Residuary Discretionary Trusts

Something about the Will feels wrong, even on a second read. Instead of "I leave my estate equally to my children", the residue (everything left after debts, expenses and any specific gifts) goes to "my trustees to hold on discretionary trusts" for a list of possible beneficiaries: the spouse, children, grandchildren, perhaps others. Nobody is actually given anything. The family wants to know who inherits, and the honest answer on the face of the Will is: whoever the trustees decide.

That can feel unsettling, even hurtful, at a raw time. But a residuary discretionary trust is almost never a sign of distrust or a drafting error. It is a deliberate structure chosen for flexibility and protection, and it usually comes with a private letter telling the trustees what the deceased hoped would happen. There is also a strict clock running: decisions made within two years of death can be treated, for Inheritance Tax, as if the Will itself had said so. This factsheet explains the structure and the steps to take now.

What a residuary discretionary trust is

A discretionary trust is a trust in which the trustees (the people who legally hold and manage the assets) decide which members of a defined class of beneficiaries (the group of people capable of benefiting) receive money, how much and when. No beneficiary has an automatic entitlement; they have only the right to be considered.

When the trust covers the residue of the estate, the trustees end up holding most or all of what the person owned. Their decisions are made formally, usually by a deed of appointment (a signed legal document recording a decision to give trust assets to a beneficiary).

Nearly every such Will is accompanied by a letter of wishes: a confidential, non-binding note in which the person who died explains who they really wanted to benefit, in what circumstances and why. Finding that letter is one of your first jobs. Conscientious trustees follow it unless there is good reason not to.

Why people set up residuary discretionary trusts

Protection of beneficiaries. Money held at the trustees' discretion is not a beneficiary's property until they receive it. That matters enormously if a beneficiary is going through a divorce, facing bankruptcy, struggling with addiction or not yet ready to handle a large sum. Trustees can wait, drip-feed or support a beneficiary indirectly.

Means-tested benefits. A vulnerable beneficiary who inherits outright can lose means-tested support. A discretionary structure means there is no entitlement to be counted, and the trustees can provide for them carefully. (For some disabled beneficiaries a specific disabled person's trust may be more tax-efficient; advice is needed.)

Second marriages and complicated families. Where fixed shares risk inflaming tensions, or the right division genuinely depends on circumstances at death, discretion lets the trustees respond to the family as it actually is.

Flexibility and post-death tax planning. Because of the two-year rule, a discretionary residue lets the trustees effectively finish writing the Will after death, with full knowledge of the tax rules, the family's needs and the size of the estate.

Older nil rate band planning. Many Wills written before October 2007 contain a discretionary trust of the nil rate band (the £325,000 IHT-free allowance, frozen until April 2031), created when a spouse's unused allowance could not be transferred. Many are now redundant, but they still take effect and need the same two-year review.

The two-year window: section 144 IHTA 1984

Under section 144 of the Inheritance Tax Act 1984, where trustees appoint assets out of a discretionary Will trust within two years of the death, the appointment is "read back" into the Will for IHT purposes: tax is charged as if the Will had left the assets that way, and the appointment itself triggers no exit charge. This is the single most important thing for trustees of a discretionary Will trust to understand.

Within the window, the trustees can:

• appoint capital outright to one or more beneficiaries, so it is taxed as if the Will had left it to them
• appoint to a surviving spouse or civil partner and secure the spouse exemption
• appoint the family home to a direct descendant so the estate can claim the residence nil rate band, which residue held on discretionary trusts otherwise loses
• appoint onto a different kind of trust instead, for example a life interest trust or an 18 to 25 trust
• appoint to charity, and where at least 10% of the taxable estate goes that way, bring the whole estate's rate down from 40% to 36%
• appoint part and leave the rest running, which is often the right answer where one beneficiary needs protection and another does not

One timing trap. An appointment in favour of a surviving spouse made within the first three months after death can fail to qualify for read-back (the Frankland trap), forfeiting the spouse exemption. The safe corridor is generally after three months and well before the second anniversary. Take advice before signing anything.

And one tax boundary. Read-back applies for Inheritance Tax only. Capital gains tax is worked out separately, and appointing assets that have risen in value since death can trigger a CGT charge; take advice before choosing which assets to appoint.

