• Japan-regulated FX brokers: 20.315% flat separate filing.
  • Overseas FX and prop firm payouts (withdrawals of profit shares): miscellaneous income, progressive rates.
  • Loss carry-forward: three years for domestic FX only.
  • Keep detailed records of trades and JPY conversion rates at the time of receipt.

FX tax treatment in Japan depends entirely on where the broker or prop firm is registered. In practice, the same trading activity can be taxed under different regimes purely because of the counterparty’s jurisdiction.

Domestic FX (Japan-regulated brokers)

Profits from Japan-registered FX brokers fall under separate filing for futures and options:

  • Flat rate of 20.315% (national plus local).
  • Loss carry-forward available for three years.
  • Reported separately from salary and other income.

Specifically, brokers like GMO Click, DMM, and SBI fall in this category. The 20.315% rate is favorable compared to progressive miscellaneous-income brackets at higher income levels.

Overseas FX brokers and prop firms

By contrast, profits from non-Japan-registered firms are treated as miscellaneous income:

  • Progressive rates from 5% to 45% national, plus 10% local.
  • Combined with salary and other income.
  • No loss carry-forward across years.

Most prop firms (FTMO, FundedNext, The5%ers, FundingPips, FinTokei) sit in this category because they’re not registered Japanese financial firms. Payouts are typically denominated in USD or EUR and converted to JPY at the receipt date.

Records to keep

In short, regardless of category, maintain:

  • Trade-by-trade history exports from the platform.
  • Payout records with USD-to-JPY conversion rates at each receipt date.
  • Receipts or transfer records from the broker or prop firm.

That said, the exact paperwork accepted by a tax office varies. Consolidated annual statements often suffice for domestic brokers; overseas income usually requires more granular evidence.

Consult a licensed tax professional for your situation.

Tax rules change, and the right declaration depends on your overall income mix, residency status, and the specific firms you trade through. This guide is general information, not advice.

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