BPR and IHT Planning with AIM: A Practical UK Guide

For several decades, Business Property Relief (BPR) has been a central feature of Inheritance Tax (IHT) planning in the United Kingdom. It has permitted the transfer of business assets, including shares in unquoted companies and those listed on the Alternative Investment Market (AIM), free from IHT. This has been critical for both family business succession and for retail investors using AIM portfolios for estate planning.

The position is now set for a significant change. The Autumn 2024 Budget introduced substantial reforms that will take effect from 6 April 2026. These changes curtail the unlimited nature of the relief, introducing a cap and differentiating the treatment of AIM-listed shares. For individuals and families with significant holdings in qualifying business assets, these reforms necessitate an urgent review of existing estate plans.

This article examines the specifics of the 2026 reform of Business Property Relief. We will analyse the mechanics of the new system, its direct impact on the effective tax rate for AIM IHT portfolios and unquoted trading companies, and the strategic planning considerations that investors and business owners must now address.

To appreciate the scale of the upcoming change, it is important to understand how BPR operates today. Under the rules laid out in the Inheritance Tax Act 1984, BPR provides 100% relief from IHT on the value of relevant business property, provided it has been owned for at least two years at the time of death.

The relief was designed to prevent the break-up of viable trading businesses in order to settle an IHT liability. Qualifying assets include shares in an unquoted trading company, a business or an interest in a business (such as a partnership), and, crucially for many investors, shares in companies listed on London's AIM. This last category has given rise to a significant industry of managed AIM IHT portfolios, which have become a mainstream tool for estate planning.

The current system is notable for its simplicity and generosity. There is no cap on the value of assets that can qualify for 100% relief. An individual with a £5 million portfolio of qualifying AIM shares or a shareholding in a family trading company of the same value could, after the two-year qualifying period, pass on the entire amount free of IHT. This has made BPR one of the most powerful estate planning reliefs available.

The reforms scheduled for implementation on 6 April 2026 fundamentally reshape the application of BPR. The principle of unlimited 100% relief will cease. The new framework introduces a capped, two-tier system for most business assets and a separate, less generous regime for AIM-listed shares.

The primary changes are as follows:

• A Capped Relief System: For unquoted trading companies and other core BPR assets, 100% relief will be capped at a total value of £1 million per person. This cap is combined with Agricultural Property Relief (APR). Any value of qualifying assets held above this £1 million threshold will receive relief at a reduced rate of 50%.
• Reduced Relief for AIM Shares: Shares in companies listed on the AIM will no longer be eligible for the £1 million 100% relief allowance. Instead, they will receive a flat rate of 50% BPR from the first pound of value.

One critical element remains unchanged: the two-year minimum holding period required to qualify for the relief. Assets must still be owned for at least two years leading up to the date of death to be eligible for any level of BPR. This preservation provides a degree of continuity, but the value of the relief itself is substantially reduced for larger estates.

The most immediate consequence of the reforms is the re-introduction of an IHT liability on significant holdings that were previously fully shielded. The era of passing on multi-million-pound business asset portfolios with a 0% IHT charge is over. The headline 40% IHT rate will now apply to a portion of these assets, creating potentially significant tax liabilities that estates must be prepared to meet.

For investors in AIM IHT portfolios, the change is stark. A strategy that previously offered complete IHT exemption will now, at best, result in an effective tax rate of 20% on the entire portfolio's value. This fundamentally alters the risk-reward calculation of using AIM shares for estate planning, especially given the inherent volatility of smaller-company equities.

For owners of unquoted and family-run trading companies, the impact depends on the scale of the business. For enterprises valued below £1 million, the situation is largely unchanged. However, for companies with a value exceeding this new cap, families must now plan for an IHT liability on the 'excess' value. This re-opens challenges around liquidity and succession that BPR was originally created to solve, albeit for a smaller portion of the business's value.

The new rules present a direct challenge to the business model of specialist AIM IHT portfolio managers. Firms such as Octopus Investments, Unicorn Asset Management, Puma Investments, Stellar Asset Management, Downing, RC Brown Investment Management, and Time Investments have for years offered products based on the core proposition of 100% IHT relief after a two-year holding period.

From April 2026, this proposition is fundamentally altered. With relief for AIM-listed shares halved to a flat 50%, the remaining 50% of the portfolio's value becomes subject to IHT at the standard 40% rate. This translates to an effective tax rate (ETR) of 20% on the total value of the portfolio (50% of asset value x 40% tax rate). A £2 million AIM portfolio, which would have passed tax-free pre-reform, will now generate a £400,000 IHT liability.

