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Understanding Trust Tax on UK Will Trusts and Inheritances

19 July 2026
Sovereign Planning
7 min read
Understanding Trust Tax on UK Will Trusts and Inheritances

Protecting Your Legacy From Hidden Tax Pitfalls

A lot of families worry that whatever they leave behind will be swallowed up by tax before it reaches their loved ones. For many people, the main family home and years of careful saving are at stake. Trust tax for UK will trusts can feel confusing, but getting to grips with the basics can make a real difference to how much your family actually receives.

Trusts can help protect what you have built, but they must be set up and worded in a way that fits the tax rules. The good news is that a clear plan, reviewed regularly, can reduce risk and keep your wishes on track. Midway through the year is often a sensible time to look at your will, trusts and wider estate planning, before the usual end of year reviews with accountants and advisers.

At Sovereign Planning, we focus on will writing, will trusts, lasting powers of attorney and trust planning across the UK. We work with families who want straightforward explanations, careful documents and practical guidance, usually in the comfort of their own homes.

How UK Will Trusts Work in Real Life

A will trust is a way of leaving your assets so that they are held and managed by trustees for the benefit of someone else. Instead of simply saying “everything to my spouse” or “everything equally to my children”, a will trust puts an extra layer of control and protection around what you leave.

Common types of will trust used for family planning include:

  • Discretionary trusts, where trustees decide which beneficiaries benefit, when and how much  
  • Life interest trusts, where one person has the right to income or to live in a property for life, but the capital passes to others later  
  • Trusts for minors or vulnerable people, where someone may not be ready or able to manage money themselves  

A typical example is when the family home is placed in a life interest trust. The surviving spouse can live in the property for the rest of their life, but the underlying capital is reserved for the children. This can help guard against the risk of the survivor remarrying or changing their will later, or the house being lost completely to care fees or claims.

Used carefully, will trusts can:

  • Keep a roof over a surviving partner’s head  
  • Protect children from a previous relationship  
  • Give structure when beneficiaries are young or struggle with money  
  • Balance fairness between different branches of a family  

The tax rules must still be respected, but they sit alongside these personal aims rather than replacing them.

Key Trust Tax Rules Every Family Should Know

Many will trusts, especially discretionary ones, are treated as “relevant property” trusts for inheritance tax (IHT) purposes. This means they are not taxed only when someone dies, but can face charges while the trust is running.

There are three main pressure points for IHT on relevant property trusts:

  • Entry charges when assets are first placed into the trust during lifetime  
  • Ten-year, or “periodic”, charges on each tenth anniversary of the trust  
  • Exit charges when assets leave the trust or are appointed out to beneficiaries  

For will trusts that only come into effect on death, the “entry” is usually part of the estate on that death. How much tax the trust faces later depends on how far the estate has used up the IHT allowances, mainly:

  • The nil rate band  
  • The residence nil rate band, in some cases where a home passes to direct descendants  

If the value going into trust fits within the available allowances, later ten year and exit charges can be reduced or sometimes avoided. If those allowances are already fully used, the trust may face higher IHT percentages at those key points.

It is also important to remember that tax is only one part of the story. The legal wording of the will and trust must be clear, workable and properly signed. A tax-efficient trust that does not actually do what you want for your family is not a good result.

Income Tax and Capital Gains on Trust Assets

A trust is often treated as its own “person” for income tax and capital gains tax (CGT). The trustees may have to file tax returns and pay tax, separate from the people who benefit.

Trust income might include:

  • Rent from a property owned by the trust  
  • Interest from savings and bonds  
  • Dividends from company shares  

Different rates can apply to different types of income, and discretionary trusts often face higher rates once income passes a certain level. When trustees pay out income to beneficiaries, that income may carry a tax credit or may need to be reported by the beneficiary on their own return.

For CGT, trusts usually have a smaller annual exemption than individuals. Gains can be triggered when:

  • Trustees sell or transfer a property or investment that has risen in value  
  • Assets are restructured, for example moving from one type of investment to another  
  • Property is appointed out to a beneficiary at a higher value than when it entered the trust  

In some situations, reliefs may be available, especially for certain business or agricultural assets. However, these rules are detailed and easy to get wrong without help.

Trustees are legally responsible for reporting income and gains on time and paying any tax due. Keeping good records and working with professionals can reduce the risk of penalties and interest from HMRC.

Using Trusts to Protect Family Assets Sensibly

The main reason many families use trusts is protection, not just tax. A well-thought-out will trust can help guard:

  • The family home, so it is not too exposed to new partners, divorces or claims  
  • Business interests, so they stay within the family or with trusted people  
  • Savings and investments, so vulnerable or young beneficiaries are supported, not overwhelmed  

Careful drafting can strike a balance between flexibility and tax awareness. Trusts that are too rigid can cause problems when life changes. Trusts that are too wide or vague can create uncertainty, higher tax or disputes between beneficiaries.

Points to think about include:

  • Who will act as trustees and whether they understand the job  
  • How much power they should have to decide who benefits and when  
  • Whether you should leave a separate letter of wishes to guide them  

A letter of wishes is not legally binding, but it can explain what matters to you in plain language. Trustees can then make day-to-day decisions that still reflect your values, even many years later.

Summer often gives families a little more breathing space, especially around school holidays or before big autumn changes like university, moves or business changes. It can be a good moment to sit down and check whether your current wills and trusts still match your life.

When to Review Your Will Trusts and Inheritance Plan

Trust tax rules, family situations and property values change over time. A will trust that fitted your life ten years ago may not be right today.

Key times to review include:

  • Marriage, civil partnership or separation  
  • New children or grandchildren  
  • Buying, selling or significantly upgrading a home  
  • Receiving an inheritance or large gift  
  • Changes to tax rules that affect IHT, income tax or CGT  

Outdated structures can cause extra tax or send assets to people you no longer intend to benefit. In some cases, allowances like the residence nil rate band may be lost because of how a will was drafted before those rules existed.

At Sovereign Planning, we offer home visits across the UK to talk through existing wills, trusts and lasting powers of attorney in a calm, unhurried way. Our aim is to help you understand how trust tax works in your situation, clarify your wishes and put clear, legally sound documents in place so your estate plan actually protects the people you care about.

Protect Your Legacy With Informed Trust Tax Planning

If you are unsure how trust tax might affect your estate, we can help you make clear, confident decisions. At Sovereign Planning, we work with you to structure wills and trusts that reflect your wishes while remaining tax-efficient. Speak to our team today to explore your options in detail or to arrange a consultation through our contact page.

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