Best crypto tax software in Japan.
Japanese crypto filers face miscellaneous income (雑所得 zatsu shotoku) treatment at marginal rates up to 55% — among the harshest in the developed world. Losses cannot be offset against other income or carried forward. The right software calculates per-disposal income at JPY market value and produces an NTA-ready summary.
What makes crypto tax filing tricky in Japan.
Japan has one of the most punishing crypto tax regimes globally. Crypto gains are classified as 'miscellaneous income' (雑所得 zatsu shotoku) — taxed at the same progressive scale as ordinary salary, up to 45% national tax + 10% local inhabitant tax (combined effective rate up to 55%). Critically: losses cannot be netted against other income types and cannot be carried forward — every taxable year stands alone. Crypto-to-crypto trades ARE taxable events at JPY-equivalent fair market value. There's a small relief: salaried workers (kyuyo shotoku-sha) don't need to file if their total miscellaneous income is under ¥200,000 (~$1,300). Above that, full filing is required with per-transaction reporting. Industry groups have been pushing the NTA for years to move to a 20% flat capital-gains regime aligned with securities (and there are bills in the Diet), but as of 2026 no reform has passed. The Web3 White Paper backed by LDP recommends moving to 20% flat by 2027 — software vendors should be ready for that pivot.
Ranked for Japan filers.
Japan crypto tax questions.
What crypto tax forms do Japanese filers need? +
How is crypto taxed in Japan? +
What is the ¥200,000 threshold? +
When are Japanese crypto taxes due? +
Which crypto tax software is best for Japanese filers? +
The Japan rules that drive software choice.
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Miscellaneous income (雑所得 zatsu shotoku) classification
Effective 2017NTA classified crypto disposals as miscellaneous income, NOT capital gains. Taxed on the progressive scale (national 5-45% + 10% local inhabitant) up to a combined ~55%. Losses cannot be netted against other income types (no offset against salary, dividends, etc.).
What this means for your software: Software must convert every transaction to JPY at the transaction-date market rate and feed the annual aggregate into kakutei shinkoku. Koinly and Summ support Japan; Gtax (Japanese-built) handles the full kakutei shinkoku workflow.
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¥200,000 filing threshold for salaried workers
Effective 2017Employees whose total ANNUAL miscellaneous income (not just crypto) is under ¥200,000 don't need to file a kakutei shinkoku. Self-employed, professional traders, and anyone with side income above the threshold must file.
What this means for your software: Software should clearly show whether your annual crypto income crosses ¥200,000. Many casual traders sit below the threshold and have no filing obligation.
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Crypto-to-crypto = taxable event
Effective 2017Every disposal, including crypto-to-crypto swaps (BTC → ETH, USDT → USDC), is a taxable event. The gain is calculated as the JPY-equivalent fair market value of the received asset minus the JPY cost basis of the disposed asset.
What this means for your software: Software must pull JPY exchange rates for every trade timestamp. Tools that default to USD-based reporting need to add a JPY conversion layer — this is the most common source of errors for filers using international software.
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No loss carryforward
Effective 2017Crypto losses in one year CANNOT be carried forward to offset gains in future years. This is one of the harshest features of Japan's regime — losses are 'used' only against the same year's miscellaneous-income gains, and otherwise lost.
What this means for your software: Software should clearly distinguish 'available loss' from 'wasted loss' for Japanese filers — filers may want to realize gains in down years to use up losses before they expire at year-end.
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Web3 White Paper — proposed 20% flat rate
Effective 2027 (proposed)LDP's Web3 Project Team has consistently recommended moving crypto from miscellaneous income to a 20% flat capital-gains regime aligned with securities. Multiple Diet bills have been introduced; as of 2026 none have passed. Industry expects the change by 2027.
What this means for your software: Software vendors should watch the NTA's 2026 budget submission for signals on whether the 20% flat rate will be adopted for the 2027 tax year. Filers may want to defer realization until clarity.
What's changed for Japan crypto filers.
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FSA + NTA propose 20% flat rate for 2027
Joint FSA and NTA reform proposal floated a 20% flat rate on crypto gains starting fiscal 2027, aligning with stocks. Subject to Diet approval in the 2026 ordinary session. Industry response broadly positive but enactment uncertain.
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NTA updates self-trade calculation guidance
FAQ-style guidance clarified that every crypto-to-crypto swap (including stablecoin-to-stablecoin) is a taxable event at JPY-equivalent fair market value. Removed prior ambiguity that some filers had used to skip stablecoin swaps.
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Corporate crypto tax reform takes effect
Japan reformed corporate crypto-holdings taxation, removing the year-end mark-to-market rule for issuer-held tokens. Did not change individual rules (still miscellaneous income at marginal rates), but signaled NTA's gradual openness to reform.
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