Reducing tax on crypto assets (cryptocurrency) in Japan starts with two principles: merely holding it is not taxed, and the gain becomes taxable as miscellaneous income in the year you sell, exchange or pay with it. Realising a profit without knowing when it becomes taxable can lead to an unexpectedly large income tax and resident tax bill the following year. Conversely, knowing the timing and the rules leaves room to smooth out the tax burden within the law.
Based only on what can be confirmed in the National Tax Agency's 'Tax Treatment of Crypto Assets, etc.: FAQ' (last revised December 2025 (Reiwa 7)), its Tax Answer pages, and the Ministry of Finance's Fiscal 2026 (Reiwa 8) Tax Reform Outline, this article sets out eight legal ways to reduce crypto tax under the law as it stood on 22 September 2026. Profit made on overseas exchanges (MEXC, BingX and others) is treated the same way for residents of Japan. Methods such as 'it won't be noticed because it's overseas' or 'there are loopholes' are not tax-saving strategies, and the article explains why at the end.
Crypto is tax-free while you just hold it: when tax applies
Under the Income Tax Act, profit from crypto-asset transactions is classified in principle as miscellaneous income (other miscellaneous income), taxed under aggregate (comprehensive) taxation together with salary and other income (NTA FAQ 2-2). Tax applies when you 'dispose of' crypto assets you hold — an unrealised gain does not become income unless you dispose of the asset. The table below organises which acts count as a disposal, based on the FAQ's individual questions.
| Act | Taxable? | Basis / how it is calculated |
|---|---|---|
| Sold for yen (cashed out) | Taxable | Income = sale price − (acquisition cost per unit × quantity sold) (FAQ 1-1) |
| Bought goods or services with crypto (including card payments) | Taxable | The value of the goods is treated as the disposal price; the difference from the cost of disposal is income (FAQ 1-2) |
| Crypto-to-crypto exchange (e.g. BTC → USDT) | Taxable | Calculated using the purchase price of the crypto asset acquired as the disposal price (FAQ 1-3) |
| Received through mining, staking or lending | Taxable | The market value at the time received is income (FAQ 1-7) |
| Continuing to hold (with an unrealised gain) | Not taxable | No income arises because there has been no disposal |
| Moving between accounts or wallets in your own name | Not taxable | Does not count as a sale, exchange or payment, so no income arises from the move itself |
| Receiving a new crypto asset from a fork/split | Not taxable on receipt | Acquisition cost is ¥0; income arises when it is sold or used (FAQ 1-6) |
※ 'Card payment' is understood to include charging crypto assets onto a prepaid card and paying with it, since it still uses crypto assets as consideration and is treated as a disposal in the same way. Check each card service's own terms for how its mechanism works.
Even if you exchange BTC that has risen in value on an overseas exchange for USDT (a stablecoin) and have 'not yet converted it to yen', that exchange counts as a disposal of the BTC and becomes income for that year. The same applies to exchanging it for the yen-denominated stablecoin JPYC. The belief that 'it's not taxable this year because I haven't converted it back to yen' is a typical pattern that leads to under-reporting the following year.
8 ways to reduce crypto tax legally
The following are ways to legally reduce or smooth out your tax burden, based on rules confirmed in National Tax Agency publications. None of them guarantees a lower tax bill, and it is not advisable to decide your trading purpose or funding plans purely for tax reasons. If the amounts involved are large, consult a tax accountant.
