AIM ISA Explained

An AIM ISA portfolio or AIM IHT ISA portfolio is a portfolio of AIM shares listed on London’s AIM market, which should benefit from 100% relief from Inheritance Tax (IHT) and is designed to be held in an ISA.

What are the main benefits an AIM ISA?

To quailfy for 100% relief from Inheritance Tax (IHT) your money needs to have been invested in the shares of qualifying AIM companies for at least two years. It should then become IHT free, provided you still hold them on death, and they remain IHT qualifying.

If you are happy to take on additional investment risk, the benefits include:

An AIM ISA portfolio or AIM IHT ISA portfolio is a portfolio of AIM shares listed on London’s AIM market, which should benefit from 100% relief from Inheritance Tax (‘IHT’) and is designed to be held in an ISA.

Why do AIM ISAs get relief from Inheritance Tax?

The portfolios invest in AIM companies that qualify for something called Business Relief, BR for short, which was formerly called Business Property Relief (BPR). If you hold shares in AIM companies that qualify for BR for at least two years and still hold them on your death, no IHT should be due.

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In what kind of companies do AIM portfolios invest?

AIM ISAs invest in AIM companies which qualify for BR.IM is a diverse index, comprising 690 companies and a combined market capitalisation of £70 billion (November 2024). AIM IHT portfolio managers tend to focus on better-established, larger, mature businesses. They should be more resilient and deliver growth but can be quite volatile. When you invest in an AIM portfolio you acquire shares in the underlying companies. (For more information about how AIM ISAs work and how they can be used in financial planning watch our webinar recording- All you need to know about investing in AIM for Inheritance Tax)

How much can I invest in an AIM ISA?

You can transfer unlimited amounts from existing ISAs. The maximum that can be subscribed to an AIM ISA in a given tax year is determined by the ISA allowance at the time – currently £20,000 per individual per tax year. The minimum investment in an AIM ISA IHT portfolio will vary depending on the provider. In some cases, the minimum investment is higher than the current ISA allowance, so the portfolio can only be accessed by transferring existing ISAs.

What to consider when transferring existing ISAs?

If you have built substantial wealth in ISAs over the years, one of the most effective ways to protect it from IHT could be to consider transferring it to an AIM ISA.
The process is relatively straightforward:


Before transferring you should double check what fees you might incur. There are normally no transfer-in fees, but your existing provider(s) may charge transfer-out fees. Moreover, you will be out of the market whilst the transfer takes place so your funds will not be affected by any rises or falls in the period. You can transfer any type of ISA, but please remember AIM ISAs are for experienced investors only. They could be more risky and illiquid than other types of ISA. Before transferring please make sure you are comfortable with the risks.

How to Use AIM For Inheritance Tax Planning Webinar

Could I take an income from an AIM ISA?

You can take money out – even liquidate the whole portfolio. Any withdrawals are tax free.
It’s important to note any withdrawals will reduce the amount you can expect to become IHT free. Moreover, the amount you withdraw will be part of your taxable estate again, unless you spend it. Lastly, after you withdraw money from an AIM ISA, you can only put it back in up to the unused amount of your current ISA allowance. This means you may lose the tax benefits on the amounts withdrawn from your ISA.
Please remember tax benefits depend on circumstances and tax rules can change.

How do I claim AIM ISA tax relief?

Similar to what happens with unquoted IHT portfolios, the executors of the will or administrators of the estate can claim Business Relief when they value the estate. They may have to submit schedule IHT412 (Unlisted stocks and shares and control holdings) in addition to form IHT400 (Inheritance Tax account) and alongside any other forms the estate’s circumstances will require as part of the probate process. Fundamental Asset Management will send details of the investment along with an information pack to help with this.

What happens to my AIM ISA when I die?

IThere are three main options for the executors of the will or administrators of the estate:

If you died within two years of the investment and the portfolio was liquidated, the proceeds could be subject to IHT, unless it is passed on to your spouse or civil partner.

Can I sell my AIM ISA?

One of the main advantages of investing in AIM ISAs over other IHT-planning strategies is the degree of control you can retain. For instance, if your circumstances were to change, it is possible to request the funds. Of course, in this case, you would, however, lose the IHT relief.

What are the main risks of investing in an AIM ISA?

Visit our AIM IHT Portfolios

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AIM IHT Growth Portfolio

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AIM IHT Income Portfolio

Diversified portfolio that invests in the shares of Business Property Relief qualifying AIM companies paying out higher levels of dividends.

*Typical AIM Inheritance Tax portfolio managed by Fundamental Asset Management and held for longer than 5 years.

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