Short-Time Work Options for Parents in Japan

In Japan, “short-time work for parents” primarily refers to the 育児のための所定労働時間の短縮措置 (ikuji no tame no shotei rōdō jikan no tanshuku sochi) under the Act on Childcare Leave, Caregiver Leave, and Other Measures for the Welfare of Workers Caring for Children or Other Family Members (“Childcare and Caregiver Leave Act”). The central statutory provision is Article 23.

As of the current framework, an employer generally must provide a short-time working system for an employee raising a child under three years of age, normally including a system reducing daily scheduled working time to six hours.

1. Meaning and purpose

The purpose of short-time work is to allow a parent to remain employed while reducing scheduled working hours sufficiently to manage childcare.

It is different from:

• full childcare leave;
• resignation and re-employment;
• ordinary part-time employment;
• exemption from overtime;
• flexible working hours; or
• merely changing the employee's shift.

The statutory system changes the employee's scheduled working time while preserving the employment relationship.

The Ministry of Health, Labour and Welfare (MHLW) explains that the standard statutory arrangement should include a daily working schedule of approximately six hours.

2. Who is generally eligible?

The principal statutory category is a worker raising a child who is under three years old and who is not currently taking childcare leave.

The current MHLW guidance identifies, among others, the following general requirements:

1. The worker must not be a daily-hire worker.
2. The worker's normal scheduled working time must not already be six hours or less.
3. The worker must not be currently taking childcare leave.
4. Certain workers may be excluded by a valid labour-management agreement. 

Importantly, the system is not limited to mothers. Fathers and other eligible employees raising children are also covered.

Fixed-term employees can also fall within the statutory framework; being on a fixed-term contract does not automatically remove eligibility.

3. What does "short-time work" actually provide?

The basic model is:

Normal schedule → reduced scheduled hours → continued employment

For example:

The statutory requirement is not necessarily that every employer must use exactly one identical timetable. The employer's system can contain different arrangements, provided the statutory requirements are satisfied.

MHLW guidance also recognizes arrangements such as five-hour or seven-hour schedules, fixed reduced-work days, and three-day workweeks as potentially useful supplementary arrangements, although the worker must still have a genuine ability to access the statutory six-hour option where applicable.

4. Alternative arrangements where ordinary short-time work is difficult

This is particularly important for:

• hospitals;
• retail;
• manufacturing;
• customer-facing positions;
• security;
• transportation;
• shift work;
• jobs requiring continuous staffing.

Where the nature or organisation of the work makes ordinary short-time work difficult, the employer may use statutory alternative measures.

Current MHLW materials identify alternatives including:

• childcare-leave-equivalent arrangements;
• flexible working hours;
• changing starting/finishing times;
• employer-provided childcare facilities;
• telework.

Telework was added to the alternative-measure menu from April 1, 2025.

Thus, an employer should not simply say:

"Your job is difficult to perform part-time, so you cannot use any childcare-related working arrangement."

The statutory framework requires the employer to consider the legally prescribed alternative arrangements where the ordinary short-time system cannot be provided.

5. Flexible options for parents

A well-designed Japanese parental working-time policy can therefore include several options.

A. Six-hour working day

This is the core statutory model.

Example:

9:00–18:00 → 9:00–16:00

B. Earlier starting time

Example:

7:30–14:30

Useful where the employee needs to collect a child from daycare.

C. Later starting time

Example:

10:00–17:00

Useful where morning childcare is the main difficulty.

D. Fixed reduced days

For example:

• Monday–Friday normally;
• Wednesday as a non-working day.

MHLW guidance specifically identifies fixed days with reduced scheduled hours as a potentially desirable arrangement.

E. Four-day or three-day arrangements

These may be available under an employer's broader parental-work policy or as an alternative structure.

F. Flexible working hours

Flex-time may permit parents to concentrate working hours around childcare obligations.

G. Telework

Where the work is suitable, telework can provide another means of reconciling employment and childcare, and is now included among statutory alternative measures for qualifying difficult-to-accommodate jobs.

6. Salary during short-time work

Short-time work does not automatically mean that the employee must receive the same salary as a full-time employee.

There is an important distinction:

Reduction corresponding to hours not worked
→ generally capable of being lawful.

Additional financial penalty because the employee exercised the childcare right
→ potentially unlawful.

MHLW guidance explains that an employer may generally avoid paying wages for hours that the employee actually does not work. But treating the employee as having worked even less than the actual reduction, or imposing an additional disadvantage because the employee used the system, can constitute prohibited disadvantageous treatment.

Therefore:

8 hours → 6 hours does not necessarily require 100% salary.

But:

8 hours → 6 hours → employer additionally treats the employee as having two further hours of absence

may create a serious legal problem.

7. Bonus and promotion issues

This is one of the most important litigation areas.

An employer may have legitimate systems based on:

• actual working time;
• attendance;
• performance;
• contribution;
• hours actually worked.

However, the employer must distinguish between genuine consequences of reduced work and punishment for exercising a statutory childcare right.

The Supreme Court's leading decision is particularly important here.