| Strategy | What it involves | Basis |
|---|---|---|
| 1. Spread profit-taking across more than one year | Aggregate taxation uses progressive rates (5%–45% plus 10% resident tax). For the same total profit, spreading it across multiple years rather than realising it all in one year can sometimes lower the applicable rate | Tax Answer No. 2260 |
| 2. Salaried employees: watch the ¥200,000 line | No income tax return is needed if total non-salary income for the year is ¥200,000 or under (a resident-tax declaration is still required) | Tax Answer No. 1900 |
| 3. Realise unrealised losses within the year to offset gains | Losses and gains can be offset within the same year's miscellaneous income. Because losses cannot be carried forward to the next year, complete the offset within the year | FAQ 2-11, No. 2250 |
| 4. Claim every necessary expense | Includes the cost of disposal and sale fees, plus the portion of internet/PC costs etc. that is directly necessary for the trades | FAQ 2-3 |
| 5. Choose your valuation method (total-average or moving-average) | The total-average method applies if no notification is filed. Depending on your trading pattern, the moving-average method may better reflect actual results | FAQ 2-5, 2-6, A1-20 |
| 6. Above ¥3,000,000 in income, keeping books may allow business-income treatment | If you keep the required books and records, the income is in principle classified as business income (profit-seeking intent etc. is judged case by case) | FAQ 2-2 |
| 7. Keep the start of separate taxation (20%, 3-year carryforward) in mind | The Fiscal 2026 (Reiwa 8) Tax Reform Outline sets out 20% separate self-assessment taxation and a 3-year loss carryforward, applying to disposals etc. from the effective date onward | Ministry of Finance, Tax Reform Outline |
| 8. File a return and keep records | Not filing or under-reporting is not a 'strategy' — it triggers additional and delinquency tax. Overseas exchange information also reaches the NTA through CARF | No. 2024, NTA CARF |
1. Spread profit-taking across more than one year
Under aggregate taxation, income tax has seven bands from 5% for taxable income of ¥1,950,000 or under up to 45% above ¥40,000,000 (Tax Answer No. 2260, current as of 1 April 2026 (Reiwa 8)), with the 10% resident-tax income levy added on top. For the same total profit, realising it in a single year can push you into a higher band, whereas splitting it across two years can keep each portion in a lower band. However, you cannot know what the market will do next year. If you postpone a sale purely for the tax rate and the price then falls, it defeats the purpose, so 'spreading it across years' should be treated as just one option to keep in mind within your funding plan.
2. Salaried employees: watch the ¥200,000 line
Someone who receives salary from a single employer and has had year-end tax adjustment done does not need to file an income tax return if the total of income other than salary and retirement income (including crypto profit) is ¥200,000 or under for the year (No. 1900). Resident tax has no such threshold, however — a declaration to the municipality is required even at ¥200,000 or under. Also, in a year when you file an income tax return anyway, for example for a medical expense deduction, profit of ¥200,000 or under must also be included. This is covered in more detail in 'How much crypto profit is taxed in Japan?'
How much crypto profit is taxed in Japan? The ¥200,000 rule and tax-rate table →
3. Realise unrealised losses within the year to offset gains
A loss in miscellaneous income cannot be deducted from other income such as salary (FAQ 2-11, Income Tax Act Article 69), but within the same year's miscellaneous-income calculation, a gain on one crypto asset is offset against a loss on another. On the other hand, a loss that is not fully offset within the year cannot be carried forward to the next year. So if you carry an unrealised loss over into the new year, it can no longer be offset against gains from the following year onward. Selling within the year to realise the loss lets you deduct it from that year's gains. Whether to buy the same asset back after selling is an investment decision — separate from what is allowed for tax purposes — that should be made with price movement and fees in mind.
Can crypto losses be carried forward? The offsetting rules →
4. Claim every necessary expense
Income is calculated by deducting necessary expenses from total revenue. Necessary expenses are limited to the cost of disposal of the crypto asset and the fees paid on the sale, plus only the portion of internet/smartphone line charges and PC purchase costs etc. that is 'recognised as expenditure directly necessary for selling the crypto assets' (FAQ 2-3). For expenditure that mixes private and business use, such as line charges, only the portion clearly attributable to crypto-asset trading can be expensed. This depends on keeping receipts and a basis for the apportionment.
5. Choose your valuation method (total-average or moving-average)
The year-end valuation used to calculate the cost of disposal is worked out using either the total-average method or the moving-average method. If no notification is filed, the total-average method applies (A1-20, FAQ 2-5). Because the total-average method uses a unit price calculated by dividing the year's total purchase amount by the quantity purchased, buying more at a high price in the second half of the year can raise the unit price and reduce the calculated gain on sales made earlier in the year. The moving-average method updates the unit price each time you buy, so the result is closer to your actual trading profit or loss. Which is more favourable depends on your trading pattern. The method is selected per type of crypto asset, and you must submit a 'Notification of Valuation Method for Crypto Assets for Income Tax' by the filing deadline for the year you first acquired the asset. To change method, you must submit an application for approval of the change by 15 March of that year and receive approval (FAQ 2-6, A1-25).
6. Keep books if annual income exceeds ¥3,000,000
If your income from crypto-asset transactions for the year (the total of sale proceeds etc.) exceeds ¥3,000,000, the profit is in principle classified as business income if you keep the required books and records, or in principle as miscellaneous income (miscellaneous income related to a business) if you do not (FAQ 2-2, updated December 2025 (Reiwa 7)). If it counts as business income, the Income Tax Act's loss-offsetting rules and the blue-return system come into play, but even with books kept, cases where profit-seeking intent is not recognised are judged individually. Anyone trading at a scale that might apply should keep transaction records as formal books and consult a tax accountant.
