What Is Crypto Mining? How It Works, Costs & Tax Rules

Every Bitcoin in circulation exists because a miner solved a math problem, not because a central bank printed it. That's the short answer to what is crypto mining: computers compete to verify transactions and add them to the blockchain, and the winner earns newly created coins plus fees.

The economics have shifted substantially since Bitcoin's early years. Hardware, electricity, and shrinking rewards have squeezed the math enough to push casual miners toward pools and cloud contracts, and the IRS has made clear that mining income carries its own tax rules. Here's how it works, what it costs, whether it still pays off in 2026, and what you owe once the coins land in your wallet.

What Is Crypto Mining?

Crypto mining is the process of using computing power to verify transactions and add them to a blockchain, earning newly created coins and transaction fees as a reward. It's how proof-of-work networks stay secure without a bank in the middle: independent computers compete for the job, and the network trusts whichever one wins first.

Only proof-of-work coins are mined. Bitcoin, Litecoin, Kaspa, and Monero all rely on mining today. Ethereum switched to proof-of-stake, where validators lock up coins instead of burning electricity to earn staking rewards.

How Does Crypto Mining Work?

Miners bundle pending transactions into a candidate block and race to find a nonce, a number that makes the block's hash fall below a target value. That target adjusts automatically with the network's total hash rate, keeping block times roughly consistent as more miners join.

The first to find a valid hash broadcasts the block, other nodes verify it, and the winner collects the reward plus fees. This also guards against fraud: rewriting history would mean redoing that work for every later block fast enough to out-race everyone else combined. That's the basis of a 51% attack, and on a large network it's simply too costly to pull off.

Proof of Work vs. Proof of Stake

The proof of stake vs proof of work question comes down to how each network secures itself. Proof of work is the mining model above: miners spend real electricity for the right to add the next block.

Proof of stake replaces that computational race with financial commitment. Validators lock up, or stake, their own coins as collateral, and a dishonest one loses part of that stake instead. Ethereum, Cardano, and Solana run on proof of stake, and earning rewards this way is called staking rather than mining, with its own separate IRS guidance.

Solo Mining vs. Mining Pools

So why doesn't everyone just mine solo and keep the whole reward? Solo miners do keep 100% of any block reward they win, but on a network like Bitcoin, the odds of a home miner beating industrial-scale operations are close to zero. A crypto mining pool solves this by combining participants' hash rate and splitting rewards proportionally, trading a rare lottery-style win for smaller, steadier payouts.

Cloud Mining

Cloud mining lets you rent hashing power from a data center instead of buying hardware, in exchange for a share of what it mines and none of the noise or maintenance. It sounds appealing on paper. The trade-off: contract fees eat into your margin, and the space has a well-documented history of scams. Research any provider's track record before committing money.

What Do You Need to Mine Crypto?

Mining hardware has moved through three generations: ordinary CPUs, then GPUs, then today's mining rigs, built around ASICs (chips designed for one job, computing hashes as fast as possible).

ASICs vs. GPUs

An ASIC, short for application-specific integrated circuit, is purpose-built for one hashing algorithm. That makes it far faster and more efficient than general-purpose hardware, but also expensive and largely useless once that algorithm changes. GPU mining is more flexible: the same card can mine several proof-of-work coins and still be repurposed for gaming, which is where GPU mining mostly lives now that Bitcoin runs on ASICs.

How to Start Mining Crypto

If you still want to try it:

• Pick a coin still mined under proof of work, like Bitcoin.
• Buy hardware matching that coin's algorithm (an ASIC or a GPU mining rig).
• Join a mining pool rather than mining solo.
• Set up a crypto wallet to receive rewards, since pools pay out directly to a wallet address.
• Calculate your electricity cost per kilowatt-hour first. It's the step most new miners skip, and it's usually the one that decides whether the whole setup makes sense.

Is Crypto Mining Still Profitable in 2026?

Mining profitability comes down to a simple equation: block reward plus fees, minus electricity, hardware depreciation, and pool fees, and none of those numbers stay fixed. As more miners chase the same reward, the protocol raises mining difficulty automatically, lowering the payout per unit of hash rate even if the coin's price doesn't move. Bitcoin's block reward was cut to 3.125 BTC per block at the April 2024 halving, the most recent change to miners' per-block revenue and the baseline for any 2026 profitability calculation.

That's why the best crypto to mine keeps shifting quarter to quarter, and a profitable setup today can stop paying off within months. If the math only works because one variable happens to be in your favor right now, it probably won't hold for long. Results depend on your electricity rate, the coin's price and difficulty, and your hardware cost, so run your own setup through a crypto mining calculator, then check what you owe with a crypto tax calculator.

How Is Crypto Mining Taxed?

Here's the part most crypto mining guides skip: the IRS taxes mining rewards in two separate steps, at two different times.

The first tax event happens the moment you receive the coins. The IRS treats mined coins as ordinary income at their fair market value on the day you receive them. You owe tax even if you never sell and even if the price drops the next day. This is one of the taxable events unique to mining and staking: the tax bill arrives at receipt, not at sale.

That same fair market value becomes your cost basis going forward. When you sell, trade, or spend the coin, you calculate capital gains or losses by comparing the sale price to that basis. Get the basis wrong at receipt, and every calculation after that is wrong too.

There's a third wrinkle at scale: if the IRS considers your mining a trade or business rather than a hobby, net income may also owe self-employment tax on top of ordinary income tax. The distinction also affects deductions: hobby miners can't write off electricity or hardware costs against that income; only a mining operation run as a business can. A few GPUs in a spare room look different, tax-wise, from a warehouse of ASICs run as a business, and that distinction is worth a conversation with a tax professional.

The rules above describe US crypto tax rules at the federal level. Most states with an income tax also tax mining income, though a few have none. And if you're mining elsewhere, the income is still very likely taxable; details just vary by country, so check your local tax authority first.

Crypto Mining's Environmental Impact

Mining's energy use is real, and there's actual data behind it rather than a vague sense that "computers use a lot of power." Cambridge's Bitcoin Electricity Consumption Index tracks Bitcoin's annualized electricity use from real-time hash rate data, and the US Energy Information Administration published preliminary estimates that US crypto mining accounts for roughly 0.6%-2.3% of national electricity consumption.

Proof-of-stake networks sidestep almost all of this, since validators secure the network with staked capital instead of computing power.

How CoinTracking Handles Your Mining Income

Getting this right means knowing when you received each reward and what it was worth that day, across potentially thousands of transactions. That's not realistic to track by hand at any real scale.

CoinTracking can automatically track your crypto mining income as transactions are imported from your wallet or pool. Since 2012, CoinTracking has supported this kind of tax classification for over 2.2 million users across 400+ exchanges and wallets, generating the reports you need whether you mine as a hobby or a business.

Conclusion

Mining boils down to one trade: computing power in exchange for newly created coins, transaction fees, and a role in keeping a proof-of-work network honest. The tax timeline doesn't move, though: the IRS taxes every reward as ordinary income the moment you receive it, then taxes it again as a capital gain or loss once you sell. CoinTracking can automatically track your crypto mining income as it lands, so you always know what you owe.