Shakai Hoken in Japan for Foreigners: The Complete Employee Insurance Guide

If you work for a company in Japan, you're almost certainly enrolled in Shakai Hoken — the employer-based social insurance system that bundles health insurance, pension, unemployment, workers' compensation, and long-term care into a single package deducted from your paycheck every month.

It's a better deal than NHI in almost every measurable way. Your employer pays half your premiums. You get income replacement if illness or injury keeps you off work. Your spouse and children can be covered at zero additional cost. And because premiums are automatically deducted from salary, there's no risk of missed payments affecting your visa renewal under the 2027 rule.

This guide covers everything foreign employees need to know: who qualifies, how premiums are calculated, what benefits you receive, what happens when you quit or change jobs, and how social security agreements with 24 countries can prevent double contributions.

→ This article is part of the Health Insurance in Japan series. For the full system overview, see ① The Complete Guide.

What Shakai Hoken Actually Is: Five Insurances in One

Shakai Hoken isn't just health insurance — it's a bundle of five distinct public insurance programs that activate simultaneously when you start a job.

Health Insurance (健康保険): Covers medical expenses at 30% copay and provides cash benefits including the Injury & Sickness Allowance and Maternity Allowance. This is the primary focus of this guide.

Employees' Pension (厚生年金保険): Retirement, disability, and survivors' pensions. Stacks on top of the basic National Pension as a "second tier." Premiums split 50/50 with your employer.

Employment Insurance (雇用保険): Unemployment benefits, childcare leave allowance, and job training subsidies. Employee contribution is 0.55% of gross salary for general industries.

Workers' Compensation (労災保険): Full coverage for work-related and commuting injuries, illness, and death. 100% employer-funded — you pay nothing.

Long-Term Care Insurance (介護保険): Additional premium for employees aged 40–64 to fund the elder care system.

All five (four if you're under 40) activate on your first day of employment. Your company handles all the paperwork. You don't need to visit any government office.

Who Qualifies: Workplace Requirements and Eligibility

Applicable Workplaces

All incorporated businesses (株式会社, 合同会社, NPOs, etc.) are required to enroll employees in Shakai Hoken regardless of size. Sole proprietorships with 5+ regular employees are also generally covered, except in certain industries (agriculture, fisheries, some service sectors).

Standard Eligibility (The Three-Quarters Rule)

Full-time employees and part-timers working at least three-quarters of a full-time employee's scheduled hours and days — roughly 30+ hours per week and 15+ days per month — must be enrolled.

The October 2024 Expansion: Part-Timers at Companies with 51+ Employees

Since October 2024, part-time and temporary workers meeting all of the following conditions are now covered:

① Weekly working hours: 20 or more ② Monthly wages: ¥88,000 or more (roughly ¥1.06 million annually; excludes overtime, bonuses, and commuting allowance) ③ Expected employment: over 2 months ④ Not a daytime student (evening and correspondence students are covered) ⑤ Company has 51 or more employees (designated as a "Specified Applicable Workplace" / 特定適用事業所)

The employee threshold has been reduced progressively: 501+ in October 2016, 101+ in October 2022, and 51+ in October 2024.

Impact on foreign residents: Non-student foreigners working 20+ hours per week at chain restaurants, convenience stores, retail outlets, or other businesses with 51+ employees are now automatically covered by Shakai Hoken. Study visa holders are excluded as daytime students, but Working Holiday and Dependent visa holders who meet the criteria are included.

How Premiums Are Calculated: Standard Monthly Remuneration

Unlike NHI, which uses last year's income, Shakai Hoken premiums are based on your current earnings through a system called Standard Monthly Remuneration (標準報酬月額).

What Standard Monthly Remuneration Is

Your total monthly compensation — base salary, overtime, commuting allowance, housing allowance, and other regular payments — is mapped to a bracket on a standardized table. Health insurance uses 50 tiers ranging from ¥58,000 (Tier 1) to ¥1,390,000 (Tier 50). Employees' Pension uses 32 tiers from ¥88,000 to ¥650,000.

