JP freelance tax estimator — income, resident, health & business tax
Annual tax & social-insurance estimator for Japanese sole proprietors. Covers income tax, resident tax, consumption tax, business tax, and furusato-nozei cap. Runs entirely in your browser.
How to use
Work through the steps top to bottom. Under Settings, review or tweak the tax / social-insurance parameters (defaults target the current tax year). Under Business, enter monthly sales and expenses (bulk-apply buttons available). Under Deductions, fill in social insurance / iDeCo / medical / furusato-nozei figures. The Result step shows the full computation flow for income tax, resident tax, consumption tax, business tax, plus the furusato-nozei cap and your take-home.
FAQ
- Are the figures I enter uploaded?
- No, calculations run entirely in the browser. The optional Local save toggle stores values in your device's localStorage — they still never leave your device.
- Is this an official tax calculation?
- It's a simplified simulation. The actual liability depends on edge cases and special measures, so confirm with a tax accountant or the official e-Tax / municipal calculator before filing.
- Do I need invoice (qualified-invoice) registration?
- You become a consumption-tax payer once sales exceed 10M JPY or you register voluntarily. Toggle Invoice registered to also estimate the simplified (kani-kazei) regime.
- Can I simulate prior tax years?
- Yes, but only by editing the parameters yourself. The defaults target the current tax year.
- Is the furusato-nozei cap trustworthy?
- It's an estimate. The real cap depends on the final income / deductions / resident tax — cross-check with the official municipal calculator.
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