UK IHT Considerations for Stablecoins: How to Report Digital Assets Pegged to Fiat Currency

HM Revenue & Customs (HMRC) has increasingly focused on cryptoassets, with its latest policy paper (2023) clarifying that stablecoins—digital assets pegged to fiat currency like GBP or USD—fall squarely within the UK’s inheritance tax (IHT) framework. As of the 2023/24 tax year, the standard nil rate band (NRB) stands at £325,000, meaning any stablecoin holdings above this threshold may trigger a 40% IHT charge upon death. According to the Office for National Statistics (ONS, 2023), approximately 4.4% of UK adults now hold cryptoassets, a figure that has tripled since 2019, and stablecoins represent a growing share due to their perceived stability. This article provides a practical guide for executors and estate planners on reporting stablecoins for IHT purposes, addressing valuation challenges, record-keeping obligations, and cross-border implications for those with UK assets.

What Are Stablecoins and Why Do They Matter for IHT?

Stablecoins are a type of cryptocurrency designed to maintain a stable value by pegging to a reserve asset, most commonly a fiat currency such as the US dollar or pound sterling. Unlike volatile assets like Bitcoin, stablecoins like USDC, USDT, or GBP-backed tokens aim for a 1:1 ratio with their reference currency. For IHT purposes, HMRC treats all cryptoassets—including stablecoins—as chargeable assets under the Inheritance Tax Act 1984, meaning their value at the date of death forms part of the deceased’s estate.

The practical significance is clear: if an individual holds £100,000 in USDC across multiple wallets, that sum must be reported alongside traditional assets like property or shares. HMRC’s Cryptoassets Manual (CRYPTO20000, updated 2023) explicitly states that stablecoins are not excluded from IHT simply because they are digital or pegged. Executors must therefore identify, value, and report these holdings, or face potential penalties for under-declaration.

HMRC’s Classification of Stablecoins

HMRC categorises stablecoins as exchange tokens under its existing framework, which also includes Bitcoin and Ethereum. This means they are treated as property for capital gains tax (CGT) and IHT purposes, not as currency or financial instruments. The key distinction for IHT is that stablecoins are not considered ‘cash’ even if pegged to GBP—they remain a digital asset requiring specific valuation at the date of death.

Why Pegged Assets Still Trigger IHT

The peg mechanism does not exempt stablecoins from IHT. For example, if a stablecoin de-pegs (deviates from its 1:1 value) on the date of death, the executor must use the actual market value, not the intended peg. HMRC’s guidance (2022) confirms that valuation must reflect the open-market price at the time of death, which may differ from the peg due to liquidity or exchange issues.

Valuation Challenges for Stablecoin Holdings

Valuing stablecoins for IHT presents unique difficulties compared to traditional assets. Unlike a bank account balance, which is straightforward, stablecoin values depend on the specific exchange or platform used at the date of death. HMRC requires a reasonable and consistent valuation method, typically using the closing price from a major, HMRC-recognised exchange like Coinbase or Binance on the date of death.

For executors, the challenge intensifies if the deceased held stablecoins across multiple wallets or blockchains (e.g., Ethereum, Solana). Each token may have a slightly different market price, and transaction fees (gas fees) can affect net value. HMRC’s CRYPTO20050 (2023) advises using the weighted average price from at least two independent sources where possible. If no active market exists—for instance, with a lesser-known stablecoin—executors may need to commission a professional valuation, adding cost and time to probate.

De-pegging Risks and Valuation Date

A notable risk is stablecoin de-pegging. In May 2022, TerraUSD (UST) collapsed from its $1 peg to near zero, wiping out billions in value. For IHT, if a stablecoin de-pegs on the date of death, the executor must report the lower market value, which could significantly reduce the estate’s IHT liability—or create disputes with HMRC if the peg later recovers. HMRC’s stance (2023) is that valuation is fixed at the date of death, not adjusted retrospectively.

Record-Keeping Requirements

Executors must gather detailed records: wallet addresses, transaction histories, exchange statements, and dates of acquisition. HMRC’s Cryptoassets Manual (CRYPTO20100) recommends maintaining a chronological log of all transactions, including fees, to support valuations. Without this, executors risk HMRC challenging the reported value, potentially leading to penalties of up to 100% of the underpaid tax (Finance Act 2007, Schedule 24).

Reporting Stablecoins on the IHT400 Form

Reporting stablecoins on the IHT400 (the main inheritance tax account form) requires careful attention to the correct schedule. Stablecoins are not listed as a separate category; instead, they fall under ‘Other assets not already included’ (Schedule 5, Box 60-63). Executors must describe the asset clearly—e.g., ‘Stablecoin holdings: USDC (USD Coin) on Ethereum network’—and provide the total value in GBP at the date of death.

For estates exceeding the NRB (£325,000 for 2023/24), the 40% IHT rate applies to the excess, including stablecoin values. If the deceased was married or in a civil partnership, any unused NRB can be transferred to the surviving spouse (transferable nil rate band), potentially doubling the threshold to £650,000. Executors should also consider the residence nil rate band (RNRB), which adds up to £175,000 for a main home passed to direct descendants, but stablecoins do not qualify for this relief.

Practical Steps for Executors

First, compile a list of all stablecoin wallets and exchange accounts. Second, obtain a valuation from a reputable exchange or third-party tool as of the death date. Third, complete the IHT400, attaching a detailed schedule of cryptoassets. For cross-border estates, where the deceased held assets overseas, executors may need to file additional forms (e.g., IHT402 for foreign assets) and consider double taxation treaties. Some international families use channels like Airwallex global account to manage cross-currency transfers efficiently during probate.

