Japan Health Insurance Premium

Estimate Japan health insurance premium, care insurance, child support grants, and employer contributions using current Japan Health Insurance rates.

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Calculation basis and official references

Reviewed on:

Formula basis

Apply prefecture-specific health insurance rates to standard monthly remuneration and bonuses; include long-term care premium for ages 40–64, then split employer/employee shares.

Calculation method

This estimate uses Japan’s Kenkô Hoken Association prefectural rates to compute a rough employee and employer contribution from remuneration and age assumptions.

Exclusions and checks required

  • Rates differ by prefecture, age group, payroll class, bonus cap, and membership month.
  • Other insurers (union plans, national health insurance, continued coverage) follow separate rules.
  • When a rate change occurs between periods, confirm the exact effective month table.

Example input:：Employee with 300,000 JPY monthly remuneration in Tokyo

prefecture
Tokyo
standardMonthlyRemunerationYen
300000
standardBonusYen
0
age
35
effectiveMonth
2026-04

Displayed values are estimates and may differ from payroll output that uses exact grade rules and company-specific rounding.

Official references

FAQ

Who is this calculator for?

Estimate Japan health insurance premium, care insurance, child support grants, and employer contributions using current Japan Health Insurance rates.

What values should I enter?

Applies to: Japan Social insurance premiums

How should I interpret this estimate?

This estimate uses Japan’s Kenkô Hoken Association prefectural rates to compute a rough employee and employer contribution from remuneration and age assumptions.

How to use

  1. Enter your input values and press Calculate.
  2. Review the result and compare it with expected context.

Official references