Powers of Appointment in a Will UK: General, Special and Hybrid | WillSafe
Updated 18 May 2026 · 7 min read · England & Wales
A power of appointment is a legal mechanism by which one person (the donor) gives another person (the donee) authority to direct property to one or more appointees. Powers of appointment are created in wills and lifetime trusts and are a cornerstone of flexible estate planning in England and Wales — but their Inheritance Tax treatment depends entirely on whether the power is general, special, or hybrid.
What Is a Power of Appointment?
A power of appointment is an authority, conferred by a legal instrument, to dispose of property that the donee does not personally own. Three parties are always involved:
- Donor — the person who creates the power (typically the testator in a will or the settlor in a trust deed).
- Donee — the person who holds and exercises the power (often a trustee or a surviving spouse).
- Appointee — the person(s) in whose favour the power is exercised.
The property subject to the power remains held under the trust or estate until the donee exercises the power. Powers may be testamentary (exercisable only by will) or inter vivos (exercisable during the donee’s lifetime). Testamentary powers are extinguished on death if not exercised, and the property then passes in default of appointment.
Powers of appointment exist on a spectrum from the widest (general) to the most restricted (special), with hybrid powers in between. The classification determines the Inheritance Tax treatment and the limits of lawful exercise.
General Powers of Appointment
A general power of appointment gives the donee authority to appoint property to anyone — including themselves, their own estate, their creditors, or any third party without restriction. The hallmark of a general power is the absence of any meaningful limitation on the class of permissible appointees.
Example clause: “I give my trustees power to appoint the capital of the trust fund to such person or persons as they think fit.” (Where trustees are themselves members of the class, this is a general power.)
IHT treatment: Because the donee can effectively appropriate the property to themselves at will, IHTA 1984 s.5(2) deems the property subject to the general power to form part of the donee’s taxable estate on death. The full value of the appointable fund is aggregated with the donee’s own assets and taxed at 40% above the available nil-rate band. This applies whether or not the power is actually exercised.
For this reason, professionally drafted family trusts almost never confer general powers on trustees — a general power defeats the purpose of keeping assets outside beneficiaries’ estates.
Special Powers of Appointment
A special power of appointment confines the donee to appointing within a defined class of permissible objects. The class is set by the donor in the instrument creating the power. Typical class definitions include:
- The children and remoter issue of the settlor
- The lineal descendants of a named person
- The spouses and civil partners of the settlor’s children
- Any combination of named family members
The donee cannot appoint outside the class — any appointment outside the class is void as an excessive execution of the power.
IHT treatment: Because the donee cannot benefit personally or appoint to their own estate, the property subject to a special power is not included in the donee’s taxable estate. The fund remains outside the donee’s estate for IHT purposes — a significant advantage in multi-generational estate planning.
Special powers are the standard mechanism in discretionary trusts, nil-rate band trusts, and pilot trusts, where maintaining separation between the trustee’s personal estate and the trust fund is essential.
Hybrid (Intermediate) Powers
A hybrid power (sometimes called an intermediate power) permits the donee to appoint to anyone except a specified excluded class. The exclusion is typically:
- The settlor and the settlor’s spouse or civil partner
- The donee themselves
- Any person who has previously received assets from the trust
Example clause: “The trustees may appoint the trust fund to any person other than the settlor, the settlor’s spouse, and any company controlled by either of them.”
IHT treatment: Hybrid powers are treated as special powersfor IHT purposes. Because the donee cannot appoint to themselves or their estate, the property does not form part of the donee’s taxable estate — the same favourable treatment as a special power applies.
Hybrid powers offer greater flexibility than special powers (the class of permissible appointees is much wider) while retaining the IHT advantage of keeping the fund outside the donee’s estate.
