Service Overtime and the Karoshi Discourse
Service Overtime and the Karoshi Discourse explains why unpaid overtime persists in Japan, how overwork deaths pushed the law to change, and what an employee can do about it.12 If your payslip shows no overtime pay for late nights you actually worked, this article gives you the legal frame, the cap numbers, and the escalation path.
Procedures, fees, and requirements can change. Confirm current details at the Ministry of Health, Labour and Welfare (MHLW). This article is general information, not legal, tax, or immigration advice; for your specific case, consult a licensed bengoshi (lawyer) or shakai hoken roumushi (labor and social security attorney) for unpaid-wage claims, contested hours, or health-harm cases.
Overview
This article is for all employees working in Japan, on any work-permitting status of residence, and for Japanese nationals alike.3 The Labor Standards Act applies irrespective of nationality, and Article 3 bars differential treatment on wages or hours by reason of nationality.4
The rules below are national law, so there is no ward or municipal variance to chase.4 What varies workplace to workplace is whether your employer tracks hours honestly, files a genuine agreement, and pays what the statute requires. Company size and industry explain more of that variance than geography does.56
What Service Overtime Means in Practice
The サービス残業 (sabisu zangyo, "service overtime") pattern means overtime hours worked but neither reported nor compensated, often under cultural pressure rather than explicit orders.1 It is unreported, unpaid overtime given to the company, and official guidance treats it as a violation to eliminate rather than dedication to tolerate.7
Companies sometimes cap the overtime they allow workers to claim while leaving the workload unchanged, so staff work the gap off the record.1 That pressure rarely arrives as a written order. It arrives as a team norm, a manager hint, or a spreadsheet that never seems to accept more than a round number.
How hours go unreported
Reported hours and real hours can diverge sharply. In the Dentsu case, the worker logged 69.9 and 69.5 hours while the inspection decision ultimately certified about 105 hours of overtime in the peak month, and the family lawyer stated managers told staff not to record overtime beyond 70 hours.8 The certified month ran to more than 2.5 times the prior month.89
Working time is judged by whether you are under the employer's direction, not only by what the timecard says.7 Post-clock-out messages, waiting under instruction, and take-home tasks ordered from above can count as working time even after you have clocked out.7
Employers must track hours by objective means such as timecards or PC logs, and self-reporting alone requires verification measures.7 When the company system depends on self-reports with no checks, that gap is itself a compliance signal worth noting.
Lawful overtime versus service overtime
Lawful overtime is work beyond statutory limits performed under a concluded and filed 36 agreement, inside the caps, and paid at the Article 37 premium.47 Service overtime is the same extra work performed without reporting and without that premium. The difference is paperwork plus pay, not effort or loyalty.1
A fixed overtime scheme, where salary includes a stated block of overtime hours, is distinct from service overtime and is not automatically unlawful.3 The fixed sum covers only its stated hours. Measured overtime beyond the block still draws the premium as a shortfall, so a fixed figure never excuses unpaid hours above it.3
Hours beyond your contract schedule but inside the statutory 8-hour and 40-hour frame are contractual rather than statutory overtime.7 They do not count toward the 36-agreement caps, though your work rules may still price them. The service-overtime question starts at the statutory line.
Why the Law Treats It as Unlawful
Unpaid overtime is not a gray custom the law tolerates. Three statutory duties combine to make it a violation: stay within statutory hours, get an agreement before exceeding them, and pay the premium for the excess.47
The diagram above shows the lawful sequence in order. Each step is a precondition for the next, and service overtime skips the reporting and payment steps at the end.
