Crypto Accounting for UK Limited Companies: The Complete HMRC Guide

Cryptocurrency creates unique accounting challenges for UK limited companies. Unlike personal crypto holdings, company-owned digital assets fall under different tax rules, with Corporation Tax applying instead of Capital Gains Tax. Getting this wrong can result in unexpected tax bills, penalties, or missed deductions.

This guide explains how HMRC treats cryptocurrency for UK limited companies, covering everything from basic purchases to complex DeFi transactions.

How HMRC Classifies Crypto for Companies

HMRC does not treat cryptocurrency as money or currency. For limited companies, crypto assets are classified based on the nature of your business activity.

Capital vs Trading Classification

The distinction between holding crypto as a capital asset versus trading it determines how profits are taxed.

For most limited companies: Crypto held as an investment or treasury reserve is treated as a capital asset. Gains and losses are calculated when you dispose of the asset.

For crypto trading businesses: If your company trades crypto as its main activity (buying and selling frequently for profit), the crypto is trading stock, and profits form part of your normal trading income.

The "Badges of Trade" Test

HMRC applies the badges of trade to determine if you are trading or investing:

• Frequency of transactions: Regular buying and selling suggests trading
• Length of ownership: Short holding periods suggest trading
• Profit motive: Buying specifically to resell at profit suggests trading
• Circumstances of disposal: Systematic sales pattern suggests trading
• Organisation: Sophisticated trading infrastructure suggests trading

Important: A company that buys Bitcoin to hold long-term as treasury diversification is investing. A company that actively trades crypto pairs daily is trading.

Corporation Tax on Crypto Gains

When your company disposes of cryptocurrency held as a capital asset, any gain is subject to Corporation Tax at 19% (profits up to 50,000 pounds) or 25% (profits over 250,000 pounds).

What Counts as a Disposal

A disposal occurs when you:

• Sell crypto for pounds or other fiat currency
• Exchange one cryptocurrency for another
• Use crypto to pay for goods or services
• Gift crypto to a third party
• Transfer crypto for no consideration (in some cases)

Note: Transferring crypto between your own company wallets is not a disposal.

Calculating the Gain

Matching Rules

Unlike individuals who use Section 104 pooling with same-day and bed-and-breakfast rules, companies use standard share pooling rules for crypto:

Same-day rule: If you sell and buy the same crypto on the same day, match the disposal with the same-day acquisition.

Section 104 pool: All acquisitions of the same crypto are pooled together. The cost of each unit is the average cost of all units in the pool.

Worked Example

Your company holds Bitcoin acquired as follows:

In June 2025, the company sells 1.5 BTC for 60,000 pounds.

Corporation Tax at 25%: 5,000 pounds

Recording Crypto Transactions

Accurate record-keeping is essential. HMRC requires companies to maintain records for at least 6 years.

What to Record for Each Transaction

Valuation at Transaction Time

Use a consistent method to determine GBP value:

• Exchange rate from the platform used
• Average of multiple exchange rates at the time
• Price from a reputable data provider (CoinGecko, CoinMarketCap)

Key point: Document your valuation methodology and apply it consistently.

Accounting Treatment Under UK GAAP

For companies preparing accounts under FRS 102:

Most SMEs: Treat crypto as a current asset investment, revaluing at fair value each year-end with gains/losses recognised in the P&L.

Crypto as Payment for Services

When your company receives cryptocurrency as payment for goods or services, this creates a taxable event.

Tax Treatment

Worked Example

Your consultancy company receives 0.5 ETH (worth 1,000 pounds) as payment for services. Six months later, you convert the ETH to pounds when it's worth 1,500 pounds.

Total taxable: 1,500 pounds (1,000 trading income + 500 chargeable gain)

VAT Considerations

Services paid for in crypto follow normal VAT rules:

• If the underlying service is VATable, charge VAT based on the GBP value at the time
• The crypto itself is not subject to VAT
• Record the VAT amount in your VAT return as normal

Crypto Mining and Staking Income

Mining and staking create income that must be recognised for Corporation Tax purposes.

Mining Income

When your company mines cryptocurrency:

Mining as a trade: If your company mines crypto as a business activity, the income and expenses form part of your trading profits. Equipment purchases may qualify for Annual Investment Allowance (up to 1 million pounds).

Staking Rewards

Staking rewards are treated similarly:

Validator Income

Running a validator node (e.g., Ethereum) generates income that is taxable when received. The associated costs (hardware, electricity, internet) are deductible business expenses.

DeFi and Yield Farming

Decentralised finance activities create complex tax situations. The key principle: identify each taxable event.

Liquidity Provision

When your company provides liquidity to a DEX:

Important: HMRC has not provided definitive guidance on DeFi. Take a consistent, defensible position and document your reasoning.

Yield Farming Rewards

Rewards from yield farming protocols:

Lending and Borrowing

NFT Taxation for Companies

Non-fungible tokens receive similar treatment to other crypto assets.

Creating and Selling NFTs

If your company creates and sells NFTs:

Purchasing NFTs

If your company buys NFTs as investments:

NFTs Used in Business

NFTs used as business assets (e.g., profile pictures for branding, access passes):

Record Keeping Requirements

HMRC expects comprehensive records for crypto activities.

Minimum Records Required

Best Practices

• Export transaction history from exchanges regularly (exchanges shut down or purge data)
• Maintain on-chain records (transaction hashes) for verification
• Reconcile exchange records with blockchain records
• Use crypto accounting software for complex portfolios
• Document your accounting policies and methodologies
• Keep evidence of fair value calculations

What Happens Without Records

If you cannot prove acquisition costs, HMRC may:

• Treat entire proceeds as gain
• Apply estimated figures that may not favour you
• Open an enquiry into your tax affairs

Common Mistakes to Avoid

1. Ignoring Crypto-to-Crypto Exchanges

Mistake: Only reporting when converting to pounds.

