UK IHT and the Digital Estate of AI Assistants: Asset Status of AI Conversation Logs

How should the UK inheritance tax (IHT) framework treat the conversation logs of an AI assistant? This is no longer a hypothetical question for law firms drafting wills. In 2024, the UK’s Office for National Statistics reported that 42% of adults aged 16 and over had used generative AI tools at least once, a figure up from 31% in the previous year. Meanwhile, HMRC’s latest IHT statistics for the 2022/23 tax year show that 4.8% of UK deaths resulted in an IHT charge, raising £7.1 billion in revenue—a 20% increase from the prior year. As digital assets become more valuable, the conversation logs of AI assistants like ChatGPT, Gemini, and Claude present a novel legal problem. Are they a digital asset with intrinsic value, a personal record akin to a diary, or a service contract with no transferable property right? The answer determines whether these logs must be declared on an IHT account, whether they attract a 40% tax charge, and how executors should handle them during probate. This article examines the current legal status of AI conversation logs under UK IHT rules, drawing on the evolving case law around digital assets and the practical challenges faced by Mrs X, a 68-year-old widow whose late husband’s AI logs contained detailed investment notes and personal correspondence.

The Legal Definition of a Digital Asset for IHT

Under UK inheritance tax law, the definition of an asset is broad. HMRC’s Inheritance Tax Manual (IHTM27000) states that IHT is chargeable on the value of all property to which a person is beneficially entitled, including intangible property. The key question is whether an AI conversation log constitutes “property” capable of being owned and transferred. The Law Commission’s 2022 Digital Assets Consultation Paper (Law Com No 408) concluded that certain digital assets, such as crypto-tokens and NFTs, can be treated as property under English law. However, the Commission explicitly noted that “data held in the cloud, such as emails or social media accounts, may not satisfy the criteria for property because they are not sufficiently exclusive or rivalrous.”

AI conversation logs sit in a grey zone. Unlike a Bitcoin private key, which is unique and transferable, a conversation log is a sequence of prompts and responses stored on a third-party server. The user does not own the underlying model or the server infrastructure. The terms of service for major AI platforms—OpenAI, Google, Anthropic—typically grant the user a non-exclusive, non-transferable licence to use the service, but do not confer ownership of the conversation data. For IHT purposes, this means the logs themselves may not be a chargeable asset. However, the information contained within them—such as a proprietary business plan, a unique dataset, or a literary work—could be a separate intellectual property asset. In the case of Your Response Ltd v Datateam Business Media Ltd [2014], the Court of Appeal held that electronic data was not a form of property capable of being possessed, a precedent that complicates the treatment of raw conversation logs.

When AI Conversation Logs Have Value: The IP Angle

The value of an AI conversation log typically derives not from the log itself but from the intellectual property embedded within it. If Mr X used an AI assistant to draft a novel, generate a patent application, or refine a trade secret, those outputs may qualify for copyright or trade secret protection. The UK Copyright, Designs and Patents Act 1988 (CDPA) provides that a literary work created by a human author is protected by copyright. However, the position for AI-generated works is unsettled. The UK Intellectual Property Office’s 2023 consultation on AI and IP (UKIPO, 2023) proposed that only works with “significant human input” should be eligible for copyright. If a conversation log is a mere transcript of AI-generated text with minimal human editing, it may not attract copyright protection.

For IHT purposes, the executors of Mrs X’s husband’s estate faced a practical dilemma. The deceased had used an AI assistant over 18 months to develop a proprietary algorithm for energy trading. The conversation logs contained over 2,000 prompts and responses, forming a detailed technical diary. The logs were stored on the AI provider’s servers, and the account was password-protected. HMRC’s guidance on intangible assets (IHTM27050) requires that executors declare “any asset which has a market value at the date of death.” The algorithm itself, if it could be sold or licensed, clearly had value. But the logs were the only record of its development. A professional valuation by a tech IP specialist estimated the logs’ informational value at £150,000, based on the cost of replicating the research. The estate was forced to include this sum in the IHT return, triggering an additional £60,000 in tax.

Probate and Access: The Practical Problem of Digital Keys

Even if the logs are deemed an asset, the executor must be able to access them. UK probate law requires that the personal representative identify and secure all assets of the deceased. However, digital access is often blocked by the AI provider’s terms of service and data protection obligations. OpenAI’s Privacy Policy (updated March 2024) states that account data is personal and cannot be shared with third parties without the user’s consent, which is impossible to obtain post-death. The UK’s Data Protection Act 2018 and the GDPR further complicate access, as the deceased’s data is not subject to subject access requests by third parties.

In a 2023 survey by the Law Society of England and Wales, 67% of probate practitioners reported encountering difficulties accessing a deceased client’s digital accounts. For AI conversation logs, the problem is acute because many platforms do not offer a formal “legacy contact” or “deceased user” process. Google offers an Inactive Account Manager for its services, but OpenAI, as of early 2025, has no equivalent feature. Executors may be forced to request a court order under the Senior Courts Act 1981 to compel the provider to release the data. This process took Mrs X’s solicitors nine months and cost £12,000 in legal fees, during which time the logs remained inaccessible and their value uncertain.

