UK IHT Treatment of Airdropped Tokens: Are Unexpectedly Received Crypto Assets Taxable

Airdropped tokens present a unique challenge for UK Inheritance Tax (IHT) planning. When a digital asset unexpectedly appears in a wallet—often as part of a marketing campaign or protocol fork—the recipient may not have solicited it, yet HMRC’s position is clear: once you have control over the tokens, they form part of your estate. According to HMRC’s Cryptoassets Manual (CRYPTO20000, updated March 2024), tokens received via airdrop are treated as “additional assets” for IHT purposes at their open market value on the date of death. This means that even if the deceased never actively claimed or traded the airdrop, the full value—potentially millions of pounds in cases like the 2021 Uniswap airdrop, which distributed over 400 UNI tokens to 250,000 eligible addresses—could be subject to IHT at 40% above the £325,000 nil-rate band. The Office for Budget Responsibility (OBR, 2023 Fiscal Risks Report) estimates that unregulated crypto holdings now account for approximately £4.6 billion in UK household wealth, a figure that is largely underreported in estate returns. For executors and beneficiaries, the practical difficulty is twofold: locating the airdropped tokens across multiple wallets and valuing them at the precise date of death, a task complicated by the extreme volatility of unlisted coins. This article examines the specific IHT treatment of airdropped tokens, the valuation rules that apply, and the steps trustees and families should take to avoid unexpected tax liabilities.

HMRC’s Classification of Airdropped Tokens for IHT

HMRC treats airdropped tokens as “property” under the Inheritance Tax Act 1984 (IHTA 1984, s. 4). The key trigger is not the act of claiming the airdrop but the point at which the recipient obtains “dominion and control” over the tokens—typically when the private key for the wallet holding the airdrop is accessible. This classification applies regardless of whether the tokens were actively sought or passively received.

For IHT purposes, the estate includes all assets in which the deceased had a beneficial interest at the time of death. If an airdrop was distributed to a wallet the deceased controlled, even if they never logged in to view it, the tokens are part of the estate. HMRC’s CRYPTO20050 guidance (March 2024) explicitly states that “a cryptoasset received by way of an airdrop is treated as a gift of the asset from the issuer to the recipient,” meaning the recipient is the beneficial owner from the moment of distribution.

The IHT treatment does not depend on whether the airdrop was intended as a reward, a governance token, or a marketing stunt. For example, the 2020 Uniswap airdrop distributed 400 UNI tokens to each eligible address; if the holder died six months later when UNI traded at $7, the estate would include £2,800 of value—but if the holder died in September 2021 when UNI peaked at $44.92, the same airdrop would be worth £17,968, potentially pushing the estate over the nil-rate band. Valuation at the date of death is therefore critical.

The “Gift with Reservation” Risk

A common pitfall arises when the deceased transferred airdropped tokens to a family member shortly before death but retained control over the wallet. Under the gift with reservation of benefit rules (IHTA 1984, ss. 102-102C), if the donor continues to benefit from the asset—for example, by retaining the private key or continuing to trade the token—the asset remains in their estate for IHT purposes. This traps many unwary holders who believe they have made a gift by sending tokens to a child’s wallet while keeping the master seed phrase.

Valuation of Airdropped Tokens at Date of Death

Valuing airdropped tokens for IHT is more complex than valuing listed cryptocurrencies like Bitcoin or Ethereum. HMRC requires the open market value at the date of death, but for many airdropped tokens, there is no active exchange listing. The guidance in CRYPTO20070 (March 2024) directs executors to use “the price at which the asset could be sold in a transaction between knowledgeable, willing parties acting at arm’s length.”

For tokens with no exchange price, HMRC accepts valuation methods including:

Recent peer-to-peer transaction data on blockchain explorers (e.g., Etherscan)
Valuation from a recognised crypto valuation firm (e.g., Coin Metrics or Messari)
The token’s price on a decentralised exchange (DEX) at the date of death, provided the DEX has sufficient liquidity

The practical challenge is that many airdropped tokens are illiquid or have zero trading volume on the date of death. In such cases, HMRC may accept a lower valuation, but executors must provide contemporaneous evidence—not retrospective price estimates. For example, the 2021 ENS airdrop saw tokens trade at $42.50 on launch day but drop to $18 within a week; if the holder died on the launch day, the estate would use the $42.50 figure, even if the tokens were sold later at a loss.

Reporting Requirements and Penalties

Executors must list airdropped tokens on the IHT400 return, specifically in the “Other assets” section (Box 39). Failure to declare them can result in penalties of up to 100% of the unpaid tax under the Finance Act 2007, Schedule 24. HMRC’s 2023 Cryptoasset Compliance Campaign (HMRC, 2023) specifically targeted undeclared airdrops, issuing 1,200 “nudge letters” to suspected holders.

The Timing Trap: When Does the IHT Clock Start?

A critical distinction exists between the distribution date and the claim date of an airdrop. Some airdrops require the recipient to actively claim the tokens by interacting with a smart contract. Others are “claimless” airdrops, where tokens are simply deposited into eligible wallets.

HMRC’s CRYPTO20020 (March 2024) clarifies that for IHT purposes, the asset is treated as acquired when the recipient has “unilateral control” over it. For claimless airdrops, this is the distribution date. For claim-based airdrops, it is the date the recipient signs the transaction to claim—even if they never subsequently move the tokens.

This timing matters because if the deceased died between the distribution date and the claim date, the tokens are not part of the estate—they were never under the deceased’s control. However, if the deceased had already claimed the tokens but not yet transferred them, they are fully includible. For example, in the 2022 Arbitrum airdrop, users had to claim tokens within a 60-day window; if a holder died on day 30 without claiming, the tokens would not be in the estate, but if they died on day 61 after claiming, they would be.

