Health Insurance & Pension Enrollment in Japan: Process & Deadlines

Health insurance and pension enrollment in Japan must be completed within five days of each employee's start date—including the representative director at incorporation. The employer files a New Applicable Establishment Report and individual Qualification Acquisition Notifications with the Japan Pension Service, which administers both health insurance (健康保険, kenko hoken) and employees' pension (厚生年金, kousei nenkin) as a single enrollment process. Contributions are calculated based on Standard Monthly Remuneration (標準報酬月額), a grade-based bracket system that maps actual salary to standardized amounts. The combined employer share for health insurance and pension alone exceeds 14% of the employee's Standard Monthly Remuneration, making accurate enrollment and grade assignment critical for payroll accuracy from day one.

Initial Company Registration (New Applicable Establishment Report)

Every incorporated company in Japan must register as a social insurance applicable establishment within five days of incorporation. The New Applicable Establishment Report (新規適用届, shinki tekiyou todoke) is a one-time filing submitted to the Japan Pension Service district office that covers the company's jurisdiction.

Required documents for the establishment report include:

• New Applicable Establishment Report form—available from the Japan Pension Service website or local office
• Copy of the company registry (登記簿謄本)—must be issued within 90 days, showing the registered address and representative director
• Written confirmation of the business location—a lease agreement or property ownership document for the registered office

The Japan Pension Service processes the establishment report within approximately two weeks. Upon approval, the company receives an Applicable Establishment Notification (適用通知書) containing the company's social insurance establishment number (事業所番号), which is used on all subsequent enrollment filings. For foreign companies setting up their first Japanese entity, this registration is one of the earliest post-incorporation filing requirements alongside tax office notifications.

Employee Enrollment: Qualification Acquisition Notification

Each new employee must be individually enrolled through a Qualification Acquisition Notification (資格取得届) submitted to the Japan Pension Service within five days of their start date. This single form enrolls the employee in both health insurance and employees' pension simultaneously.

The notification requires the following information:

• Employee's name, date of birth, gender, and My Number (individual number)
• Employment start date (this becomes the qualification acquisition date)
• Estimated monthly compensation (used to determine the initial Standard Monthly Remuneration grade)
• Whether the employee has dependents to be enrolled in health insurance
• Previous pension number (基礎年金番号) if the employee was previously enrolled in Japan's pension system

After processing, the Japan Pension Service issues a health insurance card (健康保険証) and confirms the employee's pension number. The health insurance card typically arrives within two to three weeks. In urgent cases where medical care is needed before the card arrives, the employer can request an expedited certificate from the Japan Pension Service.

The representative director (代表取締役 for KK, 代表社員 for GK) must be enrolled using the same process at the time of company registration. Even if no other employees exist, the director is treated as an insured person under both health insurance and pension. As explained in the social insurance overview, this obligation applies to every incorporated company from day one.

Standard Monthly Remuneration: How Contributions Are Calculated

Health insurance and pension contributions are determined by the employee's Standard Monthly Remuneration (SMR), a standardized salary grade that maps actual compensation to a fixed bracket amount. The SMR system simplifies premium calculation by eliminating the need to compute exact percentages on variable monthly amounts.

SMR Grade	Monthly Salary Range	Standard Amount	Health Ins. (Employer)	Pension (Employer)	Total Employer Share
Grade 10	¥195,000–¥210,000	¥200,000	¥9,980	¥18,300	¥28,280
Grade 17	¥290,000–¥310,000	¥300,000	¥14,970	¥27,450	¥42,420
Grade 22	¥355,000–¥375,000	¥360,000	¥17,964	¥32,940	¥50,904
Grade 25	¥395,000–¥425,000	¥410,000	¥20,459	¥37,515	¥57,974
Grade 30	¥545,000–¥575,000	¥560,000	¥27,944	¥51,240	¥79,184
Grade 35	¥730,000–¥770,000	¥750,000	¥37,425	¥59,475	¥96,900
Grade 40	¥985,000–¥1,035,000	¥1,010,000	¥50,399	¥59,475	¥109,874
Grade 50 (Max)	¥1,355,000 and above	¥1,390,000	¥69,361	¥59,475	¥128,836

Health insurance employer rates shown above use the Tokyo Kyokai Kenpo rate of 9.98% (split 50/50, so employer pays 4.99%). The pension employer contribution is fixed at 9.15% nationally, with the pension SMR capped at Grade 32 (¥650,000). Above that pension cap, health insurance contributions continue increasing up to Grade 50 (¥1,390,000), but pension contributions remain flat at ¥59,475 per month per party. This cap means that for highly compensated employees, the pension contribution becomes a smaller percentage of total compensation.

Initial SMR Determination

When an employee first enrolls, the initial SMR is set based on the expected monthly compensation, including base salary, commuting allowance, housing allowance, and other fixed monthly payments. Variable components like overtime are estimated based on similar positions within the company. The initial grade applies until the next periodic update in September.

Annual Periodic Update (Teiji Kettei)

Every July, employers submit a Standard Remuneration Periodic Update Report (算定基礎届) to the Japan Pension Service, reporting each employee's average compensation for April, May, and June. The Japan Pension Service uses this three-month average to reassign each employee's SMR grade, which takes effect from September and remains fixed for 12 months (unless an interim revision is triggered).