Statutory hours and the agreement precondition
Article 32 caps ordinary working time at 40 hours per week and 8 hours per day, excluding breaks.47 Article 35 requires at least one day off per week, or at least four days off per four-week period.47
The 三六協定 (saburoku kyotei, "36 agreement") is the Article 36 labor-management agreement that is the legal precondition for overtime or holiday work.47 Article 36(1) allows extended hours or work on days off only where the employer has concluded a written agreement with the majority union, or the majority worker representative where no union exists, and filed notice with the Labor Standards Inspection Office.4 Requiring overtime beyond statutory limits without a concluded and filed agreement is unlawful.7
Article 3 prohibits differential treatment by nationality on wages and working hours, so the precondition applies to foreign staff on the same terms.4 A valid worker representative must cover all workers, including part-time, contract, and foreign staff.7 Article 104 lets any worker report violations to the inspection organization.4
Companies with healthy overtime cultures can state their 36-agreement caps specifically and show the filed document.7 Vague answers about limits tell you something about how the workplace operates.
Premium pay and hour records
Article 37 requires premium wages for overtime, holiday, and night work at legally set minimum rates.47 Standard overtime within 60 hours a month carries at least a 25 percent premium.7 Work on a statutory day off carries at least a 35 percent premium.7 Night work between 10 p.m. and 5 a.m. carries at least a 25 percent premium.7 Overtime beyond 60 hours in a single month carries at least a 50 percent premium.7
Employers must ascertain hours by objective means in principle, and self-reports alone need confirmation that the declared time is accurate.7 Keep your own evidence alongside the company system from the first month you notice a gap. Login records, messages, and daily logs matter later.
Violating the hours and cap rules carries criminal penalties of up to six months imprisonment or a fine of up to 300,000 yen under Article 119.47 Article 109 requires employers to preserve wage ledgers and related records for the statutory period, which is why the claim window below tracks record preservation.10
Karoshi and the Push Toward Reform
The 過労死 (karoshi, "death by overwork") discourse turned a workplace custom into a legislative cause. Fatal strokes, heart attacks, and suicides linked to excessive hours were no longer treated as private tragedies once inspectors, courts, and bereaved families put numbers to them.28
The cases and the recognition line
Matsuri Takahashi joined advertising firm Dentsu in April 2015 and died by suicide on December 25, 2015.8 The Mita Labor Standards Inspection Office recognized the death as work-related after depression from a sharp overtime increase.8 She worked about 105 hours of overtime in the month from October 9, 2015, more than 2.5 times the prior month.89
The 2014 Act Promoting Measures to Prevent Death and Injury from Overwork defines the category in law: death by cerebrovascular or heart disease from work overload, death by suicide from work-induced mental disorder, or the underlying disease or disorder itself.2 The Act requires the government to research the problem, report annually to the Diet, and maintain a consultation system.2
Compensation practice uses an administrative recognition criterion often called the karoshi line. About 100 hours of overtime in the month before onset, or an average above about 80 hours per month over two to six months before onset, marks a strong work-disease relationship.11 Crossing the line does not automatically award a claim, and staying below it does not guarantee safety. Each case still needs investigation of hours and medical facts.11
In FY2024 the government approved 241 brain and heart disease cases, including 67 fatal ones, alongside 1,055 mental disorder cases including 88 suicides and attempts, with mental cases rising since 2019 (as of 2025-09; confirm current figures with MHLW).12 The mental-disorder share now dominates approvals, which is why the reform story does not end with cardiac cases alone.12
What the reform changed
Before the reform, special-clause agreements could effectively remove the upper limit on overtime through ministerial guidance with no binding force.75 The Work Style Reform legislation passed on June 29, 2018 made the caps legally binding with penalties, effective April 2019 for large employers and April 2020 for small and medium enterprises.75
The baseline is now 45 hours of overtime per month and 360 hours per year, with a special-clause annual ceiling under 720 hours plus single-month and averaging constraints detailed in the next section.47 Construction, transport drivers, and doctors carried a deferral ending April 2024; doctors and drivers kept higher annual frames rather than the general 720.5
The same package requires employers to secure at least five days of annual paid leave taken where workers hold ten or more days.7
Overtime Caps After the Work-Style Reform
The caps below are the post-2019 statutory frame. They have not moved since phase-in, and the table states them as statute rather than trend (as of 2019-04 and 2020-04 phase-in; confirm current figures with MHLW).47 Check your own heaviest month against the single-month row first, then the year.
