Furusato Tax Limit Calculator
Estimate your donation limit from income and family
年収・家族構成を入力
詳細オプション（社会保険料・住宅ローン控除・医療費控除）
計算結果
※ 計算結果は参考値です。正確性を保証するものではなく、結果に基づく損害について当サイトは一切の責任を負いません。
About Furusato Tax Limit Calculator
The Furusato Tax Limit Calculator estimates your maximum tax-deductible donation amount for Japan's Furusato Nozei (hometown tax) system. Based on Japanese income tax law, it computes salary income deduction, basic deduction (480,000 yen), spouse deduction (380,000 yen), dependent deductions (varying by age of dependents), and disabled person deductions to determine your taxable income and applicable income tax rate.
It derives the optimal donation limit using 20% of the resident tax income-based amount, factoring in the income tax rate and reconstruction special tax (2.1%). Social insurance defaults to approximately 15% of income but can be manually overridden with your actual amount from tax withholding slips. Housing loan credits and medical expense deductions can be entered for greater accuracy.
All calculations run entirely in your browser — no income data is ever sent to a server. Please note that this tool provides estimated values only; actual limits may vary by individual circumstances and municipality. We recommend consulting a tax advisor or local government office before filing your tax return.
How to use Furusato Tax Limit Calculator
- Enter your annual income (gross salary). You can also use preset buttons for common income levels
- Select whether you have a spouse deduction, and enter the number of dependents by age group if applicable
- If you, your spouse, or dependents are disabled, enter the number of disabled person deductions
- For more accurate results, enter your social insurance premiums, housing loan credit, or medical expense deductions if known in the advanced options
- Click the calculate button to see your estimated donation limit and effective deduction after the 2,000 yen self-payment
Benefits of Furusato Tax Limit Calculator
- Quickly estimate your donation limit to streamline furusato nozei planning
- Supports spouse deduction, dependent deductions, disabled person deductions, housing loan credits, and medical expense deductions for comprehensive accuracy
- Calculation details such as salary deduction and income tax rate are displayed, making it useful for understanding Japanese tax mechanics
- Income data is processed entirely in the browser and never sent externally
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