How to Keep Crypto Trade Records for Japan Tax Filing
Keep complete trade, funding, and futures history exported from every exchange you used, with date, trading pair, quantity, and JPY value at execution time for each entry. Track wallet transfers separately since moving your own coins is not a taxable event. Confirm current rules with the NTA or a licensed tax accountant.
If you trade crypto in Japan, keeping clean records is the difference between a straightforward tax filing and a stressful scramble every spring. The short answer is that you need complete trade, funding, and futures history exported from every exchange you used, with the date, trading pair, quantity, and JPY value at the time of each transaction, plus a separate log of any transfers between your own wallets. None of this is tax advice; it is a record-keeping framework, and the tax treatment itself should be confirmed with Japan’s National Tax Agency (国税庁, NTA) or a licensed tax accountant (税理士).
Japan does not have a crypto-specific reporting form the way some jurisdictions do. Instead, gains get folded into your regular income tax return as miscellaneous income, which means the burden of proof sits with you, not the exchange, especially if you traded on a platform based outside Japan. Exchanges can hand you a transaction history file. They generally cannot hand you a finished tax calculation that matches NTA methodology, and anyone promising that should be treated with some skepticism.
How is crypto taxed in Japan in 2026?
As of 2026, the NTA’s general position is that gains from selling, spending, or swapping crypto are treated as miscellaneous income (雑所得) for most individual investors, rather than capital gains taxed at the flat rate applied to listed stocks. That means the gain gets added to your other income and taxed under Japan’s progressive national income tax brackets, plus a separate resident tax. Because it is progressive, someone with modest crypto gains and modest other income may pay a relatively low rate, while someone with large gains stacked on top of salary income can end up paying a combined rate well above what a long-term stock investor would pay on the same profit. Rules and bracket thresholds change, so treat this as a starting point and confirm current figures directly on the NTA’s site before filing.
Mining income, staking rewards, and some airdrop scenarios can also be treated as income at the point received, with a separate calculation later when you dispose of the asset. These areas are exactly where a licensed tax accountant earns their fee, since the correct treatment depends on specifics the NTA’s general guidance does not always spell out clearly.
What records do you actually need to keep?
For each transaction, the fields that actually matter for a crypto tax calculation in Japan are narrower than most people assume:
- Date and time of the trade
- Trading pair or asset involved
- Quantity bought or sold
- The JPY value at the time of execution (not today’s value)
- Fees paid, and whether they were paid in the base asset or a separate token
- Whether the event was a trade, a funding payment, a futures settlement, or an internal transfer
If an exported file is missing the JPY value at execution time, you will need to reconstruct it from historical price data, which is extra work and an extra place for errors to creep in. This is one reason it pays to check an exchange’s export format before you rely on it heavily; our AI tools for crypto research guide covers how to vet calculation tools without handing over more access than necessary.
Exporting trade, funding, and futures history from exchanges
Most exchanges split their data into separate feeds, and new traders often grab only the obvious one.
| Record type | Where it usually lives | Common gap |
|---|---|---|
| Spot trade history | Account or order history tab | Fine for basic buy or sell activity |
| Margin or futures history | Separate derivatives or contracts report | Funding fees often excluded by default |
| Funding fee history | Its own export, separate from trade history | Easy to forget entirely |
| Deposit and withdrawal history | Wallet or funds tab | Needed to confirm what came from where |
| Internal transfers | Sometimes mixed into withdrawal logs | Easy to misread as a disposal |
Domestic platforms such as bitFlyer tend to format exports with Japanese tax season in mind, since they operate under FSA registration. Offshore exchanges vary a lot in how granular their funding and futures exports are, so test the export on a small account before you are relying on it for a full year’s filing. Our exchange reviews, including BYDFi review, note what each platform’s export actually contains rather than just what the marketing page claims. BYDFi is not registered with Japan’s FSA, so if you use it (or any offshore platform) as a Japanese resident, treat it with the same due diligence as any other foreign exchange rather than assuming local protections apply.
Common mistakes with transfers between wallets
The single most common record-keeping error is treating every wallet-to-wallet movement as if it were a sale. Moving coins from an exchange to a hardware wallet, or between two addresses you control, is not a disposal under NTA guidance, because you still hold the same asset. But if you do not log the transfer at all, your cost basis can get separated from the coin, and when you eventually do sell, your moving average calculation will be wrong.
A related mistake is losing track of which exchange a coin came from after several transfers, which matters when you are trying to apply a single moving average cost basis across all your holdings rather than a separate basis per exchange (which the NTA does not recognize as a valid method). Keep a simple transfer log with date, amount, source wallet, and destination wallet, even if it feels redundant at the time.
Should you use a crypto tax calculator?
Third-party crypto tax calculation tools exist, and some traders use one to automate the moving average calculation once the raw exports are clean. We are not endorsing any specific calculator here, partly because the right one depends on which exchanges you used and how well their data imports, and partly because the output is only as good as the trade, funding, and futures history you feed into it. If you do try one, treat its output as a draft for your accountant to review, not a finished return, and never grant an automated tool withdrawal permissions on your exchange accounts; read-only API access or a manual CSV upload is the safer pattern. For general background on vetting any AI-assisted research or calculation tool safely, see our AI tools for crypto research guide.
