Short answer: As of 2026, crypto profits in Japan are taxed as "miscellaneous income" (雑所得) under progressive rates that reach roughly 55% including local tax. A proposed reform to the Financial Instruments and Exchange Act (FIEA) would move crypto to separate self-assessment taxation at a flat ~20% — the same bracket as stocks. If passed, it is expected to apply from fiscal year 2027. So today the ceiling is still ~55%; the 20% rate depends on the bill actually passing.
That single change is one of the biggest stories in Japanese crypto right now. Here's what it means and what to do in the meantime.
The current (2026) crypto tax in Japan
- Category: miscellaneous income (雑所得), taxed under the progressive system
- Rate: up to ~55% including national + local (resident) tax at the top bracket
- Loss offset: you generally cannot offset crypto losses against other income
- Loss carry-forward: not allowed
The higher your salary, the higher the rate on your crypto gains — which is exactly why Japan has had a reputation for taxing crypto harshly.
What the FIEA reform would change
| Item | Current (2026) | Proposed reform |
|---|---|---|
| Income category | Miscellaneous (aggregate) | Separate self-assessment |
| Rate | Up to ~55% | Flat ~20% |
| Loss offset | No | Expected: yes |
| Loss carry-forward | No | Expected: yes |
| Applies from | Now | FY2027, if passed |
This is a proposal, not law yet. Confirm the current position with Japan's National Tax Agency (NTA) and the Financial Services Agency (FSA) before relying on it.
When would the 20% rate start?
If the National Diet passes the bill, the flat ~20% treatment is expected from fiscal year 2027. Because it is not yet finalized, 2026 gains must still be filed under the current miscellaneous-income rules (up to ~55%).
What to do now (practical steps)
- Save all transaction history — download exchange CSVs regularly; records stay mandatory after any reform.
- File 2026 gains under current rules — plan for the up-to-55% treatment.
- Use FSA-registered domestic exchanges — bitFlyer, Coincheck, bitbank, GMO Coin make JPY funding and record-keeping easier.
- Consider timing large realizations — if the reform gains momentum, a tax accountant (税理士) is worth it.
- Self-custody for long-term holdings — the exchange is where you buy; a hardware wallet (Ledger/Trezor) is where you store.
FAQ
How much is crypto tax in Japan in 2026?
Crypto is taxed as miscellaneous income, up to roughly 55% including resident tax.
When does the 20% rate start?
If the FIEA reform passes, it is expected from fiscal year 2027. It is not confirmed as of 2026.
Can I carry losses forward?
Not under current rules. The reform is expected to allow it, but only if enacted.
Which exchange should I use?
FSA-registered domestic exchanges (bitFlyer, Coincheck, bitbank, GMO Coin) are the safest for JPY funding and record-keeping.
Educational information, not tax or financial advice; the reform is under deliberation and details may change. Verify with the NTA/FSA. Full Japan exchange comparison and JPY funding guide: Best Crypto Exchange in Japan.
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