Aim Shares After The 2026 Relief Cut: Should Estates Sell, Hold Or Restructure
AIM Shares After the 2026 Relief Cut: Should Estates Sell, Hold or Restructure?
From 6 April 2026, Business Property Relief (BPR) on Alternative Investment Market (AIM) shares was cut from 100% to 50%, regardless of value. The first £2.5 million combined BPR and Agricultural Property Relief (APR) allowance, which applies to other qualifying assets at 100%, does not extend to AIM shares. Under the rules applying in 2026/27, AIM shares attract a flat 50% BPR only, producing an effective Inheritance Tax (IHT) rate of 20% on qualifying AIM holdings rather than the zero rate that applied under 2025/26 rules.
For individuals and estates with substantial AIM portfolios acquired specifically for IHT mitigation, this represents a fundamental change that requires reassessment, not just of the portfolios themselves but of the entire planning structure around them.
What the 2026 Change Actually Did to AIM BPR
The attraction of AIM shares for IHT planning was straightforward under the old regime. Qualifying unquoted shares, including AIM-listed shares that met the trading company conditions, attracted 100% BPR after a two-year holding period. A portfolio of £500,000 in qualifying AIM shares was entirely sheltered from IHT. The investor received market liquidity (AIM shares are tradable) alongside what amounted to full IHT exemption after two years, which no other mainstream asset class offered in the same combination.
The October 2024 Budget removed that combination. Under the HMRC Inheritance Tax guidance on GOV.UK, BPR on AIM shares now operates at 50%, not 100%, and critically this reduced rate applies from the first pound of AIM share value. The £2.5 million combined BPR and APR allowance which gives 100% relief on qualifying business assets does not apply to AIM shares at all. This is confirmed in the Finance Act 2025 provisions.
The practical consequence for a £500,000 qualifying AIM portfolio in 2026/27: £500,000 at 50% BPR leaves £250,000 chargeable to IHT, generating a £100,000 tax liability at the 40% rate (assuming the nil rate band has been used elsewhere). Previously, IHT on that portfolio was nil. The change is not marginal.
The two-year qualifying period requirement remains unchanged. BPR (now at 50%) still requires the shares to have been held for at least two years. Shares held for under two years attract no BPR at all.
Following the landmark April 2026 reforms to Business Property Relief (BPR)—which cut the relief on Alternative Investment Market (AIM) shares to a flat 50%, resulting in an effective 20% Inheritance Tax (IHT) charge—this interactive decision and calculation tool helps UK investors and estate planners evaluate whether to hold, sell, or restructure their portfolios. By entering your portfolio’s current market value and original acquisition cost, the widget compares the exact tax outcomes across each route in real time, contrasting the benefits of the CGT-free uplift on death against the costs of immediate disposal or transitioning into 100% relief alternatives like EIS. Simply adjust the sliders to reflect your holdings and use the built-in diagnostic assessment to determine the most tax-efficient, liquidity-appropriate strategy for your estate.
The Three Options: Sell, Hold or Restructure
The decision facing individuals and estate planners now comes down to three positions, and none of them is straightforwardly right for all situations.
Selling AIM Shares: When This Makes Sense
Selling the AIM portfolio realises Capital Gains Tax (CGT) on any accrued growth. For the 2026/27 tax year, the CGT rate on shares and other assets is 18% within the basic rate band and 24% above it. The Annual Exempt Amount is £3,000.
For an investor who acquired AIM shares purely for IHT reasons and who now holds shares with large embedded gains, selling and reinvesting in a genuinely unconstrained investment strategy may still produce a better net position than continuing to hold for 20% effective IHT on the value. The comparison is between paying 24% CGT now versus deferring that decision and facing 20% IHT later, with the complication that the IHT is applied to total value while the CGT is applied only to growth.
