Crypto loans are a cornerstone of the digital asset economy, but recent legal interpretations in the United Kingdom have unveiled a significant tax complication. While lenders expect repayment in crypto, UK courts may order settlements in sterling (£) if a borrower defaults. This forced conversion from crypto to fiat isn't just a legal nuisance; it's a distinct taxable event that can trigger unexpected Capital Gains Tax (CGT) for the lender, even if they never wanted to sell.

Crypto is Property, But Repayment Isn't Guaranteed: The UK Legal View

Under English law, the path to classifying cryptoassets as "property" has been gradual but decisive. The UK Jurisdiction Taskforce's 2019 Legal Statement provided a foundational argument that cryptoassets could be treated as property, a view since supported by various court rulings. As noted in analysis by legal experts, this classification is crucial because it allows for proprietary remedies like freezing orders in cases of fraud or dispute. Source: weightmans.com

However, this legal clarity has a complex flip side when it comes to loans. There's a critical distinction between a traditional fiat debt and a crypto-denominated obligation. As highlighted in a briefing by Clifford Chance, English law remains somewhat unsettled on whether a failure to repay a crypto loan constitutes a "debt" in the traditional sense or a claim for damages. Source: cliffordchance.com

This ambiguity has profound consequences. If a borrower defaults on a 1 BTC loan, a court may not compel them to return 1 BTC. Instead, a judge might order the borrower to pay the lender the sterling equivalent of 1 BTC at the time of the default or judgment. This judicial preference for fiat-based damages protects creditors from the volatility of the underlying asset but creates a major tax headache for the lender.

Further legislative efforts, such as the Property (Digital Assets etc.) Act 2025, aim to formally codify the status of digital assets in law, which could bring more certainty but is unlikely to change this fundamental approach to calculating damages in civil disputes.

The Repayment Dilemma: In-Kind Crypto vs. Fiat Currency

When a crypto loan is made, both lender and borrower typically envision a simple, symmetrical transaction: the crypto is lent, and the same type and amount of crypto is returned, plus interest. This is known as an "in-kind" repayment. However, in a default scenario that ends up in court, a fiat settlement becomes a real possibility.

This creates two divergent paths for the lender, each with vastly different tax implications.

Settlement Type	Description	Lender Receives	Primary Tax Implication
In-Kind Repayment	The borrower successfully repays the loan with the same type of cryptoasset that was borrowed (e.g., repays 1 BTC for a 1 BTC loan).	Cryptocurrency	The lender disposes of their "right to repayment" in exchange for crypto. The gain/loss is based on the change in the crypto's value during the loan term.
Forced Fiat Settlement	The borrower defaults, and a court orders them to pay the lender the sterling value of the crypto at a specific point in time (e.g., date of default).	Sterling (Cash)	The lender disposes of their "right to repayment" in exchange for cash. The gain is the cash amount minus the sterling value of the crypto when the loan was first made.

The core issue is that the lender, who intended to hold a cryptoasset, is forced into a cash settlement. From a tax perspective, this is treated as if they sold their position for sterling, crystallizing a capital gain they never planned to realize.

How Forced Fiat Repayments Trigger a UK Capital Gains Tax Event

His Majesty's Revenue and Customs (HMRC) has provided detailed guidance on the taxation of Decentralised Finance (DeFi) lending and staking, which applies equally to centralized crypto loans. The rules reveal a multi-stage process where tax events can occur at both the start and end of a loan's lifecycle.

The Lender's Tax Journey

For the lender, a single loan can trigger two separate CGT disposals.

Disposal 1: Making the Loan. According to HMRC's Cryptoassets Manual (CRYPTO61620), if the loan terms transfer the "beneficial ownership" of the tokens to the borrower, the lender has made a disposal of their crypto. The consideration for this disposal is not cash, but rather the right to receive a future quantity of tokens. The value of this right is the sterling market value of the crypto at the time the loan is made.
Disposal 2: Satisfying the Loan. When the loan is repaid, the lender disposes of the right they acquired in step one. The proceeds from this second disposal are the assets they receive in return—either the crypto repaid by the borrower or the cash awarded by a court. As stated in CRYPTO61650, the tokens (or cash) received are a "capital sum derived from that right," resulting in a disposal under section 22(1) of the Taxation of Chargeable Gains Act (TCGA) 1992. Source: gov.uk

The Tax Trap: When a court forces a fiat settlement, the proceeds for Disposal 2 are in sterling. The lender calculates their gain by subtracting the acquisition cost of the right (the sterling value of the crypto when the loan was made) from the cash received. If the crypto's price increased during the loan term, this results in a taxable capital gain.

The Borrower's Tax Position

The borrower also faces tax consequences, though they are more straightforward.

