Shakai Hoken vs Kokuho: Comparing Japan's Health Insurance Systems
Japan has two main public health insurance systems. If you work for a company with 5 or more employees, you are generally enrolled in Employee Health Insurance (Shakai Hoken / 社会保険). If you are self-employed, a student, or between jobs, you typically enroll in National Health Insurance (Kokuho / 国民健康保険). Understanding which system applies to you helps avoid gaps in coverage.
| Feature | Shakai Hoken (Employee) | Kokuho (National) |
|---|---|---|
| Who Enrolls | Company employees | Self-employed, students, unemployed |
| Premium Payment | Split 50/50 with employer | Paid 100% by individual |
| Coverage Rate | 70% (same) | 70% (same) |
| Dependents | Covered at no extra cost | Each person pays separately |
| Includes Pension? | Yes (Kosei Nenkin bundled) | No (National Pension separate) |
| Maternity Benefits | Maternity allowance + leave pay | Lump-sum birth grant only |
Key Differences Explained
Premium Costs
Shakai Hoken premiums are deducted from your salary, and your employer pays half. Kokuho premiums are based on your previous year's income and household size — you pay the full amount yourself.
Dependent Coverage
One significant advantage of Shakai Hoken is that dependents (spouse, children) can be covered at no additional premium. Under Kokuho, each household member's premium is calculated individually.
Switching Between Systems
When you leave a job, your Shakai Hoken ends. You have 14 days to enroll in Kokuho at your city office, or you may optionally continue Shakai Hoken for up to 2 years (任意継続) by paying the full premium yourself.
Q: Can I choose which system to join?
Generally, no. If your employer offers Shakai Hoken, enrollment is mandatory. Kokuho is for those not eligible for employer insurance.
Q: Is the medical coverage identical?
Both cover 70% of costs at the point of care. However, Shakai Hoken includes additional benefits like sickness allowance (傷病手当金) and maternity leave pay that Kokuho does not provide.
※ This article is for informational purposes only. Please confirm details with your employer or local city office.
