Bitcoin Mining: What Is It and How Does It Work?

Bitcoin mining uses application-specific integrated circuit (ASIC) machines to repeatedly hash block data until they produce a value below the network’s current difficulty target. The first miner to find a valid hash broadcasts the block, the network accepts it, and the miner receives the 3.125 BTC block subsidy plus that block’s transaction fees. Proof of work makes altering past blocks extremely costly. This is how it secures Bitcoin.

The April 2024 Bitcoin halving reduced rewards from 6.25 BTC to 3.125 BTC. That cut revenue per terahash, so machine efficiency and power prices now decide whether a miner makes money. Most small operators now join mining pools to smooth payouts. In the US, the fair market value of each reward is ordinary income on the day you control it. If you later sell those coins, any price change from that day to the sale is a separate capital gain or loss.

"Crypto mining can be lucrative and comes with tax challenges every miner needs to understand. Miners operating in the US must know the IRS considers mined crypto taxable income, which needs to be reported. We stronlgy recommend that crypto miners keep complete records of mining activities and keep informed about the latest tax rules. This allows effective management of tax liabilities and hopefully avoid surprises down the road.”

- Ty Gaines, EA, Tax Expert at TokenTax

Mining validates pending transactions and orders them into an immutable chain. In practice, that means:

• Validated transactions are grouped into blocks that follow strict consensus rules.

• The ledger is synchronized across thousands of nodes.

• Security scales with total hash rate because an attacker would need to outcompete the honest network to alter history.

Without proof-of-work miners, Bitcoin would not have a reliable way to prevent double-spending or provide open, censorship-resistant settlement.

Profitability depends on inputs you control and on market variables you cannot. The key drivers are electricity price and uptime, ASIC efficiency measured in joules per terahash, Bitcoin price, network difficulty, fee levels, hosting and maintenance costs, and pool fees.

As of October 25, 2026, each terahash per second earned about 0.00000042 BTC a day, roughly $0.033 at a BTC price near $79,600 and a network hash rate near 1,078 EH/s. A 200 TH/s machine would gross about $6.70 per day before electricity and pool fees, and that figure declines as difficulty increases.

Even with efficient gear, high power costs can quickly erode margins. At industrial scale, miners model a range of BTC prices and difficulties, size their electrical infrastructure accordingly, and hedge where possible. Hobby miners should be conservative, assume difficulty trends higher over time, and recognize that pool payouts can be lumpy when fee revenue rises or falls.

Electricity costs alone illustrate how difficult it can be to maintain mining profit margins. For example, a mining machine drawing 3,000 watts continuously uses 72 kilowatt-hours of electricity per day. At a hypothetical rate of $0.12 per kWh, that works out to $8.64 daily, or $259.20 over 30 days, before cooling, hardware, and other expenses.

Mining revenue must exceed those costs for the operation to generate a profit. Miners should also account for equipment depreciation, pool fees, maintenance, and changes in network difficulty rather than relying on Bitcoin's price alone. Readers comparing equipment can review our guide to Bitcoin mining hardware.

Joining a mining pool spreads variance. Your rig contributes a share of work to the pool and you receive pro rata payouts based on the pool’s luck and the payout scheme. This improves cash flow predictability but reduces the chance of a single large solo win.

Here are the basics to get up and running with Bitcoin mining:

• A crypto wallet: Create or use a secure Bitcoin wallet for pool payouts. For long-term storage, consider

  hardware cold storage wallets reviewed by our team. Back up the seed phrase offline in at least two secure, completely private locations, and never share it.

• Mining software: Download the pool-recommended miner for your ASIC and operating system and learn how to configure it. Compare options in our guide to

  Bitcoin mining software.

• Computer equipment and power: Pick an ASIC that fits your budget and your power rate. Check amperage, voltage, and cooling against your panel before you buy. Most units draw several kilowatts continuously, so plan for wiring, breakers, ventilation, and noise control up front.

