Japan Social Insurance Guide 2026 — 社会保険

Overview — The Four Social Insurance Programs

Japan's social insurance system (社会保険, shakai hoken) consists of four mandatory programs that cover employees in most companies:

👉 Pension Insurance (年金保険): Comprises the Employees' Pension Insurance (厚生年金, Kosei Nenkin) and National Pension (国民年金, Kokumin Nenkin). Total contribution rate: 18.3% of standard monthly income, split 50/50 between employer and employee.

👉 Health Insurance (健康保険): Covers medical, dental, and pharmacy costs. Premium rates vary by prefecture and insurer, typically 10–13% of standard monthly income, split 50/50. Includes the Healthcare Insurance for the Aged (後期高齢者医療制度) surcharge.

👉 Employment Insurance (雇用保険, Koyō Hoken): Covers unemployment benefits, childcare leave, and career development. The total rate is approximately 1.0% (varies slightly by industry), split between employer and employee.

👉 Workers' Accident Compensation (労災保険, Rōsai Hoken): Covers work-related injuries, illnesses, and commuting accidents. The premium rate varies by industry (0.25%–8.8%) and is paid 100% by the employer.

Pension Insurance — 18.3% (50/50 Split)

Japan's pension system has two tiers for employees:

👉 National Pension (国民年金): The basic, flat-rate pension for all residents aged 20–60. The monthly premium is JPY 16,590 (2026) for those not covered by Employees' Pension. Employees covered by Kosei Nenkin pay this as part of their combined contribution — no separate payment is needed.

👉 Employees' Pension Insurance (厚生年金): An income-proportional pension for employees of companies with 5+ employees (or fewer in certain industries). The contribution is 18.3% of standard monthly income (標準報酬月額), split 50/50. The standard monthly income is calculated from actual salary and bonus, grouped into a standardized grade table (等級表) ranging from approximately JPY 88,000 to JPY 650,000 (cap for pension).

👉 Contribution Cap: For Kosei Nenkin, the standard monthly income is capped at approximately JPY 650,000 (2026). Income above this cap does not attract additional pension contributions (but does not increase benefits either). Bonuses are capped at JPY 1.5 million per payment.

👉 Calculation Example: Employee with standard monthly income of JPY 400,000: total contribution = JPY 400,000 × 18.3% = JPY 73,200/month. Employee pays JPY 36,600, employer pays JPY 36,600. The employee's net salary deduction is JPY 36,600.

👉 Enrollment: Companies with 5+ regular employees (or 1+ in certain industries like manufacturing, transportation) must enroll in Kosei Nenkin. Part-time workers working at least 20 hours/week with monthly income of JPY 88,000+ are also covered since 2022 expansion.

Health Insurance — ~10–13% (50/50 Split, Varies by Prefecture)

Japan's health insurance is administered by two main types of insurers:

👉 Association-Managed Health Insurance (協会けんぽ): For employees of small to medium-sized companies. Managed by the Japan Health Insurance Association (全国健康保険協会). Premium rates vary by prefecture. For 2026, rates range from approximately 9.5% to 11.5% of standard monthly income, split 50/50.

👉 Society-Managed Health Insurance (組合健保): Large companies (typically 700+ employees) can establish their own health insurance society. Premium rates are set by each society and are generally lower than association rates (typically 8–11%). Some societies also offer additional benefits.

👉 Breakdown of Premium: The health insurance premium includes: basic medical coverage (療養給付費), nursing care insurance (介護保険 — for those aged 40–64, additional ~1.8% of standard income), and the Healthcare Insurance for the Aged (後期高齢者医療制度) support contribution (~1.5–2.0% calculated into the rate).

👉 Nursing Care Insurance (介護保険): An additional premium for employees aged 40–64. The rate is approximately 1.8% of standard monthly income, split 50/50. This covers long-term care services (elderly care, home help, nursing homes).

