Crypto Tax Reporting Under HMRC's New Digital Asset Framework

HMRC's Expanding Digital Asset Framework

HMRC has progressively developed its guidance on cryptoasset taxation since its initial 2018 policy paper, and the pace of development has accelerated through 2024-2025. The Cryptoassets Manual (CRYPTO) now covers most common transaction types in considerable detail. The Finance Act 2024 introduced specific provisions relating to the implementation of the OECD's Crypto-Asset Reporting Framework (CARF) in UK law, placing mandatory reporting obligations on UK crypto service providers from 2026.

HMRC has also significantly expanded its data-gathering capability. Through the requirement for UK exchanges to provide customer data under existing powers, and now through the forthcoming CARF regime, HMRC has substantially improved its ability to identify crypto-active taxpayers who have not reported their positions correctly. The era of crypto being an unreported tax grey area is over.

For corporate CFOs, the key questions are: how are the company's crypto holdings taxed, how is crypto-derived income treated, what are the specific challenges for DeFi and staking arrangements, and what new reporting obligations apply from 2026?

Corporate Tax Treatment: Intangible Assets vs Trading Stock

The fundamental classification of cryptoassets in a company's accounts depends on the nature of the business and how the assets are held. HMRC's guidance distinguishes between two primary treatments for corporate holders:

Treatment as Intangible Assets (Investment / Speculative Holders)

For a company that holds cryptoassets as an investment or for speculative purposes — not as part of a trading activity — the assets are most appropriately treated as intangible assets under HMRC's current guidance. Under this treatment:

• Gains and losses on disposal are treated as chargeable gains for corporation tax purposes, subject to the Corporation Tax on Chargeable Gains regime
• The Section 104 pooling rules apply: all holdings of the same cryptoasset are treated as a single pool with a pooled cost base, and disposals are matched against that pool on a weighted average cost basis
• Mark-to-market unrealised gains and losses are generally not immediately taxable; the tax charge arises on disposal
• However, companies applying IFRS or FRS 102 and marking crypto to fair value will recognise fair value movements through profit or loss, creating a potential temporary difference between accounting profit and taxable profit

Treatment as Trading Stock (Crypto Trading Businesses)

For a company whose ordinary business activity involves buying and selling cryptoassets — a crypto exchange, market maker, or proprietary trading desk — the cryptoassets held as inventory are trading stock. Under this treatment:

• Gains and losses are taxed as income, not chargeable gains, and form part of the company's trading profits for corporation tax purposes
• Mark-to-market accounting treatment directly drives taxable profits, with the standard rules for trading stock valuation applying (lower of cost and net realisable value at year-end)
• The distinction between trading and investment is not always clear, and HMRC applies the traditional "badges of trade" analysis to make the determination

The Section 104 Pooling Rule for Companies

The Section 104 pool is the mechanism by which HMRC computes the cost base for corporate disposals of cryptoassets. The rules are directly analogous to those that apply to company shareholdings, adapted for the fungible nature of most cryptoassets.

Under the pooling rules, every acquisition of a particular cryptoasset (say, Bitcoin) is added to a single pool. The pool has a total holding (number of units) and a total allowable cost (the sterling cost of all acquisitions). When units are disposed of, the allowable cost of the disposal is calculated as: (units disposed ÷ total pool holding) × total pool cost.

This means that cost-averaging is the mandatory method for corporate crypto disposals — FIFO (first in, first out) and specific identification methods are not permitted for the purposes of computing the taxable gain. This can create significant differences from the cost allocation method used for accounting purposes (where IFRS and FRS 102 permit various cost methodologies).

DeFi Income and Staking: The Emerging Framework

The tax treatment of DeFi (Decentralised Finance) activity and staking income is one of the most actively developing areas of HMRC's crypto guidance. The Finance Act 2024 introduced specific provisions addressing DeFi lending and staking, following a consultation that closed in 2023.

Staking Income

Where a company stakes cryptoassets and receives staking rewards, HMRC's current position is that the rewards are taxable as income at the point they are received, valued at the sterling equivalent of the reward on the date of receipt. For a company staking as part of a trading activity, this income forms part of trading profits. For a company staking investment holdings, the income is taxed as miscellaneous income.

A subsequent disposal of the received reward tokens generates a further chargeable gain (or trading profit) computed by reference to the acquisition cost of the reward at the date it was received (the value that was previously taxed as income) versus the disposal proceeds.