An interim revision (随時改定, zuiji kaitei) is required when an employee's fixed compensation changes and the resulting three-month average differs from the current SMR by two or more grades. This ensures that significant salary changes (promotions, raises, role changes) are reflected in contributions without waiting for the annual update.

Dependent Coverage Under Health Insurance

Dependents are covered under health insurance at no additional premium cost to either the employer or employee. Japan's health insurance system uses a “family coverage” model where the insured person's premium covers all eligible dependents.

Eligible dependents include:

• Spouse—including common-law spouse, with annual income below ¥1.3 million (or below ¥1.8 million if the dependent is aged 60+ or disabled)
• Children—up to age 18 (or through college graduation in practice), meeting the income threshold
• Parents and grandparents—if living with the insured person and meeting the income threshold
• Siblings—if living with the insured person and meeting the income threshold

The dependent enrollment is submitted as part of the employee's Qualification Acquisition Notification or through a separate Dependent (Addition) Notification (被扶養者(異動)届). The ¥1.3 million annual income threshold includes employment income, pension income, and other recurring revenue. For foreign employees, dependents residing overseas can still be enrolled if they meet the income criteria and have a certificate of relationship (typically a translated family register or birth certificate from the home country). According to the Ministry of Health, Labour and Welfare, Japan's employer-based health insurance covers approximately 39 million insured persons and 30 million dependents.

Kyokai Kenpo vs. Health Insurance Societies

Employer-based health insurance in Japan is administered through two channels: Kyokai Kenpo (協会けんぽ, the Japan Health Insurance Association) and employer-established Health Insurance Societies (健康保険組合, kenko hoken kumiai).

Kyokai Kenpo is the default insurer for small and medium enterprises and covers approximately 24 million insured persons. Rates vary by prefecture—ranging from 9.33% (Niigata) to 10.36% (Saga) in fiscal year 2025—and are split evenly between employer and employee. Foreign companies establishing their first Japanese entity will automatically be enrolled with Kyokai Kenpo.

Health Insurance Societies are established by large companies or industry groups with 700 or more employees. Approximately 1,400 societies operate in Japan, covering roughly 15 million insured persons. Societies can set rates lower than Kyokai Kenpo (subject to a minimum) and may offer enhanced benefits such as additional wellness programs, higher reimbursement rates, or supplementary dental coverage. Companies considering forming or joining a Health Insurance Society should evaluate whether the long-term premium savings offset the administrative burden of managing the society.

Bonuses and Standard Bonus Amount

Health insurance and pension contributions also apply to bonuses through the Standard Bonus Amount (標準賞与額) system. Each bonus payment is rounded down to the nearest ¥1,000, and health insurance and pension rates are applied at the same percentages as monthly contributions.

Annual caps limit the total bonus contributions: health insurance has an annual cumulative cap of ¥5,730,000 per year, while pension has a per-bonus cap of ¥1,500,000. Bonuses exceeding these caps are not subject to additional contributions. For companies paying large performance bonuses, these caps can result in meaningful premium savings compared to distributing the same total compensation as monthly salary. According to the Japan Pension Service, the Standard Bonus Amount system ensures that employees who receive a significant portion of compensation as bonuses contribute proportionally to the system.

Common Enrollment Mistakes for Foreign Companies

Foreign companies entering Japan frequently encounter specific enrollment issues that can lead to penalties, retroactive premiums, or employee dissatisfaction.

• Delaying enrollment until “operations begin”—enrollment is required from the date of incorporation, not the date the company begins generating revenue. Even during the setup phase with only a director on payroll, the company must be registered and the director enrolled.
• Excluding part-time or contract workers—employees working three-quarters or more of regular hours must be enrolled. Companies with 51+ employees must also enroll part-time workers meeting the expanded eligibility criteria (20+ hours per week, ¥88,000+ monthly wages).
• Miscalculating initial SMR by excluding allowances—commuting allowances, housing allowances, and other regular payments must be included when determining the initial Standard Monthly Remuneration grade. Excluding these results in under-reporting that will be caught during audits.
• Missing the five-day enrollment deadline—late enrollment does not change the effective date. The Japan Pension Service will backdate coverage, and the employer must pay retroactive premiums for the entire period of non-enrollment, plus a 10% penalty surcharge.
• Failing to update SMR after salary changes—when fixed compensation changes by two or more grades, an interim revision must be filed. Failure to file results in incorrect contributions that must eventually be reconciled, creating cash flow disruptions for both the company and affected employees.

Accurate and timely enrollment protects the company from penalties and ensures employees receive their health insurance cards and pension coverage without delays. The employment insurance enrollment guide and workers' accident insurance guide cover the parallel registration requirements for Japan's labor insurance programs.

Health insurance and pension enrollment is the foundation of Japan's social insurance compliance framework. Getting it right from incorporation prevents costly retroactive assessments and demonstrates to Japanese authorities that the company takes local compliance seriously. AQ Partners manages the complete enrollment process for foreign companies—from establishment registration through individual employee enrollment, annual periodic updates, and ongoing SMR management. Contact us at hello@aqpartners.jp to discuss your health insurance and pension enrollment.