If you earn anything from your mining, you must include it as part of your gross income.
Your mining could be considered self employment or as a hobby. The IRS expects that if you start a business, you of course intend to make money at it. If you don't, your business is likely to be a hobby. But, to make the decision if your business is a hobby, the IRS looks at numerous factors, including the following:
For more information on how the IRS compares self employment to hobby income, please see this TurboTax Blog post.
If you’re self-employed, your gross earnings from mining (minus allowable tax deductions) will be subject to the self-employment tax. We’ll help you figure out the right amount.
If you were not given a 1099-MISC for your Bitcoin mining work, follow these steps in TurboTax to enter your income.