For example, if your monthly pay falls between ¥285,000 and ¥310,000, your Standard Monthly Remuneration is ¥300,000 (Health Insurance Tier 22).

When Your Tier Is Set

At enrollment: Based on your expected monthly compensation when you start the job. Annual reassessment (算定基礎届 / Santei Kisocho): Every year, the average of your April–June pay is recalculated and applied from September through the following August. Mid-year adjustment (随時改定 / Zuiji Kaitei): If a salary change shifts your tier by 2 or more levels, your Standard Monthly Remuneration is revised.

Premium Rates and the 50/50 Split

Health insurance rate: For Kyokai Kenpo (Japan Health Insurance Association), rates vary by prefecture. The FY2025 national average is approximately 10%. Tokyo is 9.80%, with the highest (Saga) around 10.48% and the lowest (Niigata) around 9.25%. Corporate health insurance unions (組合健保) set their own rates, often lower than Kyokai Kenpo.

Employees' Pension rate: A flat 18.3% nationwide (fixed since September 2017).

The split: Both health insurance and pension premiums are divided 50/50 between employer and employee.

Premium Examples by Monthly Salary (Tokyo, Kyokai Kenpo, FY2025, Under 40)

Employees aged 40–64 pay an additional Long-Term Care premium (nationwide rate: 1.60%, split to 0.80% employee share). Bonuses are also subject to the same rates (health insurance bonus cap: ¥5.73 million cumulative per fiscal year; pension bonus cap: ¥1.5 million per payment).

Shakai Hoken Benefits: Three Things NHI Can't Offer

1. Injury & Sickness Allowance (傷病手当金)

When illness or injury keeps you off work for four or more consecutive days, you receive two-thirds of your standard daily remuneration starting from the 4th day.

Duration: Up to 18 months cumulative for the same condition. The January 2022 reform changed this from calendar-based to cumulative counting — days you return to work don't count toward the 18-month limit. This was a major improvement for people dealing with recurring conditions.

Calculation: Average Standard Monthly Remuneration over the 12 months before benefits begin ÷ 30 = Standard Daily Remuneration. Benefit = Standard Daily Remuneration × 2/3.

Practical example: An employee earning ¥300,000/month who breaks a leg and can't work for 3 months would receive approximately ¥580,000 in benefits (87 eligible days × ¥6,667/day).

NHI provides nothing equivalent. If you're self-employed or freelancing on NHI and can't work due to illness, you have zero public income protection. This is one of the most significant gaps between the two systems.

2. Maternity Allowance (出産手当金)

For the period from 42 days before your due date through 56 days after birth (98 days pre-birth for multiple pregnancies), Shakai Hoken pays two-thirds of your standard daily remuneration. If delivery is later than expected, the extra days are covered too.

This is separate from the Lump-Sum Birth Allowance (出産育児一時金) of ¥500,000 per child, which both NHI and Shakai Hoken members receive. Only Shakai Hoken members get the Maternity Allowance — the income replacement component.

Example: An employee on ¥250,000/month with a standard delivery receives approximately ¥567,000 in Maternity Allowance plus the ¥500,000 lump sum, totaling about ¥1,067,000.

→ Complete guide to childbirth-related insurance in ⑨ Having a Baby in Japan

3. Dependent Coverage (被扶養者制度)

Shakai Hoken members can add family members as dependents at zero additional premium cost. Eligible dependents include your spouse (including common-law), children, grandchildren, siblings, parents, and grandparents (relatives within the third degree).

Income requirement: The dependent must earn less than ¥1.3 million annually (¥1.8 million if aged 60+ or disabled), and less than half the primary insured's income.

The NHI contrast: NHI has no dependent system. Every household member adds to the premium through per-capita levies. For a family of four, the difference between Shakai Hoken's free dependent coverage and NHI's per-person charges can easily exceed ¥100,000–200,000 per year.

Pension note: A spouse earning under ¥1.3 million also qualifies as a Category 3 Insured Person (第3号被保険者) under the National Pension, meaning they build pension entitlement at no cost. This system is under review as part of pension reform discussions.

