🤝 Japan Severance Pay Tax Calculator

The Japan Severance Pay Tax Calculator estimates the income tax on your severance or retirement pay (taishokukin, 退職金). In Japan, severance pay receives preferential tax treatment through the retirement income deduction (taishoku shotoku kojo), which is designed to reward long-term employment.

The retirement income deduction is calculated based on years of service (kinzoku nenrei):

• Up to 20 years: 400,000 yen per year of service
• Years 21 and beyond: 700,000 yen per additional year

For example, an employee with 25 years of service gets: (20 x 400,000) + (5 x 700,000) = 11,500,000 yen deduction. If their severance pay is 15 million yen, only 3.5 million yen is taxable.

The taxable amount is then halved (a 50% reduction called "retirement income amount") before applying progressive tax brackets. This means the effective tax on severance is dramatically lower than on regular salary of the same amount.

For severance under 30 million yen with long service, many employees pay zero tax. The system incentivizes lifetime employment and makes retirement financially manageable.

The severance pay tax calculation follows a multi-step preferential formula:

Step 1: Retirement Income Deduction

• Years 1-20: 400,000 yen x years of service
• Years 21+: add 700,000 yen per additional year
• Disability add-on: +1 million yen (if applicable)

Step 2: Taxable Retirement Income

Taxable = Max(0, Severance Amount - Retirement Income Deduction)

Step 3: Retirement Income Amount (50% reduction)

Retirement Income Amount = Taxable x 0.5

Step 4: Apply Progressive Tax Brackets (5%-45%) + 2.1% surcharge

The 50% reduction in Step 3 is what makes severance pay taxation so favorable. A 10 million yen severance for a 30-year employee might have zero taxable income after deductions, while the same amount as regular salary would generate millions of yen in tax.

1. Enter your total severance pay amount (gross, in yen).
2. Enter your total years of service at the company.
3. Indicate if you have a disability (adds 1 million yen deduction).
4. Click Calculate to see your retirement income deduction and tax.
5. Review the taxable amount, tax, and net severance.

How is severance pay (taishokukin) taxed differently from regular salary?

Severance pay receives dramatically preferential tax treatment in Japan. First, a large retirement income deduction based on years of service reduces or eliminates the taxable amount. Second, the remaining taxable amount is halved (50% reduction) before applying tax brackets. For example, an employee with 30 years of service can receive up to 15 million yen completely tax-free, while the same amount as salary would generate over 3 million yen in income tax.

What is the retirement income deduction formula?

The deduction scales with years of service: 400,000 yen per year for the first 20 years, then 700,000 yen per additional year beyond 20. For example, 10 years = 4,000,000 yen deduction; 25 years = (20 x 400,000) + (5 x 700,000) = 11,500,000 yen. If you have a disability, an additional 1,000,000 yen is added to the deduction.

Should I file severance tax separately or combine with regular income?

Almost always file separately (bumpai). Filing severance separately from your regular annual income means the severance amount does not push you into a higher tax bracket for your salary income. Japan allows severance to be taxed in isolation using the preferential formula. Your employer or the tax office handles this when you submit the taishoku shotoku shinseisho (retirement income tax form).

What happens if I receive severance in multiple installments?

If severance is paid across multiple tax years, each installment is taxed separately based on your total years of service at the time. The retirement income deduction is applied proportionally. However, once you start receiving installments, you cannot retroactively change the schedule. Splitting payments across years can reduce tax by keeping each year's taxable amount in lower brackets.

Are there cases where severance pay is not taxed at all?

Yes, in several scenarios: (1) The severance amount is below the retirement income deduction threshold (common for employees with 20+ years receiving modest severance). (2) The retirement income amount (after deduction and 50% reduction) falls below the minimum taxable threshold. (3) Some special cases like early retirement incentives may qualify for additional exemptions. However, the vast majority of severance payments are at least partially tax-free for long-serving employees.

This tool is for informational purposes only and does not constitute financial advice. Consult a qualified financial professional for advice specific to your situation.

Choose separation filing (bunpai) carefully: You can split severance pay across multiple tax years (bumpai) by deferring part of the payment. This can lower your tax by keeping you in a lower bracket each year. However, once you choose separation filing, you cannot change it. Consult a zeirishi (tax accountant) before making this decision.

Severance pay is not subject to social insurance: Health insurance, pension, and employment insurance are NOT deducted from severance pay. The full gross amount is subject only to income tax (with the preferential treatment described above). This means severance is one of the most tax-efficient income types in Japan.

The 30-year threshold is powerful: With 30+ years of service, the retirement income deduction exceeds 15 million yen. Combined with the 50% reduction in taxable amount, many career employees pay no tax at all on severance. If you are planning early retirement, the tax savings can be substantial.

Filing within 5 years: Severance tax can be filed through your employer (if processed at separation) or as a separate final tax return (kakutei shinkoku) within 5 years. Filing separately means the severance does not push your regular income into a higher bracket — this is the default and most advantageous treatment.