👉 Example (Tokyo, 2026): Standard monthly income JPY 400,000, Tokyo rate ~10.6% (including nursing care for 40+). Total = JPY 42,400. Employee pays JPY 21,200, employer pays JPY 21,200.

Employment Insurance — 雇用保険 (~1%)

Employment insurance provides unemployment benefits, childcare leave allowances, and training support:

👉 Total Rate: Approximately 1.0% of total wages (including bonuses), split 60/40 between employer and employee (rates vary slightly by industry). For 2026: employee portion ~0.4%, employer portion ~0.6%.

👉 Coverage: All employees working 20+ hours per week and employed for 31+ days are eligible. Part-time workers meeting these thresholds are also covered. The insurance covers: unemployment benefits (基本手当), childcare leave allowance (育児休業給付), and education/training support.

👉 Unemployment Benefits: Paid based on age, length of employment, and salary. Daily benefit amount = 50–80% of daily wage (capped). Duration: 90–360 days depending on age and contribution period. Special rules for dismissed employees (longer duration).

👉 Childcare Leave Allowance: Paid during parental leave (up to 1 year, extendable to 2). 67% of wage for first 180 days, then 50%. Funded through employment insurance.

Workers' Accident Compensation — 労災保険 (100% Employer)

Workers' accident insurance (労災保険, Rōsai Hoken) covers work-related injuries, illnesses, and commuting accidents:

👉 Employer-Funded: The full premium is paid by the employer — no deduction from employee salary. Rate varies by industry risk classification:

• Low-risk industries (office work, retail, finance): 0.25–0.5% of total wages
• Medium-risk (manufacturing, construction): 1.0–3.5%
• High-risk (mining, demolition, logging): Up to 8.8%

👉 Special Rules for Small Businesses: Very small businesses (with 5 or fewer employees in certain industries) may be eligible for a flat-rate lump-sum contribution system rather than a wage-proportional rate.

👉 Benefits: Medical treatment costs 100% covered (no co-pay), temporary disability benefit ~60% of daily wage, permanent disability pension, survivor benefits to dependents, and funeral expenses.

👉 Commuting Accidents: Injuries sustained during the commute to/from work are covered (通勤災害). This includes accidents on public transport, cycling, walking, and driving. The route must be a reasonable commuting route.

Standard Monthly Income (標準報酬月額) System

All social insurance premiums except employment insurance are calculated based on standard monthly income, not actual monthly salary:

👉 What It Is: Your actual monthly salary (including allowances but excluding overtime and bonuses) is mapped to a grade in the standard monthly income table (等級表). There are 32 grades for pension and 50 grades for health insurance, ranging from JPY 58,000 to JPY 1,390,000 (health insurance cap).

👉 How It Works: If your actual monthly salary is JPY 315,000, you are placed in the grade JPY 320,000 (pension) or a specific health insurance grade. Your premium is calculated on the grade value, not actual salary. This means small salary changes within a grade band do not affect premiums.

👉 Annual Adjustment (定時決定): Your standard monthly income is reassessed once per year in April–June, based on the previous 3 months' salary. The new grade takes effect from September and applies until the following August.

👉 Bonus Adjustment (随時改定): If your salary changes significantly (by at least 2 grades, typically ~±15%), you can request a mid-year reassessment. This applies to promotions, demotions, or significant salary changes.

👉 Bonuses: Bonuses are assessed separately. Each bonus payment is divided by JPY 1.5 million (if above this cap) to calculate additional pension/health premiums. Employment insurance is calculated on actual bonus amount.

Employer Obligations — Summary

Total employer social insurance costs for a typical employee (non-construction, Tokyo):

• Kosei Nenkin (Pension): 9.15% of standard monthly income (half of 18.3%)
• Health Insurance (Tokyo): ~5.3% of standard monthly income (half of ~10.6%)
• Nursing Care (if 40+): ~0.9% of standard monthly income (half of ~1.8%)
• Employment Insurance: ~0.6% of total wages
• Workers' Comp: ~0.25–3.0% of total wages (industry-dependent)
• Total Employer Burden: Approximately 16–19% of salary, on top of gross salary

For an employee earning JPY 400,000/month standard income with a JPY 1,000,000 annual bonus, the employer's monthly social insurance cost is approximately JPY 60,000–75,000 in addition to the gross salary.