This change requires a profound strategic recalibration for investors. The investment case no longer rests solely on tax exemption but on a combination of reduced tax liability and potential for capital growth. Investors must now weigh a 20% ETR against the investment risk of holding a portfolio of smaller, often less liquid, public companies. The appeal of these portfolios compared to other estate planning strategies has been materially diminished.

For owners of private trading companies, the introduction of the £1 million cap complicates succession planning. While many smaller businesses fall entirely within this allowance, a significant number of successful family enterprises will exceed it. The interaction of the new BPR rules with existing IHT allowances is now a critical calculation.

An individual's estate is first entitled to a nil-rate band (NRB) of £325,000 and may also benefit from a residence nil-rate band (RNRB) of £175,000 if passing a main residence to direct descendants. Consider an estate with a qualifying trading company valued at £4 million. The first £1 million of company value receives 100% BPR. The subsequent £3 million receives 50% BPR, leaving £1.5 million assessable for IHT. After applying the combined £500,000 NRB and RNRB, the remaining £1 million would be taxed at 40%, creating a £400,000 liability.

This calculation demonstrates that even with partial relief, substantial tax bills can arise. This brings the issue of liquidity back into focus for the business and its inheritors. The need to fund an IHT payment could put pressure on the company's cash reserves or force the sale of a portion of the business, reviving the very problem BPR was created to solve, though on a more limited scale.

In light of the 2026 changes, investors and business owners must consider proactive planning measures to mitigate their new, higher potential IHT exposure. There is no single solution, and the appropriate strategy will depend on individual circumstances, risk tolerance, and the nature of the assets.

One of the most direct responses is to make lifetime gifts of shares. Gifting shares in a qualifying company is a Potentially Exempt Transfer (PET). Provided the donor survives for seven years after the gift, its value falls completely outside their estate for IHT purposes. This strategy effectively 'starts the clock' on removing value from the estate, but it does involve a complete loss of control over the gifted assets.

Another common strategy will be to use insurance to cover the projected liability. A 'whole of life' insurance policy written into trust can provide a lump sum on death, which can be used by the beneficiaries to pay the IHT bill without needing to sell business assets. This provides liquidity and preserves the integrity of the business, but it requires ongoing premium payments. For some, reorganising business assets into a Family Investment Company (FIC) may offer greater long-term flexibility for succession, although FICs themselves hold investments and do not typically qualify for BPR.

As the tax advantages of holding BPR-qualifying assets are diluted, particularly for AIM portfolios, investors may redirect capital towards other government-approved schemes. The most prominent among these are the Enterprise Investment Scheme (EIS) and Venture Capital Trusts (VCTs).

EIS investments offer several tax reliefs, including 30% income tax relief on the amount invested (up to £1 million per year, or £2 million for knowledge-intensive companies). Crucially, shares in an EIS-qualifying company become 100% exempt from IHT after being held for two years, as they typically qualify for BPR. The new £1m BPR cap will apply to these holdings, but they may offer a more attractive entry point given the upfront income tax relief. They do, however, represent investments in very early-stage, high-risk unquoted companies.

VCTs, by contrast, are themselves tax-efficient investment companies listed on the London Stock Exchange. They offer 30% upfront income tax relief and all dividends and capital gains are tax-free. While the capital itself is not exempt from IHT during the investor's lifetime, any shares held at death are free from IHT. VCTs provide diversification across a portfolio of early-stage companies, managed by a professional fund manager, which can mitigate some risk compared to a direct EIS investment. Both schemes, however, are designated as high-risk by the Financial Conduct Authority (FCA) and are not suitable for all investors.

The reforms to Business Property Relief taking effect in April 2026 mark a significant policy shift. The relief, once a tool for complete IHT exemption on unlimited business assets, is being reshaped into a more constrained measure, albeit still a valuable one. Its primary function now is to provide a substantial, but not total, level of support for family businesses and investors in qualifying assets.

The era of relying on BPR for a zero-IHT outcome on large portfolios is ending. For AIM IHT portfolio investors, the new 20% effective tax rate demands a careful reassessment of strategy. For owners of trading businesses valued at over £1 million, planning for IHT liquidity is once again a necessary discipline. The changes will compel investors and their advisers to engage in more sophisticated, multi-faceted estate planning, combining capped BPR with other tools such as gifting, trusts, life insurance, and potentially higher-risk schemes like EIS and VCTs.

Ultimately, BPR remains an important part of the IHT planning toolkit. However, from 2026, it must be viewed not as a complete solution in itself, but as a component within a broader, more diversified strategy for managing wealth transfer to the next generation.