国別 年収ランキング計算

How Japan salary percentile is computed

We use 5-point quantile data (P10/P25/P50/P75/P90) from MHLW's Basic Survey on Wage Structure (賃金構造基本統計調査), the most authoritative wage statistics in Japan. The same methodology as Korea: linear interpolation within 5-year age cohorts, adjacent group weighted averaging, and 1-year resolution adjustment. Annual bonus is assumed at 1.0 month of base salary (NTA national average).

Sources and reliability

All data is sourced from official Japanese government agencies: MHLW (Basic Survey on Wage Structure, wage distribution), NTA (源泉徴収税額表 monthly withholding table 2026, income tax), Japan Pension Service (Employee Pension premium table), Kyoukai Kenpo (Health and Long-term Care average Tokyo rates), and the Ministry of Internal Affairs (Resident Tax 10% standard). No proprietary adjustments — only official current data.

Frequently asked questions

How is the Japan salary percentile calculated?

Using cumulative position via linear interpolation across 5-point quantiles (P10/P25/P50/P75/P90) from MHLW's Basic Survey on Wage Structure (賃金構造基本統計調査), with adjacent 10-year group weighted averaging and 1-year resolution adjustments.

How are the deductions computed?

Employee Pension 9.15% (employee share), Health Insurance 4.95% (Tokyo average), Long-term Care 0.795% (age 40+), Employment Insurance 0.6%, Income Tax via NTA monthly withholding table (0 dependents), Resident Tax = 10% of taxable annual income applied monthly. Annual bonus assumed at 1.0 month base salary (NTA average).

Why use the Tokyo-average rate?

Health and long-term care rates vary by prefecture (Kyoukai Kenpo). The Tokyo average (~4.95%) closely tracks the national average and is used as the standard. Actual rates may differ by ±0.3% depending on residence.

How are exchange rates applied?

Conversions between the user's input currency (e.g. KRW for Korean UI) and Japanese data (万円) use nominal exchange rates. The 2026 average rate serves as the baseline.