How Mined Bitcoin Is Taxed
When Mining Rewards Count as Income
The IRS has treated mined Bitcoin as gross income since Notice 2014-21. You report the fair market value in U.S. dollars on the exact date and time the coins land in your wallet. For example, a solo miner who earned 0.03125 BTC on March 12, 2025, when the price hit $82,400, added $2,575 to taxable income that day. This rule applies whether you run one ASIC or a 50 MW facility. Exchanges and pool operators issue 1099-NEC forms once annual rewards exceed $600, but you must track every reward yourself even without a form. Waiting to sell does not defer the income tax; the IRS taxes receipt, not disposition. Miners who ignore this step create immediate underpayment risk and lose the ability to establish clean records later.
Setting Cost Basis With Specific Identification
Once you include the mining reward as income, that same dollar amount becomes your starting cost basis. You can later use specific identification to sell the highest-basis units first under HIFO, provided you keep timestamped wallet records and exchange statements. A miner who received 0.25 BTC across four dates in 2024 at values of $18,400, $41,200, $67,900, and $92,100 can choose to sell the $92,100 lot and report zero gain. IRS Form 8949 instructions explicitly allow this method when adequate records exist. Without those records you default to FIFO and pay more tax. Rev. Proc. 2019-09 confirms that contemporaneous logs satisfy the identification requirement, so most serious miners now export CSV files daily from their pools and wallets.
Reporting Requirements on Form 8949 and Schedule 1
You list every mined Bitcoin receipt on Form 8949 as a non-cash transaction even though no sale occurred. Enter the fair market value as both proceeds and basis so the net adjustment flows to Schedule 1 as other income. In 2025 a 3 MW operation that mined 42.7 BTC reported $3.48 million of ordinary income this way before any capital gains from later sales. Failure to report the income line triggers automatic notices because the IRS now receives direct data from major pools. Keep the supporting valuation screenshots and block timestamps for at least seven years. Publication 550 requires you to treat the activity consistently from year to year once you choose business or hobby treatment.
Business Treatment and Record-Keeping Reality
Running mining as a business lets you deduct electricity, hardware depreciation, and facility costs against the mining income. A 10 MW site in Texas that spent $4.1 million on power in 2025 offset most of its $5.9 million reward income and still claimed $820,000 in accelerated depreciation on new ASICs. Hobby miners receive no such offsets and must report the full fair market value without expense deductions. The IRS looks at profit motive, scale, and record quality to decide which category applies. Once you cross into business treatment you also face quarterly estimated tax payments. Exit Velocity imports pool data daily and tags each reward with the correct fair market value so your CPA can generate clean 8949 entries without manual spreadsheets.
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Frequently Asked Questions
Is mined Bitcoin taxable income?
Yes. IRS Notice 2014-21 states that Bitcoin received from mining is ordinary income at its fair market value on the date of receipt. A miner who earns 0.0625 BTC when the price is $81,000 reports $5,062.50 of income that day regardless of later price moves. This applies to both hobby and business miners. You must track every reward even if your pool does not issue a 1099.
What's the cost basis of mined Bitcoin?
The cost basis equals the U.S. dollar fair market value you already included as income on the receipt date. With proper timestamped records you can later apply specific identification and sell the highest-basis coins first under HIFO. A miner who received 0.18 BTC at an average $64,000 basis can sell those exact units and report minimal or zero capital gain when Bitcoin trades at $95,000.
How do I report mining as a business?
Report all mining rewards as business income on Schedule C and deduct ordinary expenses including electricity and depreciation. In 2025 one 8 MW operation reported $7.2 million in rewards and offset $5.9 million in power and hosting costs. You must also make quarterly estimated payments and keep contemporaneous records of every block reward and its dollar value at receipt.
Hobby vs business mining tax treatment
Business treatment allows full expense deductions against mining income while hobby treatment only requires reporting the income with no offsets. The IRS examines profit motive, activity scale, and record quality. A solo miner running two ASICs at a net loss each year usually stays hobby. A 5 MW facility with dedicated staff and consistent profits qualifies as a business and can deduct power, cooling, and hardware depreciation.
What about self-employment tax?
Business miners owe self-employment tax on net profit after expenses. A Texas operation with $420,000 net profit in 2025 paid roughly $59,000 in self-employment tax before income tax. Hobby miners avoid this tax entirely but also lose all deductions. Keep detailed expense logs and consult a CPA who understands cryptocurrency operations before choosing business treatment.
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