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How the trust is taxed if it carries on

A discretionary trust is a relevant property trust (the IHT regime applying to trusts where no one has a fixed entitlement), and it is within that regime from the date of death, not from the second anniversary. What the second anniversary takes away is the read-back opportunity, nothing more and nothing less. If the trustees keep the trust running:

• Ten-year anniversary charges of up to 6% of the value above the trust's available nil rate band, calculated on each tenth anniversary of the death.
• Exit charges when capital leaves after the first two years, worked out from the rate at the last anniversary and the number of complete quarters since. A trust worth less than the nil rate band usually pays nothing.
• Income Tax at 45% on most income and 39.35% on dividends, with a tax-free amount of normally £500.
• Capital Gains Tax with a trustees' annual exempt amount of £1,500 for 2026 to 2027, and 60 days to report and pay on a UK residential property sale.
• Registration and returns: the Trust Registration Service entry kept up to date, and a Trust and Estate Tax Return where one is due.

These charges are often a price worth paying for the protection, but they should be a decision, not an accident. Review the trust before each ten-year anniversary.

What executors and trustees need to do now

1. Write two dates at the front of the file. The date three months after the death, before which an appointment to a surviving spouse can fail. And the second anniversary, after which read-back is gone for good. Everything else works backwards from those two.
2. Find the letter of wishes. Ask the family, ask the firm that drafted the Will, and check the deed packet. It is the closest you will get to the person who died telling you what they wanted.
3. Establish who is actually in the class, and how they are. Ages, health, marriages, divorces, debts, benefits, businesses. Discretion can only be exercised properly if you know the facts as they are now, not as they were when the Will was signed.
4. Get the estate valued and the Inheritance Tax settled, so you know the size of the fund you are making decisions about. Appointments planned on estimates tend to be appointments made twice.
5. Hold a first trustees' meeting and minute it. Record who you considered, what you took into account and why you decided as you did. That minute is your protection if a disappointed beneficiary complains years later.
6. Take advice before you sign any appointment. Who, how much, in what form, and which specific assets. Read-back is an Inheritance Tax rule only, so the Capital Gains Tax position on the assets you move has to be checked separately.
7. Check the residence nil rate band position on its own. A home sitting in a discretionary trust does not qualify. If it is meant to reach children or grandchildren, it has to be appointed to them inside the two years.
8. Decide whether the trust will outlive the window. If it will, register it with HMRC's Trust Registration Service, open a trust bank account and stop using the estate account for anything.
9. Diarise the ten-year anniversary from the date of death, and put an annual review in the calendar. A discretionary trust nobody looks at is where the costs quietly build up.

A worked example

David, a widower, dies leaving a residuary estate of £540,000 on discretionary trusts for his two adult children and his grandchildren, with a letter of wishes asking the trustees to treat the children equally "when sensible". His home was sold during his lifetime, so the residue is cash and investments and no residence nil rate band question arises here. Where a home does fall into a discretionary residue, it is the first thing the trustees have to deal with, because the allowance is only preserved if the property is appointed to a child or grandchild within the two years. His daughter is financially settled; his son is mid-way through contested divorce proceedings. Six months after death, the trustees appoint half the fund outright to the daughter; under section 144 that is read back into the Will, as if David had left it to her directly. The son's half stays in the trust, out of the matrimonial pot, and the trustees register it on the Trust Registration Service. Three years later, with the divorce settled, they appoint the remaining fund to the son. Because the daughter's half was read back into the Will under section 144 and so never became relevant property, the settlement counts as having started at £270,000, which is below the £325,000 nil rate band. The effective rate is nil and no exit charge arises. Had the fund started above the nil rate band, there would have been a charge, which is why trustees work the figure out before every distribution rather than after. This is a hypothetical example for illustration only.

Common mistakes

Letting the two years drift past. Grief, probate delays and indecision eat the window quickly. The trust has been in the relevant property regime since the death; what vanishes at the second anniversary is the read-back opportunity, and it cannot be revived.

Appointing to a spouse in the first three months. The Frankland trap can cost the entire spouse exemption. The dates are technical; ask a STEP-qualified adviser to check the timing.

Treating the letter of wishes as either binding or irrelevant. It is neither. Trustees should give it serious weight while still exercising their own judgment.

Missing the trust register. A trust that runs on beyond the two-year window has to be registered with HMRC, and trustees who assumed probate was the end of the paperwork are exactly the people who miss it. Our Trust Administration factsheet sets out the deadlines, the exclusions and the penalties.

Assuming the discretionary trust itself saves tax. Residue into a discretionary trust gets no spouse exemption and can lose the residence nil rate band. The tax efficiency comes from what the trustees do within two years.

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Trust planning should always follow personal advice.

This factsheet is general information for England and Wales, not legal, tax or financial advice. Last reviewed: August 2026.