Foreign companies hiring into Japan for the first time, particularly those coming from at-will jurisdictions where overtime is a matter of manager discretion, consistently underestimate one layer of Japan employment law: working-time regulation. Gross salary, social insurance contributions, and tax withholding get modeled early because they show up on an invoice. Working-hour compliance does not show up anywhere until it becomes a liability: a wage claim, a labor authority inspection, or a back-pay demand. Under an Employer of Record (EOR) arrangement, Aplash is the legal employer of the worker and carries the statutory obligation to enforce Japan's working-time rules correctly. This guide explains the structure the EOR provider is actually enforcing on the foreign company's behalf, so the company understands what it is and is not responsible for, and what exposure follows when the structure is applied incorrectly.
The Statutory Baseline: 8-Hour Day, 40-Hour Week
The Labor Standards Act (労働基準法) sets the default working-hour ceiling at eight hours per day and forty hours per week. This is the statutory baseline, not a target or a norm negotiated per contract. Any work beyond that ceiling is, by definition, overtime, and overtime is not automatically lawful simply because the employee agrees to work it or the employer needs the output.
This is the single most common point of friction for foreign companies used to jurisdictions where overtime is unregulated or governed only by internal policy. In Japan, the ceiling is a legal floor for when the overtime regime engages, not a scheduling preference. An EOR arrangement does not relax this ceiling for the foreign company's convenience; Aplash, as legal employer, must apply it to every hour actually worked, regardless of how the foreign company internally labels the arrangement (fixed salary, exempt role, results-based compensation, or otherwise). Job title and compensation structure do not, on their own, remove an employee from the statutory working-hour framework.
No Overtime Without a Valid 36 Agreement (36協定)
Before any employee can lawfully work beyond the statutory 8-hour/40-hour baseline, or on a designated rest day, the employer must have a valid labor-management agreement in place under Article 36 of the Labor Standards Act, commonly referred to as a 36 Agreement (36協定). This agreement is negotiated with employee representatives (or, where applicable, a labor union) and must be filed with the Labor Standards Inspection Office (労働基準監督署), the local enforcement arm of the Ministry of Health, Labour and Welfare (厚生労働省).
Two points are frequently missed by foreign companies new to the Japan market:
(a) The agreement must exist and be filed before overtime is worked, not after. An EOR provider that allows overtime to occur without a filed 36 Agreement in place has created an unlawful working arrangement, and the exposure attaches to the entity that stands as legal employer of record.
(b) The agreement is not a blanket authorization. It sets the specific terms, caps, and categories under which overtime is permitted for that workplace. Overtime worked outside the scope of the filed agreement is not protected by it, even where the agreement itself is valid.
The current statutory caps on monthly and annual overtime hours, including any special provisions for temporary or extraordinary business circumstances, are set by law and are the kind of figure that must be confirmed against the current text of the Labor Standards Act or directly with the EOR provider handling the filing, rather than assumed from prior knowledge or industry rules of thumb. This guide intentionally does not restate specific hour caps as if they were fixed reference numbers; confirm current limits with the EOR provider or the Ministry of Health, Labour and Welfare before scheduling any overtime that approaches a threshold.
Overtime Premium Pay: A Layered Structure, Not a Flat Rate
Japan's overtime premium is not a single flat surcharge applied uniformly to every extra hour worked. It is a layered structure, and the layers stack depending on when and under what circumstances the work occurs.
(a) Standard overtime. A premium above the base hourly rate applies to hours worked beyond the statutory daily or weekly ceiling.
(b) Late-night work. A separate premium applies to hours worked within a statutorily defined nighttime window, regardless of whether those hours also count as overtime.
(c) Rest-day and holiday work. A distinct, generally higher premium applies to work performed on a designated statutory rest day, as opposed to ordinary overtime on a working day.
(d) Compounding. Where categories overlap, for example late-night hours that are also overtime hours, or holiday work performed at night, the premiums compound rather than one simply replacing the other.
(e) Elevated premium above a monthly overtime threshold. Once an employee's monthly overtime crosses a statutory threshold, the applicable premium rate increases for the hours above that threshold, with treatment that can differ by company size.
The exact premium percentages attached to each category are set by the Labor Standards Act and its implementing regulations. Confirm the current premium percentages applicable to a specific role and work pattern with the EOR provider before relying on any figure for budgeting or payroll design.
Minimum Wage: Prefecture-Specific, Reviewed Annually
Japan does not operate a single national minimum wage figure. Each of Japan's forty-seven prefectures sets its own minimum wage rate under the framework of the Minimum Wage Act, and these rates are reviewed and revised on an annual cycle. Metropolitan prefectures generally set materially higher floors than rural prefectures, and certain industries carry a separate, sector-specific minimum wage in some prefectures that can sit above the general prefectural rate.
For a foreign company hiring through an EOR, the practical implication is straightforward but easy to get wrong: the applicable minimum wage is determined by where the employee is actually based and working, not by where the foreign company's headquarters sits, not by the currency the salary is quoted in, and not by a single company-wide figure applied across every Japan hire regardless of location. A remote employee based in one prefecture and a comparable employee based in another can be subject to different statutory wage floors under the same employment structure.