Consider a portfolio held at a cost of £150,000 that is now worth £500,000. CGT on disposal at 24% (for a higher-rate taxpayer) is applied to the gain of £350,000, less the £3,000 AEA: approximately £83,280. IHT on the 50% uncovered portion if the holder dies holding the shares: £100,000. On these numbers alone, selling appears marginally better, and the cash proceeds can be deployed more freely. But this ignores the time value of the IHT liability, which does not arise until death, potentially many years away.
Where the investor has significant unused basic rate band capacity (a common situation for retirees), the 18% CGT rate applies to some or all of the gain, and the sale comparison becomes even more favourable.
Holding AIM Shares: The Case for Remaining Invested
Selling triggers an immediate CGT liability. Holding defers both the CGT (the base cost resets to market value at death, extinguishing any accrued gain) and leaves 50% BPR available against the IHT charge. The CGT-free uplift on death is one of the most powerful reliefs in the UK tax system, and it applies regardless of how long the shares have been held or how large the unrealised gain is.
The effect is that an investor who holds AIM shares until death pays 20% IHT on the qualifying portion, with zero CGT on any lifetime accrued gain. An investor who sells pays CGT now and then has liquid assets in the estate that attract full 40% IHT with no BPR.
This calculation strongly favours holding in most situations where the investor has significant unrealised gains in the portfolio. The tax cost of holding is 20% IHT on the value at death. The tax cost of selling is up to 24% CGT now plus 40% IHT on the net proceeds.
The hold position also preserves optionality. A further reform reducing BPR to nil would change the analysis. But equally, a future change restoring a higher BPR rate (which remains politically possible) would benefit holders. Selling locks in the current tax position and surrenders that optionality.
Restructuring: Alternatives to a Pure AIM Portfolio
The most interesting question for existing AIM portfolio holders is whether there are ways to achieve a better IHT outcome through restructuring rather than simply staying in AIM shares or abandoning them.
One option is diversification into directly held qualifying business property. Unquoted trading company shares, including interests in family businesses, still qualify for 100% BPR within the new £2.5 million combined BPR and APR allowance. An investor with £2.5 million of AIM shares achieving only 50% BPR could replace that exposure with £2.5 million in qualifying unquoted trading company shares (via an EIS or SEIS fund, for example) and achieve 100% BPR. The trade-off is reduced liquidity and potentially higher investment risk.
Qualifying Enterprise Investment Scheme (EIS) shares, which can be held in unquoted trading companies, attract 30% income tax relief on subscription alongside IHT BPR at 100% after two years, within the new £2.5 million allowance. For investors who can tolerate the liquidity and risk profile, EIS shares now offer materially better IHT relief than AIM shares.
Another restructuring option is lifetime gifting with a seven-year clock. An AIM portfolio gifted to adult children as a potentially exempt transfer (PET) starts a seven-year clock. If the donor survives seven years, the gift is outside the estate entirely. No BPR question arises because the shares are no longer part of the donor's estate. The gift itself is not a chargeable disposal for CGT purposes if the shares do not qualify for BADR (Business Asset Disposal Relief), so there is a potential CGT charge at the date of the gift at market value. However, holdover relief is not available for AIM shares gifted to individuals. The donor crystallises CGT at the date of the gift.
Where the donor's life expectancy is genuinely uncertain, the seven-year route is speculative. Where the donor is in reasonable health in their sixties, the arithmetic of paying CGT now to start the seven-year IHT clock may be compelling.
The CGT-Uplift Interaction With the 20% IHT Rate
One of the least-discussed but most important interactions under the new regime is between the CGT base cost uplift at death and the 20% effective IHT on AIM shares. The holder who dies with a large AIM portfolio achieves both the CGT uplift (no CGT on a lifetime gain) and only 20% IHT rather than 40%, because of the remaining 50% BPR. That is a very favourable combination compared with most other asset classes, where 40% IHT applies with a CGT uplift but no BPR.
For context: a property investor dying with £500,000 of investment property (no BPR, no CGT uplift on the embedded gain which is extinguished at death) faces 40% IHT on the estate value after the nil rate band. An AIM investor dying with £500,000 of qualifying AIM shares faces 20% IHT on the shares, with the CGT on the embedded gain fully extinguished. The AIM investor is still in a better position than the property investor in most scenarios, even post-reform.
