Why Japan Due Diligence Is Different
Foreign buyers conducting M&A due diligence in Japan face a different landscape than Western markets. Japan-specific legal rules, administrative practices, and cultural norms create risk categories that standard DD checklists miss.
The biggest surprises for foreign buyers:
1. Regulatory licenses rarely transfer automatically. In an asset purchase, most Japan-specific licenses (customs, pharmaceutical, food, financial, telecom) must be re-applied for in the buyer's name. Applications take weeks to months, and some require local staff or qualifications.
2. Labor law makes workforce restructuring expensive. Japan's labor law strongly protects employees against dismissal. Post-acquisition headcount reduction is legally constrained and often litigated. The cost of restructuring must be modeled into deal economics before signing.
3. FEFTA pre-notification can block the closing timeline. Designated industry acquisitions require government pre-clearance before closing. Timelines are unpredictable and the review period can delay deals by months.
4. Pension and accrued leave liabilities are real and often understated. Japan's retirement benefit system (退職給付) creates significant off-balance-sheet obligations. Accrued unused leave is a cash liability on day 1 post-close.
5. IP ownership is frequently unclear. Japanese employment law governs employee inventions (職務発明) and research tools developed by employees. Without proper assignment agreements historically in place, the target may not legally own the IP that represents its core value.
This guide walks through the key Japan-specific DD categories and what to look for in each.
DD Structure for Japan Acquisitions
Standard M&A due diligence organizes work across legal, financial, tax, and commercial workstreams. In Japan, add two mandatory Japan-specific workstreams: regulatory/licensing and employment. Each must be staffed with Japan-qualified practitioners.
Standard Workstreams Japan-Specific Additions
───────────────────── ───────────────────────────
Legal DD + Regulatory / Licensing DD
Financial DD + Employment Law DD
Tax DD (runs alongside both)
Commercial DD
1. Corporate and Legal DD
Corporate Records
Start with the company's public registration records, which are accessible online via J-LEGAL (登記情報提供サービス) or at the Legal Affairs Bureau:
- Certificate of Registered Matters (登記簿謄本): confirms the company's legal existence, directors, shareholders, capital, registered address, and any registered pledges or attachments on shares
- Articles of Incorporation (定款): governance rules, share transfer restrictions, special provisions
- Shareholder Register (株主名簿): confirms actual ownership (note: the register is not always current if transfers have not been properly recorded)
Share transfer restriction check: KK articles frequently include a provision requiring board approval for share transfers. If present, the board of the target must approve the sale to the buyer - confirm this is obtainable before signing.
Contracts and Change-of-Control Clauses
Review all material contracts (customers, suppliers, technology licensors, distributors, JV partners, landlords) for:
- Change-of-control provisions that trigger termination rights or consent requirements
- Exclusive dealing provisions that may restrict the buyer's other Japan operations
- Governing law: Japan-law contracts in Japanese require qualified translation for accurate review
⚠️ Material customer contracts in Japan are frequently governed by Japanese law and drafted in Japanese. Mistranslations in due diligence summaries have caused buyers to miss termination triggers. Always use qualified legal translators, not general translators.
Real Property
For any owned or leased real property:
- Pull property title certificate (登記簿謄本) to confirm ownership and any liens, mortgages, or抵当権 (hypothecs) registered against the property
- Review all lease agreements for sublease restrictions, renewal provisions, and restoration obligations (原状回復義務 - the tenant's obligation to restore the property to original condition at lease end can be a significant cost)
- Environmental liability: review for soil contamination obligations under Soil Contamination Countermeasures Act (土壌汚染対策法) if the property has industrial use history
2. Regulatory and Licensing DD
This is the workstream most commonly shortchanged by foreign buyers.
License Inventory
Map every license, permit, registration, and approval the target holds. For each, determine:
| Question | Why It Matters |
|---|---|
| Is the license entity-specific or person-specific? | Person-specific licenses (e.g., held by a named 責任者) cannot transfer to the buyer; the named person must continue or a new person must qualify |
| Does the license transfer automatically in a share purchase? | Usually yes - the entity continues, so licenses remain with it |
| Does the license transfer in an asset purchase? | Usually no - must re-apply in the buyer's entity name |
| Are there ownership or nationality restrictions on the license holder? | Some licenses restrict foreign ownership or require Japan-resident qualified persons |
| Is there an ongoing reporting or renewal obligation? | Miss a renewal and the license lapses; re-application may take months |
Common Japan-Specific Licenses to Map
| License Type | Ministry | Transfer in Share Purchase | Re-application Required (Asset Purchase) |
|---|---|---|---|
| Customs broker (通関業者) | MLIT/Customs | ✅ Stays with entity | ❌ New application required |
| Type 1 Pharmaceuticals (医薬品) | MHLW | ✅ Generally yes; notify PMDA | ❌ New Marketing Authorization required |
| Food sales license (食品営業許可) | Local authority | ✅ Usually yes | ❌ New application required |
| Telecommunications carrier (電気通信事業) | MIC | ✅ Generally yes; notify | ❌ New registration required |
| Construction contractor (建設業許可) | MLIT | ✅ Generally yes | ❌ New application required |
| Financial instruments dealer (金融商品取引業) | FSA | ✅ Generally yes; notify | ❌ Registration transfer is complex; seek specialist advice |
| Restaurant / food service (飲食店営業許可) | Local public health center | ✅ Generally yes | ❌ New application required |
| PSE approval (電気用品安全法) | METI | ✅ Stays with entity | ❌ New Notifying Supplier registration required |
📌 This table is indicative only. Each license has its own administrative requirements and the applicable rules can change. Verify directly with the relevant ministry or agency before relying on this in a transaction.