Leaving a Job: NHI, Voluntary Continuation, or Dependent Status

When you leave a company, your Shakai Hoken coverage ends the day after your last working day. If you're not starting a new job immediately, you have three options.

Option 1: Enroll in NHI

Deadline: 14 days from the day after resignation. Bring your Certificate of Loss of Social Insurance Eligibility (社会保険資格喪失証明書), Residence Card, and My Number Card to your municipal office.

Best when: Your previous income was low, you're single with no dependents, or you qualify for involuntary job loss reduction (70% salary income reduction for premium calculation).

Option 2: Voluntary Continuation (任意継続)

Deadline: 20 days from the day after resignation. Apply to your health insurance provider (Kyokai Kenpo branch or corporate health insurance union). Requirement: 2+ months of continuous enrollment before leaving.

Premium: Full rate (no employer subsidy) applied to your Standard Monthly Remuneration at separation — but capped. For Kyokai Kenpo, the cap is ¥300,000 Standard Monthly Remuneration. This means high earners pay substantially less under Voluntary Continuation than they would under NHI.

Example: If your salary was ¥500,000/month, your in-service health premium was ~¥24,500 (your half). Under Voluntary Continuation with the ¥300,000 cap: ¥300,000 × 9.80% = ¥29,400 total — still significantly less than what NHI would charge on the equivalent income.

Best when: Your salary was high, you have dependent family members (who remain covered under Voluntary Continuation), or you're receiving Injury & Sickness Allowance that started before resignation.

Caution: Premium payments must reach the insurer by the 10th of each month. Missing a single payment results in automatic termination — no exceptions, no grace period.

Option 3: Join a Family Member's Shakai Hoken as a Dependent

If your spouse or parent is enrolled in Shakai Hoken and your income is under ¥1.3 million, you can be added as their dependent at zero cost. The family member's employer handles the paperwork (target: within 5 days of your resignation).

Best when: You qualify. Zero premium is unbeatable.

Decision Framework

Can you become someone's dependent? → Option 3 (cheapest) High salary + dependents of your own? → Option 2 (cap benefit + dependent retention) Low previous income + single? → Option 1 (NHI reductions apply) Involuntary termination? → Option 1 (70% salary income reduction for NHI)

Get estimates for both NHI (from your municipal office) and Voluntary Continuation (from your insurer or HR department) before your last day.

Job Changes: Avoiding Insurance Gaps

When changing jobs, the gap between your last day at the old company and your first day at the new one matters.

Same-month transition: If you leave and start within the same calendar month, there's generally no gap in coverage. However, the premium billing details depend on your exact resignation date.

Gap between jobs: Even a two-week gap between employers creates a period where you're technically uninsured unless you enroll in NHI. If you visit a hospital during this period without coverage, you pay 100%.

Foreign resident risk: After June 2027, unregistered gap periods could show up as non-enrollment in visa screening databases. Even for short gaps, formally enrolling in and withdrawing from NHI is strongly recommended.

Social Security Agreements: Preventing Double Contributions

Japan has agreements with 24 countries (as of December 2025) to prevent workers temporarily assigned to Japan from paying into both their home country's and Japan's social insurance systems.

How It Works

If your assignment to Japan is expected to last 5 years or less, you can remain in your home country's system by presenting a Certificate of Coverage (適用証明書) issued by your home country's pension authority to the Japanese pension office. This exempts you from Japanese social insurance enrollment.

Country Coverage

Pension + health insurance (with period totalization): Germany, United States, Belgium, France, Netherlands, Czech Republic, Switzerland, Hungary, Luxembourg, Finland, Sweden — 11 countries where the agreement covers both pension and health insurance.

Pension only (with totalization): Canada, Australia, Spain, Ireland, Brazil, India, Philippines, Slovakia, Austria (effective December 2025) — 9 countries where health insurance is not covered, meaning you must enroll in Japan's health insurance regardless.

Double-enrollment prevention only (no totalization): United Kingdom, South Korea, China, Italy (effective April 2024) — 4 countries.