This comparison matters because some commentary following the October 2024 Budget suggested that AIM shares were now "broken" as an IHT tool. That overstates the case. The relief has been cut, but the combination of 50% BPR plus CGT-free uplift at death remains attractive when compared to alternative asset classes facing the same IHT at 40% with the same CGT-free uplift.
This interactive guide explains the major changes to Business Property Relief on AIM shares that took effect from 6 April 2026, and helps UK taxpayers and estate planners decide whether to sell, hold or restructure their portfolios. It sets out the new 50% relief rules, the 20% effective Inheritance Tax rate, and the continuing value of the capital-gains uplift at death, then compares the three main options side by side. Use the coloured tabs to explore each strategy, adjust the simple calculator with your own portfolio figures, and review the comparison table and key takeaways to see which route may suit your circumstances. The information is presented clearly for non-specialists, but it is general guidance only, always take personal advice before acting.
The Two-Year Rule and Timing Risk for Portfolios in Transition
Investors who purchased AIM shares before April 2026 with 100% BPR in mind now hold shares qualifying for 50% BPR after their two-year holding period. The two-year clock starts from the date of acquisition of each tranche. A share acquired in March 2025 qualifies for 50% BPR from March 2027 onwards (assuming the company still qualifies). A share acquired in March 2024 has been qualifying since March 2026, now at 50% rather than the 100% that was in place for the first two years of holding.
This creates a specific issue for estates where the holder dies within the first two years of holding new AIM shares purchased post-reform. There is no BPR at all on shares held under two years. The 20% effective IHT rate on AIM shares applies only to qualifying holdings; the full 40% rate applies to non-qualifying holdings.
For any investor reinvesting an existing AIM portfolio (for example, by switching between qualifying AIM shares to rebalance the portfolio or respond to company-specific changes), each new acquisition resets the two-year clock on that tranche. Portfolio management that involves regular rebalancing needs to track the acquisition dates of each holding to know which tranches are currently qualifying and which are not.
HMRC's Inheritance Tax guidance on business property relief sets out the conditions for qualifying periods and the treatment of replacement property within AIM portfolios. The replacement property rules under section 107 IHTA 1984 can allow continuity of BPR qualification where one qualifying AIM holding is replaced by another within a portfolio, provided certain conditions are met.
The Periodic Charge Position for AIM Shares in Trusts
For individuals who settled AIM shares into a discretionary trust for IHT planning purposes under the old 100% BPR regime, the trust now faces a different periodic charge calculation at each ten-year anniversary. The trust's own £2.5 million allowance for BPR and APR does not cover AIM shares held in trust, which means AIM shares in trust attract only 50% BPR at the periodic charge date, with the effective periodic charge rate on the uncovered half.
The maximum periodic charge is 6% on the value above the nil rate band. With 50% BPR on AIM shares, the effective periodic charge on AIM holdings is 3% of the total value above the nil rate band, rather than the nil charge that would have applied under the old 100% BPR regime. This is not a catastrophic cost, but it is a change that trustee and settlor should factor into the trust's ongoing economics and consider whether the trust structure still serves its original purpose.
Whether to retain AIM shares in an existing trust or direct the trustees to switch to other qualifying assets that attract 100% BPR within the trust's £2.5 million allowance depends on whether such alternative qualifying assets are available and appropriate for the trust's purposes.
Key Takeaways
From 6 April 2026, qualifying AIM shares attract 50% BPR at a flat rate, producing a 20% effective IHT rate on all AIM holdings regardless of size. The £2.5 million combined BPR and APR allowance does not apply to AIM shares.
The CGT-free uplift at death still applies to AIM shares. An investor dying with qualifying AIM shares pays 20% IHT and no CGT on any accrued gain. This combined position remains more favourable than most alternative asset classes facing 40% IHT.
Selling AIM shares triggers CGT at up to 24% for higher-rate taxpayers. For portfolios with large embedded gains, the case for selling is weaker than it first appears when the CGT-free uplift at death is taken into account.
