Student Part-Time Work in Japan: Why Social Insurance Does Not Apply

Last updated: 31 August 2026

You compare payslips with a Japanese friend and the deductions do not match. Theirs shows health insurance and employee pension. Yours shows income tax and nothing else. It looks like paperwork someone forgot, and like a bill that will arrive later.

Nobody forgot. The system is built this way.

What “social insurance” means here

Japan runs health cover on two tracks.

• Employer health insurance and employee pension. Your company pays half and the rest comes out of your pay. That is what this article calls social insurance
• National Health Insurance and the National Pension. You pay the city office yourself. Students and self-employed people are here

You are on one track, never both. Student part-time workers are normally on the second.

There are two doors into the employer track. The Japan Pension Service publishes both, and students are outside each of them.

The 1.06 million yen wall does not reach students

Start with the door people argue about. At companies with 51 or more employees, a short-hours worker joins social insurance when all three of these are true.

• Scheduled working time of 20 hours a week or more
• Scheduled monthly pay of 88,000 yen or more
• Not being a student

Look at the third one. 88,000 yen a month is 1.056 million a year, and that is the wall people talk about. For a student it was never built. Work more than 20 hours, earn more than 88,000 yen a month, and this door still does not open while you are enrolled.

From October 2027 the company-size condition widens to 36 or more employees. The treatment of students does not change.

The other door is 30 hours a week

The older rule does apply to students. The Japan Pension Service puts it like this.

You become an insured person when both of the following are three-quarters or more of a regular employee’s: (1) scheduled working hours per week, (2) scheduled working days per month. Example: where a regular employee works 40 hours a week and 20 days a month, three-quarters is 30 hours or more a week and 15 days or more a month.

Japan Pension Service, “I work as a part-timer. Am I required to join social insurance?” (translated)

In a separate answer the same agency states that a student who meets this test does become an ordinary insured person. Being a student is not, by itself, an exemption.

But a student visa caps you at 28 hours a week. Thirty is out of reach. While that cap holds, this door stays shut as well. The limit on your work permit is doing double duty as a limit on your insurance.

Four ways you stop counting as a student

The Pension Service lists people who are treated as non-students even while enrolled.

• Those who will keep working at the same employer after graduating
• Those on leave of absence
• Those on an evening course
• Those on a correspondence course, and working adults in graduate programmes

The one that catches people is leave of absence. You take a year out for your health or for family, keep the same job, and depending on the size of the company and your hours you can end up inside the system. Your take-home changes, so tell your employer when you file the leave.

The same applies if you graduate and stay on at the company where you already work part-time. From that point you are treated as a non-student.

Language school students are students too

This is where people guess wrong. The schools on the Pension Service list are high schools, secondary schools, special needs schools, universities including graduate schools, junior colleges, technical colleges, professional training colleges, and miscellaneous schools with a course of one year or more.

Most Japanese language schools are miscellaneous schools running courses of a year or more, so they are in. The agency states that the specific schools are the same ones listed for the student pension exemption, and that list has a separate table for overseas university facilities.

Which means the test is simple: if your school qualifies you for the student pension exemption, it counts here too. The school office can tell you.

What this does to your take-home pay

No health insurance and no employee pension come out of your pay. As a share of your earnings, you keep more than an employee earning the same amount.

In exchange you pay for insurance and pension yourself. That part gets missed.

And both of those payments can be brought down.

• The National Health Insurance reduction takes 70, 50 or 20 percent off the flat part when last year’s income was low. In Tokyo that is 65,200 yen a year down to 19,560
• The student pension exemption defers the 17,920 yen a month National Pension contribution while you are enrolled

Use both and the whole thing comes to 1,630 yen a month. Neither one starts until you apply. Being outside the employer system is not what makes it cheap. Filing is.

What changes when you graduate and get hired

A job puts you inside the employer system. Health insurance and employee pension start coming out of your pay, so the drop from gross to net is steeper than it was as a student.

The income moves further. As the salary article shows, the average monthly wage on an engineer or specialist in humanities visa is 313,200 yen against the student ceiling of 137,312 yen, a gap of about 2.11 million yen a year. More is deducted, and much more is left.

The employee pension also matters on the way out. Part of what you paid can be claimed as a lump-sum withdrawal payment.

When to stop: three checks today

1. Look at your payslip. Health insurance and employee pension should not be there. Their absence is normal
2. If they are there, check whether you are working 30 hours a week or 15 days a month. On a student visa that already breaks the 28-hour cap
3. Check that you have filed for the National Health Insurance reduction and the student pension exemption

If the first is clean and the third is done, you are finished with this. Read it again when you take leave, and when you graduate into a job.

FAQ

Q. Are international students exempt from social insurance?
Not exempt. Students sit outside the employer system by design. You join National Health Insurance and the National Pension instead and pay them yourself. The thing closest to an exemption is the student pension exemption, which defers National Pension contributions while you study.

Q. If I earn more than 1.06 million yen, do I join?
Not as a student. The 88,000 yen a month figure is one of three conditions for short-hours workers, and not being a student is another of the three. While you are enrolled this door stays shut. The company-size condition widens in October 2027; the student rule does not change.

Q. Can a student ever end up inside the system?
Yes. The Japan Pension Service states that a student who meets the three-quarters test becomes an ordinary insured person. Where a regular employee works 40 hours a week and 20 days a month, that is 30 hours and 15 days. A student visa capped at 28 hours does not get there.

Q. Do Japanese language school students count as students?
Yes. The list covers miscellaneous schools with a course of one year or more, which most language schools are. The agency says the specific schools are the same as those on the student pension exemption list.

Q. What happens if I take a leave of absence?
You are treated as a non-student. At a company with 51 or more employees, working 20 hours a week with scheduled pay of 88,000 yen a month or more puts you into health insurance and employee pension. Your take-home changes, so tell your employer when you file the leave.

Q. What about employment insurance?
Separate system. Daytime students are generally not covered by employment insurance either. This article is about health insurance and employee pension.

Summary

• Social insurance here means employer health insurance and employee pension, not National Health Insurance or the National Pension
• There are two doors into it, and student part-time workers pass through neither
• The short-hours rule (20 hours, 88,000 yen a month) lists “not being a student” as a condition
• The other door is 30 hours a week and 15 days a month; a student visa caps you at 28 hours
• Exceptions: staying with the same employer after graduation, leave of absence, evening course, correspondence course
• Japanese language school students are included, as miscellaneous schools with a course of a year or more
• Nothing is deducted, but you pay the city office instead. The reduction and the exemption bring that to 1,630 yen a month
• A job starts the deductions and raises the income far more

Sources: Japan Pension Service, part-timers and the duty to join social insurance / same, students and the three-quarters test / same, what “student” means in the short-hours rule / same, expansion of coverage to short-hours workers