| Limit | Cap |
|---|---|
| Standard monthly cap | 45 hours/month47 |
| Standard annual cap | 360 hours/year47 |
| Absolute annual ceiling with special clause | Under 720 hours/year47 |
| Single-month combined overtime plus holiday work | Under 100 hours47 |
| Multi-month average over any 2 to 6 consecutive months | 80 hours/month or less47 |
| Months per year above 45 hours | Maximum 6 months47 |
A special clause may allow temporary extension beyond 45 hours per month only for an ordinarily unforeseeable, significant workload increase.47 Even then, every hard ceiling above still applies: the under-100-hour single month, the 80-hour rolling average, the under-720-hour year, and the 6-month frequency limit.47 Chronic operation at special-clause levels without genuinely temporary grounds misuses the clause, even when the paperwork exists.
Holiday work hours do not build toward the 60-hour trigger for the 50 percent overtime rate, but they do count toward the single-month 100-hour and rolling-average 80-hour tests.7 Readers who mix the two categories will misjudge which ceiling their longest month hits.
Improvement and Persistence in Pockets
The honest picture is split. Large firms have largely cleaned up time tracking and claiming, while smaller firms and certain industries lag. Neither the success story nor the failure story alone is accurate.56
Where cleanup is most visible
The share of male employees working 60 hours or more per week fell from 2016 to 2020 and stabilized after the amendment, with larger firms clustering just below the 60-hour threshold (as of 2024-01; confirm current figures with MHLW).5 Phase-in started with large employers, and objective time tracking plus filed agreements became the compliance baseline.7
Where lag persists
Targeted supervision still finds widespread violations. In FY2023 supervision of 26,117 workplaces suspected of long hours, 11,610 (44.5 percent) had illegal overtime, and 5,675 of those exceeded 80 hours per month on overtime plus holiday work (as of 2024-07; confirm current figures with MHLW).6 Supervision targets suspected workplaces, so the rate does not describe all employers. It does show the problem concentrates rather than disappears.6
In 2022, over-60-hour weeks persisted at 27 percent of doctors, 30 percent of professional drivers, and 10 percent of construction workers, with 14 percent of doctors and 11 percent of drivers at 70 hours or more (as of 2024-01).5 Service-sector over-60-hour rates stayed above 17 percent in 2022 while clerical work fell to about 5 percent (as of 2024-01).5 Nearly 30 percent still exceed two hours of overtime daily even five years after the amendment (as of 2024-01).5
Commentary in 2026 discusses a possible inspection-guidance shift toward health-measure checks and a Diet-level review of hour rules, but no fetched primary source confirms a statutory change, so this article states the caps as binding (as of 2026-08).13 Treat talk of relaxation as review discussion, not law, until an MHLW or Diet source says otherwise.13
Foreign Employees: Strict Rule, Uneven Practice
The Labor Standards Act applies to all workers regardless of nationality or visa type, so overtime rights do not depend on status of residence.3 Your employer cannot legally withhold the premium because you are foreign, new, or on a specific visa.34
In compliant firms, foreign staff often face stricter hour control than the old norm, because HR applies the tracking rules uniformly.3 Where exploitation happens, language barriers and visa-linked pressure deter reporting, and hours go unrecorded longer than they would for a confident complainant.3 Practitioner sources describe this split qualitatively; no fetched statistical series isolates foreign-worker overtime rates, so treat it as a documented practice risk rather than a measured gap.3
MHLW maintains multilingual consultation channels for exactly this situation, including the Labour Standards Advice Hotline in 13 languages and the Telephone Consultation Service for Foreign Workers (as of 2026-08; confirm current schedules with MHLW).1415 Language support exists before any formal complaint, so uncertainty about Japanese is not a reason to stay silent.1415
The 労働基準監督署 (rodo kijun kantokusho, "Labor Standards Inspection Office") is the front-line enforcement body for the Act.14 The 労働局 (rodo kyoku, "Labor Bureau") is the prefectural body hosting consultation corners and mediation.16 The 割増賃金 (warimashi chingin, "premium wages") label refers to the Article 37 increased rates.7
What to Do If You Face Service Overtime
Work the ladder from the bottom up. Records come first, internal questions second, and outside help third. Each step strengthens the next one.316
The chart above maps the escalation this section follows. You can enter at any stage, but earlier stages make later ones faster.