Restructuring into unquoted trading company shares qualifying for 100% BPR within the new allowance, EIS shares, or lifetime gifting with a seven-year PET clock are the main alternatives for investors seeking to restore the full IHT shelter.
The two-year qualifying rule still applies. Shares held under two years attract no BPR. Portfolio rebalancing resets the two-year clock on newly acquired tranches.
For AIM shares in discretionary trusts, the periodic charge now effectively runs at 3% of values above the nil rate band rather than nil. Trustees and settlors should review whether the trust structure remains optimal.
FAQs
What is the BPR rate on AIM shares in 2026/27?
From 6 April 2026, qualifying AIM shares attract 50% Business Property Relief, producing an effective Inheritance Tax rate of 20% on qualifying holdings. The previous 100% BPR rate no longer applies. The £2.5 million combined BPR and APR allowance does not extend to AIM shares.
Should I sell my AIM shares after the 2026 BPR cut?
Selling triggers CGT, which at 24% for higher-rate taxpayers on large embedded gains can produce a similar or higher immediate tax cost compared with the 20% IHT rate on AIM shares if you hold until death. The CGT-free base cost uplift at death also applies to AIM shares, making the hold position attractive for most investors with significant unrealised gains.
Do AIM shares still qualify for any IHT relief after 2026?
Yes. Qualifying AIM shares (in companies meeting the trading company conditions) still qualify for 50% BPR after a two-year holding period. This is a reduced relief compared to 2025/26 but remains a meaningful benefit not available on most other asset classes.
What is the two-year rule for AIM shares and BPR?
BPR on AIM shares requires the shares to have been held for at least two years at the date of death or transfer. Shares held under two years attract no BPR at all. The 50% BPR rate applies only once the two-year qualifying period has elapsed.
Are there better alternatives to AIM shares for IHT planning now?
Unquoted trading company shares qualifying for BPR within the new £2.5 million combined BPR and APR allowance attract 100% relief rather than the 50% available on AIM shares. EIS investments in qualifying trading companies can also achieve 100% BPR with the additional income tax relief on subscription. Both involve higher illiquidity and investment risk than AIM shares.
What happens to AIM shares in a discretionary trust?
AIM shares held in a discretionary trust attract 50% BPR at the ten-year periodic charge date. The effective periodic charge rate on the qualifying but only partially relieved portion is 3% rather than the nil charge that applied under the old 100% BPR regime. Trustees should assess whether restructuring into other qualifying assets achieving 100% BPR within the trust's own £2.5 million allowance is more efficient.
Does the CGT-free uplift at death still apply to AIM shares?
Yes. When AIM shares pass on death, the base cost for CGT purposes is reset to the market value at the date of death, extinguishing any accrued lifetime gain. This CGT-free uplift is separate from BPR and is unaffected by the 2026 reform. The combination of 50% BPR plus the CGT uplift means AIM shares remain more tax-efficient on death than fully chargeable asset classes.
About the Author:
Adil Akhtar, ACMA, CGMA, FCMA (membership ID is 990250923) serves as CEO and Chief Accountant at Pro Tax Accountant, bringing over 18 years of expertise in tackling intricate tax issues. As a respected tax blog writer, Adil has spent more than eighteen years delivering clear, practical advice to UK taxpayers. He also leads Advantax Accountants (registered with Companies House), combining technical expertise with a passion for simplifying complex financial concepts, establishing himself as a trusted voice in tax education.
Email: adilacma@icloud.com
Disclaimer: This article sets out the general position under UK tax law for the 2026/27 tax year. The information has been checked against HMRC guidance and other official sources at the date shown above, and is reviewed when the rules change. Tax legislation is complex and outcomes depend on your individual circumstances, so this article is provided for general information and does not constitute advice on which you should act. Any figures or worked examples are illustrative. Before making any decision, obtain advice specific to your situation from a qualified professional. Pro Tax Accountant accepts no liability for loss arising from reliance on this article alone.
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