8. Prohibition on disadvantageous treatment

The Childcare and Caregiver Leave Act prohibits disadvantageous treatment because an employee:

• requests childcare-related statutory measures;
• uses childcare leave;
• uses qualifying short-time work;
• exercises related statutory rights.

Accordingly, employers should be particularly careful with:

• dismissal;
• non-renewal;
• demotion;
• reduction in grade;
• adverse transfer;
• arbitrary salary reduction;
• bonus exclusion;
• negative performance evaluations;
• removal from career tracks;
• forced conversion to part-time employment.

MHLW expressly states that dismissal, non-renewal and reduction in pay because of exercising the short-time-work system can constitute prohibited disadvantageous treatment.

9. Case Law

The following six cases are particularly useful for understanding Japanese parental short-time-work arrangements and the legal boundaries surrounding them.

Case 1 — School Corporation Tōhō Gakuen / A Gakuen Case

Supreme Court, December 4, 2003

This is one of the most important authorities directly concerning childcare-related reduced working hours.

The employee took maternity leave and subsequently used a childcare-related reduction in working hours. The employer's bonus rules required a 90% attendance rate. The employer counted maternity leave and the reduced-working-time period against attendance and consequently refused to pay the bonus.

The Supreme Court examined whether the attendance rule effectively discouraged employees from exercising statutory rights.

The Court held, in substance, that treating maternity leave and childcare reduced working time in a manner that caused the employee to lose the entire bonus could undermine the statutory protection and was contrary to public policy.

Principle

An employer may recognize the economic consequences of actual non-work, but cannot structure remuneration rules so severely that exercising statutory childcare rights is effectively penalized.

HR significance

Bonus policies should expressly explain:

• how reduced working hours affect bonus calculations;
• what constitutes actual absence;
• whether performance and attendance are separately assessed;
• that statutory childcare leave or short-time work will not be treated as misconduct or artificial absence.

Case 2 — Japan Schering K.K. Case

Supreme Court, December 14, 1989

This case involved an attendance-rate requirement for wage increases.

The employer treated legally protected absences—including maternity leave and childcare time—as absences when calculating eligibility for certain economic benefits.

The Supreme Court focused on whether the rule discouraged employees from exercising statutory rights.

Principle

A system may have a legitimate attendance-based purpose, but it becomes problematic when its operation discourages or effectively penalizes the exercise of statutory rights.

Relevance to short-time work

The case provides an important conceptual foundation for assessing:

• merit increases;
• attendance bonuses;
• promotion criteria;
• incentive payments;
• parental short-time-work arrangements.

Employers should therefore distinguish legitimate productivity criteria from criteria that effectively punish parental-rights use.

Case 3 — Hiroshima Central Health Cooperative Case

Supreme Court, October 23, 2014

This case concerned a pregnant employee who requested transfer to lighter work and was subsequently removed from a supervisory position.

The Supreme Court established an important framework for assessing adverse treatment connected with statutory pregnancy/maternity protections.

The Court treated the statutory prohibition on disadvantageous treatment as a mandatory rule and explained that an adverse measure can nevertheless escape invalidity only in limited circumstances—for example, where there is an objectively reasonable basis demonstrating the employee's genuinely voluntary consent or exceptional operational necessity consistent with the statutory purpose.

Principle

An employer cannot simply rely on:

"The employee agreed."

The circumstances surrounding the agreement matter.

Relevance

The same reasoning is highly relevant where an employer tells a parent:

"You can work reduced hours, but only if you accept demotion / lower grade / loss of position."

Such arrangements require careful examination of voluntariness, business necessity, and the extent of the disadvantage.

Case 4 — Y Company Demotion Appeal Case

Tokyo High Court, December 27, 2011

The employee returned from childcare leave and began using the company's short-time-work system. The employer changed her duties to lighter work and reduced her role grade by two levels. The employee argued that the measures constituted unlawful disadvantageous treatment.

Importance

This case demonstrates the practical HR risk of treating short-time work as a reason for:

• reducing job responsibility;
• lowering grade;
• changing career trajectory;
• removing established duties.

A change in duties may sometimes be operationally necessary, but the employer must carefully assess whether the change is genuinely attributable to business requirements or is effectively a penalty for using parental rights.

Case 5 — Japan Business Lab Case

This case concerned an employee returning from childcare leave.

The employee moved from an indefinite employment arrangement to a fixed-term arrangement involving three days per week and four hours per day after childcare leave. The court found the particular agreement valid because the evidence showed a sufficiently informed and voluntary choice under the circumstances.

Principle

Not every move to reduced hours or a different employment form after childcare leave is automatically unlawful.

The critical questions include:

• Was the choice genuinely voluntary?
• Were alternatives explained?
• Was the employee given sufficient time to consider them?
• Were the contractual consequences clearly explained?
• Was the change imposed because of childcare leave?

HR lesson

Employers should document:

1. available options;
2. employee discussions;
3. employee's preference;
4. salary consequences;
5. contract duration;
6. working days/hours;
7. possibility of returning to another arrangement.

Case 6 — Toshiba / Childcare-Leave Return and Assignment Principle

Japanese parental-rights jurisprudence also emphasizes that returning from childcare leave does not give an employer unlimited freedom to impose an adverse assignment.