General vs Special vs Hybrid: Comparison
| Feature | General power | Special power | Hybrid power |
|---|---|---|---|
| Definition | Donee can appoint to anyone, including themselves and their own estate | Donee can only appoint within a defined class set by the donor | Donee can appoint to anyone except a defined excluded class |
| Who can be appointed | Anyone — no restriction on appointees | Only members of the specified class (e.g. the settlor’s children) | Anyone except the excluded class (e.g. anyone other than the settlor and spouse) |
| IHT treatment | Included in donee’s taxable estate (IHTA 1984 s.5(2)) | Outside donee’s estate — no IHT exposure for the donee | Treated as special power — outside donee’s estate |
| Typical use | Rarely used in modern trust drafting; sometimes in personal representative powers | Discretionary trusts, nil-rate band trusts, pilot trusts | Flexible family trusts where a wide class is desired while preserving IHT efficiency |
How Powers Are Exercised in a Will
A testamentary power of appointment is one that can only be exercised in a will (or codicil) — the instrument creating the power specifies that the donee must exercise it by testamentary disposition. Some powers are exercisable inter vivos as well as by will; others are exclusively testamentary.
Wills Act 1837 s.27 is the governing rule: a general devise or bequest in a will does not exercise a testamentary power of appointment unless the will expressly refers to the power or shows by necessary implication an intention to exercise it. This reversed the pre-1837 common law presumption that a residuary clause swept up all powers.
In practice, a will exercising a power should include express language such as:
“In exercise of the power of appointment conferred on me by clause 4 of the Will of [Donor] dated [date], I appoint the sum of [£X / the whole trust fund] to [Beneficiary] absolutely.”
Where a power permits appointment among a class, the exercise must stay within that class. The donee may appoint the whole fund to one member, divide it among several members, or impose conditions — provided those conditions are within the scope of the power.
Failure to exercise: If the donee dies without exercising a testamentary power, the power lapses and the property passes in default of appointment as specified in the instrument that created the power.
Release, Disclaimer, and Excessive Execution
Three doctrines govern the limits of a donee’s interaction with a power:
- Release — the donee permanently surrenders the power. Once released, the power cannot be revived. The property passes as if the power had never existed, or as directed by any default clause. A trustee releasing a power should do so by deed and take advice to ensure no breach of fiduciary duty.
- Disclaimer — the donee refuses to take up the power from the outset. Unlike release, disclaimer occurs before the power is accepted, and the donee is treated as never having held it.
- Excessive execution — the donee purports to appoint outside the permitted class or for an improper purpose. An appointment outside the class is wholly void (or void as to the excess). Courts apply the fraud on a powerdoctrine: any exercise of a power for a purpose that lies outside the scope for which the power was conferred is voidable, even if the appointee is technically within the class. Classic examples include appointing to a class member under a secret arrangement to benefit a non-class member, or using the power primarily to benefit the donee personally when the power is a special power.
The fraud on a power doctrine does not require dishonesty in the ordinary sense — it applies wherever the dominant purpose of the exercise is improper relative to the power’s scope.
Practical Estate Planning Uses
Powers of appointment are one of the most versatile tools in estate planning. Their principal practical applications include:
- Building flexibility into discretionary trusts — rather than fixing beneficial interests at the date of the will, a special power of appointment allows trustees to adjust distributions after death in response to changing family circumstances (births, divorces, financial hardship, disability).
- Adapting to tax law changes — a power of appointment held by trustees permits beneficial interests to be restructured if IHT reliefs, nil-rate bands, or trust tax rules change without the need for a court order or deed of variation.
- Post-death adjustment without a deed of variation — where trustees hold a special power of appointment, they can redirect beneficial interests within the two-year period (or beyond) without the formalities and cost of a formal deed of variation under IHTA 1984 s.142.
- Nil-rate band discretionary trusts — a common structure in which assets up to the available nil-rate band pass into a discretionary trust on the first death, with trustees holding a special power of appointment over those assets. The surviving spouse can be a member of the class without causing the assets to form part of their estate for IHT (provided the interest is purely discretionary, not a qualifying interest in possession).
- Pilot trusts — small trusts established during the testator’s lifetime to receive assets by will, often used to hold multiple nil-rate bands. A special power of appointment within the pilot trust gives the trustees flexibility to benefit a wide range of family members.
- Protecting vulnerable beneficiaries — where a beneficiary has a disability or is at risk of bankruptcy, a special power of appointment ensures benefits can be withheld or directed to a carer or other family member rather than passing automatically to the vulnerable beneficiary’s creditors.
Frequently asked questions
What is the difference between a general and special power of appointment?