DeFi Lending and Borrowing

DeFi lending arrangements — where a company deposits cryptoassets into a liquidity pool or lending protocol and receives yield — are treated under the Finance Act 2024 provisions as follows: the transfer of assets into the DeFi arrangement is treated as a disposal for tax purposes if the company loses beneficial ownership of the asset; if the arrangement preserves beneficial ownership (which most lending protocols do not, legally), a disposal may not arise until the assets are withdrawn. The practical analysis of whether a given DeFi arrangement transfers beneficial ownership requires careful assessment of the specific protocol's legal structure.

Liquidity Pool Participation

Providing liquidity to automated market maker pools (such as Uniswap-style protocols) typically involves depositing two cryptoassets and receiving LP (liquidity provider) tokens in return. HMRC's position is that this is a disposal of the deposited assets and an acquisition of LP tokens at the same time. On withdrawal from the pool, the LP tokens are disposed of and the underlying assets are re-acquired. The fees earned as a liquidity provider are taxable as income. This creates two disposal events for each liquidity provision cycle, which has significant implications for pools where asset prices have moved materially.

VAT Treatment of Crypto Transactions

The VAT treatment of crypto transactions for businesses depends on the nature of the transaction. HMRC follows the framework established by the Court of Justice of the European Union's Hedqvist decision, which the UK retained post-Brexit:

• Exchange of cryptocurrency for fiat (or vice versa): exempt from VAT as a financial service, analogous to foreign exchange
• Exchange of one cryptocurrency for another: also treated as exempt from VAT
• Mining fees and transaction validation fees: outside the scope of VAT where the miner cannot identify the recipient of the service
• Goods or services purchased using cryptocurrency: subject to VAT in the normal way; the cryptocurrency is treated as consideration, valued in sterling at the exchange rate on the date of the supply
• Crypto exchange services (custodian or platform fees): these are fee-based financial services; the treatment depends on whether they are exempt or standard-rated financial services, which requires case-by-case analysis

CARF: The Crypto-Asset Reporting Framework

The OECD's Crypto-Asset Reporting Framework (CARF) is the most significant development in crypto tax compliance since HMRC's initial guidance in 2018. CARF creates a mandatory automatic information exchange regime for crypto transactions, analogous to the Common Reporting Standard (CRS) for traditional financial accounts.

Under CARF, which was implemented in UK law through the Finance Act 2024, Reporting Crypto-Asset Service Providers (RCASPs) — broadly, UK-registered crypto exchanges, brokers, and operators — are required to collect due diligence information on their customers and report annual transaction data to HMRC from 2026 (covering the 2025-2026 tax year as the first reporting period).

The data to be reported includes:

• Customer identity information (name, address, jurisdiction of residence, taxpayer identification number)
• Annual aggregate transaction data: crypto-to-fiat exchanges, crypto-to-crypto exchanges, and transfers of crypto out of the platform
• Aggregate values reported in sterling at the prevailing exchange rate

For UK crypto service providers, CARF creates the following compliance obligations:

1. Classify all customers as reportable or non-reportable based on jurisdiction of residence
2. Collect and verify due diligence information for all reportable customers, including obtaining self-certifications
3. Maintain transaction records in a format that enables annual CARF reporting
4. Submit the annual CARF report to HMRC by the prescribed deadline (expected to be May/June of the following calendar year)
5. Implement remediation procedures for customers who fail to provide adequate due diligence information within 60 days

Tax Treatment Summary by Transaction Type

Key Takeaways

• Corporate crypto holdings are treated as intangible assets (for investment holders) or trading stock (for trading businesses); the classification drives whether gains are chargeable or income and which pooling rules apply.
• The Section 104 pooling rule requires cost-averaging on disposals; FIFO and specific identification are not permitted for UK corporate tax purposes.
• Staking rewards are taxable as income at receipt, valued at sterling FMV; subsequent disposal of reward tokens generates a further chargeable event.
• DeFi lending and liquidity pool participation may trigger disposal events on deposit, not just on withdrawal; each protocol requires specific legal and tax analysis.
• VAT treatment of crypto-for-fiat exchange is exempt; goods and services paid for in crypto are subject to VAT in the normal way.
• CARF reporting applies from 2026: UK-registered crypto service providers must collect customer due diligence and report annual transaction data to HMRC.
• Transaction-level record-keeping, including sterling FMV at each transaction date, is essential and practically requires specialist crypto accounting software.