Compare hobby and business mining tax treatment.
Hobby total tax
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No deductions allowed.
Business total tax
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Deductions + SE tax.
Better classification
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Hobby or business changes everything
The IRS has treated mined crypto as ordinary income at fair market value when received since Notice 2014-21. What that notice does not settle is how you report the expenses, and that hinges on one question: are you mining as a hobby or running a trade or business. The answer flips your tax outcome. A hobby miner reports the rewards as other income on Schedule 1 and, since the Tax Cuts and Jobs Act suspended miscellaneous itemized deductions, gets to deduct nothing for electricity or hardware. A business miner files Schedule C, deducts the real costs of mining, but then owes self-employment tax on the net profit. This tool runs both treatments side by side so you can see which leaves you with less total tax.
Here is how the calculator models each path. The hobby figure is simply your rewards times your marginal income tax rate, with no deductions. The business figure first subtracts electricity and equipment depreciation from rewards to get net profit, computes self-employment tax on 92.35% of that net at 15.3%, lets you deduct half the self-employment tax against income, then taxes the remainder at your marginal rate and adds the full self-employment tax back. It is the genuine Schedule C plus Schedule SE sequence in miniature.
A home rig earning $40,000 a year
Take a miner with $40,000 of rewards at fair market value, $8,000 of electricity, $3,000 of equipment depreciation, and a 22% marginal rate. As a hobby, there are no deductions, so the tax is 22% of $40,000, which is $8,800. As a business, net profit is $40,000 minus $11,000 of costs, or $29,000. Self-employment tax runs $29,000 times 0.9235 times 15.3%, about $4,098. Deducting half of that leaves $26,951 of taxable profit, taxed at 22% for roughly $5,929, and adding back the full self-employment tax gives a business total of about $10,027. Here the hobby treatment actually wins by roughly $1,200, because at this scale the deductions do not outweigh the self-employment tax.
| Step | Hobby | Business |
|---|---|---|
| Rewards (FMV at receipt) | $40,000 | $40,000 |
| Less electricity + depreciation | not allowed | $11,000 |
| Net profit | $40,000 | $29,000 |
| Self-employment tax | $0 | $4,098 |
| Income tax at 22% | $8,800 | $5,929 |
| Total tax | $8,800 | $10,027 |
When scale flips the answer
Change the inputs and the winner changes. Crank electricity and depreciation up relative to rewards, the way a serious operation with racks of hardware and a big power bill would, and the deductions start to dwarf the self-employment tax cost, making business treatment the cheaper path. The small home miner with one rig often finds hobby treatment is fine, because the lost deductions are modest and avoiding self-employment tax matters more. You do not get to freely pick, though. Whether you are a business is a facts-and-circumstances test built around profit motive, regularity, and the time and effort you put in. Calling yourself a business purely to grab deductions invites an audit if the activity looks like a hobby.
The second tax bill people overlook
This tool covers the income side, the tax due when coins hit your wallet. It does not cover what happens when you sell them. The value you reported as income becomes your cost basis, and selling later triggers capital gain or loss on the change since receipt. Mine a coin worth $1,000 today and sell it for $1,400 next year, and you have $1,000 of ordinary income now plus a $400 capital gain at sale. Business miners also have the option to deduct equipment under Section 179 or bonus depreciation instead of straight-line depreciation, which can front-load the writeoff. This calculator is for anyone with mining rewards trying to decide how to report them, but the classification question is worth a conversation with a tax pro once the dollars get real.
When exactly do I owe income tax on mined coins?
At the moment you gain control of the reward, valued at its fair market price that day. That income tax is owed whether or not you ever sell. Many miners are blindsided because they reinvest or hold and forget they already triggered a taxable event at receipt. Track the value on the day each reward lands.
Can I deduct the cost of my mining rig?
Only if you mine as a business and report on Schedule C. Then the hardware is a depreciable asset, and you may use regular depreciation, Section 179 expensing, or bonus depreciation. Hobby miners cannot deduct equipment at all under current law, which is the single biggest reason the hobby and business outcomes diverge.