How do you build the labour arrangements for teachers at a Japanese-language school? Variable working hours, headcount conversion and social insurance

Bottom line first: Teachers at a Japanese-language school involve the busy-and-slack swing between term and long vacation, the split between full-time and part-time, and foreign teachers' residence status all at once, so you design variable working hours, the judgement on social insurance, and the notice of working conditions together. Scheduled hours concentrated in the teaching term can be arranged with a yearly variable working-hours system (Labour Standards Act Article 32-4), averaging out against the lighter schedule in vacation to stay within statutory hours. Even a part-time lecturer becomes insured if scheduled hours and days reach three-quarters of a regular teacher's, or, below that, if they meet requirements such as 20 hours a week (three-quarters rule and expanded coverage for short-hour workers). The accreditation application for a certified Japanese-language education institution and foreign teachers' residence status are the area of a Gyoseishoshi, and tax that of a tax accountant, each contracted separately as an independent business entity. How headcount is counted under the accreditation standards themselves is under the Minister of Education, Culture, Sports, Science and Technology.

This page focuses on how to design the highly seasonal work of a Japanese-language school teacher through working hours, social insurance and the notice of working conditions.

How does treatment differ between full-time and part-time teachers at a Japanese-language school?

Treatment under the Labour Standards Act and social insurance turns not on the label "full-time or part-time" but on the actual scheduled hours and days and the content of the contract. A Japanese-language school typically mixes head teachers and full-time teachers with many weekly periods and no fixed term, and part-time lecturers who take only a few periods a week; as both are workers, the rules on working hours, breaks, holidays and premium wages apply to each.

Category	Typical work	Main labour issues
Full-time teacher	Long weekly scheduled hours, also school duties	Designing variable working hours; social insurance in principle applies
Part-time lecturer	Works only the periods they take	Social-insurance judgement (three-quarters rule, expanded coverage); treatment of preparation time
Fixed-term teacher	A set term such as one year	Notice of working conditions (renewal cap, open-term conversion), the view on refusal to renew

Note that the headcount conversion used to count "number of teachers" under the accreditation standards for a certified Japanese-language education institution is separate from whether someone joins social insurance. Headcount under the accreditation standards is under the Minister of Education, Culture, Sports, Science and Technology and is an issue for the accreditation application. On the labour side, you design the working-hours system and social-insurance enrolment based on each person's actual scheduled hours and days. If a contract is fixed-term such as one year, you also arrange open-term conversion (The practice of the open-term conversion rule).

Can a variable working-hours system handle the term-and-vacation swing?

It can. A Japanese-language school is a clearly seasonal workplace: busy with lessons and events during term, and lessons stopping over the long summer, winter and spring vacations. A yearly variable working-hours system (Labour Standards Act Article 32-4) lets you allot scheduled hours over the long unit of a year with this swing in mind. If the average over the target period stays within 40 hours a week, you can allot more scheduled hours in busy weeks and fewer in vacation.

System	Basis	How it is set	Fit for a Japanese-language school
Yearly variable working hours	Labour Standards Act Article 32-4	Conclude a labour-management agreement and file with the Labour Standards Inspection Office	Allots the term/vacation swing over a year — heavy in term, light in vacation
Monthly variable working hours	Labour Standards Act Article 32-2	Set in work rules or the like, or a labour-management agreement	When you want to vary the allotment of lesson weeks and exam/admin weeks within a month

A yearly variable system has limits: where the target period exceeds three months, you design within a frame such as no more than 280 working days a year and not exceeding 10 hours a day or 52 hours a week. Fall outside the frame and premium wages arise (Labour Standards Act Article 37). Choosing a system is set out in Choosing variable working hours and flextime, and the overtime cap for peak periods in How far can a 36 Agreement allow overtime. Which unit of variable system fits turns on how terms are divided and the share of part-timers, so the drop-down into a concrete annual calendar is designed case by case (unverified).

Do part-time lecturers come under social insurance and employment insurance (headcount conversion)?

They can. For social insurance (health insurance and employees' pension insurance), a person is insured if their weekly scheduled hours and monthly scheduled days reach three-quarters of a regular teacher's at the same worksite. Below three-quarters, at a specified covered worksite (constantly 51 or more insured; lowered to 51 or more from October 2024) a person is insured if they meet all of: 20 or more scheduled hours a week, scheduled monthly wage of 88,000 yen or more, an employment prospect exceeding two months, and not being a student.

