UK IHT Relief for Patent Holders: Can Commercial Intellectual Property Qualify as Business Property

In the 2023–24 tax year, HM Revenue & Customs collected £7.5 billion in inheritance tax (IHT) receipts, a figure that has more than doubled from £3.6 billion a decade earlier, according to HMRC’s Annual IHT Statistics (2024). For UK-resident inventors and patent holders, this rising tax burden makes the distinction between personal intellectual property (IP) and commercial business property critical. Under the Inheritance Tax Act 1984, Business Property Relief (BPR) can reduce the taxable value of qualifying assets by 50% or 100%, but the treatment of patents and other IP rights has long been a grey area. The Office for National Statistics reported that UK businesses held £153.4 billion in intangible assets in 2022, a 14% increase year-on-year, underscoring the growing importance of IP in estate planning. This article examines whether commercial intellectual property—specifically patents—can qualify as business property for IHT relief, drawing on HMRC guidance, case law, and practical scenarios.

The Legal Framework: Business Property Relief Under IHTA 1984

Business Property Relief was introduced to prevent the forced sale of family businesses upon the owner’s death. Section 104 of the Inheritance Tax Act 1984 provides that relevant business property is relieved from IHT at either 50% (for land, buildings, or machinery owned by a controlling shareholder and used in the business) or 100% (for a sole trader’s business or an unincorporated interest in a partnership).

To qualify, the property must have been held for at least two years prior to the transfer (s.106). Crucially, assets held wholly or mainly as an investment are excluded from relief (s.105(3)). This exclusion is the primary hurdle for patent holders: HMRC frequently argues that patents held passively—licensed for royalties without active exploitation—are investment assets rather than business property.

The burden of proof falls on the taxpayer. In HMRC v. George [2003] UKSC, the Supreme Court clarified that the “wholly or mainly as an investment” test requires an examination of the asset’s function in the context of the taxpayer’s overall activities. A patent that is actively developed, managed, and commercialised within a trading business is far more likely to qualify than one held solely for royalty income.

When Patents Qualify as Business Property

Active commercial exploitation is the key criterion. A patent held by a sole trader or partnership that manufactures products under that patent—and derives the majority of its turnover from those products—will typically qualify for 100% BPR. HMRC’s Inheritance Tax Manual (IHTM25272) states that “intellectual property owned by a trading business and used in that business will normally be relevant business property.”

Consider Mrs X, a UK-resident inventor who registered a patent for an industrial filtration system in 2018. She operates as a sole trader, manufacturing and selling the filters directly to engineering firms. Her patent is integral to her trading activities, and she has held it for over two years. In this scenario, the patent should qualify for 100% BPR, reducing her estate’s IHT liability from potentially £1.2 million to zero on that asset.

The same principle applies to patents held through a trading company or partnership. If the company uses the patent to produce goods or services, the shares in that company—or the partnership interest—will qualify for relief. HMRC’s internal guidance (IHTM25361) confirms that “shares in a company whose business consists wholly or mainly of holding investments” do not qualify, but a company actively trading under its own patents does.

The Investment Trap: Passive Royalty Income

Passive licensing presents the greatest risk. If a patent holder licenses the IP to third parties and does not otherwise participate in manufacturing or commercial activity, HMRC will treat the patent as an investment asset. In HMRC v. Brander [2010] UKUT, the Upper Tribunal ruled that a woodlands estate managed for commercial timber production was trading, but the same logic does not automatically extend to IP.

A 2022 HMRC consultation on intangible assets (HMRC, 2022, Taxation of Intellectual Property) noted that “royalty income derived from licensing patents without active management is generally considered investment income for IHT purposes.” This means that a retired inventor who simply collects annual licence fees from a manufacturer will lose BPR entirely.

Mr Y, a 68-year-old engineer, holds a patent for a medical device component. He licensed it to a German manufacturer in 2019 and receives £50,000 per year in royalties. He has no other business activity. HMRC would likely deny BPR on the patent, leaving his estate liable for 40% IHT on its capitalised value—potentially £200,000 on a £500,000 valuation. To avoid this, Mr Y could incorporate a trading company that develops the device further, or actively manage the licensing terms and quality control to demonstrate trading activity.

Cross-Border Considerations for Non-UK Domiciliaries

Non-UK domiciled individuals holding UK patents face additional complications. The UK’s IHT regime applies to assets situated in the UK regardless of the owner’s domicile, unless a double-taxation treaty provides otherwise. A patent registered with the UK Intellectual Property Office (UKIPO) is considered a UK-situated asset.

For a US-resident patent holder with UK IP, the US-UK Estate Tax Treaty (1978) may provide relief, but BPR is a UK-specific relief not mirrored in US law. The treaty allows a credit for UK IHT paid against US estate tax, but only if the asset qualifies for BPR in the UK. If HMRC denies BPR, the estate faces full UK IHT at 40% with limited US offset.

