Is the cost basis for FX cash pair trades FIFO?

TWS and other trading screens will display an Average Price for your executions using FIFO. As there is no Cost Basis reporting for Forex like there is when trading securities, there is no way to change a "Cost Basis method" for your Forex trades.

IBKR provides a Forex Income Worksheet that provides income and loss information from your completed currency transactions for the year.

Additional Information

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Are clients allowed to change cost basis information?
How do I configure the tax basis for the account?
What is the Forex Income Worksheet?
Are FX gains and losses included in the Form 1099-B?