3. FEFTA Pre-Notification Assessment
If the target company operates in a FEFTA-designated sensitive industry, foreign investment pre-notification under 外為法第26条 is required before closing.
Designated Industries Requiring Pre-Notification
- Defense and aerospace (防衛関連)
- Nuclear energy
- Space
- Cybersecurity
- Critical infrastructure (electricity, gas, water, telecom)
- Broadcasting
- Financial system (banking, insurance)
- Railways and aviation
- Semiconductors and advanced electronics
- Rare earth and critical materials
Timeline Impact
The standard pre-notification review period is 30 days, but the government may extend for an additional 30 days (and can request further extension in complex cases). If the deal involves a sensitive sector:
- Submit pre-notification (事前届出) before signing or simultaneously with signing
- Plan for a minimum 60-day review window in the deal timeline
- Do not close before receiving the review completion notice
⚠️ Closing a FEFTA-regulated acquisition without pre-notification can result in forced divestiture and criminal penalties. This is not a risk to manage post-close.
4. Employment Law DD
Japan labor law creates significant post-acquisition risk. This workstream must be resourced adequately.
Headcount and Employment Classification
| Review Item | Risk If Missed |
|---|---|
| Full-time vs. contract worker ratios | Contract workers with 5+ years of service have right to demand indefinite-term employment (無期転換権) under 労働契約法第18条 |
| Fixed-term contracts | Automatic renewal provisions, renewal expectation (更新期待) creates quasi-permanent employment protection |
| Dispatch workers (派遣) | 3-year maximum at one workplace; target may have violations |
| Subcontractor structure | If subcontractors work under the target's direction, they may be deemed employees (偽装請負 risk) |
Dismissal Cost Modeling
If the buyer intends to restructure the workforce post-acquisition, model the cost before bidding:
- Voluntary redundancy packages typically run 6-24 months' salary depending on tenure and seniority
- Contested dismissal (解雇) litigation is common and expensive - Japan courts have a strong track record of restoring dismissed employees to their positions (地位確認訴訟)
- Proportionality standard: Japan courts apply a 4-element test (整理解雇四要件) for economic dismissal: necessity, avoidance effort, selection criteria, consultation. Failure on any element = dismissal void
⚠️ Never assume that operational headcount reduction post-acquisition is straightforward in Japan. If workforce reduction is part of the deal thesis, get qualified Japan employment law advice before term sheet, not after.
Accrued Leave and Retirement Benefits
- Unused annual leave (有給休暇): Employees are legally entitled to carry forward unused leave. This is a cash liability: employees can demand payment on termination. Calculate the accrued leave exposure across all employees.
- Retirement benefits (退職給付): Japan companies often provide retirement allowances either under a defined benefit plan or a lump-sum 退職金 arrangement. The actuarial liability may not be fully reflected on the balance sheet. Quantify.
- Social insurance arrears (社会保険料): Check for unpaid 厚生年金, 健康保険, and 労働保険 contributions. Arrears transfer to the buyer in a share purchase.
Union and Labor Management
- Does the target have a labor union (労働組合)?
- Are there collective bargaining agreements (労働協約)?
- Any pending or recent labor disputes (労働審判 / 裁判)?
5. Tax DD
Standard tax DD with Japan-specific focus areas:
| Area | Japan-Specific Risk |
|---|---|
| Consumption tax (消費税) | Unpaid JCT on intercompany transactions; missed filing for B2B digital services from foreign providers |
| Transfer pricing | Any intercompany transactions with foreign group companies; inadequate TP documentation creates audit exposure |
| Customs duty | Historic undervaluation of imported goods; related-party import transactions at non-arm's length prices |
| Corporate tax loss carryforwards | Losses can be carried forward 10 years; verify the tax basis and remaining period |
| Withholding tax | Payments to foreign entities (royalties, interest, service fees) may trigger WHT obligations; check historical compliance |
| Fixed asset tax (固定資産税) | Assessed annually on January 1; the buyer as of that date owes the year's tax |
| Stamp duty (印紙税) | Material contracts may require stamps; unstamped contracts are not invalid but expose the parties to penalties |
6. IP Ownership DD
Japanese IP ownership rules differ from US and European norms.
