Crypto Asset Accounting Under UK GAAP: Practical Guidance for Finance Teams

Why UK GAAP Matters for Crypto

When the crypto accounting conversation happens in the press, it almost always references IFRS. The International Accounting Standards Board published its agenda decision on crypto assets in 2019, concluding they should generally be treated as intangible assets under IAS 38 or inventories under IAS 2. That framework matters for listed companies and subsidiaries of large groups. But the overwhelming majority of UK companies — including most of the fintech, Web3, and crypto-native businesses that a fractional CFO encounters day to day — prepare their accounts under FRS 102, the Financial Reporting Standard applicable in the UK and Republic of Ireland.

FRS 102 is UK GAAP. It is a principles-based standard derived from the IFRS for SMEs, but with important UK-specific modifications. Critically for our purposes, FRS 102 does not permit the revaluation of intangible assets to fair value unless there is an active market for the asset — and its impairment model works differently from IFRS in a way that can create significant asymmetric effects on reported profitability for companies holding crypto assets.

Understanding these differences is not an academic exercise. It affects how your balance sheet reads to investors, how your audit goes, and how much corporation tax you pay.

Classification Under FRS 102: The Two Routes

FRS 102 does not include any explicit guidance on crypto assets. In the absence of specific guidance, preparers must apply judgement to identify the most appropriate section of the standard to apply, considering the nature and purpose of the holding. The ICAEW's crypto accounting guidance, updated in 2024, sets out two primary routes.

Route 1: Section 18 Intangible Assets

For most companies holding crypto assets (Bitcoin, Ether, and similar non-fungible tokens held as investments or treasury assets), Section 18 of FRS 102 is the appropriate classification. Under Section 18, intangible assets are measured at cost less any accumulated amortisation and impairment losses.

The key features of the Section 18 model as applied to crypto assets are:

• Initial recognition at cost (the price paid, including any directly attributable transaction fees)
• No amortisation is recognised, because crypto assets have an indefinite useful economic life
• The asset is subject to impairment review at each reporting date, and impairment is recognised when the carrying amount exceeds the recoverable amount
• Revaluation upward is not permitted, because there is no active market in the FRS 102 sense for most crypto assets as currently interpreted

This last point deserves careful attention. FRS 102 Section 18 does permit revaluation of intangible assets to fair value — but only where fair value can be determined by reference to an active market. The FRS 102 definition of an active market requires that items traded within the market are homogeneous, willing buyers and sellers can normally be found at any time, and prices are available to the public. Whether crypto exchange markets meet this test is a matter of ongoing debate, but the current consensus in UK practice is that they do not meet the FRS 102 active market definition. The consequence is that the cost model applies, and upward revaluation is not available.

Route 2: Section 13 Inventories

Where a company's ordinary business activity is the buying and selling of crypto assets (a crypto trading business, a market-maker, or an exchange that holds inventory for sale), the assets may qualify as inventories under FRS 102 Section 13. In this case, the assets are measured at the lower of cost and net realisable value (NRV). If the NRV exceeds cost, the carrying value remains at cost. If NRV falls below cost, a write-down to NRV is recognised in profit or loss.

This is the same asymmetric model as Section 18 intangibles, but applied at the portfolio or lot level rather than on an individual asset basis. For commodity broker-dealers, FRS 102 permits an alternative of measuring inventories at fair value less costs to sell, which can allow upward movements to be recognised. However, applying this exception requires meeting the broker-dealer definition, which is not straightforward for most crypto businesses.

The Impairment-Only Model: A Critical Asymmetry

The most practically important feature of FRS 102 crypto accounting is the impairment-only model under Section 18. To understand why this matters, consider a concrete example.

This asymmetry has three practical consequences that finance teams must manage carefully.

First, reported profitability is depressed during market downturns even when the economic position is expected to be temporary. A company holding significant Bitcoin that experiences a price decline in one quarter will show an impairment loss in its management accounts and statutory accounts, even if the price has already recovered by the time the accounts are prepared.

Second, there is no mechanism to recognise the recovery above cost until disposal. If a company buys Bitcoin at £40,000, impairs to £30,000, and then the price rises to £70,000, the full £40,000 gain (from £30,000 carrying value to £70,000 disposal proceeds) will be recognised as a gain on disposal — but none of it is visible on the balance sheet in the interim period.

Third, comparability with companies reporting under IFRS is materially compromised. An IFRS-reporting company in the same position might be applying IAS 38 (same impairment model, same asymmetry) or might have adopted a fair value model through a different classification. Either way, the numbers on the face of the accounts will tell a different story.

Comparison with IFRS Treatment

Under IFRS, the position is broadly similar to FRS 102 for companies holding crypto assets as intangible assets under IAS 38. The IASB's 2019 agenda decision concluded that most crypto assets meet the IAS 38 definition and should be measured at cost less impairment, or at revalued amounts if an active market exists. Given the same debate about whether crypto exchange markets constitute active markets under IAS 38, most IFRS preparers also apply the cost model.