Penalties for Non-Reporting

HMRC has increased enforcement on cryptoassets. In 2022, it issued ‘nudge letters’ to over 10,000 crypto holders, reminding them of tax obligations. For IHT, failure to report stablecoins can result in penalties under the Finance Act 2008, ranging from 30% to 100% of the tax due, depending on whether the omission was careless or deliberate. Executors should err on the side of full disclosure.

Cross-Border IHT Issues for Stablecoin Holders

Cross-border estates present additional complexity for stablecoin holders. If the deceased was domiciled outside the UK but held UK assets (including stablecoins on a UK-based exchange), only the UK-situs assets are subject to UK IHT. However, stablecoins are considered situs where the owner is resident, not where the exchange is based, under HMRC’s guidance (International Manual, INTM154030, 2023). This means a non-UK domiciled individual holding stablecoins on a UK exchange may still avoid UK IHT if they are not UK-domiciled, but careful analysis is needed.

For UK-domiciled individuals living abroad, all worldwide assets—including stablecoins—are subject to UK IHT. This includes tokens held on foreign exchanges like Kraken or Bitstamp. Executors must convert the value to GBP using HMRC’s exchange rates for the date of death (published monthly), not the exchange’s internal rate. Double taxation treaties (e.g., with the US or Switzerland) may provide relief, but stablecoins are rarely explicitly covered, requiring bespoke legal advice.

Domicile and Stablecoin Situs

HMRC’s position (2023) is that stablecoins have situs where the beneficial owner is resident, not where the blockchain node operates. This aligns with case law on intangible assets (e.g., Re Cigala’s Settlement Trusts). For non-doms, the remittance basis may apply, but stablecoins used for UK property purchases could create a UK IHT charge.

Practical Example: Mrs X

Mrs X, a UK-domiciled widow, held £500,000 in USDC on a US-based exchange at her death in 2023. Her total estate was £1.2 million, exceeding the NRB. Her executor reported the USDC at market value (£500,000), applied the NRB of £325,000, and paid IHT of 40% on the excess (£350,000), totalling £140,000. Without proper reporting, HMRC could have imposed a 50% penalty.

Future Regulatory Developments and IHT Planning

Regulatory changes are on the horizon. The UK government’s Financial Services and Markets Act 2023 brought stablecoins under the regulatory perimeter of the Financial Conduct Authority (FCA), effective from 2024. This may affect IHT reporting as exchanges will be required to hold client assets in trust, potentially simplifying valuation and recovery for executors. However, HMRC has not yet issued specific IHT guidance for FCA-regulated stablecoins.

For estate planning, holding stablecoins in a trust or nominee account can reduce IHT exposure. If stablecoins are held in a discretionary trust, they may fall outside the deceased’s estate for IHT purposes, though periodic charges (every 10 years) apply at up to 6%. Alternatively, gifting stablecoins more than seven years before death removes them from the estate, subject to potentially exempt transfers (PETs). The annual gift exemption (£3,000 for 2023/24) applies, but larger gifts require surviving seven years to avoid IHT.

Impact of the 2023 Finance Act

The Finance Act 2023 introduced no direct changes to IHT on cryptoassets, but it confirmed HMRC’s power to request information from crypto exchanges under the OECD’s Crypto-Asset Reporting Framework (CARF), effective from 2026. This will increase transparency, making non-reporting riskier.

Planning Tips for High-Net-Worth Individuals

For those with significant stablecoin holdings, consider: (1) transferring to a spouse (spouse exemption, no IHT); (2) using a life insurance policy written in trust to cover the IHT liability; (3) maintaining detailed records to avoid penalties. Professional advice is essential given the evolving landscape.

FAQ

Q1: Do I need to report stablecoins on my IHT400 if their value is below the nil rate band?

Yes, you must report all stablecoin holdings on the IHT400, even if the total estate is below the £325,000 nil rate band (2023/24). HMRC requires full disclosure of all assets to confirm no tax is due. Failure to report can lead to penalties of up to 100% of the tax underpaid, even if no tax is ultimately payable, as per the Finance Act 2007.

Q2: How do I value a stablecoin that has de-pegged on the date of death?

Use the actual market price from a major exchange at the date of death, not the intended peg. HMRC’s Cryptoassets Manual (CRYPTO20050, 2023) advises using a weighted average from at least two independent sources. For example, if USDC trades at $0.90 on the death date, report that value, even if it later recovers to $1.00.

Q3: Are stablecoins held on a non-UK exchange subject to UK IHT?

For UK-domiciled individuals, yes—all worldwide assets, including stablecoins on foreign exchanges, are subject to UK IHT. For non-UK domiciled individuals, only UK-situs assets are liable, and stablecoins are generally considered situs where the owner is resident, not where the exchange is based (HMRC International Manual, INTM154030, 2023).

References

HM Revenue & Customs. (2023). Cryptoassets Manual (CRYPTO20000–CRYPTO20100).
HM Revenue & Customs. (2023). International Manual (INTM154030): Situs of Intangible Assets.
Office for National Statistics. (2023). Cryptoasset Ownership in the UK: 2023 Update.
HM Revenue & Customs. (2022). Inheritance Tax Manual (IHTM27000): Valuation of Assets.
OECD. (2023). Crypto-Asset Reporting Framework (CARF) and Amendments to the Common Reporting Standard.