7. Keep the start of separate self-assessment taxation (20%, 3-year carryforward) in mind
The Fiscal 2026 (Reiwa 8) Tax Reform Outline (approved by the Cabinet on 26 December 2025), premised on amendments to the Financial Instruments and Exchange Act and related laws, states that disposals etc. of 'specified crypto assets' (limited to crypto assets registered in the register of financial instruments business operators) handled through crypto-asset exchange businesses will be taxed separately from other income at 20% (15% income tax, 5% resident tax), with losses that cannot be fully deducted eligible for carryforward for up to 3 years. This will apply to disposals etc. made from 1 January of the year after the year in which the amended law takes effect, which — as set out in another article on this site — is expected to be 1 January 2028 at the earliest. The Outline contains no provision for bringing losses incurred before the new regime starts into it. Waiting for separate taxation is one possible choice, but be aware that it is limited to crypto assets on the register (whether assets handled only on overseas exchanges will be covered is undecided) and that the start date is not yet fixed.
When does Japan's 20% crypto tax start? →
8. File a return and keep records (not filing is not a strategy)
Forgetting to file a return incurs an additional tax for non-filing and delinquency tax (Tax Answer No. 2024), and a system is now in place for overseas exchange transaction information to reach the NTA through the automatic exchange of information under CARF (Crypto-Asset Reporting Framework), which took effect in January 2026. The NTA's own results for the FY2024 (Reiwa 6) operational year show 613 on-site audits targeting crypto-asset transactions. 'It's overseas' or 'it's a small amount' is not a tax-saving strategy — it only results in paying additional tax and delinquency tax later on top of what was owed.
Are overseas exchange crypto gains reported to Japan's tax office? CARF and audits →
'Tax-saving methods' you should not use (there is no loophole)
Searches often turn up phrases like 'crypto tax loophole' or 'won't be noticed', but the methods below do not reduce your tax burden — they count as tax evasion or under-reporting and are subject to additional tax.
- Not declaring profit from overseas exchanges: residents of Japan are taxed on all income regardless of where it arises, and CARF brings information from exchanges to the tax authorities
- Leaving gains in USDT or another crypto asset on the theory that 'it's not taxable because I haven't converted to yen': it is taxed as a disposal at the time of exchange (FAQ 1-3)
- Spreading funds across accounts in family members' or acquaintances' names: even with a borrowed name, the income belongs to the person who actually traded, and the borrowed-name arrangement itself creates a separate problem
- Cashing out in small amounts to avoid filing: tax is judged on the annual total, and splitting it up does not change that total
- Not keeping transaction records: if the acquisition cost is unknown, only an amount equal to 5% of the sale price is allowed as the acquisition cost (FAQ 2-7), which ends up calculating a larger income than if records had been kept
When a company holds crypto assets, those with an active market are marked to market at the end of the fiscal year, with the valuation gain or loss included as taxable income or a deductible loss (FAQ 3-1-3), so corporate tax can apply to an unrealised gain even without a sale. The calculation mechanism differs between individuals and companies, not just the tax rate, so it cannot be said flatly that 'incorporating is advantageous'.
Practical notes for users of overseas exchanges (MEXC, BingX)
Overseas exchanges do not issue the 'annual transaction reports' that domestic exchanges provide. NTA FAQ 2-7 advises that for transactions through an overseas crypto-asset exchange business, you confirm the acquisition and sale prices using your bank account's deposit/withdrawal records, the exchange's transaction history, and the rates the exchange publishes. Because USDT-denominated transactions must have their gains and losses calculated in yen converted at the exchange rate on the date of the transaction, downloading your transaction history during the year and keeping it together with the basis for the yen conversion (the source of the rate used) is a precondition for carrying out strategies 1–5 above.
How to file a crypto tax return on an overseas exchange (calculations, worksheet, payment) →
This article is general information based on National Tax Agency and Ministry of Finance publications as of 22 September 2026, and is not individual tax advice or tax-saving advice. Because the tax amount depends on your overall income and deductions, consult a tax accountant or your local tax office for specific decisions.
