Check every eligible deduction
iDeCo, life insurance, medical expenses, home loans and Furusato Nozei may reduce tax when their conditions are met. Check eligibility and limits, not only the amount paid.
Three ways to review your tax burden in Japan
To improve take-home pay, check every deduction available to you and organize all income, including side work. Compare this estimate with your withholding slip and deduction certificates.
Record side income after expenses
Tax is generally based on profit after necessary expenses, not gross side-business sales. Keep records and confirm the correct income category.
Know when a tax return is needed
Medical expense deductions and first-year home-loan credits usually require a tax return. Review the latest National Tax Agency guidance before filing.
Japan tax calculator FAQ
Will this result match my final tax bill?
No. This is a simplified estimate of social insurance, resident tax and deductions. Actual amounts vary by employer, municipality, insurance scheme and income type.
Which year of income determines resident tax?
Resident tax is generally calculated from the previous year’s income and charged in the following fiscal year. This page shows an annual estimate beside income tax for comparison.
When does side income require a tax return?
Some employees may not need an income-tax return below certain conditions, but a resident-tax filing may still be required. Confirm your specific situation with official guidance.
Does the calculator use the 2026 deductions?
Yes. The estimate reflects the 2026 basic-deduction increase and the ¥740,000 minimum employment-income deduction.