Social Insurance for Foreign Workers

Foreign employees in Japan are generally subject to the same social insurance rules as Japanese employees:

👉 Mandatory Enrollment: Foreign employees working in Japan are enrolled in the same social insurance programs. There is no exemption based on nationality. The 183-day rule and international agreements may affect pension contributions.

👉 Totalization Agreements: Japan has bilateral social security agreements with approximately 20+ countries (including the US, UK, Germany, France, Australia, South Korea, and others). Under these agreements, employees can avoid double social security contributions — if covered by the home country's system, they may be exempt from Japanese pension insurance (Kosei Nenkin). An A1-type certificate (Certificate of Coverage) is required.

👉 Lump-Sum Withdrawal (脱退一時金): Foreign employees who leave Japan and are not eligible for a Japanese pension can claim a lump-sum refund of their Kosei Nenkin contributions (up to a maximum of 36 months' contributions). The refund is approximately 80% of contributions after withholding tax (20.42% tax on the refund amount). You must apply within 2 years of leaving Japan.

👉 Full Pension Eligibility: Foreigners who have contributed to the Japanese pension system for at least 10 years (reduced from 25 years in 2017) are eligible for a Japanese pension from age 65, even if living abroad.

FAQ

What is the total social insurance deduction from my salary in Japan?

For a typical employee in Tokyo, total deductions are approximately 14–16% of standard monthly income: ~9.15% for pension, ~5.3% for health insurance (including nursing care if 40+), and ~0.4% for employment insurance. The employer pays an equal or greater amount on top of gross salary.

What is the standard monthly income (標準報酬月額)?

It is your salary mapped to a standardized grade table used to calculate social insurance premiums. Your actual salary is grouped into one of 32–50 grades. Premiums are based on the grade value, not your exact salary. It is reassessed annually.

Are bonuses subject to social insurance?

Yes. Bonuses are subject to pension and health insurance (capped at JPY 1.5 million per bonus payment) and employment insurance (uncapped). The pension/health premium on bonuses is calculated at the same combined rate (18.3% + health rate) on the bonus amount up to the cap.

Can foreign employees opt out of Japanese social insurance?

Generally no — enrollment is mandatory for all employees working in Japan. However, if your home country has a totalization agreement with Japan and you have a Certificate of Coverage (COC), you may be exempt from Kosei Nenkin. The other components (health, employment, workers' comp) generally still apply.

What happens to my pension contributions if I leave Japan?

You can claim a lump-sum withdrawal (脱退一時金) of up to 36 months of Kosei Nenkin contributions within 2 years of leaving. 20.42% tax is withheld. If you contributed for 10+ years, you may qualify for a Japanese pension from age 65, even living abroad.

What is the difference between Kosei Nenkin and Kokumin Nenkin?

Kosei Nenkin (Employees' Pension) covers employees enrolled through their employer, with income-proportional benefits. Kokumin Nenkin (National Pension) is the basic flat-rate pension covering all residents, including self-employed, students, and non-working spouses. Employees covered by Kosei Nenkin also pay Kokumin Nenkin as part of their combined contribution.

How does nursing care insurance work?

Employees aged 40–64 pay an additional ~1.8% of standard monthly income (50/50 split) for nursing care insurance (介護保険). This covers long-term care services: home care, day services, nursing homes, and assistive equipment. Those 65+ pay separately from their pension.

Is workers' compensation included in the employee's share?

No. Workers' Accident Compensation (労災保険) is paid 100% by the employer. The rate varies by industry risk classification (0.25%–8.8% of total wages). There is no employee deduction for this insurance.