Reducing inheritance tax by investing in AIM shares

The Alternative Investment Market’s (AIM) success over the past year has made it increasingly difficult for equity investors to ignore.

| 4 min read

The Alternative Investment Market’s (AIM) success over the past year has made it increasingly difficult for equity investors to ignore. AIM is the London Stock Exchange’s (LSE) market for smaller, growing companies which are at different stages of development.

Outside of the tech-heavy US indices, AIM’s performance in 2020 outstripped other global benchmarks, achieving growth of c.22%, according to data from Thomson Reuters. Since the early days of AIM, it has transformed and matured; currently, there are approximately 820 companies trading on AIM with a combined market cap of £107billion. Of these, over 240 companies have a market cap in excess of £100million. Many of AIM’s largest constituents would be part of the FTSE250 if listed on the main market. Some of the main attractions to investing in AIM are:

Tax Relief

Without taking the appropriate advice and measures, individuals who have amassed wealth over their lifetime may be at risk of not being able to pass on as much as they hoped to loved ones. 40% inheritance tax is payable on assets over an individual’s nil-rate bands.

Business relief is a statutory relief provided by the UK Government as a way of incentivising investing in specific types of trading companies – including many companies that are quoted on AIM. Once assets qualifying for business relief are held for a minimum of two years, they are exempt from inheritance tax (providing they are still held at the time of death). If the two-year holding period is not met, the surviving spouse or civil partner can inherit the portfolio without restarting the required holding period.

Retain control

Various inheritance tax mitigating strategies involve relinquishing some degree of control and ownership of the assets; to many, this feels uncomfortable and irreversible. When investing directly in AIM, an individual retains full control and has the ability to distribute the income generated, or liquidate part, or all, of the portfolio at any stage. Should their circumstances change there is no penalty for realising the portfolio, other than the normal transaction charges.


Currently, the qualifying period for business relief investments is just two years. Comparatively, a large gift would take seven years to be excluded from an estate for inheritance tax purposes.


AIM shares can be purchased within an ISA. This makes AIM one of the most tax-advantageous markets for investors, as the ISA would be free of income tax, capital gains tax and if held for the requisite two years – inheritance tax.

Power of Attorney

A portfolio of AIM shares can be created under a Power of Attorney or Court Order. The investments would still be held in the beneficial owner’s name.


AIM portfolios are straightforward and do not involve some of the legal complexities of other inheritance tax mitigating tools - such as trusts. The only structural difference between a regular stocks and shares account and an AIM portfolio is that an AIM portfolio holds AIM shares that will hopefully qualify for inheritance tax relief when the holder dies.

The Charles Stanley AIM Service has a proven track record and was named ‘Best AIM Portfolio Service’ at the 2020 Growth Investor Awards. The team invests in companies that have shown consistent and sustainable growth and have simple and scalable business models. The investments are selected by our dedicated AIM team, who have a long track record of generating returns from investing in AIM-quoted companies.

This service should be regarded as high risk because it is exclusively focused on smaller company shares. Share prices on AIM may be more volatile than those on the Official List of the London Stock Exchange and, at times, it may be difficult or impossible to sell such shares.

As this is only one of many tools that can be used to mitigate inheritance tax, Charles Stanley now require that clients seek financial advice, regarding their inheritance tax liability, before opening an AIM portfolio.

Nothing on this website should be construed as personal advice based on your circumstances. No news or research item is a personal recommendation to deal.

Reducing inheritance tax by investing in AIM shares

Read this next

Five tips on how to build your nest egg this Easter

See more Insights

The information in this article is based on our understanding of UK Legislation, Taxation and HMRC guidance, all of which are subject to change. The tax treatment of pensions depends on individual circumstances and is subject to change in future. This article is solely for information purposes and does not constitute advice or a personal recommendation.

More insights

Equity rally continues
By Garry White
Chief Investment Commentator
01 Mar 2024 | 7 min read
War dominating global diplomacy
By Charles Stanley
29 Feb 2024 | 5 min read
Electric cars face a long road to net zero
By Charles Stanley
28 Feb 2024 | 13 min read
US sanctions and Russia's foreign policy battle it out
By Charles Stanley
26 Feb 2024 | 9 min read