Can We Change an Employee's Working Hours or Job Duties Without Consent in Korea?

Short Answer

Sometimes, but not always.

In Korea, employers generally have managerial authority to assign work, reorganize teams, transfer employees, and manage business operations.

However, this authority is not unlimited.

Changes to an employee's job duties, work location, working hours, position, or compensation structure may require careful legal review, especially where the change substantially disadvantages the employee or modifies important employment terms.

The key question is not simply whether the company wants to make the change, but whether the change is supported by legitimate business necessity, is reasonable in scope, and does not impose excessive disadvantage on the employee.

---

Can an Employer Change an Employee's Job Duties?

Often yes, but within reasonable limits.

Employers generally have discretion to assign or reassign work as part of normal business operations.

However, a job duty change may become legally problematic if it:

• fundamentally changes the employee's role;
• substantially reduces status or responsibility;
• is used as a disguised disciplinary measure;
• creates excessive hardship;
• appears retaliatory or discriminatory; or
• is inconsistent with the employment contract.

In practice, Korean courts often assess job transfers and reassignments by balancing the employer's business necessity against the employee's disadvantage.

---

Can an Employer Change the Employee's Work Location?

Sometimes.

Transfers to another office, branch, plant, or city may be allowed where there is a legitimate business reason.

Relevant factors may include:

• operational necessity;
• staffing needs;
• the employee's role and qualifications;
• commuting distance;
• family circumstances;
• housing burden;
• impact on compensation or working conditions;
• whether the transfer appears punitive; and
• whether the company consulted with the employee.

If the employment contract clearly specifies a particular work location, changing that location without consent may be more difficult.

---

Can an Employer Change Working Hours?

It depends.

Minor scheduling adjustments may be possible where they fall within the employment contract, work rules, and ordinary business needs.

However, significant changes to working hours require more caution.

For example, legal risk may increase where the company changes:

• regular daytime work to night work;
• a fixed schedule to shift work;
• weekly working hours;
• rest days;
• flexible working arrangements;
• overtime expectations; or
• the overall working time system.

If the company is introducing or materially changing a flexible work system, shift system, or other working time arrangement, additional statutory requirements may apply, including employee representative procedures in some cases.

---

Does Employee Consent Matter?

Yes, especially where the change affects an important employment term.

Employee consent becomes more important where the change:

• affects agreed working hours;
• changes a clearly specified work location;
• materially changes job duties;
• reduces salary or benefits;
• lowers position or title;
• creates significant personal hardship; or
• changes terms that were specifically agreed in the employment contract.

The more fundamental the change, the harder it is to justify unilateral implementation.

---

Can Work Rules Be Changed Instead?

Possibly, but this also requires caution.

If the company changes its work rules in a way that is unfavorable to employees, the employer generally needs the required collective consent.

This may involve consent from a majority labor union or a majority of employees, depending on the workplace.

Employers should not assume that a policy change alone is enough to modify important employment terms.

If the change is unfavorable, the proper work rule amendment process should be reviewed before implementation.

---

What If the Employee Refuses the Change?

The employer should first determine whether the instruction itself is legally valid.

If the change is within the employer's lawful managerial authority, refusal may create disciplinary issues.

However, if the change exceeds the employer's authority or imposes an excessive disadvantage, disciplining the employee for refusal may create legal risk.

Before taking disciplinary action, employers should review:

• whether the change had a legitimate business purpose;
• whether the employee's disadvantage was considered;
• whether the employment contract allowed the change;
• whether internal procedures were followed;
• whether the employee was consulted; and
• whether alternatives were considered.

---

Can We Reduce Salary When Changing Duties?

Not automatically.

A change in job duties or position does not automatically give the employer the right to reduce salary.

Salary is a core employment term and usually requires a separate legal basis for reduction.

If compensation will be reduced, the company should separately review:

• the employment contract;
• annual salary agreement;
• work rules;
• compensation policy;
• whether employee consent is required; and
• whether the reduction could be viewed as an unfavorable change.

A job reassignment should not be used as a way to impose an otherwise unlawful salary reduction.

---

What About Demotion?

Demotion requires particular caution.

A demotion may affect status, title, duties, compensation, career prospects, and reputation.

Employers should consider whether the demotion is:

• supported by a legitimate business reason;
• consistent with company rules;
• proportionate to the circumstances;
• procedurally fair;
• not retaliatory or discriminatory; and
• properly documented.

If the demotion is disciplinary in nature, the company should also consider whether disciplinary procedures must be followed.

---

Why Documentation Matters

Many disputes over job changes, transfers, or working hour changes are decided based on the employer's documented reasons and process.

Useful records may include:

• restructuring plans;
• business necessity memos;
• staffing analysis;
• revised job descriptions;
• transfer notices;
• consultation records;
• employee communications;
• management approvals;
• organizational charts; and
• records showing consistent treatment of similarly situated employees.

Documents created before the dispute are generally more persuasive than explanations prepared afterward.

---

Practical Checklist for Foreign Companies

Before changing an employee's working hours, duties, position, or work location in Korea, employers should ask:

• What exactly is being changed?
• Is the term specifically stated in the employment contract?
• Does the work rule or policy allow the change?
• Is there a legitimate business necessity?
• How significant is the employee's disadvantage?
• Has the employee been consulted?
• Is consent required or advisable?
• Is a work rule amendment required?
• Does the change affect salary, title, or benefits?
• Could the change be viewed as punitive, retaliatory, or discriminatory?
• Has the business reason been documented?
• Have statutory working time requirements been reviewed?

---

Practical Takeaway

Employers in Korea have managerial authority, but that authority has legal limits.

Ordinary job assignments and reasonable transfers may be possible without individual consent, but substantial changes to working hours, work location, duties, position, or compensation may require consent, proper procedures, or additional legal review.

The safest approach is to document the business necessity, assess the employee's disadvantage, and follow the applicable contract, work rule, and statutory requirements before implementation.

---

Conclusion

Foreign companies should not assume that employment terms in Korea can be changed unilaterally as a matter of management discretion.

Before changing an employee's working hours, job duties, work location, or position, employers should carefully review the employment contract, work rules, business necessity, employee impact, and procedural requirements.

A reasonable, well-documented, and proportionate process can significantly reduce the risk of employment disputes.

---