MHLW materials discussing more recent case law explain that an employee returning from childcare leave does not necessarily have an absolute statutory entitlement to the identical post in every circumstance. However, a post-return assignment can become unlawful where it creates substantial economic or other disadvantage and cannot be adequately explained by normal personnel-management rules.

Principle

The question is not simply:

"Was the employee technically given another job?"

The relevant assessment includes:

• salary;
• rank;
• duties;
• commuting;
• future career;
• workplace;
• ordinary personnel-management practices;
• economic and psychological disadvantage.

This is highly relevant to parents returning to work on reduced hours.

10. A particularly important distinction: reduced hours vs part-time conversion

Employers should not automatically tell an employee:

"If you want shorter hours, you must become a part-time employee."

That can be legally problematic where the employee qualifies for the statutory short-time-work system.

A Japanese Labour Bureau example describes precisely such a situation: an employee returning from childcare leave requested short-time work, was told that the company had no such system, and was then told that she could become a part-time employee instead. The Labour Bureau explained that the statutory childcare short-time-work framework could apply and that disadvantageous treatment for requesting it was prohibited.

The distinction is:

Statutory short-time work

→ employee remains within the existing employment relationship and uses a childcare accommodation.

Part-time conversion

→ potentially changes the employee's contractual status, compensation, benefits and career conditions.

The latter should not be used as a disguised substitute for the former.

11. Working Rules and company policies

The employer should have clear provisions in its work rules (就業規則) covering:

• eligibility;
• application procedure;
• notice period;
• available working schedules;
• commencement and ending dates;
• salary calculation;
• bonus treatment;
• overtime;
• social insurance;
• holidays;
• return to ordinary working hours;
• treatment of transfers;
• alternative arrangements;
• telework;
• management of attendance.

MHLW guidance indicates that working rules should specify working-time arrangements such as start and end times where such systems are adopted.

12. Overtime and short-time workers

The employer should not assume that a short-time worker has unlimited availability outside the agreed schedule.

For example:

Scheduled: 9:00–16:00

The company should not routinely treat the employee as effectively available until 18:00 merely because full-time employees work until 18:00.

Where overtime is genuinely performed, the ordinary working-time and overtime rules must still be considered.

The practical objective of the childcare system would be undermined if an employee formally works six hours but is routinely expected to remain available for additional hours.

13. Short-time work and flex-time

Parents may combine different working-time mechanisms where legally and contractually available.

For example:

Flex-time + childcare reduction

An employee might have:

• shorter total working time; and
• flexibility concerning when those hours are performed.

MHLW's current guidance on childcare short-time employment benefits specifically explains how shortened working arrangements are treated where an employee is subject to flex-time, variable working-time or discretionary-work arrangements.

14. Financial support: Childcare Short-Time Work Benefit

A major recent development is the 育児時短就業給付金 (Childcare Short-Time Work Benefit).

For qualifying employment-insurance participants raising a child under two, the system can provide a benefit broadly corresponding to 10% of wages during qualifying short-time work, subject to the statutory adjustment rules and eligibility conditions.

This is important because the economic impact of reduced hours can otherwise discourage parents from using the system.

15. Employer compliance checklist

For Japanese employers, a practical compliance framework is:

Before receiving an application

• Have a written short-time-work policy.
• Identify eligible employees.
• Check the applicable labour-management agreement.
• Identify legally permissible exclusions.
• Establish clear application procedures.

When the employee applies

• Confirm the child's age.
• Confirm eligibility.
• Explain available schedules.
• Explain salary implications.
• Explain bonus implications.
• Explain social-insurance implications.
• Consider telework/flex-time alternatives where relevant.
• Avoid suggesting resignation or compulsory part-time conversion.

During short-time work

• Pay according to actual contractual working time.
• Do not artificially inflate absence records.
• Do not penalize the employee for exercising the statutory right.
• Avoid discriminatory performance assessments.
• Monitor overtime carefully.
• Preserve career-development opportunities where practicable.

At return to ordinary work

• Confirm the end date of the short-time arrangement.
• Restore ordinary working arrangements.
• Review assignment objectively.
• Avoid retaliatory transfers or demotion.
• Document legitimate business reasons for any personnel change.

16. Key legal principles from the six cases

Conclusion

Japan's short-time-work framework is designed to let parents continue employment while reducing working hours, rather than forcing the choice between full-time work and leaving employment. The core statutory model is a reduced schedule—generally including a six-hour day—for eligible employees raising children under three.

The major legal risk for employers is not merely failing to create a six-hour schedule. It is also making the exercise of that right economically or professionally unattractive through bonus exclusion, artificial attendance penalties, demotion, forced part-time conversion, adverse transfers, or other disadvantageous treatment. The Supreme Court's Tōhō Gakuen and Japan Schering decisions are particularly important on economic disadvantage, while Hiroshima Central Health Cooperative provides an important framework for assessing adverse measures connected with protected family-related rights.

Note: The six cases above are Japanese employment-law authorities; several concern closely related maternity/childcare rights rather than the statutory six-hour system in its current form. That distinction matters because Japan's statutory framework has been amended over time.