IT Due Diligence in M&A: What Most Buyers Miss
In most acquisitions, IT due diligence gets treated as a checkbox exercise. Someone reviews a list of systems, confirms the network diagram looks reasonable, and moves on. Then, three months after close, the real picture emerges: expired licenses, shadow IT, security gaps that would make your insurance carrier nervous, and integration costs that blow past every estimate.
After leading IT workstreams on dozens of acquisitions, I can tell you — the problems that hurt most are the ones nobody asked about before the deal closed.
What a proper IT due diligence covers
Technical due diligence should answer one fundamental question: what are you actually acquiring, and what will it cost to integrate?
That means going deeper than a system inventory. A thorough assessment covers:
Infrastructure and architecture. What’s on-premises vs. cloud? What’s the state of the network? Are there single points of failure? Is there technical debt that will require immediate investment?
Security posture. Are endpoints protected? Is MFA enforced? When was the last penetration test? What does their incident response plan look like — or do they have one at all?
Licensing and contracts. Software licensing is where hidden costs live. Are licenses transferable? Are they compliant with actual usage? What vendor contracts have auto-renewal clauses or change-of-control provisions?
People and knowledge. Is there a single person who knows how everything works? What happens if they leave? Is anything documented?
Integration complexity. How different are the two environments? What’s the path to unified identity management, email, file sharing, and business applications? What’s the realistic timeline?
The three most common surprises
From experience, these are the issues that catch buyers off guard most often:
1. Shadow IT. The target company’s “official” system list rarely matches reality. Teams adopt their own tools — file sharing services, project management apps, communication platforms — that never went through IT. These tools often contain business-critical data with no backup, no security controls, and no clear ownership.
2. Compliance gaps. The target says they’re “SOC 2 compliant” but what they mean is they started the process two years ago and never finished. Or their compliance applies to one product line but not the division you’re acquiring. Dig into the specifics.
3. Integration timeline estimates. Everyone underestimates integration. Email migration alone — when done properly with minimal disruption — typically takes 4-6 weeks of planning and execution for a 100-person organization. Multiply that across every system, and the “90-day integration” turns into a year-long program.
Day-1 readiness matters
The day the deal closes, both organizations need to function. Employees need email, network access, and the ability to do their jobs. Security controls need to be in place. Communication channels need to work.
Day-1 readiness planning should start well before close. At minimum, you need:
- Network connectivity between the two environments (or a plan for it)
- Identity and access management decisions made
- Email routing configured
- Security baselines applied to the acquired environment
- A communication plan for both teams
What we bring to the table
At Taurent, M&A IT work is a core competency — not a side service. We’ve led integration programs for companies ranging from 50-person startups to multi-hundred-employee organizations across the US and Europe.
We handle the full lifecycle: pre-deal due diligence, Day-1 readiness, integration execution, and infrastructure consolidation. The result is a clear-eyed assessment before close and a disciplined integration after.
If you have an acquisition on the horizon and want to make sure the IT side is covered, let’s talk.