Cryptocurrency earnings are taxed in the UK as either income or capital gains depending on whether your activity counts as trading or as investing. Side-hustlers must examine the nature, frequency and intention behind each transaction to decide the correct treatment before completing their self-assessment tax return.
HMRC expects accurate records and timely reporting; the rules evolve so always verify the latest guidance on GOV.UK. This guide outlines practical ways to classify activity, keep compliant records and avoid common pitfalls when mixing crypto with an e-commerce side hustle.
Income tax or capital gains: how HMRC decides
HMRC looks at the 'badges of trade' to decide whether cryptocurrency activity amounts to trading. Frequent buying and selling, short holding periods, use of borrowed funds, systematic research or treating crypto as a business all point toward trading income. Occasional purchases held for the long term are usually treated as capital assets.
If classified as trading, profits form part of your self-assessment income after allowable expenses. Capital gains treatment applies to disposals of assets held as investments. Because thresholds and rates change, check the current rules on GOV.UK each tax year. Side-hustlers running an e-commerce store alongside crypto must separate the two activities clearly in their records.
Tax treatment of cryptocurrency trading
When your activity is deemed trading, each profitable sale is taxed as income. You may deduct directly related costs such as transaction fees, exchange charges and electricity used for mining if applicable. Keep evidence of every trade, including timestamps, amounts, cost basis and fees.
Use spreadsheets or accounting software that supports crypto imports. Record the sterling value at the time of each transaction using a consistent reputable exchange rate source. If you trade across multiple platforms, consolidate records monthly. This helps when completing the self-employment pages of your self-assessment return.
Practical tip: label each wallet or exchange account clearly and note the purpose (trading versus long-term holding) from the outset. Revisit the label only if your actual behaviour changes significantly.
Staking rewards and how they are taxed
Staking rewards are generally treated as miscellaneous income when received. The sterling market value at the exact moment the coins are credited to your wallet becomes taxable income. Later disposal of those coins may trigger a capital gain or loss.
Maintain a log showing the date, amount of reward, fair market value in pounds, and the platform used. Some platforms provide annual summaries; download and verify them against your own records. If staking forms a significant and organised part of your side hustle, HMRC may view the entire staking operation as trading income. Document your level of involvement to support your chosen treatment.
Allowable expenses can include reasonable costs of running the staking node or validator if you can demonstrate they are wholly for generating the rewards.
NFTs: income versus capital gains
Creating and selling NFTs as part of a regular business activity is usually taxed as trading income. Costs of creation, gas fees, platform commissions and marketing can be deducted. If you buy NFTs with the primary aim of reselling at a profit in the short term, this may also be treated as trading.
One-off sales of NFTs you created as a hobby or held as collectibles are more likely to fall under capital gains. The cost of acquisition, improvement and disposal fees can be deducted from the sale proceeds to calculate the gain. Keep original minting receipts, wallet addresses and sales confirmations.
Because NFT activity can blur between personal use, investment and business, write a short note for your records explaining your intention at the time of each major transaction. This helps if HMRC makes enquiries later.
Capital gains on crypto disposals and reporting rules
Every disposal of cryptocurrency, including selling for sterling, exchanging one crypto for another, using crypto to pay for goods or services, or gifting, can create a capital gains tax event. You must calculate the gain or loss using an acceptable method such as share matching rules or FIFO.
Record the acquisition cost, date, sterling value and the disposal details for every transaction. Free tools and spreadsheets exist to help track pooled costs; choose one and stick with it. Report total gains on the capital gains pages of your self-assessment tax return if they exceed the annual threshold that applies for that year.
Losses can be carried forward to offset future gains. Maintain separate capital gains worksheets and retain them for at least six years. If your total disposals are below the current reporting threshold you may not need to report, but keeping records remains advisable.
Record-keeping and self-assessment practical steps
Good records are the foundation of compliance. Use a dedicated spreadsheet with columns for date, transaction type (buy, sell, stake, mint, transfer), asset, quantity, sterling value, fees, purpose and running cost basis. Export CSV files from every exchange and wallet at the end of each tax month and reconcile them.
- Choose one consistent source for GBP exchange rates and note it in your records.
- Separate personal and business wallets if you also run an e-commerce side hustle.
- Download and store platform statements as PDFs with clear filenames including the year.
- Reconcile your records against bank statements to prove cash movements.
- Keep notes on any large or unusual transactions in case HMRC asks for explanations.
Complete the self-assessment by 31 January following the tax year if filing online. Late submission or payment attracts penalties that increase over time. If your crypto activity grows, consider whether you should register as self-employed or incorporate; the decision depends on turnover, profit level and future plans. Always refer to the latest GOV.UK guidance before deciding.
Common pitfalls and how to avoid them
Many side-hustlers underestimate the volume of records needed and only discover gaps when preparing their return. Start tracking immediately rather than reconstructing history. Another error is mixing personal spending with business transactions in the same wallet; this complicates allocation of gains and expenses.
Dealing in decentralised finance (DeFi) adds complexity because transactions may involve multiple smart-contract steps that all count as disposals. Document each step with transaction hashes. Finally, remember thatairdrops and forks can create taxable income at receipt; record their sterling value on the day they become yours.
Review your records quarterly so the annual self-assessment becomes a simple summary rather than a last-minute scramble. If your combined e-commerce and crypto income is significant, consider professional advice on whether incorporation would simplify compliance, but note that rules and thresholds change regularly.
Frequently asked questions
Do I need to declare crypto if I only hold and do not sell?
Holding alone does not create a tax event. However, if you receive staking rewards, airdrops or forked coins their sterling value is usually taxable as income when received. Disposals later will trigger capital gains calculations. Keep records from the moment you acquire any crypto.
How do I calculate my cost basis for crypto I bought at different times?
HMRC generally requires the share matching rules or an acceptable consistent method such as FIFO. Track every purchase with date, quantity and sterling cost. Pool identical assets and calculate the average cost per unit as new purchases are added. Maintain clear worksheets to support your figures.
Can I offset crypto losses against my e-commerce profits?
Trading losses can usually be offset against other trading income in the same year or carried forward. Capital losses can only be offset against capital gains, not against trading profits. Correct classification at the outset determines which offset rules apply.
What records should I keep for NFT transactions?
Retain minting receipts, gas fee records, platform sales statements, wallet addresses and the sterling values at acquisition and disposal. A short note on whether the NFT was created as part of a business or as a personal project helps justify your tax treatment if questioned.
When should a side-hustler consider registering as self-employed for crypto activity?
If your crypto buying and selling or staking is regular, organised and intended to generate profit, you may need to register for self-assessment. Compare the volume and frequency against HMRC’s badges of trade. Registration is free but brings quarterly reporting obligations in some cases.
Related reading: When and how should UK startups register for VAT?, How does VAT work on overseas imports for UK ecommerce?, What is the self assessment tax return deadline for side hustlers?. Browse all tax & finance guides or apply to Loomworks.