Japan Social Insurance 2026: Health 5%, Pension 9.15% | MyKyoten
That first payslip in Japan hits different when you see 30% of your salary vanishing into mysterious deductions.
Last verified: 2026. This guide is based on Immigration Bureau regulations, Ministry of Health Labour and Welfare guidelines, and standard Japanese administrative practice. It is informational only and does not constitute legal advice. Consult a licensed immigration attorney or official government sources for case-specific guidance.
That first payslip in Japan hits different when you see 30% of your salary vanishing into mysterious deductions.
You are not being scammed. These are mandatory social insurance premiums that every employee pays, but the system deliberately keeps foreigners in the dark about how the calculations work.
Here is the part nobody tells you: your employer splits most of these costs with you, but you only see your half on the payslip. Understanding exactly what you pay and when prevents budget disasters and helps you catch calculation errors that cost hundreds of dollars monthly.
What exactly am I paying for in these social insurance deductions?
Three mandatory deductions eat your salary every month.
Health Insurance (健康保険) covers 70% of your medical costs. You pay roughly 5% of your gross salary, your employer matches it. The rate varies slightly by prefecture but hovers around 9.8% total split equally.
Employee Pension Insurance (厚生年金保険) funds your future pension payments. You pay 9.15% of gross salary, employer pays the same. This is non-negotiable if you work for a company with over 5 employees.
Employment Insurance (雇用保険) covers unemployment benefits if you lose your job. You pay 0.6% for most jobs, 0.8% for construction and similar industries. Your employer pays 0.95% to 1.25% depending on company size and industry.
The catch is these percentages apply to your standard monthly remuneration, not your actual monthly salary. This standardized amount changes only twice per year, creating timing confusion that trips up every foreigner.
How do I calculate my exact monthly deductions?
Start with your gross monthly salary including overtime and bonuses averaged over the past three months.
Look up your standard monthly remuneration grade in the official tables. A German software engineer earning ¥350,000 monthly falls into Grade 22, with a standard remuneration of ¥350,000.
Health Insurance: ¥350,000 × 4.95% = ¥17,325 Employee Pension: ¥350,000 × 9.15% = ¥32,025 Employment Insurance: ¥350,000 × 0.6% = ¥2,100
Total monthly deductions: ¥51,450
The math seems straightforward, but the standard remuneration system creates timing delays that mess with your budget planning.
Reality Check: Your first three months in Japan might have incorrect deductions because HR departments estimate your grade before having actual salary data. Expect retroactive adjustments in month four that can swing ¥10,000-20,000 either direction.
When do these deduction amounts actually change during the year?
Your social insurance premiums lock in for 12 months at a time, changing only during standard remuneration review periods.
April-June salary average determines your premiums from September through August of the following year. This creates a lag that catches everyone off guard.
Got a raise in July? Your deductions stay the same until the next September. Worked massive overtime in March? It will not affect your premiums because the review period had not started yet.
Bonus months trigger separate calculations. If your bonus exceeds ¥150,000, expect additional deductions using the same percentage rates but calculated separately from monthly premiums.
Warning Box: Companies can request mid-year adjustments if your salary changes by more than two grades, but most HR departments skip this paperwork unless the change is dramatic. A promotion from ¥300,000 to ¥400,000 monthly should trigger an immediate adjustment, but a bump from ¥300,000 to ¥320,000 will wait until September.
What do I actually pay at different salary levels?
¥200,000 monthly salary example: - Health Insurance: ¥9,900 - Employee Pension: ¥18,300 - Employment Insurance: ¥1,200 - Total deductions: ¥29,400 (14.7% of gross)
¥300,000 monthly salary example: - Health Insurance: ¥14,850 - Employee Pension: ¥27,450 - Employment Insurance: ¥1,800 - Total deductions: ¥44,100 (14.7% of gross)
¥500,000 monthly salary example: - Health Insurance: ¥24,750 - Employee Pension: ¥45,750 - Employment Insurance: ¥3,000 - Total deductions: ¥73,500 (14.7% of gross)
Notice the percentage stays consistent across salary levels. Higher earners pay more in absolute yen but the same percentage rate up to the pension premium ceiling at ¥635,000 monthly.
The psychological shock hits harder at lower salaries because ¥29,400 feels massive when your take-home is only ¥170,600.
How do I verify my payslip calculations are correct?
Grab your payslip and check three numbers: gross salary, standard monthly remuneration grade, and each deduction amount.
Most common error: HR uses the wrong standard remuneration table. Some companies accidentally use tables for different employee categories or outdated rate percentages from previous years.
Use the Payslip Decoder to verify each deduction matches current official rates for your salary bracket.
Red flags that signal calculation errors: - Deductions that change monthly without salary changes - Pension premiums exceeding ¥59,475 monthly (the legal maximum) - Employment insurance rates above 0.8% unless you work construction
Step-by-Step Checklist for Disputing Errors: 1. Document the error with exact yen amounts and dates 2. Print the official rate tables from the Japan Pension Service website 3. Schedule a meeting with HR, bring your evidence 4. Request retroactive correction for up to 2 years of overpayments 5. Follow up in writing if HR refuses to investigate
Companies legally must correct calculation errors, but you need to catch them first.
How do these deductions affect my taxes?
Good news: Social insurance premiums reduce your taxable income yen for yen.
If you paid ¥44,100 monthly in premiums (¥529,200 annually), your income tax calculation subtracts this full amount from your gross salary before applying tax rates.
The tax savings partially offset the premium pain. Someone in the 20% income tax bracket saves ¥105,840 annually in taxes, making the real cost of social insurance about 80% of the gross premium amount.
What if I leave Japan before retiring? You can claim a partial pension refund through the lump-sum withdrawal system, but you will pay a 20.42% tax on the refund amount. The Leaving Japan Calculator shows your exact refund after taxes.
What if my company miscalculates my standard remuneration grade? The Japan Pension Service will eventually audit and demand back payments with penalties. Better to catch grade errors early through payslip verification than face a surprise bill later.
A Filipino nurse on a Specified Skilled Worker visa discovered her employer used the wrong employment insurance rate for 18 months, overcharging her ¥15,000 total. HR corrected it immediately when she showed the official rate tables, but only because she did the research herself.
Your next step: Download your last three payslips and verify each social insurance deduction using current official rates to catch any calculation errors costing you money.
Do part-time workers pay the same social insurance rates? Only if you work over 20 hours weekly and earn above ¥88,000 monthly at companies with 51+ employees. Below these thresholds, you typically pay into National Health Insurance and National Pension instead, which have different calculation methods.
Can I opt out of social insurance if I have private insurance? No. Social insurance enrollment is mandatory for all eligible employees regardless of your private insurance coverage. You pay into both systems if you choose additional private coverage.
What happens if I change jobs mid-year? Your new employer continues deductions based on your current standard remuneration grade. The grade only resets during the April-June review period, so job changes do not immediately affect premium amounts.
The Payslip Decoder at https://mykyoten.com/tools/payslip-decoder breaks down every deduction on your Japanese payslip with current official rates, helping you spot calculation errors that could be costing you thousands of yen monthly. Upload your payslip and verify your social insurance premiums match what you should actually be paying.