System	Rough threshold for enrolment
Social insurance (three-quarters rule)	Weekly scheduled hours and monthly scheduled days both three-quarters or more of a regular teacher's
Social insurance (expanded coverage for short-hour workers)	At a specified covered worksite (constantly 51+), meeting all of 20+ hours a week, 88,000 yen+ a month, over-two-month prospect, not a student
Employment insurance	20 or more scheduled hours a week and an employment prospect of 31 or more days

The "scheduled hours" that form the basis of this judgement depend on how far you include, beyond lesson periods, time under the employer's direction such as preparation and marking. Even on the per-period pay common for part-timers, a change in the fixed wage bears on the occasional revision of the standard monthly remuneration (When does the occasional revision of the standard monthly remuneration happen). The three-quarters rule and short-hour workers are in Social insurance for short-hour workers and the three-quarters rule, and the course of expanded coverage in How far will the expansion of social-insurance coverage go. Which lecturer actually becomes covered turns on how the schedule and wages are set, so we do not conclude on the individual case here (unverified).

How do residence status and labour fit together when hiring a foreign teacher?

Being able to work within the scope of the residence status (an immigration issue) and not discriminating in working conditions by nationality (a labour issue) stand separately. The Labour Standards Act provides that an employer must not discriminate in wages, working hours or other working conditions by reason of nationality (Article 3, equal treatment). A foreign teacher's working-hours system, social insurance and premium wages are designed on the same basis as Japanese full-time and part-time teachers.

Issue	Whose area	Content
What activity and how many hours are allowed under the residence status	Gyoseishoshi, Immigration Services Agency	Residence status of a teacher at a certified institution, whether activity outside status is allowed
Equal treatment of working conditions	Shakai Hoken Roumushi (labour)	Prohibition of discrimination in working conditions by reason of nationality (Labour Standards Act Article 3)
Notice of working conditions	Shakai Hoken Roumushi (labour)	Consideration for notice in a way a foreign worker can understand

The notice of working conditions calls for consideration so that foreign workers too are given it in a way they can understand, such as their native language (Notice of working conditions to foreign workers and native-language consideration). The scope of activity allowed under the residence status and whether out-of-status activity is permitted are determinations of immigration administration and, together with the accreditation application, the area of a Gyoseishoshi. The overall picture of hiring and residence of foreign personnel is in Hiring and residence of Technical/Humanities/International and Chinese/Taiwanese personnel. 四葉社会保険労務士事務所 handles the labour design, while residence status and the accreditation application are a Gyoseishoshi's — each contracted separately as an independent business entity.

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How do you reconcile the teacher requirements in the accreditation standards with the notice of working conditions?

A certified Japanese-language education institution has teacher and head-teacher requirements in the accreditation standards, and meeting them is an issue for the accreditation application (to the Minister of Education, Culture, Sports, Science and Technology). Separately, at the stage of hiring and employing, the notice of working conditions under the Labour Standards Act is required. The revision effective 1 April 2024 added items that must be notified.

Timing of notice	Main items to notify (including the 2024 additions)
On concluding the labour contract	Scope of change of workplace and duties, wages, working hours, contract term, etc.
On concluding/renewing a fixed term	Whether there is a renewal cap (ceiling on total contract term or number of renewals) and its content
On a renewal where the right to apply for open-term conversion arises	That one may apply for open-term conversion, and the working conditions after conversion

For part-time lecturers hired on a fixed term, the notice of the renewal cap and open-term conversion especially bites (Scope of the 2024 change to the working-conditions notice rule). Working hours, holidays and wages are also mandatory items in work rules, and a worksite constantly with 10 or more must prepare and file them (From how many employees are work rules mandatory). The judgement on the teacher requirements in the accreditation standards themselves is under the Minister and not gone into here (unverified). On the labour side, you align the notice items and work rules so they do not conflict with the accreditation-application structure.

What can 四葉社会保険労務士事務所 do?

What this office takes on is designing the labour of Japanese-language school teachers safely from the sides of seasonality, full-time/part-time and social insurance.

• Designing yearly and monthly variable working-hours systems matched to the term/vacation swing, and preparing the labour-management agreement, work rules and filing
• Judging part-time lecturers' social-insurance and employment-insurance enrolment (three-quarters rule, expanded coverage) and reflecting per-period pay and preparation time in scheduled hours
• Notice of working conditions for fixed-term teachers (renewal cap, open-term conversion) and preparing work rules
• Equal treatment of foreign teachers and consideration for notice in a way they can understand

The accreditation application for a certified Japanese-language education institution and foreign teachers' residence status are the area of a Gyoseishoshi, and tax that of a tax accountant. 四葉社会保険労務士事務所 accepts the labour design and procedures as an independent business entity, and the accreditation application, residence status and tax are contracted separately with the respective qualified professionals.

Consultations are free of charge. Fees are in the fee schedule; see also our services and how a consultation proceeds.

