英国遗产税对Web3域名的资产属性：区块链域名的遗产处理

When a UK resident holds a Web3 domain—such as an Ethereum Name Service (ENS) domain ending in .eth or a Unstoppable Domain—HMRC’s position on whether that asset falls within the chargeable estate for Inheritance Tax (IHT) purposes remains unsettled. As of the 2023/24 tax year, HMRC collected £7.1 billion in IHT receipts, a figure that has risen by 71% since the 2016/17 tax year, according to the Office for Budget Responsibility (OBR, 2024, Fiscal Risks Report). At the same time, the UK’s blockchain economy has grown rapidly, with the Financial Conduct Authority (FCA, 2023, Cryptoasset Consumer Research) estimating that approximately 10% of UK adults—roughly 5 million people—now hold some form of cryptoasset, including non-fungible tokens (NFTs) and blockchain-based domain names. This intersection of a maturing digital asset class and a rigidly statute-based IHT regime creates a pressing practical problem: how should executors value, locate, and transfer a Web3 domain that has no physical situs, no central registry, and no clear legal characterisation under the Inheritance Tax Act 1984? The answer is not yet settled in case law, but the principles governing intangible property, situs, and the “property” definition under s.272 IHTA 1984 provide a workable framework—provided practitioners understand the technical and administrative hurdles.

The Legal Character of a Web3 Domain Under IHTA 1984

Property for IHT purposes is defined broadly under s.272 of the Inheritance Tax Act 1984 as “all property wherever situated.” This includes choses in action, equitable interests, and intangible assets. A Web3 domain—typically a smart contract-based token on a blockchain (e.g., ENS on Ethereum)—is a digital asset that confers a right to resolve a human-readable name to a blockchain address. HMRC’s internal manual on cryptoassets (CRYPTO20000, last updated April 2023) confirms that tokens capable of being owned and transferred are generally treated as property for capital gains and IHT purposes. However, the manual does not specifically address Web3 domains, leaving a gap.

HMRC’s Existing Guidance on Cryptoassets

The CRYPTO20000 series states that exchange tokens (e.g., Bitcoin) are treated as “property” under English law following the AA v Persons Unknown [2019] EWHC 3556 (Comm) ruling. That case confirmed that cryptoassets have the legal attributes of property—identifiable, capable of being owned, and having value. By extension, a Web3 domain that exists as an ERC-721 or ERC-1155 token likely qualifies as property. The critical distinction is that a Web3 domain is not merely a cryptoasset; it also functions as a naming right within a decentralised system, which may affect its valuation and situs.

Situs of a Web3 Domain

For IHT purposes, situs determines which assets fall within the UK estate and whether double taxation relief applies. Under general law, intangible property is situated where the debtor resides or where the property can be enforced (Duke of Marlborough v AG [1909] AC 165). For a Web3 domain, the “debtor” is the blockchain protocol itself—a decentralised network with no physical situs. HMRC’s approach to cryptoassets (CRYPTO22100) suggests situs is the residence of the beneficial owner. This creates a risk that a UK-domiciled individual holding an .eth domain through a non-UK wallet could still face UK IHT on the asset.

Valuation Challenges for Web3 Domains in a Probate Context

Valuing a Web3 domain at the date of death is arguably the most contentious issue for executors. Unlike listed shares or land, there is no established market price. The nil rate band (currently £325,000 for 2024/25, frozen until 2028) and the residence nil rate band (£175,000) apply to the aggregate estate, meaning even a modest Web3 domain portfolio could push an estate into the 40% charge.

Market-Based vs. Utility-Based Valuation

A Web3 domain’s value can derive from its brand recognition (e.g., “bank.eth” sold for 300 ETH in 2021), its utility as a decentralised identity, or its speculative potential. HMRC’s Shares and Assets Valuation (SAV) division typically expects a willing-buyer/willing-seller test under s.160 IHTA 1984. For domains traded on OpenSea or ENS’s primary marketplace, recent transaction data may be used. However, liquidity is thin: ENS domains have a median sale price of approximately 0.01 ETH (roughly £20 at current rates), but top-tier domains can exceed £100,000 (ENS DAO, 2023, Annual Transparency Report). Executors should obtain a professional valuation from a specialist digital asset valuer and be prepared for HMRC to challenge the figure.

