File Your IBKR Taxes in Japan

Interactive Brokers' reports use the wrong calculation method. We fix that.

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Why Your Broker's Report Won't Work

Example: You trade X stock

Buy 10 shares @ $150 on 1/1/2024

Buy 10 shares @ $200 on 1/1/2025

Sell 5 shares @ $220 on 1/1/2026 (¥156.73 USD/JPY)

🇺🇸 Your 1099-B (FIFO)

Cost: $150 × 5 = $750 (earliest shares are sold)

Proceeds: $1,100

Gain: $350

What your broker reports

🇯🇵 Japan NTA (Moving Avg)

Avg: ($150 + $200) ÷ 2 = $175

Cost: $175 × 5 = $875

Proceeds: $1,100

Gain: $225

Correct calculation method

Continuing from the X stock example above...

Cost Basis (in JPY)

1/1/2024 buy: 10 shares × $150 × ¥140.95 = ¥211,425

1/1/2025 buy: 10 shares × $200 × ¥157.71 = ¥315,420

Avg: ¥26,342/share → 5 shares = ¥131,711

Proceeds (in JPY)

1/1/2026 sell: 5 shares × $220 × ¥156.73

= ¥172,403

Broker says: $225 gain

Correct filing: ¥40,692 gain

Report the wrong number and you're risking an audit. Spread this across hundreds of trades and you could find yourself off by a large amount.

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