Employee Invention (職務発明) Rules
Under 特許法第35条, inventions made by employees in the course of their duties belong to the employer if the employment agreement or company regulations provide for this. However:
- Pre-2015 agreements: inventions belonged to the employee by default; employer had only a non-exclusive license unless a separate assignment was executed
- Post-2015: if the employer's rules properly provide for ownership, inventions belong to the employer upon creation
- Historical companies may have mixed regimes; older employees may hold IP that the company believes it owns
DD check: Review employment agreements, 職務発明規程, and invention assignment records for all key engineers and developers. Identify any unassigned IP.
Software Copyright
Copyright in software developed by employees in the course of employment vests in the employer under 著作権法第15条. However:
- Software developed by freelancers or subcontractors belongs to the creator unless assigned
- Check all software development contracts for explicit IP assignment clauses
Trademark Portfolio
- Search J-PlatPat (Japan Patent Office database) to confirm the target owns the marks it uses
- Check for pending oppositions or cancellation proceedings
- Review license agreements where the target licenses marks to or from third parties
7. Financial and Commercial DD
Japan-specific financial DD items:
| Item | Japan Consideration |
|---|---|
| Revenue recognition | Japanese GAAP (J-GAAP) differs from IFRS and US GAAP in specific areas; understand which standard the target follows |
| Goodwill amortization | J-GAAP requires goodwill amortization (up to 20 years); IFRS uses impairment test only |
| Cross-shareholdings (政策保有株式) | Many Japanese companies hold small strategic stakes in customers/suppliers; these may have hidden gains or losses |
| Deferred tax assets | Japan statutory corporate tax rate ~30.6% (combined); verify recoverability of deferred tax assets |
| Related-party transactions | Transactions with directors, founding families, or affiliated companies at non-market terms |
FEFTA + Employment + Licensing: The Three-Workstream Rule
For any Japan acquisition in a regulated industry, these three workstreams must run in parallel, not sequentially:
Signing (LOI / Term Sheet)
│
┌─────┴─────┐
▼ ▼
FEFTA Employment Law DD
Pre-filing Cost modeling
assessment Union consultation
│ │
▼ ▼
Regulatory Licensing
review period re-application
(30-60 days) planning
│ │
└─────┬─────┘
▼
CLOSE
Starting FEFTA assessment late is the most common cause of deal delays in Japan cross-border transactions.
DD Timeline and Resource Planning
| Phase | Duration | Key Deliverables |
|---|---|---|
| Pre-DD (NDA, data room setup) | 1-2 weeks | Signed NDA, data room access, initial document request list |
| Corporate / Legal DD | 3-4 weeks | Corporate records review, contract analysis, IP mapping |
| Employment DD | 2-3 weeks | Headcount analysis, accrued leave calculation, dismissal cost model |
| Tax DD | 3-4 weeks | Historic tax position, transfer pricing review, deferred tax analysis |
| Regulatory / Licensing DD | 3-5 weeks | License inventory, FEFTA assessment, re-application feasibility |
| FEFTA Pre-notification (if required) | 30-60 days | Concurrent with other DD; notification to Ministry of Finance |
| Management Presentations | 1-2 weeks | Clarification meetings with target management |
| DD Report finalization | 1-2 weeks | Consolidated DD reports, risk summary |
| Total (typical regulated industry) | 10-16 weeks |
How Aplash Supports Japan M&A DD
Aplash is a Japan regulatory strategy and market entry firm. In M&A transactions, we advise on the regulatory workstream:
- FEFTA pre-notification: Determining whether notification is required and navigating the review process with the Ministry of Finance and relevant sector ministries
- Regulatory license mapping: Inventorying all licenses held by the target, assessing transferability, and planning re-applications where required
- Post-closing regulatory transition: Updating registrations, permits, and customs certifications to reflect new ownership
- Import/export compliance audit: Reviewing historical customs filings, HS classifications, and duty positions for undisclosed liability
We work alongside legal counsel and financial advisors - our scope is the regulatory and import/export compliance lens that general M&A advisors typically do not cover in depth.
For M&A regulatory DD scope, contact Aplash. All engagements involving defense, medical, or dual-use industries require Director review before quoting.
Aplash is a Japan regulatory strategy and market entry firm. aplash.io