Japan's Labor Standards Act: Working Hours and Premium Pay

Japan has undertaken a comprehensive legal overhaul of its working hour framework. These reforms go beyond simply regulating hours — they are designed as structural mechanisms to protect worker health and establish a sustainable foundation for business growth.

This article examines Japan's working hour system and premium pay standards, with practical takeaways for HR managers overseeing overseas entities, branch offices, or global workforces.

Article 32 of Japan's Labor Standards Act establishes the fundamental principle governing working hours. As a general rule, working hours may not exceed 8 hours per day or 40 hours per week, and any work beyond these limits is legally restricted. However, where a 変形労働時間制 (variant working hour system) has been adopted, working hour adjustments are permitted within a defined period — provided the average weekly working hours remain within 40 hours.

To allow working hours beyond the statutory limits, employers must enter into a written agreement with employees — known as the ‘36 Agreement’ (36協定) — and notify the relevant administrative authority.

💡 More detail
The 36協定 (さんじゅうろくきょうてい, San-juu-roku Kyoutei) refers to the “Agreement on Overtime and Holiday Work.” When concluding a 36協定, the employer must enter into a written agreement at each workplace — either ① with the trade union that represents a majority of workers (a majority union), if one exists, or ② with a person who represents a majority of workers (a majority representative), if no such union exists.
If the conditions for ① are not met, or if the majority representative under ② is not properly elected, any 36協定 filed with the 労働基準監督署 (Labour Standards Inspection Office) will be invalid — and employees cannot be required to work overtime or on holidays beyond statutory limits.

- Reference: Japan Ministry of Health, Labour and Welfare and the Ministry's publication on Proper Conclusion of the 36協定

Even where a 36協定 has been concluded, overtime is subject to statutory caps. In general, monthly overtime may not exceed 45 hours and annual overtime may not exceed 360 hours. Even under special provisions, single-month overtime must remain below 100 hours, annual overtime may not exceed 720 hours, and the average across any 2-to-6-month period must remain within 80 hours per month. Japan's system is thus structured to set a clearly defined ceiling on total working hours, with overtime permitted only as a defined exception.

In exceptional circumstances — such as natural disasters or urgent business needs — temporary exceedance of the cap is possible with administrative approval, but even this process is strictly managed. The system is expressly designed to protect worker health and prevent sustained long working hours.

For reference, Korea also sets the statutory working day at 8 hours and the working week at 40 hours, and permits overtime by labor-management agreement — making the basic structure similar. The key difference is that Japan manages overtime primarily through monthly and annual cumulative caps, while Korea's framework centers on weekly limits.

💡 Relevant legislation
- Labor Standards Act, Article 32 (Working Hours)
- Labor Standards Act, Article 36 (Overtime and Holiday Work)

Overtime work in Japan is permissible only where a 36協定 has been concluded under Article 36 of the Labor Standards Act and duly reported to the relevant administrative authority. Even with this agreement in place, overtime is not unlimited — the law imposes clear monthly and annual caps alongside health protection standards.

As a general rule, overtime may not exceed 45 hours per month or 360 hours per year. Where unavoidable circumstances — such as a temporary surge in workload — arise, special provisions may be agreed upon by labor and management. Even then, strict limits apply: single-month overtime must remain below 100 hours, annual overtime may not exceed 720 hours, and the average over any 2-to-6-month period must not exceed 80 hours per month.

Japan's overtime framework is therefore structured not around specific weekly thresholds, but around monthly and annual cumulative totals and rolling averages — designed to prevent the gradual accumulation of excessive hours. Even where special provisions apply, robust legal safeguards ensure that worker health protection remains the overriding priority.

Under Article 37 of Japan's Labor Standards Act, where an employee works beyond the statutory hours (8 hours per day, 40 hours per week), on a statutory holiday, or during late-night hours (22:00–05:00), the employer must pay a premium on top of the regular wage. The premium rates are clearly defined in law by work type.

For example, overtime worked during late-night hours attracts a combined premium of 25% + 25%, for a total of 50%. Where late-night work exceeds 60 hours in a single month, the premium rate rises to 75%.

Japan's premium pay system is notable for its granular differentiation by work type and time period, reflecting both the physical demands and intensity of different working conditions. It represents a carefully structured compensation framework aligned with rigorous working hour management.

💡 Relevant legislation: Labor Standards Act, Article 37 (Premium Pay for Overtime, Holiday, and Late-Night Work)

Japan has faced accelerating population decline driven by low birth rates and an ageing society, bringing labor shortages to the forefront of national policy. In response, the government undertook institutional reform aimed at reducing long working hours and improving productivity with a shrinking workforce. At the center of this effort is the Work Style Reform Act, enacted in 2019.

The Reform Act codified overtime caps — previously issued as ministerial guidelines — directly into statute, and established specific standards for working hour management. The statutory working day of 8 hours and working week of 40 hours were maintained, but the conditions for permitting overtime by labor-management agreement were formally incorporated into law. This reform was intended not merely to reduce working hours, but to simultaneously protect worker health and lay the foundation for sustainable business growth.

More recently, growing recognition of the value of efficient working and work-life balance over long hours has driven a broader expansion of flexible work arrangements. According to a July 2025 survey by Gartner Japan, remote work adoption — which stood at around 40% before February 2020 — had risen to over 75% of all Japanese companies as of April 2025.

Japan's working environment is evolving beyond the suppression of long hours — toward a more sustainable model of work through greater diversity in work arrangements and expanded employee autonomy.

💡 Relevant legislation: Act for Partial Revision of the Labor Standards Act and Other Acts for the Promotion of Work Style Reform

Working hour management, work-life balance, and flexible work arrangements have become pressing priorities in Korea as well. Japan's ongoing transformation — pursuing both higher quality of working life and improved productivity — offers a relevant reference point.

Building a working framework that satisfies both organizations and employees requires effective attendance management as a foundation. For companies operating overseas entities or global sites, the ability to accurately reflect each country's working hour regulations and premium pay standards within a unified attendance management system is becoming increasingly important.