Acquisition: When borrowing tokens, the borrower makes an acquisition. Per CRYPTO61630, the acquisition cost is the value of their obligation to repay, which is the sterling market value of the tokens at that time. Source: gov.uk
Disposal: When the borrower satisfies the loan by returning the crypto, they are making a disposal of those tokens. Their capital gain or loss is the difference between the market value at repayment and their acquisition cost from step one.

A Practical Example: Calculating Your Gain on a Defaulted Crypto Loan

Let's walk through a scenario to see how this plays out.

Loan Origination (1 February 2025): Alice lends Bob 2 ETH. The market price of ETH is £2,000 per token. Alice's original cost basis for these 2 ETH was £500 per token (£1,000 total).
Default & Judgment (1 February 2026): Bob fails to repay the loan. The price of ETH has risen to £3,500. Alice takes Bob to court, and the court orders Bob to pay her the sterling value of the 2 ETH on the date of the default: 2 x £3,500 = £7,000.

Here is Alice's (the lender's) CGT calculation for the 2025/26 and 2026/27 tax years.

Tax Event 1: Making the Loan (2025/26 Tax Year)

Disposal: Alice disposes of 2 ETH.
Proceeds: The value of her right to receive 2 ETH in the future is 2 x £2,000 = £4,000.
Acquisition Cost: Her original basis in the ETH was £1,000.
Capital Gain: £4,000 (Proceeds) - £1,000 (Cost) = £3,000 Gain.

This £3,000 gain is reportable on Alice's 2025/26 Self Assessment tax return.

Tax Event 2: Forced Fiat Settlement (2026/27 Tax Year)

Disposal: Alice disposes of her right to receive 2 ETH.
Proceeds: The court awards her £7,000 in cash.
Acquisition Cost: The cost of acquiring the right was its value at the time of the loan, which was £4,000.
Capital Gain: £7,000 (Proceeds) - £4,000 (Cost) = £3,000 Gain.

This second £3,000 gain is reportable on her 2026/27 tax return.

In total, Alice has a £6,000 capital gain spread across two tax years from a single defaulted loan. After using her annual CGT exempt amount (currently £3,000 for the 2025/26 tax year), she would owe tax on the remainder at her applicable rate (10% for basic-rate taxpayers or 20% for higher-rate taxpayers on crypto gains).

Proactive Steps: Mitigating Tax Risk with Clear Contracts and Records

While you can't control a court's decision, you can take steps to manage the risks and ensure you are prepared for any tax outcome.

Draft Clear Loan Agreements: Your loan contract should be explicit about what constitutes a default and the preferred method of settlement. While not binding on a court, a well-drafted clause specifying repayment in-kind or a clear formula for calculating damages can provide clarity and strengthen your position.
Maintain Meticulous Records: For every loan you make, you must record the date, the type and amount of crypto, and its precise sterling market value at the time of the transaction. You must do the same for the settlement. This data is non-negotiable for accurate CGT calculations.
Use a Crypto Tax Platform: Manually tracking these multi-step events is prone to error. A dedicated crypto tax software solution can be invaluable. For instance, platforms like dTax are designed to handle complex DeFi and lending transactions by automatically identifying disposals, calculating the cost basis of both the original asset and any subsequent rights, and accurately computing gains or losses for each taxable event. This high degree of automation flags transactions for review and significantly reduces the burden of manual reconciliation.

By combining clear legal agreements with robust record-keeping, you can navigate the complexities of crypto lending and avoid being caught off guard by a hidden tax bill.

Frequently Asked Questions

What happens if the crypto's value goes down before the fiat settlement?

If the crypto's value decreases between the loan origination and the fiat settlement, the lender would realize a capital loss on the disposal of their "right to repayment." Using the example above, if ETH dropped to £1,500, the court might award Alice only £3,000. Her acquisition cost for the right was £4,000, so she would have a £1,000 capital loss (£3,000 - £4,000), which could be used to offset other capital gains in that tax year.

Does this tax treatment apply to lending on DeFi platforms?

Yes. HMRC's guidance is explicitly aimed at Decentralised Finance but applies to any crypto lending scenario where beneficial ownership of the asset is transferred. The key factor is whether the protocol or borrower has the freedom to deal with the tokens as their own. If they do, the lender is considered to have made a disposal at the point of lending/staking.

How do I report these gains to HMRC?

You must report capital gains on your annual Self Assessment tax return, specifically on the SA108 "Capital Gains Summary" pages. You will need to provide details of each disposal, including the proceeds, allowable costs, and the resulting gain or loss. The tax year in the UK runs from 6 April to 5 April.

This content is for informational purposes only and does not constitute tax, legal, or financial advice. Consult a qualified tax professional for your specific situation.

Crypto lending involves complex, multi-stage transactions that can be challenging to track for tax purposes. To ensure your records are accurate and you're prepared for any tax outcome, consider using a specialized tool. Start automating your crypto taxes with dTax.