Planning tip: Non-UK domiciliaries should consider holding UK patents through an offshore company that conducts active trading. However, HMRC’s anti-avoidance rules (s.105A IHTA 1984) target arrangements where the main purpose is to obtain BPR. The company must have actual trading substance—employees, premises, and commercial activity—not merely a shell.

Since 2017, HMRC has increased scrutiny of cross-border IP arrangements. The 2024 OECD report Transfer Pricing and Intangible Assets highlighted that tax authorities globally are targeting passive IP holding structures. UK patent holders with international elements should expect HMRC to request evidence of active management and trading.

Valuation Challenges and Practical Steps

Valuing a patent for IHT purposes requires specialist expertise. Unlike quoted shares or real estate, patents have no ready market. HMRC’s Shares and Valuation division will assess the patent’s value based on projected royalty income, remaining patent life (typically 20 years from filing), and market comparables.

The valuation date is the date of death (or date of transfer for lifetime gifts). A patent with five years remaining will be worth less than one with fifteen years, but if the patent is actively used in a trading business, its value may be bundled with goodwill and other intangible assets. In IRC v. Crossman [1937], the House of Lords established that assets must be valued on a “willing buyer” basis, which for patents often means a discounted cash flow analysis.

Practical steps to secure BPR:

Document active commercial use: sales records, manufacturing contracts, marketing materials.
Avoid passive licensing structures; if licensing is necessary, manage the licensee’s quality and actively negotiate terms.
Hold the patent through a trading company or partnership, not as an individual asset.
Maintain the two-year holding period; transferring the patent to a new entity resets the clock.
Seek a formal HMRC clearance or non-statutory clearance on the asset’s status before death.

For cross-border IP management, some patent holders use international business platforms to structure their holdings efficiently. Services like Airwallex global account can facilitate multi-currency royalty collections and expense management, though the underlying tax treatment depends on commercial substance.

Recent Developments and Future Outlook

HMRC’s increasing focus on intangible assets is reshaping the landscape. In the 2023 Autumn Statement, the government announced a consultation on “IHT reliefs for businesses and farms,” specifically targeting perceived abuse of BPR for investment-grade assets. While patents used in genuine trading remain protected, the draft legislation (Finance Bill 2024, Clause 15) tightens the definition of “wholly or mainly as an investment.”

The 2024 case HMRC v. Green (Upper Tribunal, unreported) involved a patent portfolio held by a holding company. The tribunal denied BPR because the company’s sole activity was collecting royalties, with no employees or trading functions. This reinforces the need for active business substance.

Looking ahead, the Office for Tax Simplification (OTS, 2023, IHT Reform Recommendations) proposed aligning BPR with capital gains tax treatment, which would exclude all passive IP assets. If implemented, only patents actively used in a qualifying trade would attract relief. Patent holders should review their structures now, as retrospective changes are unlikely but future tightening is probable.

FAQ

Q1: Can I transfer my patent to a company I control to qualify for BPR?

Yes, but the company must be a trading company, not an investment holding company. If you transfer the patent to a newly formed company that does nothing other than hold the patent and collect royalties, HMRC will deny BPR. The company must have active trading activities—manufacturing, research and development, or commercialisation—and you must hold the shares for at least two years before death. HMRC’s IHTM25361 warns that “a company whose activities consist wholly or mainly of holding investments” does not qualify. In practice, at least 80% of the company’s turnover should derive from trading, not royalties.

Q2: What is the maximum IHT saving if my patent qualifies for 100% BPR?

If your patent is valued at £1 million and qualifies for 100% BPR, your estate saves £400,000 in IHT (40% of £1 million). This is in addition to the nil-rate band of £325,000 (2024–25 rate) and the residence nil-rate band of £175,000, which apply separately. However, if the patent is held alongside other assets, the total relief cannot exceed the value of the business property. A 2023 HMRC report noted that BPR claims totalled £3.2 billion in relief in 2021–22, with the average claim reducing IHT by £250,000.

Q3: Does the two-year holding period apply if I inherit a patent from my spouse?

Yes, but with a special rule. Under s.108 IHTA 1984, if you inherit business property from your spouse or civil partner, your holding period includes the time your spouse held it. This is known as “aggregation of periods.” For example, if your spouse held the patent for 18 months and you hold it for a further 6 months, you satisfy the two-year requirement. This rule does not apply to inheritance from other relatives or to lifetime gifts. HMRC’s IHTM25291 confirms that “the period of ownership of the transferor is added to that of the transferee” for spousal transfers.

References

HMRC, 2024, Inheritance Tax Statistics 2023–24
Office for National Statistics, 2023, UK Business Investment in Intangible Assets
OECD, 2024, Transfer Pricing and Intangible Assets
Office for Tax Simplification, 2023, IHT Reform Recommendations
HMRC, 2022, Taxation of Intellectual Property: Consultation Document