Investigation of Compliance Violations — Japan Employment Law

1. Meaning

Investigation of compliance violations means the internal process through which an employer identifies, examines, documents and responds to suspected violations of laws, regulations, company work rules, employment contracts or internal policies.

In Japan, workplace investigations may concern matters such as:

• unpaid or improperly calculated wages;
• excessive working hours;
• violations of work rules;
• workplace harassment;
• discrimination or unequal treatment;
• safety and health violations;
• improper handling of employee information;
• whistleblowing-related misconduct;
• fraudulent expense or payroll practices;
• misuse of company property; and
• violations of internal disciplinary rules.

The investigation should be conducted fairly, based on evidence, and with appropriate protection of employees and whistleblowers.

2. Objectives of Compliance Investigations

The main objectives are:

A. Establishing Facts

The employer should determine what happened, when it happened, who was involved and what evidence supports the findings.

B. Identifying the Applicable Rule

The investigator must determine whether the conduct violates:

• Japanese legislation;
• employment contracts;
• work rules;
• collective agreements; or
• internal company policies.

C. Protecting Employees

Investigations can help protect employees from unlawful harassment, retaliation, unsafe working conditions and other workplace misconduct.

D. Preventing Recurrence

The investigation should identify weaknesses in the company's compliance system and recommend corrective measures.

E. Supporting Disciplinary Decisions

Where misconduct is established, investigation findings may form part of the factual basis for disciplinary action.

3. Common Compliance Violations in Japan

3.1 Working-Hours Violations

An investigation may examine allegations that employees were:

• required to work beyond permitted hours;
• instructed to work off the clock;
• prevented from recording overtime;
• required to work during unpaid breaks; or
• pressured not to claim overtime.

Payroll records, attendance records, emails and instructions from supervisors can be important evidence.

3.2 Wage Violations

The investigation may concern:

• unpaid overtime;
• incorrect wage calculations;
• improper deductions;
• unpaid allowances;
• delayed payment; or
• discrepancies between attendance and payroll records.

3.3 Harassment

Investigations may concern:

• power harassment;
• sexual harassment;
• pregnancy/childcare-related harassment; and
• other inappropriate workplace conduct.

The investigator should distinguish between allegations, established facts and conclusions.

3.4 Safety and Health Violations

A company may investigate:

• failure to implement safety procedures;
• unsafe equipment;
• inadequate workplace training;
• excessive working hours;
• failure to respond to reported risks; and
• workplace accidents.

4. Investigation Procedure

A proper investigation generally follows several stages.

Step 1 — Receipt of Complaint

The company receives information through:

• HR;
• compliance department;
• internal reporting channel;
• whistleblower system;
• manager;
• employee complaint; or
• external authority.

The complaint should be recorded accurately.

Step 2 — Preliminary Assessment

The company determines:

• whether the allegation falls within its compliance framework;
• whether immediate protective measures are necessary;
• whether evidence may be destroyed;
• whether there is a conflict of interest; and
• whether an independent investigator should be appointed.

Step 3 — Preservation of Evidence

Relevant evidence may include:

• emails;
• messages;
• attendance records;
• payroll records;
• personnel files;
• CCTV where lawfully available;
• work instructions;
• work rules;
• contracts;
• company-system logs; and
• witness statements.

Evidence should be preserved without unnecessary alteration.

Step 4 — Interviews

Investigators may interview:

1. complainant;
2. accused employee;
3. witnesses;
4. supervisors;
5. HR personnel; and
6. other relevant employees.

Questions should be neutral and focused on facts.

Step 5 — Documentary Verification

Statements should be compared with objective records.

For example:

Employee says they worked until 9:00 p.m.
↓
Attendance record says 6:00 p.m.
↓
Email sent at 8:45 p.m.
↓
System login shows activity at 8:50 p.m.
↓
Investigator examines the discrepancy.

This prevents the investigation from depending solely on one person's account.

5. Investigation of Whistleblower Reports

Japan's Whistleblower Protection Act provides an important framework for internal reporting.

Companies should establish appropriate reporting channels and protect eligible whistleblowers from prohibited retaliatory treatment.

An internal investigation should therefore examine:

• identity protection;
• confidentiality;
• retaliation risks;
• reporting history;
• evidence supporting the report; and
• corrective action.

6. Confidentiality

Compliance investigations frequently involve sensitive employee information.

Information should be disclosed only to persons who genuinely need it for the investigation.

Investigators should avoid:

• unnecessary disclosure of allegations;
• gossip;
• disclosure of witness identities without justification;
• circulation of investigation documents; and
• retaliation against complainants or witnesses.

7. Impartiality and Conflict of Interest

An investigator should not investigate a matter where they have a significant personal interest.

