Crypto Mining Tax UK: How HMRC Taxes Mining Income

Crypto mining creates taxable income. Whether it’s hobby mining or a business affects how it’s taxed.

Hobby Mining vs Business Mining

Factor	Hobby Mining	Business Mining
Scale	Small (single rig)	Large (multiple rigs, warehouse)
Organisation	Casual, irregular	Structured, regular
Profit motive	Secondary	Primary
Tax treatment	Miscellaneous income	Trading income
Expenses	Not deductible	Deductible
National Insurance	No	Yes

Tax Treatment

Scenario	Tax
Hobby mining (occasional)	Miscellaneous income (SA100 Box 9)
Business mining (regular)	Trading income (SA103)
Mining as a company	Corporation Tax

What’s Taxable

Item	Tax Treatment
Mining rewards (coins)	Income at market value when received
Mining pool fees	Deductible (business) or not (hobby)
Hardware costs	Capital allowance (business)
Electricity costs	Deductible (business)
Sold mined coins	CGT on gain from mining value

Valuation of Mining Rewards

Step	Value
1	Note the market value when you receive the reward
2	Use a consistent exchange rate source
3	Sum all rewards in the tax year
4	Report as income (if over £1,000 allowance)

The £1,000 Trading Allowance

Mining Income	Requirement
Under £1,000/year	No need to report
Over £1,000/year	Report as miscellaneous income
Over £1,000 and regular	May be trading income

Business Mining Deductions

Expense	Deductible?
Mining hardware	Capital allowance
Electricity	Yes
Internet	Proportion of bill
Rent for space	Yes
Maintenance and repairs	Yes
Pool fees	Yes
Cooling equipment	Yes

Capital Allowances for Mining Hardware

Item	Allowance Type
GPU rigs	Annual Investment Allowance (100%)
ASIC miners	Annual Investment Allowance (100%)
Power supply units	Included with hardware
Cooling systems	Separate claim

Up to £1M can be claimed under the Annual Investment Allowance.

Selling Mined Coins

Event	Tax
Receive mined coin	Income at market value
Hold coin	No further tax
Sell coin	CGT on gain from income value
Swap coin	CGT on disposal

Record Keeping for Miners

Record	Why
Date each reward was received	Income timing
Market value at receipt	Income value
Transaction hash for each reward	Proof
Hardware purchase date and cost	Capital allowance (business)
Electricity bills	Deductible (business)
Pool fees paid	Deductible (business)

Bottom Line

Mining rewards are taxable income when received. Hobby miners with income under £1,000 don’t need to report. Business miners can deduct expenses and claim capital allowances on hardware. Sold mined coins trigger CGT on the gain from the income value. Keep detailed records of every reward. If mining is your main activity, HMRC will view it as a business — file SA103, not just SA100.