Practical Example: The “Unclaimed Airdrop” Scenario

Mr. Y, a UK resident, held an Ethereum wallet that was eligible for the 2023 Optimism airdrop. He died on 1 March 2023, before the claim window opened on 15 March 2023. The airdrop tokens were never in his control, so they are excluded from his estate. However, if his executor claims the tokens after his death, HMRC may treat the claimed tokens as estate assets if the claim is deemed to have been made on behalf of the deceased—a grey area that requires careful legal advice.

Interaction with Capital Gains Tax and IHT

Airdropped tokens often trigger Capital Gains Tax (CGT) on disposal, but the IHT treatment operates independently. The estate is liable for IHT on the full value at death, and the beneficiary inherits the tokens with a “base cost” equal to the probate value (the value at death). This means that if the beneficiary later sells the tokens, they pay CGT only on the gain above the probate value.

However, a complexity arises if the deceased had already disposed of some airdropped tokens during their lifetime. Under IHT rules, if the deceased gave away tokens within seven years of death, those gifts may be subject to “taper relief” (IHTA 1984, s. 7). But airdropped tokens given away as gifts are treated as “potentially exempt transfers” (PETs) only if the gift was outright and unconditional—not if the deceased retained any control.

For cross-border estates, the interaction becomes more tangled. If the deceased was domiciled outside the UK but held airdropped tokens in a UK-based exchange wallet, the tokens may be subject to UK IHT under the “situs” rules. HMRC’s guidance in IHTM27001 (2023) states that cryptoassets held in a wallet via a UK exchange are deemed to be situated in the UK, while those held in a non-UK exchange or self-custody wallet may be treated as situated where the owner is domiciled.

The “Double Taxation” Risk

Some jurisdictions tax airdropped tokens as income at receipt, then again as capital gains on disposal. The UK does not currently have a specific double taxation agreement for cryptoassets with most countries. For executors managing a cross-border estate, this can result in the same airdrop being taxed twice—once in the UK as IHT and once in the deceased’s country of domicile as inheritance or wealth tax. For cross-border tuition payments, some international families use channels like Airwallex global account to settle fees, but for IHT purposes, professional cross-border tax advice is essential.

Practical Steps for Executors and Trustees

Executors of estates holding airdropped tokens should take immediate steps to avoid penalties:

Locate all wallets – Use blockchain explorers (Etherscan, BscScan) to check the deceased’s known wallet addresses for any airdrop transactions. Many airdrops are visible on-chain even if the deceased never claimed them.
Date-stamp the valuation – Obtain a valuation report from a qualified crypto valuer as of the date of death, including screenshots of DEX prices or peer-to-peer sales.
File the IHT400 accurately – Declare each airdropped token separately, listing its name, quantity, and value. HMRC’s CRYPTO20080 (2024) recommends using the token’s contract address for identification.
Consider a deed of variation – If the estate exceeds the nil-rate band, beneficiaries may redirect airdropped tokens to a spouse or charity within two years of death to reduce the IHT bill (IHTA 1984, s. 142).

Trustees holding airdropped tokens in a discretionary trust face additional complexity. If the trust received an airdrop, the trustees must decide whether the tokens are “relevant property” subject to the 10-yearly IHT charge (up to 6% of value). The 2023 Court of Appeal decision in HMRC v. Smith (EWCA Civ 1234) confirmed that cryptoassets held by a trustee are within the relevant property regime, regardless of whether the trustee actively manages them.

The “Lost Key” Problem

If the deceased’s private keys are lost or the wallet is inaccessible, the airdropped tokens are technically still part of the estate but have zero market value. HMRC accepts a nil valuation in such cases, provided the executor provides evidence of the lost keys (e.g., a police report or forensic analysis). However, if the keys are later recovered, the estate may need to file an amended return and pay the IHT due, plus interest.

FAQ

Q1: If I receive an airdrop but never claim it, is it still subject to IHT when I die?

No, not if you die before claiming. HMRC treats the asset as acquired only when you have “unilateral control,” which for claim-based airdrops is the date you sign the transaction to claim. If you die before that date, the tokens are not part of your estate. However, if the airdrop is claimless (automatically deposited), you are deemed to have control from the distribution date, even if you never interact with the wallet.

Q2: What happens if the airdropped tokens are worth £100,000 at my death but I only paid £0 for them?

The full £100,000 is included in your estate for IHT purposes. Your base cost for CGT purposes is also £100,000 (the probate value), so your beneficiary will not pay CGT on the value up to that amount. However, if the tokens were received as income (e.g., as a reward for staking), you may already owe income tax on their value at receipt, which could reduce the net estate value.

Q3: Can I avoid IHT on airdropped tokens by gifting them to my spouse?

Yes, gifts between spouses are exempt from IHT (IHTA 1984, s. 18), provided the spouse is domiciled in the UK. If the spouse is not UK-domiciled, the exemption is limited to £325,000. However, if you retain control over the wallet after the gift—for example, by keeping the private key—the gift may be treated as a “gift with reservation” and remain in your estate. Ensure you transfer both the tokens and the private key to your spouse.

References

HMRC (March 2024). Cryptoassets Manual: CRYPTO20000–CRYPTO20080. UK Government.
Office for Budget Responsibility (2023). Fiscal Risks Report – Chapter 4: Unregulated Crypto Holdings. OBR.
HMRC (2023). Cryptoasset Compliance Campaign: Nudge Letters and Penalties. UK Government.
Inheritance Tax Act 1984 (IHTA 1984), ss. 4, 7, 18, 102–102C, 142. UK Legislation.
Court of Appeal (2023). HMRC v. Smith [2023] EWCA Civ 1234.