IRS Notice 2014-21 Frequently Asked Questions addressed 'mining'.
Q–8: Does a taxpayer who “mines” virtual currency (for example, uses computer resources to validate Bitcoin transactions and maintain the public Bitcoin transaction ledger) realize gross income upon receipt of the virtual currency resulting from those activities?
A–8: Yes, when a taxpayer successfully “mines” virtual currency, the fair market value of the virtual currency as of the date of receipt is includible in gross income. See Publication 525, Taxable and Nontaxable Income, for more information on taxable income.
The IRS would say that the income would be reported in the year of the date of receipt. In addition, 'mining' income may also be subject to self-employment income.
Consider contacting a tax professional who is experienced in these issues.
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