Japan Temporary Income Tax

Subtract business expenses and the 500,000 JPY special allowance from revenue, then include one-half in total income for a rough tax increase estimate.

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Calculation basis and official references

Reviewed on:

Formula basis

Temporary income = max(revenue − direct expense − JPY 500,000, 0); included income = temporary income ÷ 2. Incremental tax is the difference between progressive income tax before and after inclusion.

Calculation method

This calculator subtracts directly related expenses and Japan’s JPY 500,000 special allowance from temporary income, includes one-half in other taxable income, and estimates the incremental income tax.

Exclusions and checks required

  • It does not determine whether receipts are truly temporary income rather than business, employment, transfer, or another income category.
  • Resident tax, deductions, tax credits, and loss offsets are not reconstructed from the single other-taxable-income input.

Example input:：JPY 3 million receipt, JPY 500,000 direct cost, and JPY 4 million other taxable income

revenueYen
3000000
expenseYen
500000
otherTaxableIncomeYen
4000000

This assumes the receipt qualifies as temporary income and the entered expense was incurred directly to obtain it.

Official references

FAQ

Who is this calculator for? Japan Temporary Income Tax

Subtract business expenses and the 500,000 JPY special allowance from revenue, then include one-half in total income for a rough tax increase estimate.

What values should I enter?

Applies to: Japan Income Tax & Deductions / Temporary income = Revenue − Expenses − 500,000 / Amount added to total income = Temporary income ÷ 2

How should I interpret this estimate?

This calculator subtracts directly related expenses and Japan’s JPY 500,000 special allowance from temporary income, includes one-half in other taxable income, and estimates the incremental income tax.

How to use

  1. Enter your input values and press Calculate.
  2. Review the result and compare it with expected context.
  3. Temporary income = max(revenue − direct expense − JPY 500,000, 0); included income = temporary income ÷ 2. Incremental tax is the difference between progressive income tax before and after inclusion.

Official references