Fair Market Value
Fair market value is the price at which an asset would change hands between a willing buyer and a willing seller in an open and competitive market. In the context of cryptocurrency, this is typically determined by the spot price on a major, liquid exchange at the time of the transaction.
For tax purposes, fair market value is used to calculate the proceeds of a sale or the cost basis of an asset received as income. Because crypto prices can fluctuate rapidly, the exact timestamp of a transaction is critical for determining the correct fair market value.
Regulators require that taxpayers use a consistent and verifiable source for these valuations. Discrepancies in fair market value reporting can lead to audits or penalties.
It is a fundamental metric for valuing digital assets and derivatives.