Crypto Mining

Crypto mining is the work of validating transactions and creating new blocks on a proof-of-work blockchain, for which the network rewards the miner with newly issued cryptocurrency and transaction fees. Miners run specialized computers that compete to solve a computationally difficult puzzle; the first to solve it earns the right to add the next block and collect the reward. This is the mechanism that secures proof-of-work networks such as bitcoin, in contrast to proof-of-stake networks, which use staking instead. Mining rewards are treated as ordinary income for U.S. tax purposes at the moment they are received.

In a proof-of-work system, security comes from making it expensive to add a block. Miners' computers race to find a number that, combined with the block's data, produces a result meeting the network's difficulty target, which requires enormous numbers of guesses and therefore real electricity and hardware. The winner's block is accepted by the network, and the miner receives a block reward of new coins plus the fees from the transactions included. The network automatically adjusts the difficulty so that blocks arrive at a roughly steady pace no matter how much computing power joins, which means individual profitability falls as more miners compete.

The economics are dominated by two variables outside the miner's control: the price of the coin and the cost of electricity. Modern mining of a major coin is capital-intensive and concentrated among operations with cheap power and purpose-built machines, and a home miner competing for bitcoin rewards will usually spend more on electricity and equipment than the coins are worth. Hardware also becomes obsolete as newer, faster machines raise the network's difficulty.

The tax treatment comes from IRS Notice 2014-21, which established that cryptocurrency is property and that mining rewards are included in gross income at their fair market value on the date received. That value becomes the coins' cost basis, so a later sale is a separate capital gain or loss on the change in value. A further distinction turns on whether the mining is a hobby or a trade or business. If it rises to the level of a trade or business, the rewards are self-employment income, subject to self-employment tax, but the miner may then deduct ordinary and necessary business expenses such as electricity and equipment depreciation. A hobby miner reports the income without self-employment tax and generally cannot deduct those costs. The line between the two depends on the facts, including how regularly and businesslike the activity is conducted.

A miner runs hardware that repeatedly hashes block data looking for a valid solution. When the miner's machine, or a mining pool it belongs to, finds one, the block is broadcast, the network verifies it, and the reward is paid in the coin. Most individual miners join pools that combine computing power and split rewards proportionally, since solo mining a major coin is effectively a lottery.

A hypothetical shows the tax mechanics. Suppose Dana mines and receives coins worth $500 on the day they hit her wallet. Under Notice 2014-21, she has $500 of ordinary income that year, and the coins take a $500 basis. If her mining is a hobby, that $500 is ordinary income with no self-employment tax and no deduction for her electricity. If her mining is a trade or business, the $500 is self-employment income subject to self-employment tax, but she can deduct her related electricity, equipment depreciation, and other business expenses against it. Either way, if she later sells the coins for $620, the $120 increase over the $500 basis is a capital gain, taxed separately from the income she already reported.

Pros

• Earns newly issued coins and transaction fees for securing a proof-of-work network.
• Run as a genuine business, it allows deduction of electricity, equipment, and other operating expenses.
• Provides the security backbone that makes proof-of-work networks work.

Cons

• Capital- and energy-intensive; for individuals, costs often exceed the value of the coins earned.
• Rewards are taxed as ordinary income when received, regardless of whether you sell, and business mining adds self-employment tax.
• Rising network difficulty and obsolescence steadily erode a given machine's output.
• Returns depend on the coin's volatile price and on electricity costs, so profitability can vanish quickly.