Why is the 1.06M / 1.30M JPY threshold considered the most severe wall?

Crossing 1.06M JPY (at companies with 51+ employees) or 1.30M JPY (all companies) revokes spouse health insurance dependency, deducting ~15% (~160,000 JPY/year) in mandatory social security.

What annual salary overcomes the social security deduction dip?

To restore net take-home pay to a level higher than someone earning just under 1.30 million JPY, an employee typically needs to earn approximately 1.55 to 1.60 million JPY.

JapanUpdated for 2026Finance

Japan Part-Time Income Wall Calculator 2026 (1.03M / 1.06M / 1.30M Yen Barriers)

Simulate net take-home pay and diagnose the 'working-at-a-loss' phenomenon for part-time workers in Japan crossing the 1.03M JPY tax wall, 1.06M JPY social security threshold, and 1.30M JPY dependent loss barrier.

Salaries & Monthly Wages Payroll & Deductions Income Tax & Brackets

Calculated Result

Actual Net Annual Take-Home

¥1,206,769

Total Deductions Withheld

¥43,231

Calculator Inputs

Target Annual Part-Time Gross Income

Quick select:

Employer Company Size (Staff Count)

Actual Net Annual Take-Home

¥1,206,769

Total Deductions Withheld

¥43,231

Social Insurance Deducted

¥0

Social Security Threshold

¥1,300,000

Income Tax (Over 1.03M)

¥11,231

Resident Tax (Over 1M)

¥32,000

Net Pay vs Social Deductions

Net Take-Home Pay

¥1,206,769(100%)

Self Social Insurance

¥0(0%)

Based on 2026 statutory rules for short-time employees (businesses with 51+ employees, 20+ hrs/wk, 88k JPY/mo).

This calculator is a mathematical model for general financial estimation, planning, and educational guidance. Results depend on your inputs and standard formulas, and do not constitute binding financial, tax, or investment advice. Always consult a qualified professional before making financial decisions.

Official Statute: 所得税法 (扶養控除・配偶者特別控除) 及び健康保険法・厚生年金保険法 (短時間労働者に対する社会保険適用拡大基準)Last Verified: 2026-09-03

Calculation Methodology

Income tax triggers over 1.03M JPY; Social security coverage (~15% deduction) triggers over 1.06M or 1.30M JPY.

Frequently Asked Questions

Exceeding 1.03M JPY triggers personal income tax at 5% strictly on the excess amount above 1.03M JPY. It does not cause a drastic drop in take-home pay by itself.

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Japan Part-Time Income Wall Calculator 2026 (1.03M / 1.06M / 1.30M Yen Barriers)

Calculator Inputs

Net Pay vs Social Deductions

Calculation Methodology

Frequently Asked Questions

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