Crypto Tax Basics in Japan: Miscellaneous Income and Filing Explained

"I made money on Bitcoin, but how is it taxed?" Taxes on crypto assets in Japan work very differently from stocks or FX, and the burden can be heavier than expected. The key point is that crypto profit is treated as "miscellaneous income" under aggregate taxation, so the rate rises as your total income grows. Let's cover the basics.

Crypto Profit Is Miscellaneous Income

For individuals, profit from crypto trading is generally classified as miscellaneous income, a catch-all category for income that fits no other type. While stock capital gains are "transfer income" taxed at a flat 20.315%, crypto is combined with your salary and other income and taxed at progressive rates (covered below).

Miscellaneous income has several disadvantages:

• Combined with other income, so higher earners pay higher rates.
• No offsetting against salary or business income: a crypto loss cannot be deducted from your salary to recover tax.
• No loss carryover: unlike stocks, losses cannot be carried to future years.

In short, gains are taxed heavily while losses get little relief. You can estimate your tax with the Crypto & FX Tax Simulator.

Aggregate Taxation and Progressive Rates

Crypto profit is added to your "taxable income" with salary and taxed at progressive income tax rates of 5%-45%, plus roughly 10% residence tax and a reconstruction surtax (2.1% of income tax). The income tax table is:

With residence tax included, high earners can lose roughly half (up to about 55%) of their profit to tax. For example, an employee with 5M yen of taxable salary income who makes 2M yen on crypto sees that profit fall in the 3.30M-6.95M band: 20% income tax plus 10% residence tax, so about 30% of the gain. Compared with the flat 20.315% on stocks, the burden clearly grows for higher earners.

From 2026, the income tax basic deduction also varies with total income: 1,040,000 yen if total income is 4.89M yen or less, but 670,000 yen above 4.89M and 620,000 yen above 6.55M (the residence tax basic deduction stays at 430,000 yen). Crypto profit counts toward total income, so taking profits that push you over 4.89M yen cuts the deduction by 370,000 yen and raises your tax by a step. The Crypto & FX Tax Simulator shows this extra tax too.

Four Moments When Gains Are Realized

A common stumbling block is knowing "when" tax applies. Even without converting to yen, a gain is realized and becomes taxable at these moments:

1. Selling for yen: the difference from your cost is the gain. The clearest case.
2. Swapping for another crypto: buying Ethereum with Bitcoin is treated as selling the Bitcoin, realizing its gain even without returning to yen.
3. Paying for goods or services with crypto: treated as selling the crypto at the time of payment.
4. Receiving mining, staking, or lending rewards: the market value at receipt is income.

The crypto-to-crypto swap case is easily overlooked. Assuming "no tax because I never cashed out to yen" is a serious risk.

Why Loss Calculation Is Hard

The main reason crypto filing is painful is the complexity of profit-and-loss calculation:

• Cost basis method: trading the same coin repeatedly requires a "total average" or "moving average" method for the per-unit cost, used consistently once chosen.
• Many transaction types: not just trades but swaps, payments, airdrops, and staking rewards are all taxable events.
• Aggregating multiple exchanges and wallets: trades across domestic and overseas exchanges, DeFi, and wallets must all be converted to yen.
• Price data: you must record the market value at the time of each swap or receipt.

For active traders, manual aggregation becomes impractical, so calculation tools or professionals are common. Start by knowing your annual profit; the Crypto & FX Tax Simulator gives a quick estimate to help plan your filing.

How It Differs from Stocks and FX

Even similar "investment profits" are taxed very differently by product. Here is a comparison of three common ones:

Note that even though FX is also "miscellaneous income," it uses separate taxation at a flat 20.315% and allows three-year loss carryover. Crypto, under aggregate taxation, sees rates rise with profit and allows no carryover. The same label hides very different treatment. You can estimate stock and transfer-income tax with the Capital Gains Tax Simulator.

Note that Japan's FY2026 tax reform plans, subject to amendments to the Financial Instruments and Exchange Act, to tax gains on certain crypto assets traded through registered crypto-asset businesses at a separate 20% like stocks (income tax 15% + residence tax 5%, plus surtax), with a 3-year loss carryforward. It starts in January of the year after the amended act takes effect, which was not yet fixed as of October 2026 (January 2028 is considered likely). Until then, crypto profit remains miscellaneous income under aggregate taxation as described here.

When You Need to File

Finally, a guide to whether you must file:

1. Employees with over 200,000 yen of non-salary income (including crypto) per year: filing required.
2. People without salary (e.g., dependents) whose income, such as crypto profit, exceeds their deductions (including the basic deduction) so that income tax arises: filing required. The income tax basic deduction is 1,040,000 yen for 2026 if total income is 4.89M yen or less, and 950,000 yen for 2025 if total income is 1.32M yen or less.
3. Sole proprietors who already file: include crypto profit regardless of amount.

Note that the "no filing under 200,000 yen" rule applies only to income tax; residence tax must still be declared even below 200,000 yen. The residence tax basic deduction remains 430,000 yen, so you may need to declare for residence tax even when no income tax is due. Forgetting to file when you have profit can lead to additional and delinquency taxes later. Start by checking your profit and estimated tax with the Crypto & FX Tax Simulator and prepare early.

This article reflects general information as of October 2026 and tax rules may change. For exact calculations and advice on your situation, always consult official sources such as the National Tax Agency or a qualified tax professional. This article does not recommend any specific investment.