Family Discretionary Trust UK: The Complete Guide for 2026

Most people know they should do something about protecting their assets. Fewer actually do it. And of those who don't, the most common reason isn't cost — it's not knowing where to start.

This guide is the starting point. Everything you need to understand about family discretionary trusts in the UK: how they work, what they protect, what documents you need, and the mistakes that catch people out.

What Is a Family Discretionary Trust?

A family discretionary trust is a legal arrangement where you transfer assets into a trust structure that is held and managed by trustees for the benefit of your beneficiaries — typically your children, grandchildren, or wider family.

The word discretionary is the key. No beneficiary has a fixed entitlement to the trust's assets. Instead, the trustees have discretion over who benefits, how much they receive, and when. This flexibility is what makes discretionary trusts so powerful: the trust can adapt to circumstances you can't predict today — a new grandchild, a beneficiary who needs protecting from a difficult situation, or simply changing family dynamics over decades.

How Does It Work? The Three Parties

Every discretionary trust has three roles:

The Settlor — the person who creates the trust and transfers assets into it. Usually you. You set the initial terms, appoint the trustees, and identify the class of beneficiaries. Once assets are transferred into trust, they are no longer legally yours (which is precisely the point — more on that shortly).

The Trustees — the people who manage the trust. They hold the legal title to trust assets and exercise discretion over distributions. In a family trust, the settlor often acts as one of the trustees alongside a spouse, adult child, or close friend. You're not giving control away — you're building a structure that continues to function if you're incapacitated or gone.

The Beneficiaries — the people who can benefit from the trust. In a discretionary trust, beneficiaries have no automatic right to receive anything; the trustees decide. This is a feature, not a limitation. It means trust assets can't be claimed by a beneficiary's creditors or former spouse as a matter of right.

Key Benefits

Asset Protection

Once assets are properly settled into trust, they are held outside your personal estate. If you face financial difficulty — business debts, personal claims, or insolvency proceedings — assets in trust are generally out of reach. They don't belong to you; they belong to the trust.

The same protection extends to your beneficiaries. Because no beneficiary has a fixed entitlement, trust assets are much harder for a creditor or divorcing spouse to reach. A beneficiary going through a difficult divorce does not automatically hand their solicitor a claim over trust assets — the trustees retain discretion, and that discretion is protected.

Inheritance Tax Planning

Assets held in a discretionary trust are generally outside your estate for inheritance tax purposes, provided the transfer is structured correctly and you don't retain a benefit from the trust. With UK IHT charged at 40% on estates above £325,000 (the nil-rate band, frozen since 2009), this matters more than ever as property values push more families into the IHT net. Understanding the inheritance tax rules for families is essential to structuring your trust correctly from the outset.

Transfers into trust above the nil-rate band may trigger a 20% entry charge. Trusts are also subject to 10-year periodic charges (up to 6% on value above the nil-rate band) and exit charges when assets are distributed. For most family trusts, where assets fall within the nil-rate band, these charges are zero or minimal — and the long-term IHT saving comfortably outweighs them.

Flexibility Across Generations

A discretionary trust can last up to 125 years under the Perpetuities and Accumulations Act 2009. Assets inside the trust don't go through probate on death — they pass seamlessly to the next generation without the delay, cost, or public record of a grant of probate. Set it up today and it can protect your family's wealth through multiple generations.

The TRS Requirement: Registering Your Trust with HMRC

Since 2022, almost all UK trusts must be registered with HMRC via the Trust Registration Service (TRS) — including trusts that have no tax liability.

The TRS is HMRC's register of trusts. Registering requires you to provide details of the settlor, trustees, and beneficiaries. Failure to register, or to keep the registration up to date, can result in financial penalties.

What this means in practice: when you set up your trust, registration with the TRS is not optional — it is a legal requirement in almost all cases. Your Trust Deed should be in place before you register, because the registration requires information from it.

This is a step many self-help guides skip over. Don't let it catch you out.

The Documents You Need

A properly constituted family discretionary trust requires three foundational documents:

1. The Trust Deed

The core legal document. It creates the trust, names the settlor and trustees, defines the class of beneficiaries, and sets out the powers and duties of the trustees. Without a Trust Deed, the trust doesn't legally exist. This is the document you register with the TRS and the document that governs the trust for its entire lifetime.

2. The Letter of Wishes

Not legally binding — but arguably just as important as the Trust Deed. Your Letter of Wishes records your intentions: who you had in mind when you named beneficiaries, how you'd like the trustees to exercise their discretion, what values and priorities should guide decisions. Trustees are not bound by it, but a well-written Letter of Wishes guides them and gives effect to your wishes long after you're gone. It should be updated as your circumstances change.

3. The Nominee Declaration

Where property or other assets are held in someone's name on behalf of the trust, the Nominee Declaration records the true beneficial ownership. This is particularly important for property and shareholdings — without it, the beneficial interest is undocumented and vulnerable if the legal titleholder dies, divorces, or faces a claim.

Common Mistakes to Avoid

Retaining a benefit. If the settlor can benefit from the trust — for example, living in a trust-owned property without paying market rent — the trust may be treated as a "gift with reservation of benefit" under HMRC rules, and the IHT advantages disappear. The trust must be genuinely separate from you.

Not registering with the TRS. As above — registration is mandatory for almost all trusts. It's an administrative step, not a legal one, but skipping it creates real compliance risk.

No Letter of Wishes. Trustees exercise their discretion without context. Twenty years from now, a trustee who didn't know you has no guidance. A Letter of Wishes is the document that gives effect to your actual intentions.

Using outdated template documents. Trust law and HMRC requirements change. Documents drafted five years ago may not reflect current rules. This is especially relevant given the April 2027 HMRC changes to trust reporting requirements — your documents should be current.

Not reviewing the trust as circumstances change. A trust set up when your children were young should be revisited when they become adults. A trust set up before a divorce may need reviewing after. Your Letter of Wishes should be updated regularly.

Get your Family Protection Pack from Heirs & Order™ — from £197. Your Trust Deed, Letter of Wishes, and Nominee Declaration, prepared for your specific family situation and ready to use.

Read next: How to set up a family trust in the UK — or explore how a trust fits into your broader generational wealth plan. For complete family protection, a trust works best alongside a Lasting Power of Attorney — both should be in place before you need them.

This guide is for informational purposes only and does not constitute legal advice. Heirs & Order™ is not a law firm. We recommend all documents are reviewed by a qualified solicitor before use.