A general power of appointment allows the donee (the person holding the power) to appoint property to anyone at all — including themselves, their own estate, or their creditors. Because the donee has unfettered control, the law treats the property as part of their own estate for Inheritance Tax purposes under IHTA 1984 s.5(2). A special power of appointment is more restricted: the donee can only appoint within a defined class of objects, such as 'the children of the settlor' or 'the lineal descendants of X'. Because the donee cannot benefit personally and cannot appoint outside the class, the property is not included in the donee's taxable estate — it remains outside their estate for IHT. The distinction has major tax consequences and is the primary reason special powers are favoured in family trust planning.
Does a general power of appointment increase IHT liability?
Yes. Under IHTA 1984 s.5(2), property subject to a general power of appointment is treated as forming part of the donee's estate for Inheritance Tax purposes. This means that if a person holds a general power of appointment over a fund — even if the fund is technically owned by a trust — the value of that fund is aggregated with the rest of the donee's estate for IHT on their death. If the donee exercises the power in their will (or fails to exercise it, causing it to lapse to their estate), the full value is subject to IHT at 40% above the nil-rate band. This is why professionally drafted trusts invariably confer special (rather than general) powers of appointment on trustees: to keep the trust property outside beneficiaries' estates.
How must a power of appointment be exercised in a will?
A testamentary power of appointment — one that can only be exercised by will — must be exercised in a duly executed will or codicil. A general devise or bequest in a will does NOT automatically exercise a testamentary power of appointment unless the will expressly refers to the power or clearly shows an intention to exercise it: Wills Act 1837 s.27 reversed the old common law presumption that a residuary clause exercises all powers. In practice, the will should contain a clause such as: 'In exercise of the power of appointment conferred on me by the [Trust Deed / Will of X], I hereby appoint the sum of £X / the trust fund to [beneficiary].' Failure to exercise the power means the property passes in default of appointment — typically back to the settlor's estate or as specified in the trust deed.
What happens if a power of appointment is not exercised?
If a power of appointment is not exercised (either deliberately or by oversight), the property subject to the power passes 'in default of appointment'. The default destination is set out in the instrument creating the power — for example, the trust deed or the original will. Common default provisions include: (1) the trust fund falls back into residue; (2) the property passes equally among a defined class (e.g. equally among the settlor's children); (3) the property reverts to the settlor's estate. If there is no express default provision and the power is a special power, the property is held on resulting trust for the settlor or the settlor's estate. Failure to exercise a power — particularly a testamentary power that expires on death — is irreversible, which is why estate planners review outstanding powers as part of will reviews.
Can a trustee appoint property to themselves?
It depends on the type of power and the terms of the trust. Under a special power, the donee (trustee) can only appoint within the defined class of beneficiaries. If the trustee is not within the class, they cannot appoint to themselves — any such appointment would be void as excessive execution. If the trustee is within the class (for example, an adult child who is also a trustee), they can in principle be appointed to, but must take care: a trustee who benefits personally from a power exercised in their own favour may be in breach of fiduciary duty unless the trust instrument expressly authorises self-benefit. Under a general power, the donee can appoint to themselves. However, general powers are rarely conferred on trustees in discretionary trusts precisely because they collapse the distinction between trustee and beneficiary and create IHT exposure.
What is 'fraud on a power' and when does it apply?
Fraud on a power is an equitable doctrine that renders void (or voidable) any exercise of a power that is carried out for a purpose outside the scope and intent of the power. The term 'fraud' does not require dishonesty — it simply means the power has been used for an improper purpose. Classic examples include: (1) A trustee exercising a special power to appoint property to a beneficiary within the class, but under a side-arrangement that the beneficiary will pay part of the appointed funds to a person outside the class (effectively appointing outside the class indirectly). (2) Appointing to a class member as a reward or inducement for something unrelated to the trust purpose. (3) Using a power to benefit the donee personally when the power is a special power. The court will set aside the appointment if the dominant purpose was improper — even if the appointee is technically within the class. The doctrine is most frequently litigated in family trust disputes and contentious probate proceedings.
Add Flexibility to Your Estate Plan
Powers of appointment — properly drafted — allow your trustees to adapt your estate plan to circumstances you cannot foresee. WillSafe’s guided will writing process covers discretionary trusts, trustee powers, and IHT planning for England and Wales.
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