Keep your own hour evidence
Keep login and logout records, after-hours messages, daily task and time logs, transit records, and payslips alongside the company system.3 Preserve schedule screenshots and employer messages from the first month a gap appears. Memory fades faster than the claim clock runs.310
Raise it inside, then escalate outside
Ask HR for the filed 36 agreement and read its monthly and annual figures.7 The employer must make the agreement known to workers, including by display or ready availability.7 If HR cannot produce the document, that gap is itself a compliance signal worth noting.
The Labour Standards Advice Hotline offers free anonymous consultation on weekday evenings from 17:00 to 22:00 and on weekends and holidays from 09:00 to 21:00, closed December 29 to January 3 (as of 2026-08; confirm current hours with MHLW).14 Foreign-language lines cover 13 languages with language-specific days, and the foreign-worker consultation page lists current schedules (as of 2026-08).1415
You can approach the office anonymously for initial guidance, and a report may trigger inspection, correction orders, follow-up, or prosecutorial referral in serious cases.316 A named complaint with supporting evidence is generally most effective where significant unpaid wages are at stake.16 Prefectural Labor Bureau consultation corners offer free mediation where both sides agree, often the fastest route for smaller amounts.316
Unpaid-wage claims for paydays on or after April 1, 2020 carry a three-year interim prescription measured from each payday, with a five-year principle pending future designation.10 Older months expire first, so start the personal log the first day you notice the gap rather than waiting for the dispute to ripen.
For large amounts or refusal after orders, the Labor Tribunal, typically three to six months, or civil court remains the final route with a labor lawyer.3 Community unions can also negotiate on a member behalf where individual talks stall.16
Good to know
A fixed-overtime figure is not permission for unpaid hours
Workers frequently read a fixed-overtime figure as a ceiling on what they can be paid. Legally it is a floor: once actual qualifying overtime exceeds the hours the fixed sum was calculated to cover, the employer must pay the difference.3 Check the stated block against measured hours every month.
Holiday hours and the single-month ceiling combine
The under-100-hour single-month test adds overtime and statutory-holiday work together.47 A heavy holiday-work month can breach the ceiling even when pure overtime looks compliant on its own. Track the two categories separately, then add them for this test.
The claim clock runs from each payday
The three-year interim prescription runs from each monthly payday for post-April-2020 wages, so older months expire first.10 A complaint filed this spring recovers fewer months than the same complaint filed last autumn. Early documentation preserves more of the total.
An agreement on file does not authorize unlimited overtime
A concluded and filed 36 agreement permits overtime only within its figures and the statutory ceilings.47 Chronic operation at special-clause levels without genuinely temporary grounds misuses the clause, even when the paperwork exists. Paper plus practice must both comply.
The 80-hour line is a recognition criterion, not a safety threshold
Months near or above 80 hours of overtime strengthen a workers-compensation case, but the line is an administrative recognition criterion rather than a medical safety guarantee.11 Below-line months can still harm health, and above-line cases still need hour and medical proof. Do not use the line as a personal safety budget.11
See also
- Overtime, Working Hours, and the 36-Agreement
- Reading a Japanese Employment Contract
- Paid Leave (Yukyu-Kyuka) and How It's Taken
- Compensation Components Beyond Base Salary
- The Labor Tribunal (Rodo-Shinpan)
- Labor Unions: Enterprise vs. Local Unions