Important Distinction for Foreign Workers

These agreements apply to temporary assignments from a foreign parent company. If you're directly hired by a Japanese company (not dispatched from overseas), you must enroll in Japanese Shakai Hoken regardless of whether an agreement exists with your country.

What to Do If Your Company Won't Enroll You

Under Japanese law, all eligible employees at applicable workplaces must be enrolled in Shakai Hoken. Nationality is irrelevant. Refusing to enroll a foreign employee is illegal.

Steps to take:

First, raise the issue with your company's HR department in writing. If the company continues to refuse, contact the jurisdictional Japan Pension Service office (年金事務所). They have the authority to investigate, instruct, and penalize non-compliant businesses. Companies that violate enrollment obligations face fines of up to ¥500,000 and potential imprisonment of up to 6 months for responsible individuals.

You can also consult your local Labor Standards Inspection Office (労働基準監督署) or a labor union that accepts individual membership (合同労組 / ユニオン), many of which offer multilingual support.

The Lump-Sum Withdrawal Payment: Getting Pension Money Back When Leaving Japan

Foreign nationals who leave Japan can claim a Lump-Sum Withdrawal Payment (脱退一時金) from the Employees' Pension system. Eligibility: 6+ months of enrollment and no qualification for an old-age pension. The claim must be filed within 2 years of leaving Japan.

The payment equals your average Standard Monthly Remuneration × a rate determined by your number of months enrolled, up to a maximum of 60 months (raised from 36 months in April 2021).

Critical consideration: If your home country has a social security agreement with Japan that includes period totalization, your Japanese enrollment period can count toward your home country's pension qualification. In that case, claiming the withdrawal payment may not be in your best interest — you'd be trading long-term pension benefits for a short-term payout. Evaluate carefully before filing.

→ Complete departure procedures in ⑧ Leaving Japan guide

Reading Your Pay Slip

Every month, your pay slip (給与明細) itemizes your social insurance deductions. Here's what to look for:

Health insurance (健康保険料): Standard Monthly Remuneration × health insurance rate ÷ 2. Long-term care (介護保険料): Ages 40–64 only. Standard Monthly Remuneration × 1.60% ÷ 2. Employees' Pension (厚生年金保険料): Standard Monthly Remuneration × 18.3% ÷ 2. Employment insurance (雇用保険料): Gross pay × 0.55% (general industries).

For an employee earning ¥300,000/month, the combined employee-side deduction is approximately ¥45,000.

Frequently Asked Questions

Q: My company says social insurance doesn't apply during the probation period. Is that true? A: No. Social insurance enrollment is mandatory from the first day of employment, including probation periods. This is a common misconception — and an illegal practice. Raise it with HR, and if unresolved, contact the Pension Service office.

Q: I have two part-time jobs. How does social insurance work? A: If you meet Shakai Hoken eligibility at both employers, you file a "Report of Employment at Two or More Workplaces" (二以上事業所勤務届) with the Pension Service and designate a primary employer. Premiums are calculated on your combined earnings and allocated proportionally between the two employers.

Q: Are premiums waived during childcare leave? A: Yes. During childcare leave (育児休業), both the employee's and employer's social insurance premiums are fully exempted upon application. Your coverage and pension accrual continue uninterrupted during the exemption period.

Q: My company went bankrupt. What do I do? A: Enroll in NHI immediately. As an involuntary separation, you qualify for the NHI premium reduction that cuts your salary income by 70% for calculation purposes. If the bankruptcy trustee doesn't issue a Certificate of Loss of Eligibility, obtain a Confirmation of Withdrawal from the Pension Service office.

Navigate the Full Series

This article is for general informational purposes and does not constitute legal, tax, or employment advice. Premium rates vary by health insurance provider and prefecture. Consult your company's HR department or the Japan Pension Service for calculations specific to your situation.

Content is current as of February 2026.

Shakai Hoken is one of the best employer-provided insurance systems in the world — but navigating it as a foreigner comes with unique challenges. Have you had issues with enrollment, understanding your pay slip deductions, or switching insurance after a job change? Share your experience — your story could help fellow foreign workers avoid the same pitfalls.