Check before you register checklist
Before opening an account on any exchange you plan to use for trading in Japan, it helps to check a few things up front rather than after you need records for a filing.
- Registration status: is the exchange on the FSA’s registered list, confirmed directly on fsa.go.jp
- Withdrawal terms: any limits, delays, or extra verification steps on moving funds out
- Custody and transparency: whether the platform publishes any proof-of-reserves or custody information
- Fees: what the platform’s own fee schedule states, not a third-party estimate
- Support language: whether Japanese-language support exists if something goes wrong with your records
You can compare several platforms side by side on our exchange rankings table, and tools like the fee calculator can help you sanity-check what a platform’s published fee schedule actually costs you over a year of trading.
Final note on accuracy
None of this replaces professional advice. Japan’s crypto tax rules, thresholds, and filing deadlines are published and updated by the NTA and, for exchange registration, by the FSA. If any specific number in this piece conflicts with the current official guidance, the official source wins; confirm there before you file, and bring a licensed tax accountant into the conversation if your trading history across exchanges is complex.
Disclosure: themexc.com may earn a commission if you sign up with an exchange through our links, including BYDFi at bydfi.com. This does not change how we describe registration status or compliance risk.
Frequently asked questions
What records do I need to keep for crypto tax filing in Japan?
You need trade history, funding fee history, and futures or margin history from every exchange you used, each showing the date, pair, quantity, and the JPY value at the time of the transaction. Also keep a separate log of wallet-to-wallet transfers so you can distinguish real disposals from internal moves. The NTA (国税庁) has published general guidance on this at nta.go.jp, and it is worth confirming current requirements there since the details get updated.
How is crypto taxed in Japan in 2026?
As of 2026, the NTA treats crypto gains for most individuals as miscellaneous income, taxed under progressive national income tax rates plus resident tax rather than the flat rate applied to listed securities. For higher incomes this combined rate can run well above what equity investors pay, though exact brackets change, so confirm current figures on the NTA site. This is general information, not tax advice specific to your situation.
Which exchanges make it easy to export trade history for Japanese tax returns?
Most major exchanges, domestic and offshore, offer a CSV or spreadsheet export of spot, margin, and futures history from account settings or a reports tab. Domestic exchanges such as bitFlyer are built around Japanese tax season and often format exports accordingly, while offshore platforms vary in how granular their funding and futures logs are. Check our exchange reviews, including the [BYDFi review](/exchanges/bydfi/), for notes on what each platform's export actually includes.
Do I need to report small crypto gains under 200,000 yen in Japan?
For salaried employees with a single employer, the NTA has generally allowed miscellaneous income under 200,000 yen a year to go unreported on a final tax return, though this threshold has conditions and does not apply to everyone (for example, it does not apply if you are already required to file for other reasons). This is a simplified summary, not a ruling on your case, so confirm against current NTA guidance or ask a licensed tax accountant before assuming you are exempt.
Is using a foreign crypto exchange legal for Japanese residents in 2026?
Japan's Financial Services Agency (金融庁) maintains registration requirements for crypto exchanges operating in Japan, and using an exchange that is not on its registered list carries legal and consumer-protection risk, since you lose the safeguards that come with FSA oversight. Rules and the registered list change, so check the current list directly on fsa.go.jp before assuming any specific platform is compliant. No offshore exchange, including BYDFi, should be treated as FSA-registered or legal under Japanese financial law unless confirmed on that official list.
What is the moving average cost method required by Japan's NTA for crypto gains?
The moving average method blends the cost of every coin you acquire into a single running average cost basis, which is then used to calculate gain or loss each time you sell or spend that asset. The NTA accepts this as one of the standard calculation methods for crypto holdings, alongside a total average method applied at year-end, and the choice affects which years show gains versus losses. The exact mechanics and any changes for 2026 are best confirmed on the NTA's published guidance rather than from a summary.
What is the deadline for filing crypto taxes in Japan?
Japan's individual income tax filing period typically runs from mid-February to mid-March for the prior calendar year, and crypto miscellaneous income is reported within that same final tax return, not on a separate schedule. The NTA publishes the exact dates each year on nta.go.jp, and they can shift slightly, so do not rely on a past year's date. If your records are incomplete close to the deadline, a licensed tax accountant can advise on extensions or amended filings.
What is a common mistake people make when tracking wallet transfers for tax purposes?
The most frequent mistake is logging every wallet-to-wallet transfer as if it were a sale, which inflates apparent trading activity and can confuse a moving average cost calculation. Moving your own coins from an exchange to a self-custody wallet, or between two wallets you control, is not itself a disposal under NTA rules, but you still need to track it so your cost basis follows the coin correctly. Mixing up transfer records with trade records is one of the easiest ways to end up with a cost basis that does not match reality.