Mitigation
Establish an Integration Management Office (IMO) with clear decision authority and a product-centric operating model. Organise integration around business value streams rather than functional or technical silos, assigning end-to-end accountability to each product team. For example, instead of separate teams managing network migration and ERP consolidation, a single Finance Operations team would own all IT capabilities required to integrate finance – systems, data, and reporting – under one governance structure. This reduces handovers, accelerates delivery, and keeps execution aligned to business outcomes.
Carve-outs typically rely on Transition Service Agreements (TSAs) to ensure business continuity while the buyer establishes independent systems and processes. In practice, TSAs often span hundreds of applications and services, making them complex to manage. Sellers typically charge a premium for TSA services and impose escalating costs for extensions, creating a material risk of cost overruns, delayed separation, and prolonged dependency on the seller.
Mitigation
Treat TSA-exit as a formal programme with clear ownership, milestones, and value targets.
Define an application-by-application TSA exit plan with clear timelines, accountable owners, and governance through the Integration Management Office. Prioritise high-cost and high-risk services—typically ERP, finance, and core infrastructure—to accelerate run-rate savings. Incorporate flexibility into TSA agreements, including early termination rights and cost caps. Track run-rate savings and quantify the financial benefits of TSA exit to maintain executive focus and momentum.
Even well-designed integrations fail if employees do not adopt new processes, systems, and ways of working. In M&A, organisational change management is often deprioritised as leadership focuses on structural and financial integration. Without a structured approach to change, employees lack clarity, training, and engagement, leading to resistance, confusion, and reduced productivity. This can ultimately limit return on investment and create ongoing operational inefficiencies.
Mitigation
Treat organisational change management as a core integration workstream. Establish a structured change programme with clear ownership, including stakeholder mapping, role-based training and enablement, and targeted communication. Define and track adoption KPIs (e.g. usage, capability readiness, behaviour change) and actively monitor progress through the Integration Management Office to ensure sustained adoption post-merger.
Merging organisations typically operate with different master data models, standards, and naming conventions for customers, products, suppliers, and financial accounts. Legacy systems often lack sufficient metadata and lineage, making data origin and usage difficult to trace. In regulated industries, this creates material compliance risk. The result is slower integration, unreliable reporting, and ongoing operational inefficiency.
Mitigation:
Define a canonical data model and establish master data governance early. Create a unified data structure for critical domains (finance, customer, product, regulatory) and launch a dedicated Master Data Management (MDM) workstream. Assign data ownership, enforce standards, and implement data lineage controls. Prioritise finance, regulatory, and customer data to enable Day 1 reporting, compliance, and decision-making.
Unclear decisions on core platforms – such as lift-and-shift versus re-platforming – create delays, rework, and sunk costs. At the same time, delayed application rationalisation leads to duplicated systems, growing technical debt, and higher IT run-rate costs. Fear of business disruption often postpones these decisions, eroding integration value.
Mitigation:
Apply disciplined platform and application decisions early. Use a decision framework (value, risk, regulation, time-to-benefit) to determine the future of each core platform. In parallel, run a focused application rationalisation effort – classifying systems to run, transform, or retire – with clear savings targets and decommission timelines. Plan controlled coexistence and limit unnecessary transformation to avoid added complexity.
Different cloud platforms, SaaS tenants, and network architectures across the merged entities create complexity, security exposure, and increased cost. Inconsistent identity, connectivity, and collaboration models limit productivity and slow integration, particularly in the early post-close phase.
Mitigation:
Define a clear target for cloud, network, and collaboration platforms early. Select a tenant-of-record for collaboration tools and establish standard landing zones for cloud workloads. Define secure network interconnects and enable interim cross-tenant collaboration to support Day 1 productivity. Progressively harmonise identity and access using single sign-on and common security standards.
Differences in security baselines, risk controls, and regulatory obligations can stall integration and expose the organisation to compliance failures. This risk is heightened in regulated industries where certification, auditability, and data protection requirements must be met from Day 1.
Mitigation:
Conduct security diligence with the same rigor as financial diligence. Map control gaps against regulatory requirements and define a phased hardening plan covering Day 1, Day 30, and Day 100 to ensure compliance and audit readiness.
While deals often commit to cost and growth synergies, the role of IT is underestimated in the formal value-realisation model. Synergies are defined at a business level but not translated into concrete IT initiatives, and IT cost baselines are often unclear. Without visibility and ownership, IT integration risks becoming a cost centre rather than a value driver.
Mitigation:
Link IT initiatives directly to synergy commitments made by business. Translate synergy targets into clear IT deliverables and track them through a dedicated synergy dashboard. Embed synergy KPIs into IMO governance, with each workstream accountable for its contribution. Quantify baseline IT costs, TSA exit savings, and ongoing benefits to ensure transparency and sustained executive focus.
• % TSA cost exited (by €) – not just by count
• Monthly TSA run-rate savings (€)
• Extension exposure (days / € at risk)
• Multi-Factor Authentication (MFA) coverage (%)
• High-severity findings resolved (count)
• Mean Time To Detect/Respond MTTD/MTTR (detect/respond)
• Data lineage coverage (% of critical reports with end-to-end lineage)
• Data quality score by domain (accuracy/completeness/consistency)
• Report migration coverage (% finance/regulatory reports on target model)
• Run-rate cost removed (€) verified by Finance (from decommissioning)
• Tech debt index (trend) or duplicate platforms remaining (count)
• Unit economics (e.g., cost per user/order/report) and waste rate (%) (idle/under-utilised)
• Employee NPS on Day-1 tools
• Customer service SLAs maintained/improved
• Synergies enabled by IT (€ / % of total case) with named initiatives
• TSA exit savings realised (€) and platform decommission benefits (€)
• No clear integration strategy – absorb, co-exist, transform – teams work in different directions
• Lack of business ownership – business disengage after signing and lack ownership of IT-integration
• No realistic integration roadmap or value tracking
• IT Due Diligence is superficial – synergies assumed in deal model are unrealistic
• Weak IT governance and decision rights – no empowered integration management office (IMO)
• Underestimating data complexity – migration is treated solely as a technical task, rather than a business task
• Over-reliance on temporary fixes and TSAs – work arounds become semi-permanent
• Ignoring security, compliance and regulatory constraints – forced re-design
• Talent loss in key IT-roles – key architects and integration experts leave the organisation
IT is not a back-office afterthought — it is the operating system of the deal. The most successful acquirers treat integration as a product, not a project: anchored in a clear integration thesis, precise Day-1 execution, disciplined data and platform decisions, and a change narrative that mobilises the organisation.
Do reach out to us to learn more about the Envosight Consulting IT M&A Framework or hear more about concrete client examples.
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