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Inheritance tax: an overview

Date: 15 October 2025

4 minute read

The Office for Budget Responsibility (OBR) has forecast that inheritance tax (IHT) will add £9.1bn to the UK Treasury’s coffers in 2025-26. That represents a sharp increase on the (by comparison) measly looking £2bn raised back in 1999-2000. Crucially, the OBR graph below shows that the overall IHT bill is expected to continue its upwards trajectory in the years ahead, reaching £14.3bn in 2029/2030, near enough double the £7.5bn death duties raised in 2023-2024.

It’s easy to see why the IHT tax take is forecast to keep on rising: asset price inflation; the seemingly permafrozen state of the nil rate and residence nil rate bands; recent cuts to existing reliefs, such as agricultural and business property reliefs; and the adding of unused pension pots to estates for IHT calculation purposes.  In short, more and more estates are finding themselves caught in the ever-widening reach of IHT.

The voluntary tax

All is not lost to the taxman, however.  For IHT is also known as the ‘voluntary tax’, and for good reason or, to be more precise, for 95 good reasons - 95 is the number of tax reliefs which can be used to reduce a potential IHT liability.

In 2015, the now disbanded Office of Tax Simplification estimated there were 94 tax reliefs for IHT, while in 2017 the residence nil rate band was introduced, bringing the total number up to 95. 

From utilising relevant reliefs and gifting allowances, such as potentially exempt transfers (PETs) and chargeable lifetime transfers (CLT), to establishing trusts and making charitable donations, there’s no shortage of action that can be taken to help reduce a future IHT liability.

Beware Newton's Third Law of Motion

Trouble is, those 95 individual reliefs bring their own set of issues. Firstly, chances are not everyone will be able to name more than a dozen or so of the reliefs, let alone all 95. Even if they could, the next challenge is to understand fully what the reliefs mean, who they are most relevant to, when they can be utilised and what happens to their effectiveness when combined with other IHT mitigation measures. In line with Newton's Third Law of Motion, where equal and opposite forces result in a net force of zero, two separate actions taken can cancel each other out.

A question of trust

And then there are trusts. While the majority of these fall under one of two types – bare or discretionary – there are many variations of trusts to cater for a settlor’s objectives (the settlor being the individual wishing to mitigate a possible future IHT liability so that more of his or her wealth can be transferred to loved ones). Assuming trusts are deemed to be suitable for the client, a one size fits all trust solution does not exist. Tailored strategies are required.

Financial advisers have a key role to play here. The various reliefs, trusts, and forms of giving are all highly effective tools for IHT planning, but only if clients or executors of estates are aware of them. If they are not, reliefs won’t be claimed, optimal strategies won’t be adopted and potential IHT liabilities won’t be minimised. Financial advisers have the knowledge, experience and expertise to help organise estates effectively. As well as knowing which reliefs are available or which trusts would best match a specific objective, advisers will be able to explain the control and tax implications of any actions taken. 

As with all strategies, the process starts by gaining an in-depth understanding of the wishes of the client. Once this is in place, a suitable and effective plan can be designed and then executed. IHT planning, however, does not end with the roll out of a bespoke solution.

Regular reviewing is required to ensure IHT strategies remain fit for purpose in a constantly changing tax environment. IHT is a major earner for the government. Together with the Great Wealth Transfer that is currently underway, whereby Baby Boomers are passing on their wealth to the next generation, further changes to the IHT landscape can be expected, changes that would, more likely than not, make the world of IHT even more complex than it is today.

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