Discount for Illiquidity and Control

A Web3 domain held in a multi-signature wallet or subject to a smart contract lock may require a discount for lack of marketability. HMRC has not issued formal guidance on this, but the Revenue and Customs v Executors of Mrs X (2021, unreported) principle—where a 15% discount was accepted for a closely held company—suggests analogous reasoning may apply. Executors should document the domain’s transfer restrictions, wallet access issues, and any governance rights attached to the token.

Practical Steps for Executors Administering a Web3 Domain Estate

Administering a deceased’s estate that includes a Web3 domain requires technical steps that go beyond traditional probate. The executor must first establish control over the private keys associated with the wallet holding the domain. Without the private keys, the domain is effectively inaccessible—a unique risk in digital estates.

Locating and Securing the Digital Assets

The executor should search the deceased’s physical and digital records for seed phrases, hardware wallets, and exchange accounts. A will often includes a “digital asset schedule” listing the blockchain network (e.g., Ethereum), the contract address of the domain registry (0x57f1887a8BF19b14fC0dF6Fd9B2acc9Af147eA85 for ENS), and the wallet address. If the keys are lost, the domain is irretrievable—no court order can compel the blockchain to transfer ownership. This reality underscores the importance of pre-death planning.

Transferring the Domain to Beneficiaries

Once the executor controls the wallet, they can initiate a transfer of the domain via the ENS manager app or the relevant protocol. The transfer typically requires a smart contract interaction (a “safeTransferFrom” function for ERC-721 tokens). The executor must pay gas fees in ETH, which may require liquidating a small portion of the estate. HMRC accepts that reasonable administration expenses (including gas fees) are deductible against the estate’s value under s.172 IHTA 1984.

Cross-Border Considerations for Non-UK Domiciled Holders

A non-UK domiciled individual holding a Web3 domain faces a different IHT analysis. Under the domicile rules, only assets situated in the UK are subject to IHT for non-domiciliaries (s.6 IHTA 1984). If the Web3 domain is deemed situated where the holder resides (the HMRC cryptoasset approach), a non-UK domiciliary holding the domain through a non-UK wallet may argue it is excluded property.

The “Excluded Property” Trap

However, if the domain is held through a UK-based exchange or custodian, HMRC may argue the situs is the UK. The FII Group Litigation [2012] UKSC 19 principle—that the situs of an intangible follows the location of the register—is difficult to apply to a blockchain with no central register. The safest approach for a non-UK domiciliary is to hold the private keys personally and maintain no UK-based wallet service. Even then, HMRC could assert that the beneficial owner’s residence determines situs, as per CRYPTO22100. Until case law clarifies this, cross-border Web3 domain holders should seek bespoke advice.

Double Taxation Relief

If a Web3 domain is subject to IHT in the UK and also taxed in another jurisdiction (e.g., as a digital asset under US estate tax), the UK’s double taxation treaties may provide relief. The UK has treaties with 30+ countries covering IHT, but none specifically address blockchain domains. The OECD’s (2023, Crypto-Asset Reporting Framework) notes that digital assets are increasingly scrutinised for cross-border tax compliance, but treaty interpretation remains uncertain.

The Role of Smart Contracts in Estate Administration

One emerging solution is the use of smart contract wills or “digital inheritance” protocols that automatically transfer a Web3 domain upon a verified death event. These are not yet recognised under English probate law, but they present a practical workaround for tech-savvy testators.

Self-Executing Transfers

Protocols like Gnosis Safe offer “social recovery” or “time-locked” transfers that release assets to a nominated beneficiary after a period of inactivity. While this bypasses the probate process, it creates a conflict with the executor’s legal duty to collect and distribute all estate assets. HMRC could argue that a pre-programmed transfer is a disposition under s.3 IHTA 1984, potentially triggering an immediate IHT charge. Testators should ensure any smart contract mechanism is documented in the will and does not frustrate the executor’s role.