Do not rely on a minimum wage figure carried over from a prior year, from a different prefecture, or from general market commentary. Confirm the current prefecture-specific rate with the EOR provider at the time of hire, and again whenever the employee's base location changes, rather than treating the figure as fixed for the life of the engagement.
What the EOR Provider Is Actually Responsible for Enforcing
The value of an EOR arrangement on the working-time compliance layer is not administrative convenience. It is that the legal employer of record carries, and must actively enforce, the following:
(a) Correct wage floor application. Identifying the employee's actual work location and applying the current prefecture-specific (and, where applicable, industry-specific) minimum wage rate, and re-verifying it against the annual revision cycle.
(b) Valid 36 Agreement coverage before any overtime is scheduled. Confirming that a current, properly filed agreement exists and covers the specific category of overtime, late-night, or rest-day work being asked of the employee, before that work is scheduled, not after it has already occurred.
(c) Correct overtime premium calculation. Applying the layered premium structure accurately across standard overtime, late-night work, and rest-day work, including correct compounding where categories overlap, and correctly applying the elevated rate once monthly overtime crosses the statutory threshold.
(d) Ongoing monitoring against statutory caps. Tracking actual hours worked against the limits set in the filed 36 Agreement and against the statutory ceiling, and flagging when a work pattern the foreign company is directing is approaching or exceeding a lawful limit.
(e) Compliant time and payroll records. Maintaining the documentation that would be produced to the Labor Standards Inspection Office in the event of an inquiry or inspection.
The foreign company directing the day-to-day work retains responsibility for not instructing hours or a work pattern that the EOR provider has flagged as exceeding what the current 36 Agreement or statutory ceiling permits. The EOR structure allocates the legal employer obligation to Aplash; it does not remove the foreign company's practical responsibility to work within the limits the EOR provider communicates.
What Happens When It Is Done Wrong
Working-time non-compliance in Japan does not surface as a warning letter. It surfaces as a financial and regulatory event, and the exposure typically has two components.
(a) Back-pay exposure. An employee who was paid the wrong overtime premium, denied the applicable late-night or holiday premium, or paid below the correct prefectural minimum wage has a wage claim for the shortfall, calculated retroactively across the period the miscalculation was in effect. Where the error is systemic across multiple pay periods or multiple employees under the same arrangement, the retroactive exposure compounds.
(b) Labor authority intervention. The Labor Standards Inspection Office (労働基準監督署) has authority to investigate, order corrective action, and, in cases involving a Labor Standards Act violation such as overtime worked without a valid 36 Agreement or unpaid statutory premiums, refer the matter for potential penalty. An inspection triggered by one employee's complaint routinely expands into a review of the employer's broader time and payroll records, which is where a single miscalculated case becomes a company-wide back-pay finding.
Both outcomes attach to the entity holding legal employer status. This is precisely why the choice of EOR provider should be evaluated on whether it actively enforces the working-time structure described above, rather than on service fee alone. An arrangement where "EOR" functions as a payroll pass-through without active working-time enforcement leaves the underlying legal exposure unmanaged even though a service fee is being paid.
Practical Guidance for Companies New to Japan's Working-Time Rules
Companies accustomed to at-will employment and unregulated overtime should adjust their operating assumptions in three respects before their first Japan hire goes live. First, treat overtime as something that requires prior lawful authorization (a filed 36 Agreement covering the specific category of work) rather than something the employer can simply direct. Second, request written confirmation from the EOR provider of the current prefecture-specific minimum wage and the current overtime premium structure applicable to the role, rather than assuming figures carry over from a prior hire or a different jurisdiction. Third, treat working-time compliance as a continuous obligation, not a one-time setup step: minimum wage rates revise annually, and an employee's overtime pattern can drift into a threshold that changes the applicable premium without anyone deliberately deciding to change it.
Conclusion
Japan's working-time regime rests on a small number of structural mechanisms: a statutory 8-hour/40-hour baseline, a hard requirement for a valid 36 Agreement before any overtime is lawful, a layered overtime premium structure that compounds across standard, late-night, and holiday categories, and a minimum wage floor set at the prefecture level and revised annually. None of the current numeric rates attached to these mechanisms should be treated as fixed; they should be confirmed against the current text of the Labor Standards Act or directly with the EOR provider before being used for hiring decisions or payroll budgeting. Under an EOR arrangement, Aplash carries the legal obligation to apply these mechanisms correctly; understanding what that obligation actually covers is what allows a foreign company to evaluate whether its EOR arrangement is enforcing the structure, not merely administering a payroll run.
This article is informational only and does not constitute legal, tax, or regulatory advice. Consult a qualified advisor before acting on the content. Minimum wage rates, overtime premium percentages, and statutory overtime caps in Japan are set and revised periodically under the Labor Standards Act (労働基準法) and the Minimum Wage Act; the structural descriptions in this article do not state current figures and should not be relied upon as such. Verify current rates and limits with your EOR provider or the Ministry of Health, Labour and Welfare (厚生労働省) before making hiring, scheduling, or budgeting decisions. Last updated: 2026-07.