Frequently asked questions

Q. Do we pay teachers over the summer vacation when there are no lessons?
A. Full-time teachers whose employment contract continues are paid the wage set in the contract regardless of whether there are lessons. A yearly variable working-hours system (Labour Standards Act Article 32-4) that allots scheduled hours with the swing in mind lets you design heavy scheduled hours in term and light in vacation, averaging within 40 hours a week over the year. If you treat the vacation as a layoff, you must consider leave allowance (Article 26). Part-time lecturers depend on the contract.

Q. Can a part-time lecturer with only a few periods a week join social insurance?
A. If scheduled hours and days are three-quarters or more of a regular teacher's, they are insured. Below that, at a specified covered worksite with 51 or more insured, they are insured if they meet all of 20+ hours a week, 88,000 yen+ a month, an over-two-month employment prospect and not being a student (expanded coverage for short-hour workers). Even on per-period pay, a change in the fixed wage bears on the occasional revision of the standard monthly remuneration.

Q. Are foreign teachers' working hours on a different basis from Japanese teachers'?
A. No. The Labour Standards Act prohibits discrimination in working conditions by reason of nationality (Article 3), and working hours, premium wages and social insurance are designed on the same basis as Japanese teachers. What differs is the scope of activity allowed under the residence status, which is a determination of immigration administration and, with the accreditation application, the area of a Gyoseishoshi. On the labour side, you take care to notify working conditions in a way the person can understand.

Q. Is the headcount conversion in the accreditation standards the same as the social-insurance judgement?
A. They are separate. The headcount conversion used to count teachers under the accreditation standards is under the Minister of Education, Culture, Sports, Science and Technology and is an issue for the accreditation application. Whether someone joins social insurance is judged by applying each person's actual scheduled hours and days to the three-quarters rule or the expanded-coverage requirements. Even if the accreditation count is met, whether each lecturer is insured must be checked separately.

Basis for this article

• Labour Standards Act (Act No. 49 of 1947) Article 3 (prohibition of discrimination in working conditions by reason of nationality, creed or social status — equal treatment), Article 32 (working hours = 40 a week, 8 a day), Article 32-2 (monthly variable working hours), Article 32-4 (yearly variable working hours; a labour-management agreement and filing with the administrative authority are required), Article 26 (leave allowance), Article 37 (premium wages for overtime, holiday and late-night work), Article 89 (duty to prepare and file work rules)
• Labour Standards Act Article 15 and Enforcement Regulation Article 5 (notice of working conditions; the revision effective 1 April 2024 added to the items the scope of change of workplace and duties, the renewal cap for fixed-term contracts, and matters on applying for open-term conversion and the working conditions after conversion at a renewal where the right arises)
• Health Insurance Act (Act No. 70 of 1922) and Employees' Pension Insurance Act (Act No. 115 of 1954) — insured if three-quarters or more of a regular worker's scheduled hours and days; at a specified covered worksite (constantly 51+ insured; lowered to 51+ from October 2024), short-hour workers are insured on the requirements of 20+ hours a week, scheduled monthly wage of 88,000 yen+, an over-two-month employment prospect, and not being a student
• Employment Insurance Act — insured with 20 or more scheduled hours a week and an employment prospect of 31 or more days
• Act on the Accreditation etc. of Japanese-Language Education Institutions for Appropriate and Certain Implementation of Japanese-Language Education (Act No. 41 of 2023; effective 1 April 2024) — accreditation of a certified Japanese-language education institution (by the Minister of Education, Culture, Sports, Science and Technology) and the teacher and head-teacher requirements. The specifics of the accreditation standards are set by ministerial ordinance and notification, and judging whether they are met is under the Minister (as of 3 October 2026)
• The drop-down into a school's own calendar of the limits on yearly variable working hours (280 working days a year where the target period exceeds three months, 10 hours a day, 52 hours a week), which lecturer becomes insured, and whether the teacher requirements in the accreditation standards are met turn on how terms are divided, how wages are set and individual circumstances. This article does not conclude on the individual case (unverified)

This article is general information. Individual determinations are made by a qualified professional after a consultation. 四葉社会保険労務士事務所 can advise on designing variable working-hours systems matched to the term/vacation swing and preparing the labour-management agreement, work rules and filing, judging part-time lecturers' social and employment insurance, the working-conditions notice and open-term conversion for fixed-term teachers, and equal treatment and understandable notice for foreign teachers. The accreditation application for a certified Japanese-language education institution and foreign teachers' residence status are the area of a Gyoseishoshi, and tax that of a tax accountant; 四葉社会保険労務士事務所 accepts work as an independent business entity and contracts separately with the respective qualified professionals. Frequently asked questions are collected in the FAQ. Written by Joji Uramatsu (Shakai Hoken Roumushi, Gyoseishoshi, Registered Real Estate Transaction Specialist).