However, there is one important IFRS escape route that FRS 102 does not offer: IAS 2 Inventories permits commodity broker-dealers to measure certain inventories at fair value less costs to sell, with changes recognised in profit or loss. This is the model used by large crypto trading companies reporting under IFRS. For a company with a genuine broker-dealer business, this allows both upward and downward movements to flow through the P&L in real time.

Additionally, some IFRS preparers have argued that certain crypto assets qualify as financial assets under IFRS 9, which would allow fair value through profit or loss (FVTPL) measurement. This argument has not generally been accepted by the Big Four audit firms for standard crypto assets like Bitcoin and Ether, but it remains an area of debate for more complex instruments.

Tax Treatment Under UK GAAP

Corporation tax for UK companies generally follows the accounting treatment, subject to specific statutory adjustments. For crypto assets held under the Section 18 intangible asset model, the tax treatment aligns closely to the accounting.

Impairment charges recognised in the profit and loss account are generally deductible for corporation tax purposes. This means that if a company writes down its Bitcoin holding from £80,000 to £60,000, the £20,000 impairment creates a £20,000 tax deduction in the year of impairment, reducing the corporation tax liability at the applicable rate (25% for companies with profits above £250,000 from April 2023).

On disposal, the gain over the tax written-down value (which will be the impaired carrying amount) is taxable as a chargeable gain or a trading receipt, depending on whether the holding is a capital or trading asset. For most investment-type holdings in non-trading companies, HMRC treats disposal gains as chargeable gains subject to corporation tax at the main rate (there is no separate capital gains rate for companies). For companies where crypto is part of the trading activity, disposal proceeds are taxed as trading income.

The HMRC Cryptoassets Manual provides detailed guidance on the tax treatment of crypto assets for both individuals and companies. The key point for finance teams is that the accounting impairment model and the tax deductibility model are largely aligned under UK GAAP, which simplifies the tax computation relative to IFRS in some scenarios.

Disclosure Requirements Under FRS 102

FRS 102 Section 18 requires specific disclosures for intangible assets in the notes to the financial statements. For crypto assets, the following are the most relevant requirements.

The note must show a movement table covering: gross carrying amount at the start and end of the period, additions, disposals, and impairment charges recognised in the year. The note must also disclose the accounting policy applied (cost model, basis of impairment review, frequency of review), the carrying amount of each material class of intangible asset, and the amount of any impairment charges included in the profit and loss account.

Beyond the FRS 102 minimum, good practice for crypto holdings includes: the number of units held, the fair market value at the balance sheet date (even though it is not recognised on the balance sheet), the basis of the impairment review (which market price source is used, and how frequently the review is performed), and any concentration risk (e.g. if more than 50% of balance sheet assets are crypto holdings).

Auditors will scrutinise the impairment review process. They will want to see evidence of the market price at the balance sheet date, a comparison to the carrying value for each holding, and documented management judgement where the recoverable amount is close to the carrying value. Finance teams should maintain a crypto asset schedule updated at each reporting date as a matter of course.

Practical Implications for Finance Teams

The accounting model creates several operational requirements that finance teams need to build into their processes from the outset, rather than treating them as year-end tasks.

First, the impairment review must be performed at each reporting date — typically quarterly for management accounts and annually for statutory accounts, though more frequent reviews may be warranted for material holdings in volatile markets. The review should document the market price source (a reputable exchange or data provider such as CoinGecko or CoinMarketCap), the price at the relevant date, and the comparison to carrying value.

Second, the cost of acquisition must be tracked carefully. For straightforward purchases, this is the purchase price plus transaction fees. Where crypto is received as consideration for services, the cost is the fair value at the date of receipt. Where crypto is mined (for mining businesses), the cost is the directly attributable cost of mining activity. Each of these situations creates a different cost base and a different tax position.

Third, where a company holds multiple lots of the same crypto asset acquired at different prices, a consistent cost formula must be applied. FIFO (first in, first out) or weighted average cost are both acceptable under FRS 102; specific identification is also available for individually identifiable lots. The choice of cost formula should be documented in the accounting policy and applied consistently.

Key Takeaways

• Most UK companies report under FRS 102, not IFRS. The FRS 102 model for crypto assets is cost less impairment, with no upward revaluation permitted in the absence of an active market.
• The impairment-only model creates a structural asymmetry: falls below cost are recognised immediately; recoveries above cost are invisible until disposal.
• Crypto trading businesses may use Section 13 Inventories (lower of cost and NRV), but the broker-dealer fair value exception is not widely available under FRS 102.
• Under IFRS, the IAS 38 cost model is broadly equivalent, but IFRS IAS 2 offers a fair value through P&L route for genuine broker-dealers that has no FRS 102 equivalent.
• Corporation tax broadly follows the accounting under UK GAAP: impairment charges are generally deductible; disposal gains are taxable on the uplift over carrying value.
• Disclosure under FRS 102 requires a movement table, accounting policy note, and details of impairment charges. Best practice adds fair value disclosures even though they are not recognised on the balance sheet.
• Finance teams should maintain a crypto asset schedule updated at each reporting date and should treat the impairment review as a quarterly process, not an annual one.