Smart Ways to Reduce Your Taxes in Japan

1. Introduction: The Reality of “Glass Wallets” in Japan

Living in Japan, you soon realize that taxes and social insurance can be a significant burden. This is especially true for salaried employees, often referred to as having “glass wallets” because every yen of income is transparently taxed at the source.

Before your salary even hits your bank account, several deductions are made:

Welfare Pension (Kosei Nenkin): Approx. 18.3% (split 50/50 with your employer).
Health Insurance: Approx. 10% (split 50/50 with your employer).
Employment Insurance & Taxes: Including Income Tax and Inhabitant Tax.

While these contributions fund Japan’s excellent social security system, the total bite out of your paycheck is substantial. However, there are legitimate, government-approved ways to lower your taxable income.

2. The 3 Steps to Tax Optimization in Japan

Step 1: Reducing Taxable Income (Deductions)

The first goal is to lower your “taxable income” base. By using these deductions, you report a smaller income to the tax office, which lowers both your Income Tax and Inhabitant Tax.

iDeCo (Individual Defined Contribution Pension): All contributions are 100% tax-deductible. Depending on your employment type, you can contribute between 12,000 JPY to 68,000 JPY per month.
- Official iDeCo Guide & Limits (English)
Small Enterprise Mutual Aid (Kyosai): For those with a side business or entrepreneurs, you can deduct up to 840,000 JPY annually from your income.
- SMRJ Official Website (Japanese)
Dependent Deduction: If you support family members overseas, you can claim them as dependents. A key requirement for dependents aged 30-69 is a remittance of 380,000 JPY or more per person annually.
- NTA Guide on Overseas Dependents (English)

Step 2: Direct Tax Credits and “Smart Spending”

This step focuses on reducing the actual tax amount you owe or converting your tax payments into tangible benefits.

Furusato Nozei (Hometown Tax Donation): * The Concept: Think of it as pre-paying your taxes to receive gifts. By “donating” to a local municipality, the amount (minus a 2,000 JPY fee) is deducted from your taxes, and you receive local goods in return.
- The Limit: Your donation limit depends on your income. Check your limit before donating!
- Furusato Nozei Limit Simulator (English Support) | Official Simulation (Japanese)
- Pro-tip: Salaried workers can use the “One-stop Special System” to claim this without filing a tax return.
Home Loan Tax Credit (Jutaku Loan Koujo): If you own a home, 0.7% of your year-end mortgage balance is deducted directly from your owed taxes for up to 13 years (for new homes). This can result in hundreds of thousands of yen in savings annually.
- MLIT Housing Tax Reform (Japanese)
The New NISA: This account protects your investment gains from the standard 20.315% tax.
- FSA New NISA Overview (English)

3. Strategies for Side Hustlers and Business Owners

For those who move beyond being a standard employee—such as freelancers or business owners—more advanced strategies become available.

Blue Tax Return (Aoiro Shinkoku): By maintaining proper bookkeeping, you can claim a special deduction of up to 650,000 JPY.
Company Housing (Shataku): Instead of paying rent from your post-tax salary, a business owner can have the company rent the property (Shataku). By treating a large portion of the rent as a business expense, you drastically reduce your personal taxable income.

Conclusion

Taxation in Japan is complex, but the system provides various “exit ramps.” Whether you are a corporate employee or a business owner, utilizing these three steps is the best way to protect your hard-earned money.