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A token swap/migration occurs whenever an old coin is exchanged for a new coin (e.g. MCO converting to CRO). It is generally not considered a taxable event when the associated fee is in fiat. The tax logic is the same as a transfer. However, if the associated fee is settled in crypto, there may be a difference between the FMV and adjusted cost basis of the crypto used to settle the fee, which may result in capital gain/loss. See additional information on fees below.