DianeW777
Expert Alumni

Investors & landlords

The cost of your BTC doesn't change with any transaction.  The traded property received has the same basis of $10,000 because you did not add additional funds for the margin transaction.  An anticipated amount of income is not relevant, therefore since the $20,000 was never realized or included in taxable income, there is only your original cost basis to apply to the final liquidating transaction.

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