• Record-keeping: Save each mining payout's date, time, cryptocurrency amount, USD fair market value, and receiving wallet or pool. Keep records of electricity costs, equipment purchases, repairs, and pool fees. These details help you evaluate profitability and calculate income and cost basis for taxes.

Different methods of Bitcoin mining

Bitcoin mining has evolved from hobby gear to purpose-built machines. The method you choose ultimately depends on cost, efficiency, and your goals. For Bitcoin itself, ASICs lead in performance and energy use. Other proof-of-work networks may still support general-purpose hardware.

Each approach has tradeoffs. Entry cost, power draw, heat, and noise vary by device class. Your location, electricity price, and comfort with maintenance will shape the best path. If you are determined to mine Bitcoin, plan accordingly for ASICs. If you want to learn and experiment, smaller coins can be a safer starting point.

CPU mining

Early miners used standard computers, but CPUs can no longer keep up with Bitcoin’s difficulty today. A few smaller proof-of-work chains still allow CPU mining for education or low-stakes experimentation.

FPGA mining

FPGAs once offered better efficiency than GPUs and let miners tune bitstreams. ASICs have passed them for Bitcoin. That said, FPGAs can still work in niche setups with very tight power limits and/or custom workloads.

ASIC mining

ASICs dominate Bitcoin mining by delivering far more hashes per watt than general-purpose gear. They're single-purpose, loud, and power hungry, with a higher upfront cost, but they provide the performance needed to mine Bitcoin at scale.

Cloud mining

Some miners skip hardware and rent hash rate or use hosted contracts. Do your homework. Read the terms, fees, payout math, and withdrawal rules. Assess counterparty risk and uptime. Start small and only commit funds you can afford to lose. Before you buy, compare providers in our guide to the best Bitcoin cloud mining platforms.

• Price volatility: The Bitcoin price can move sharply in either direction. As of October 2026, Bitcoin traded near $79,600, about 37% below its all-time high of about $126,000 set in October 2025. That affects revenue immediately while power bills remain fixed. Size your operation to withstand drawdowns.

• Regulatory uncertainty: In the US, mining is shaped by state energy, permitting, and environmental rules, and some countries have banned or restricted mining. Check the rules in the areas where your machines will run.

• Operational risk: ASICs can run hot and loud. Simple things like dust, heat, and moisture can shorten your equipment's lifespan. Keep spares. Plan for repairs.

• Counterparty and security risk: Hosted mining and cloud contracts mean you rely on third parties. Use reputable providers. Use strong passwords and two-factor authentication, and keep your information secure.

Yes. In the US, mined coins are ordinary income at fair market value when you receive them and have control (IRS Notice 2014-21). If you later sell, swap, or spend these coins, you report a capital gain or loss measured from the value you reported as income. Report hobby mining income on Schedule 1 (Form 1040) as other income. You can't deduct hobby expenses such as electricity or equipment, because miscellaneous itemized deductions aren't allowed under current law. If your mining is a trade or business, report it on Schedule C, deduct ordinary and necessary costs like power, pool fees and equipment, and pay self-employment tax on your net earnings using Schedule SE.

For the full rules, see our crypto mining tax guide and the IRS digital asset FAQs. For those outside the US, look at our helpful international crypto guides for more information. US taxpayers should see the current tax rates for cryptocurrency.

Bitcoin’s block reward is 3.125 BTC after the April 2024 halving. The next halving is expected around April 2028, at block 1,050,000. Difficulty retargets every 2,016 blocks, about every two weeks, to keep block times near ten minutes. Miner revenue can increase as on-chain activity generates more fees.

The Cambridge Centre for Alternative Finance estimated Bitcoin mining used about 120 terawatt hours of electricity worldwide in 2023, within a range of 67 to 240, and the EIA put US crypto mining at 0.6% to 2.3% of US electricity use. The total rises and falls with price and hardware efficiency as machines switch on and off. The US is one of the largest mining countries, and the rest of the hash rate sits mostly in regions with cheap power.