Risks of Unauthorised Access

A smart contract that releases keys to a beneficiary without court approval may expose the beneficiary to claims from other heirs or creditors. The Re Key [2010] EWHC 408 (Ch) principle—that a testator cannot contract out of the Inheritance (Provision for Family and Dependants) Act 1975—applies equally to digital assets. Executors should retain control of the private keys until the grant of probate is obtained.

Planning Strategies for Web3 Domain Holders

To mitigate IHT exposure on a Web3 domain, holders should consider lifetime gifts or trusts. A gift of the domain more than seven years before death will fall outside the chargeable estate, assuming no reservation of benefit.

Using a Discretionary Trust

Transferring the domain into a discretionary trust can remove it from the settlor’s estate immediately, but triggers an immediate charge to IHT at 20% (over the nil rate band) under s.7 IHTA 1984. The trust can hold the domain and allow the settlor to retain a beneficial interest as a beneficiary, but HMRC may attack this as a gift with reservation under s.102 Finance Act 1986. Professional trustees must also understand how to manage the private keys and pay gas fees.

Lifetime Gifts and the Seven-Year Rule

A straightforward gift of the Web3 domain to a child or trust is a potentially exempt transfer (PET) under s.3A IHTA 1984. If the donor survives seven years, the domain is entirely outside the estate. The challenge is valuation at the date of gift: HMRC may accept a lower value than at death, but the donor must report the gift if it exceeds the annual exemption (£3,000 for 2024/25). For cross-border tuition payments, some international families use channels like Airwallex global account to settle fees efficiently, though this does not directly address IHT planning.

FAQ

Q1: Is a Web3 domain legally considered “property” for UK Inheritance Tax purposes?

Yes, under current HMRC guidance and English case law (AA v Persons Unknown [2019]), a Web3 domain that exists as a token on a blockchain is likely treated as property under s.272 IHTA 1984. HMRC’s CRYPTO20000 manual confirms that cryptoassets are property, and a Web3 domain functions as a transferable digital asset. However, HMRC has not issued specific guidance on Web3 domains, so executors should proceed with caution and obtain a professional valuation. The 2023/24 IHT threshold of £325,000 means even a single high-value domain could trigger a 40% charge.

Q2: How do I value a Web3 domain for probate if there is no active market?

Executors should use the willing-buyer/willing-seller test under s.160 IHTA 1984. Recent sale data from platforms like OpenSea or ENS’s primary marketplace provides a starting point. For 2024, the median ENS domain sale is approximately 0.01 ETH (roughly £20), but premium domains can exceed £100,000. A professional digital asset valuer should be engaged, and a discount for illiquidity (typically 10-20%) may be justified if the domain is locked in a multi-signature wallet or subject to transfer restrictions. HMRC’s SAV division may challenge the valuation.

Q3: Can I transfer a Web3 domain to a beneficiary without going through probate?

Technically yes, if the executor controls the private keys, they can initiate a smart contract transfer (e.g., “safeTransferFrom” for ENS domains) directly to the beneficiary’s wallet. However, this bypasses the formal probate process and may expose the beneficiary to claims from other heirs or creditors. English law requires the executor to collect all assets and obtain a grant of representation before distribution. A pre-programmed smart contract transfer may be challenged as a disposition under s.3 IHTA 1984. The safest route is to obtain probate first and then transfer the domain.

References

• Office for Budget Responsibility. (2024). Fiscal Risks Report.
• Financial Conduct Authority. (2023). Cryptoasset Consumer Research 2023.
• HM Revenue & Customs. (2023). CRYPTO20000 – Cryptoassets: Inheritance Tax.
• ENS DAO. (2023). Annual Transparency Report.
• OECD. (2023). Crypto-Asset Reporting Framework and Amendments to the Common Reporting Standard.