Reality: Every crypto-to-crypto exchange is a disposal. Swapping ETH for USDC creates a taxable event.

2. Missing Staking and Rewards Income

Mistake: Not reporting staking rewards or airdrops.

Reality: These are taxable income when received, even if you do not convert to fiat.

3. Using Personal Wallets for Company Crypto

Mistake: Mixing personal and company holdings.

Reality: Company assets must be clearly separated. Mixing creates accounting nightmares and potential benefit-in-kind issues.

4. Forgetting Transaction Fees

Mistake: Not including gas fees and exchange fees in cost basis.

Reality: Transaction fees are allowable costs that increase your base cost (reducing future gains).

5. Wrong Valuation Method

Mistake: Using inconsistent pricing sources.

Reality: Pick a valuation method and apply it consistently across all transactions.

6. Missing DeFi Events

Mistake: Assuming DeFi has no tax implications until cash out.

Reality: Many DeFi interactions create taxable events (swaps, LP deposits, reward claims).

7. Ignoring Losses

Mistake: Not claiming allowable losses.

Reality: Losses can offset gains. Document them properly and claim them.

8. Treating Crypto as Currency

Mistake: Recording crypto income and expenses at historic rates.

Reality: Crypto is an asset, not currency. Each acquisition and disposal must be tracked.

Frequently Asked Questions

Does my limited company pay Capital Gains Tax on crypto?

No. Limited companies do not pay Capital Gains Tax. Instead, gains on crypto assets are included in your company's profits and subject to Corporation Tax (19-25%). The calculation method is similar to CGT, but the tax applied is Corporation Tax.

When do I need to report crypto on my Corporation Tax return?

Report crypto gains and losses in the accounting period when the disposal occurs. If your company year-end is 31 March 2026 and you sell crypto in January 2026, that gain appears in your CT600 for the year ending 31 March 2026.

Can my company offset crypto losses against other profits?

Yes. If your company makes a loss on crypto held as a capital asset, this can be offset against other chargeable gains in the same period. Trading losses (if crypto is trading stock) can offset other trading profits. Losses cannot create a tax refund but can be carried forward.

How do I handle crypto received as payment from overseas clients?

The treatment is the same as domestic payments. Record the GBP value at receipt as trading income. The fact the payer is overseas does not change the tax treatment for your UK company.

Is there VAT on cryptocurrency transactions?

Exchanging cryptocurrency for fiat currency or other crypto is exempt from VAT under HMRC guidance (following EU case law). However, services related to crypto (consultancy, mining services for others) follow normal VAT rules.

What if I cannot find records for old crypto purchases?

Make best efforts to reconstruct records using exchange history, bank statements, blockchain explorers, and email confirmations. Document your methodology. If acquisition cost genuinely cannot be established, you may need to use a nil cost basis (making all proceeds taxable) or a reasonable estimate with supporting rationale.

How do I account for hard forks and airdrops?

Hard forks: The new coins typically have a nil acquisition cost. The entire value at disposal is the gain.

Airdrops: If received in exchange for something (providing liquidity, holding tokens), taxable as income at receipt. Unsolicited airdrops may have nil cost basis.

Do I need separate wallets for company crypto?

While not legally required, it is strongly recommended. Keeping company crypto in wallets controlled by the company (not personal wallets) provides clean audit trails and avoids potential benefit-in-kind complications.

Can my company use the 6,000 pound CGT allowance?

No. The CGT annual exempt amount is for individuals only. Companies do not receive any exemption on chargeable gains - all gains are taxable.

What records should I keep for an HMRC enquiry?

Keep transaction records showing date, type, quantity, GBP value, counterparty/platform, and transaction ID. Also maintain your calculation workings showing how you arrived at gains and losses, your accounting policy for crypto, and bank statements showing fiat movements.

How AccountsOS Handles Crypto Accounting

AccountsOS makes tracking cryptocurrency transactions straightforward for UK limited companies.

Automatic transaction categorisation: When you import crypto transactions, AccountsOS recognises the asset type and applies appropriate accounting treatment, distinguishing between purchases, sales, exchanges, and income.

Real-time GBP valuations: Crypto transactions are automatically valued in GBP at the transaction date, building your cost basis records as you go rather than reconstructing them at year-end.

Pool calculations: The Section 104 pool is maintained automatically, calculating your average cost basis as you acquire and dispose of each cryptocurrency.

Gain and loss tracking: See your unrealised and realised gains across your crypto portfolio, with instant visibility into your tax position.

DeFi support: Record staking rewards, LP deposits and withdrawals, and yield farming income with proper categorisation.

Natural language queries: Ask questions like "What is my Bitcoin cost basis?" or "Show me all crypto transactions this quarter" and get instant answers.

Audit-ready records: Export complete transaction histories with valuations, calculations, and supporting documentation for your accountant or HMRC enquiry.

Stop wrestling with spreadsheets and CSV exports. See how AccountsOS works and take control of your company's crypto accounting.

This article reflects UK tax treatment of cryptocurrency for limited companies as of January 2026. HMRC guidance on crypto continues to evolve, particularly around DeFi. For significant crypto holdings or complex transactions, consider taking specialist advice. Always verify current rules with HMRC or a qualified tax adviser for advice specific to your situation.