IT Due Diligence Japan — M&A IT Assessment, Tokyo

The Hidden Cost of Skipping IT

Financial and legal due diligence are standard practice in any acquisition. IT gets less scrutiny — until integration day, when you discover the target company's core system runs on a server nobody has credentials for, the ERP license can't transfer without a six-figure fee, or the office network depends on an NTT contract that takes four months to reassign.

These surprises are preventable. A proper IT evaluation before closing reveals the true state of the technology you're buying.

Why Japan Is Different

If your global team sends a standard IT due diligence checklist to the Japan office, expect gaps. Japan's IT environment operates on assumptions that differ significantly from North America, Europe, and most of Asia.

Telecom infrastructure. NTT controls most business internet and phone lines in Japan. Transferring these contracts to a new legal entity after acquisition requires paperwork and lead times measured in weeks to months, plus coordination with building management. Your global team's plan to "just switch the internet over" won't survive contact with NTT's process.

Vendor lock-in. Many Japanese companies outsource IT operations to a single systems integrator (SIer) under multi-year contracts. The SIer often holds the only copies of network diagrams, server configurations, and operational procedures. When you acquire the company, you inherit this dependency. Extracting from it — or even understanding what you now own — has real costs that belong in your acquisition budget.

Compliance. Japan's Act on Protection of Personal Information (APPI, significantly strengthened in 2022) and the My Number Act impose strict IT handling requirements with specific technical controls. J-SOX mandates documented IT general controls. If the target's compliance posture is weak, you inherit that liability the moment the deal closes.

Legacy systems. On-premise file servers, custom-built attendance and expense management systems, paper-based approval workflows (ringi-sho) — these remain common in Japanese companies of all sizes. Migrating them to your global platform takes longer and costs more than headquarters typically budgets for.

What We Evaluate

eSolia has supported international companies in Japan for over more than 26 years. We know where the risks hide because we've managed these environments firsthand.

Assets and Licensing

We inventory all hardware, software, and cloud services, then verify each license's contract holder, transferability conditions, and renewal schedule. Microsoft Enterprise Agreements, Oracle, and SAP licenses all have M&A-specific transfer rules that can add significant unplanned costs.

Security and Compliance

We review APPI compliance status, My Number handling procedures, J-SOX IT control documentation, and any ISO 27001 or ISMS certifications. We also examine the history of security incidents and the maturity of the target's incident response capability.

Operational Costs

We map the full annual IT cost structure: telecom lines, maintenance contracts, outsourcing fees, license renewals, and cloud subscriptions. This gives your finance team accurate numbers for post-acquisition budgeting — including contract termination penalties that are easy to overlook.

Integration Risks

We assess what's required to connect the target's email, directory services, and network to your infrastructure. We separate Day 1 requirements (what must work immediately after closing) from medium-term integration work, and produce a phased roadmap with realistic timelines for Japan's vendor ecosystem.

Bilingual Reporting

Every deliverable ships in English and Japanese. The English report gives your headquarters and board the full picture of what they're acquiring. The Japanese documentation ensures the local team understands the integration plan and can execute it. No translation lag, no secondhand summaries.

We've completed IT due diligence across multiple M&A transactions involving Japanese companies — see our M&A due diligence case study and post-M&A BPR case study for examples. To discuss scope and approach for your deal, contact us.

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