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Capital Gains Tax Calculator (Japan Stocks) Tool

Enter the cost, sale price and quantity of your stocks or investment funds to estimate the capital gain and the 20.315% separate self-assessment tax, along with your net proceeds. Add multiple holdings to calculate the tax after offsetting gains and losses.

Last updated: 2026/10/16 Finance Feedback & bug reports

Enter Your Holdings

Estimated Net Proceeds (after tax)
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Sale proceeds after deducting tax
Total Sale Proceeds
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Cost + Fees
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Capital Gain (after offset)
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Income Tax (15%)
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Reconstruction Surtax (0.315%)
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Resident Tax (5%)
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Total Tax (20.315%)
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A capital loss is not taxed. By filing a tax return you can offset it against other listed-stock gains and (separately-taxed) dividends in the same year, and carry forward any remaining loss for up to three years (loss carryover).

Tax-free in a NISA Account

Gains and dividends earned inside a NISA (tax-exempt investment) account are tax-free, so the tax shown here does not apply. Note that losses in a NISA account cannot be offset against gains in other accounts and cannot be carried forward.

Tokutei-koza (with withholding)

With a "specified account with withholding" (tokutei-koza), your broker automatically withholds and pays the 20.315% tax on each sale, so generally no tax return is required. Annual gain/loss offsetting and refunds are settled within the account. You can use this tool as a rough estimate of that withheld amount.

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Important Notes
  • Results are an approximate estimate only and do not guarantee the actual tax or net amount.
  • This is a simplified calculation assuming separate self-assessment taxation (total 20.315%) on gains from listed stocks and public stock investment funds. It does not reflect general (unlisted) shares, NISA, offsetting with dividends, or income/tax credits.
  • This tool is not tax or investment advice. Make final tax and investment decisions at your own responsibility and consult a tax professional, the tax office or a financial institution as needed.
  • Tax rates and rules are based on the system as of 2026 (Reiwa 8) and may change with future reforms.
  • All calculations run in your browser; your inputs are never sent to any server.

How to Use

1

Enter Cost & Sale Details

Enter the cost per share, sale price per share and quantity. Add trading fees if known for a more accurate result.

2

Add Multiple Holdings

If you sold several holdings, add rows to calculate the tax on the combined total after offsetting gains and losses.

3

Check Tax & Net Proceeds

The capital gain, income tax, resident tax, total tax and net proceeds update instantly with a full breakdown.

About the Capital Gains Tax Calculator

When you sell listed stocks or investment funds in Japan at a profit (capital gain), that gain is taxed under separate self-assessment taxation at a combined 20.315% (15% income tax + 0.315% special reconstruction surtax + 5% resident tax). This tool calculates the gain from your cost, sale price and quantity, and instantly estimates the tax and your final net proceeds in your browser. Add multiple holdings to automatically compute the tax after offsetting gains and losses.

Features

  • Real-time CalculationThe tax and net proceeds recalculate instantly as you change the cost, sale price or quantity.
  • Offset Multiple HoldingsEnter several holdings to automatically tax the combined total after offsetting gains and losses.
  • Full BreakdownSee the income tax, reconstruction surtax and resident tax breakdown, plus the gain and net proceeds.
  • Privacy ProtectedAll calculations run in your browser. Your inputs such as cost amounts are never sent to a server.

Use Cases

  • Estimate net proceeds after tax before selling stocks or funds
  • Simulate tax after offsetting gains and losses across multiple holdings
  • Check the approximate tax withheld in a specified account (with withholding)
  • Compare the tax burden between a NISA account and a taxable account
  • Plan the timing and quantity of taking profits

FAQ

What is the tax rate on capital gains from stocks and funds in Japan?
Gains from listed stocks and public stock investment funds are taxed under separate self-assessment at a combined 20.315%: 15% income tax, 0.315% reconstruction surtax (2.1% of the income tax) and 5% resident tax.
How is the capital gain calculated?
Capital gain = (sale price per share - cost per share) x quantity - trading fees. The cost should in principle include the purchase commission. With multiple holdings, this tool taxes the combined gain after offsetting each holding's profit and loss.
What happens if I have a loss?
A capital loss is not taxed. By filing a tax return, you can offset it against other listed-stock gains and separately-taxed dividends in the same year, and carry any remaining loss forward for up to three years (loss carryover).
Are gains in a NISA account also taxed?
No. Gains and dividends inside a NISA account are tax-free, so the tax shown here does not apply. However, losses in a NISA account cannot be offset against other accounts or carried forward.
Do I need to file a return with a specified account (with withholding)?
Generally no. Your broker withholds and pays the 20.315% on each sale and settles annual offsetting within the account. You only need to file if you want to offset across different brokers or carry forward a loss.
Is the result accurate? Is my data saved?
It is an approximate estimate and does not reflect income/tax credits or offsetting with dividends. Confirm exact figures with a tax professional, the tax office or a financial institution. All calculations run entirely in your browser and your inputs are never sent to or stored on any server.

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