Health, care and pension use your standard monthly remuneration (標準報酬月額) grade, not a simple percentage of salary.
Employee-share rates (Kyokai Kenpo Tokyo, FY2026): health 4.925%, childcare support 0.115%, care (40–64) 0.81%, pension 9.15%. Employment insurance: 0.5% of gross (general business).
Income tax uses the 2026 withholding computer-calculation method (甲欄 — dependents form submitted), rounded to the nearest ¥10. Your company may use the tax table instead, so a small difference (tens of yen) is normal.
Not included: bonuses, non-taxable commuting allowance, company-specific deductions (rent, meals), and year-end adjustment.
Resident tax is not included. It is set by your city from last year's income, and usually starts around June of your second year in Japan.
This is an estimate, not advice.
この計算は概算です(2026年度・協会けんぽ東京都・一般の事業・扶養控除等申告書提出済みの前提)。実際の金額は、会社の計算・地域・保険の種類・手当によって変わります。正確な金額は給与明細と会社にてご確認ください。