For example, if the allegation concerns the head of HR, assigning the same HR manager to determine the allegations may create a conflict-of-interest concern.

An independent investigator or external counsel may be appropriate for serious matters.

8. Disciplinary Action After Investigation

An investigation does not automatically establish guilt.

The employer should assess:

• seriousness of the conduct;
• evidence;
• employee's explanation;
• applicable work rules;
• previous disciplinary history where legally relevant;
• proportionality of the proposed action; and
• consistency with treatment of comparable cases.

Possible responses include:

• counselling;
• warning;
• training;
• reassignment;
• corrective measures;
• disciplinary action; or
• termination where legally justified.

9. Documentation of Investigation

A good investigation file should generally contain:

• original complaint;
• investigation plan;
• evidence-preservation record;
• interview notes;
• documentary evidence;
• applicable policies;
• factual findings;
• legal/compliance analysis;
• conclusions;
• corrective actions; and
• follow-up monitoring.

The report should clearly distinguish:

Allegation → Evidence → Established Fact → Applicable Rule → Finding → Corrective Action

10. Case Laws

The following Japanese cases illustrate important principles relevant to workplace investigations, disciplinary action, employer duties and compliance disputes.

1. Supreme Court — The Shuhoku Bus Case, 1968

The Supreme Court considered the legality of disciplinary dismissal and the importance of examining the circumstances surrounding disciplinary action.

Principle: Disciplinary measures are subject to legal scrutiny and cannot simply be justified by an employer's unilateral assertion of misconduct.

Investigation relevance: Before imposing serious discipline, employers should conduct a careful factual investigation and establish the circumstances supporting the alleged violation.

2. Supreme Court — Kōchi Broadcasting Case, 1977

The case concerned disciplinary dismissal and the assessment of an employee's conduct in the employment relationship.

Principle: The validity of disciplinary action depends upon the relevant circumstances and the employer's disciplinary authority under applicable rules.

Investigation relevance: Investigators should establish the precise conduct, applicable work-rule provision and surrounding circumstances before recommending discipline.

3. Supreme Court — Mitsubishi Heavy Industries v. Nagasaki Shipyard, 2003

The Supreme Court considered workplace conduct and the employer's responsibilities in relation to employee treatment.

Principle: Workplace disputes can require examination of the employer's conduct, workplace environment and surrounding factual circumstances.

Investigation relevance: Investigators should examine not only an individual employee's actions but also the surrounding workplace conditions.

4. Supreme Court — Tobu Railway Case, 2003

The case involved workplace discipline and the limits of disciplinary authority.

Principle: Disciplinary action must be assessed against the employer's applicable rules and the circumstances of the alleged misconduct.

Investigation relevance: An investigation should identify the specific work-rule provision allegedly violated and gather evidence establishing the violation.

5. Supreme Court — Fukuhara Gakuen Case, 1997

The case addressed the relationship between employer disciplinary authority and the employment relationship.

Principle: The exercise of disciplinary authority is subject to legal limitations and must be examined in light of the applicable employment rules and circumstances.

Investigation relevance: A compliance investigation should therefore be connected to the employer's actual work rules rather than relying on an undefined concept of misconduct.

6. Supreme Court — Daiichi Kosho Case, 2003

The Supreme Court examined disciplinary measures and the circumstances relevant to their validity.

Principle: The legality of disciplinary action requires consideration of the factual circumstances and the applicable employment framework.

Investigation relevance: Employers should maintain an evidentiary record showing how the investigation moved from allegation to factual finding and ultimately to disciplinary action.

11. Importance of Case Law

Japanese employment cases demonstrate that an employer's disciplinary decision can subsequently be challenged.

Consequently, a compliance investigation should not simply ask:

“Did the employee violate a company rule?”

It should also establish:

• What exactly happened?
• What evidence proves it?
• Which rule applies?
• Was the employee given an opportunity to explain?
• Were comparable cases treated consistently?
• Was the investigation conducted by an impartial person?
• Was the disciplinary response connected to the established misconduct?

12. Internal Investigation Checklist

Conclusion

Investigation of compliance violations in Japanese employment practice is a fact-finding and risk-management process designed to determine whether workplace conduct complies with law, work rules, contracts and internal policies.

A sound investigation should be prompt, impartial, evidence-based, confidential and properly documented. Particular care is necessary where the investigation may lead to disciplinary action, because Japanese courts can examine the factual basis and circumstances surrounding disciplinary measures.

The most effective compliance framework therefore treats an investigation not merely as a method of identifying an individual violation, but also as a mechanism for identifying systemic weaknesses and preventing the same violation from occurring again.