Bitcoins held as capital assets are taxed as property
If Bitcoin is held as a capital asset, you must treat them as property for tax purposes. General tax principles applicable to property transactions apply. Like stocks or bonds, any gain or loss from the sale or exchange of the asset is taxed as a capital gain or loss. Otherwise, the investor realizes ordinary gain or loss on an exchange.
Bitcoin miners must report receipt of the virtual currency as income
Some people "mine" Bitcoin by using computer resources to validate Bitcoin transactions and maintain the public Bitcoin transaction ledger.
According to the IRS, when a taxpayer successfully “mines” Bitcoin and has earnings from that activity whether in the form of Bitcoin or any other form, he or she must include it in his gross income after determining the fair market dollar value of the virtual currency as of the day you received it. If a bitcoin miner is self-employed, his or her gross earnings minus allowable tax deductions are also subject to the self-employment tax.
Please see this article: Tax Tips for Virtual Currency
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