The 120-Day IT Integration Roadmap: Protecting EBITDA Post-Close

The "Day 2" Hangover: Where Deal Value Goes to Die

You’ve signed the deal. The press release is out. The celebratory dinner is over. Now comes the morning after, and the reality is stark: you own two disparate technology stacks, two conflicting cultures, and one ticking clock.

For Operating Partners, the integration phase is where the investment thesis is either validated or vaporized. According to McKinsey & Company, 30-50% of anticipated M&A value is lost due to slow or ineffective integration. The primary culprit is rarely strategic misalignment; it is operational drag. Specifically, the failure to integrate IT systems prevents the realization of cost synergies (duplicate vendors, overlapping SaaS) and revenue synergies (cross-selling, unified customer data).

Most Private Equity firms rely on a standard “100-Day Plan.” However, in the current technical landscape—defined by fragmented SaaS ecosystems and significant security debt—100 days is often too short to finish, but too long to wait for results. You need a 120-day roadmap that front-loads risk mitigation and back-loads complex architecture, ensuring you stabilize the asset before you attempt to transform it.

This article provides a diagnostic template for the first four months. It is not a suggestion; it is a survival guide for your EBITDA.

The 120-Day IT Integration Template

Stop treating integration as a project management exercise. Treat it as a triage operation. Your goal is not “digital transformation”; it is value capture and risk containment. Use this phased roadmap to structure your first four months.

Phase 1: Stabilization & Control (Days 1–30)

Goal: Gain visibility and prevent security incidents. Do not attempt major migrations yet.

• Secure the Perimeter: Implement a mandatory password reset and enforce Multi-Factor Authentication (MFA) across all inherited admin accounts immediately. 53% of buyers discover undisclosed cybersecurity issues after closing; don't let a breach define your first month.
• Financial Data Bridge: Establish a manual or automated data pipeline to feed the acquirer's FP&A systems. You cannot manage what you cannot measure.
• IT Asset Audit: deploy a discovery agent to inventory all hardware and software assets. You need to know exactly what you bought to identify the "Ghost IT" spend.

Related Reading: Post-Acquisition Day 1: The IT Integration Decisions That Can't Wait

Phase 2: Rationalization & Quick Wins (Days 31–60)

Goal: Capture cost synergies to fund future work.

• The “Kill List”: Identify duplicate SaaS licenses (e.g., Zoom vs. Teams, Asana vs. Monday). Issue cancellation notices for the non-retained tools immediately to stop auto-renewals.
• Vendor Consolidation: Review top 20 vendor contracts. Look for volume pricing leverage by combining the purchasing power of the HoldCo and the PortCo.
• Salesforce/CRM Assessment: Do not merge CRMs yet. instead, clean the data. Map the fields between the two instances to prepare for the inevitable merge.

Related Reading: The CIO’s Guide to Vendor Rationalization Post-Merger

Phase 3: Structural Unification (Days 61–90)

Goal: Connect the workforces.

• Identity Management (IAM): Implement a unified Single Sign-On (SSO) layer (e.g., Okta or Entra ID). This allows employees from both companies to access shared resources without friction.
• Communication Unification: Merge Slack/Teams tenants or set up “trust” relationships between domains. Siloed communication breeds “us vs. them” culture.
• Cross-Sell Enablement: Give sales teams read-access to the opposing company's customer lists (governed by strict role-based access control) to begin testing the cross-sell thesis.

Phase 4: Architectural Optimization (Days 91–120)

Goal: Long-term scalability.

• ERP Strategy: finalize the decision to migrate, integrate, or sunset the acquired ERP. This is a 12-18 month project, but the decision must be made now.
• Network Consolidation: Retire legacy VPNs in favor of a Zero Trust Network Access (ZTNA) model.
• Talent Review: Assess the acquired technical leadership. Who are the “keepers” who know the bodies are buried, and who are the blockers resisting the new operating model?

The Hidden Risks: Security and Culture

Even a perfect technical roadmap can fail due to non-technical vectors. Two specific risks consistently derail integration timelines:

1. The Security Debt Trap

Acquired companies often dress up their financials for sale but leave their security posture in rags. A recent IBM report highlights that the average cost of a data breach is $4.88 million—a direct hit to your deal model. During the first 120 days, the chaos of integration makes you a prime target for threat actors who know that monitoring systems are in flux. Treat security due diligence as an ongoing process, not a pre-close checkbox.

Related Reading: The Valuation Trap: Top 5 Cybersecurity Risks for Private Equity in 2025

2. The “Conqueror” Culture Clash

If your integration feels like a hostile takeover to the acquired engineering team, they will hoard knowledge. This “malicious compliance” slows migration velocity to a crawl. Frame the integration as an upgrade for them—better tools, larger budgets, and more interesting problems—rather than a stripping of their autonomy.

Conclusion: Speed is the New Margin

In Private Equity, time is the enemy of IRR. Every week you spend running parallel systems is a week you are paying double for infrastructure and getting half the visibility. This 120-day roadmap is designed to force decisions, expose rot, and capture value.

You don't need to fix everything in four months. But you must fix the things that kill value. Secure the perimeter, cut the bloat, and connect the people. The fancy digital transformation can wait; EBITDA expansion cannot.