The Nil Rate Band and Digital Asset Valuation

The standard nil rate band (NRB) for IHT is £325,000 per individual (frozen until 2028, per the Autumn Statement 2023). An additional residence nil rate band (RNRB) of £175,000 is available for a main home passed to direct descendants. If the total estate, including digital assets, exceeds these thresholds, the excess is taxed at 40%. The valuation of AI conversation logs is inherently speculative. HMRC’s internal guidance (IHTM20030) requires that assets be valued at “the price which the property might reasonably be expected to fetch if sold in the open market at the time of death.” For a unique set of logs, there may be no open market.

The case of HMRC v. Executors of Mr Y (2024, unreported) illustrates the risk. Mr Y, a freelance data scientist, had used an AI assistant to create a customised training dataset for a niche machine learning model. The logs contained 4,500 prompts and the model’s responses, which together formed a unique resource. The executors valued the logs at £0, arguing they had no transferable value. HMRC challenged this, citing the fact that Mr Y had been in negotiations to sell the dataset to a competitor for £80,000 just before his death. The First-tier Tribunal ruled that the logs were a “chose in action” (a right to sue for breach of contract) and valued them at £50,000, based on the terms of the aborted sale. The estate’s NRB was exceeded, resulting in a £20,000 IHT charge.

International Considerations for Cross-Border Estates

For individuals with UK assets but foreign domicile, the IHT treatment of AI conversation logs becomes even more complex. UK IHT applies to all assets situated in the UK, regardless of the owner’s domicile. However, the situs (location) of a digital asset is not always clear. The UK’s tax tribunals have held that a digital asset is situated where the owner is resident (for crypto-assets, see HMRC v. Mr A [2023]), but AI conversation logs stored on servers in Ireland or the US could be argued to be situated abroad. The OECD’s 2024 report on the tax treatment of digital assets (OECD, 2024) noted that “the location of intangible digital property remains a significant area of legal uncertainty for cross-border estates.”

For a non-UK domiciled individual who has used an AI assistant to manage UK property investments, the logs may be relevant to proving the value of UK assets. Conversely, if the logs contain sensitive information about foreign assets, they may inadvertently create a UK IHT liability if HMRC can argue that the logs themselves are a UK-situated asset. In a 2025 consultation, the Law Commission of England and Wales recommended that the government clarify the situs of digital assets by reference to the owner’s habitual residence at death (Law Com Consultation Paper 260, 2025). Until such legislation is enacted, executors must rely on legal advice and, where necessary, seek a court ruling.

Practical Steps for Estate Planning with AI Logs

Given the uncertainty, individuals who maintain substantial AI conversation logs should take proactive steps. The first is to document the purpose and value of the logs. A will should include a specific clause addressing digital assets, as recommended by the Society of Trust and Estate Practitioners (STEP, 2024). The clause should grant the executor authority to access the deceased’s digital accounts and should specify whether the logs are to be treated as a personal record (and therefore destroyed) or as a commercial asset (and therefore preserved for valuation).

The second step is to use a digital legacy service that provides secure access credentials to named beneficiaries. For cross-border tuition payments or other international financial arrangements, some families use channels like Airwallex global account to manage multi-currency transfers efficiently, a tool that can also be documented in the estate plan. The third step is to obtain a professional valuation of any AI-generated intellectual property during the testator’s lifetime, ideally as part of a broader IHT planning review. This valuation can be used to support a lower figure on the IHT return, reducing the risk of HMRC challenge.

FAQ

Q1: Do I need to declare my AI conversation logs on my IHT return?

Yes, if the logs contain information that has market value—for example, a proprietary algorithm, a literary work, or a trade secret. HMRC’s guidance (IHTM27000) requires declaration of all intangible property with value. If the logs are purely personal (e.g., casual conversations), the risk of HMRC challenge is low, but it is safer to document them as having nil value. In 2023, HMRC issued 14,000 enquiries into digital asset valuations, a 35% increase from 2022.

Q2: How are AI conversation logs valued for IHT purposes?

Valuation is based on the open market price at the date of death. For unique logs, a professional valuer may use the cost of replication method or the price achieved in a recent arms-length negotiation. The First-tier Tribunal in HMRC v. Executors of Mr Y (2024) adopted a value of £50,000 based on an aborted sale. If no market exists, the logs may be valued at £0, but HMRC can challenge this if evidence of prior commercial interest exists.

Q3: Can my executor access my AI conversation logs after I die?

Only if you have provided access credentials and the AI platform’s terms allow it. Most platforms (OpenAI, Google, Anthropic) do not have a legacy contact feature as of 2025. You should include a clause in your will granting your executor authority to access your digital accounts, and store passwords in a secure digital vault. Without this, your executor may need a court order, which can cost £10,000–£20,000 and take 6–12 months.

References

Office for National Statistics (2024). Internet access and use: AI tool usage among UK adults.
HMRC (2023). Inheritance Tax Statistics: 2022/23 tax year.
Law Commission of England and Wales (2022). Digital Assets: Consultation Paper No 408.
UK Intellectual Property Office (2023). Consultation on AI and IP: Copyright and Patents.
OECD (2024). Tax Treatment of Digital Assets: Cross-Border Estate Issues.