Frequently asked questions
Q. Is crypto tax-free as long as I just hold it?
A. Yes. Income tax applies to the gain when you dispose of crypto assets you hold — by selling, exchanging or paying with them — and no income arises merely from holding, even with an unrealised gain (NTA FAQ 1-1 to 1-3). Moving between accounts or wallets in your own name is also not taxable in itself.
Q. What is the single most effective crypto tax-saving strategy?
A. There is no one method that decides it. Because aggregate taxation uses progressive rates, the three basic approaches are spreading profit-taking across years, realising unrealised losses within the year to offset gains, and claiming every necessary expense. For salaried employees, the ¥200,000 line (whether an income tax return is required) is also a factor. All of these are ideas confirmed within National Tax Agency publications; if the amounts involved are large, consult a tax accountant.
Q. Are there any loopholes in crypto tax?
A. No. Methods such as not declaring profit from overseas exchanges, spreading funds across accounts in other people's names, or cashing out in small amounts do not reduce your tax burden — they are subject to additional tax for non-filing and delinquency tax. Information from overseas exchanges reaches the NTA through CARF, which took effect in January 2026.
Q. Is crypto-to-crypto exchange, or exchanging into USDT, taxable?
A. Yes. Exchanging a crypto asset you hold for another crypto asset counts as disposing of the asset exchanged, and income is calculated using the purchase price of the crypto asset acquired as the disposal price (NTA FAQ 1-3). It is income for the year of the exchange even if you have not converted it back to yen.
Q. Can crypto losses be carried forward to the next year?
A. Not under the current system. A loss in miscellaneous income cannot be offset against other income (FAQ 2-11), and it cannot be carried forward to the next year either. The Fiscal 2026 (Reiwa 8) Tax Reform Outline sets out a 3-year loss carryforward for disposals etc. of specified crypto assets subject to separate self-assessment taxation, but this will apply only to disposals etc. from 1 January of the year after the year the amended law takes effect.
Q. Which is more favourable, the total-average method or the moving-average method?
A. It depends on your trading pattern. The total-average method calculates the cost of disposal using the average unit price for the year, while the moving-average method updates the unit price each time you buy, so the income amount for the year differs even for the same trades. The total-average method applies if no notification is filed; to use the moving-average method, submit a notification of valuation method by the filing deadline for the year you first acquired the asset (NTA A1-20, FAQ 2-5).
Q. Do the same tax-saving strategies apply to profit on overseas exchanges (MEXC, BingX)?
A. Yes. Residents of Japan are taxed on all income regardless of where it arises, and profit on overseas exchanges is calculated the same way, as miscellaneous income. However, because there is no annual transaction report, you must download your own transaction history and keep the basis for the yen conversion yourself (FAQ 2-7).
Sources
- National Tax Agency (Japan) | Tax treatment of crypto assets, etc.: FAQ, last revised December 2025 (PDF, Japanese) →
- National Tax Agency (Japan) | Tax Answer No. 1900: Salaried employees who must file a return (current as of 1 April 2026) (Japanese) →
- National Tax Agency (Japan) | Tax Answer No. 2260: Income tax rates (current as of 1 April 2026) (Japanese) →
- National Tax Agency | Tax Answer No. 2250 Offsetting profits and losses (law as of 1 April 2026; Japanese) →
- National Tax Agency (Japan) | Tax Answer No. 2024: Filing after the deadline (penalty for failure to file, late-payment tax) (Japanese) →
- National Tax Agency | A1-20 Notification of the valuation method for crypto assets (income tax; total-average method applies if no notification; Japanese) →
- National Tax Agency | A1-25 Application for approval to change the valuation method for crypto assets (Japanese) →
- Ministry of Finance | Outline of the FY2026 (Reiwa 8) Tax Reform, approved by Cabinet on 26 December 2025 (PDF, Japanese): review of the taxation of crypto assets →
- National Tax Agency (Japan) | Automatic exchange of information under the Crypto-Asset Reporting Framework (CARF) (Japanese) →
- National Tax Agency (Japan) | Status of income tax and consumption tax audits, FY2024 operational year (December 2025, PDF, Japanese) →
- Ministry of Internal Affairs and Communications | Individual resident tax (10% income-based rate: 4% prefectural + 6% municipal; Japanese) →
FX Textbook is an independent information site, not an exchange or a provider of personal investment advice. Crypto-asset trading involves risk: price volatility, liquidation of leveraged positions, transfer mistakes and the operational risk of exchanges and service providers can cause you to lose some or all of your invested capital. No result is guaranteed.
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