Life Interest Trusts Explained

What is a life interest trust?

A life interest trust is an arrangement in which one person — the life tenant — has the right to receive the income from the trust assets, or to live in a property held by the trust, for their lifetime, while the underlying capital is preserved and ultimately passes to other people chosen by the person who set the trust up. It is a way of separating the enjoyment of an asset from its eventual ownership. In legal terms a life interest is a form of interest in possession (IIP) trust: the beneficiary has a present right to present enjoyment, rather than having to wait for a trustee to decide whether they receive anything.

The classic example is a will that lets a surviving spouse stay in the family home and draw the income from investments for the rest of their life, with everything passing to the deceased's children once the survivor dies. The survivor is the life tenant; the children are the remaindermen. If you are new to trusts generally, our guide to what a trust is sets out the building blocks first.

How a life interest trust works

Three roles drive every life interest trust. The settlor creates it — usually through their will, in which case it is a will trust that springs into existence on death. The trustees become the legal owners of the assets and are responsible for managing them, paying income to the life tenant and protecting the capital for the remaindermen. The beneficiaries fall into two groups: the life tenant, who enjoys the asset now, and the remaindermen, who inherit later.

What the life tenant actually receives depends on the asset. With an investment portfolio or rental property, the life tenant takes the income — dividends, interest or rent — but cannot demand the capital. With the family home, the life tenant is usually given the right to occupy it, and often a right to move and have the trustees buy a replacement property. The trustees hold the balance between generating a fair income for the life tenant and not eroding the capital that the remaindermen are due to receive — a duty explored further in our note on trustee duties and responsibilities.

Life tenant versus remaindermen

The distinction between the two classes of beneficiary is the heart of the structure. The life tenant has an income interest: a present, fixed right to enjoy the fruits of the assets, but no entitlement to the assets themselves. The remaindermen have a capital interest in remainder: they are entitled to the assets only after the life interest ends, normally on the life tenant's death.

This split is what makes the life interest trust so useful where someone wants to provide for one person during their lifetime while guaranteeing that a different group ultimately inherits. The life tenant cannot disinherit the remaindermen, sell the capital and spend it, or leave it to someone else in their own will, because they never own it. That certainty is the main reason these trusts appear so often in carefully drafted wills — see our guide on protecting your children's inheritance with trusts.

Why they suit second marriages

Life interest trusts are the standard tool for blended families and second marriages. Consider someone who remarries but has children from a first relationship. Leaving everything outright to a new spouse risks the children being unintentionally cut out, because the surviving spouse could later remarry, rewrite their will, or simply leave the estate elsewhere. Leaving everything directly to the children, on the other hand, could leave the surviving spouse without a home or income.

A life interest trust resolves the tension. The will places the deceased's share of the home and investments into trust, giving the surviving spouse the right to live there and draw the income for life. On the survivor's death the assets pass to the deceased's own children as remaindermen. The spouse is cared for; the children's inheritance is ring-fenced. A related benefit is asset protection: because the survivor only owns a life interest, that protected share is less exposed if the survivor later needs residential care — a theme we cover in what happens to my house if I go into a care home. It is not a guaranteed shield, and deprivation-of-assets rules can apply, so take advice.

Inheritance tax treatment

The inheritance tax position of a life interest trust depends heavily on when and how it was created. The most favourable category is an immediate post-death interest (IPDI) — a life interest created by a will that takes effect on death. For IHT, an IPDI is treated as though the life tenant owns the underlying capital outright. So if a will gives a surviving spouse an IPDI, the spouse exemption applies on the first death, meaning no IHT is payable then even though the assets sit in trust.

The trade-off comes later: because the life tenant is treated as owning the assets, their value is added to the life tenant's estate on their death and taxed accordingly. The trust assets use up — and benefit from — the life tenant's available allowances. Each person has a nil-rate band of £325,000, frozen until April 2030, and a couple's unused nil-rate band and residence nil-rate band can transfer to the survivor, so up to £1 million can pass free of IHT in the right circumstances. The 40% rate applies to value above the available allowances. For the wider picture, see our complete guide to inheritance tax.

Life interest trusts created during lifetime, and most created after March 2006 other than IPDIs and certain trusts for disabled or bereaved minors, are treated very differently — generally as relevant property trusts. These can carry a potential 20% entry charge on amounts above the nil-rate band, periodic charges of up to 6% every ten years, and exit charges, much like discretionary trusts. Because the rules turn on fine distinctions of timing and type, this is an area where professional advice is essential.

Income tax and capital gains tax

Since the life tenant is entitled to the income as it arises, that income is generally taxed as the life tenant's own income at their personal rates, with credit given for tax the trustees have already paid. This is usually more efficient than the higher trust rates that apply to discretionary trusts. Capital gains tax can arise when trustees dispose of assets, and trustees have their own annual exempt amount (broadly half that of an individual). The detail of how these trusts are taxed is set out in our guide to how trusts are taxed in the UK. Trustees must usually register the trust on HMRC's Trust Registration Service.

Advantages and drawbacks

The advantages are clear: the life tenant is provided for, the capital is guaranteed for the chosen remaindermen, the structure is well understood, and — where an IPDI is used — the spouse exemption defers IHT on the first death while income is taxed at the beneficiary's own rates. These trusts also bring a measure of protection against a future change of heart, remarriage, or care costs eroding the children's share.

The drawbacks deserve equal weight. The structure is rigid: the life tenant cannot access capital unless the trustees are given (and exercise) a power to advance it, which can leave them short if circumstances change. Trustees carry real responsibilities and must balance competing interests fairly, which occasionally causes friction between a life tenant who wants more income and remaindermen who want the capital preserved. The IHT, income tax and CGT interactions are intricate, and the wrong type of trust can trigger relevant property charges. Ongoing administration and reporting add cost. As with most estate planning, a life interest trust should be chosen because it fits the family's circumstances — not as a default.

Setting one up

Most life interest trusts are created through a professionally drafted will, so they come into being only on death and qualify as immediate post-death interests. The drafting needs care: the powers given to trustees, the life tenant's rights of occupation, the ability to substitute a property, and the identity of the remaindermen all need to be spelled out precisely. Getting the trust type right is what determines the tax treatment, so this is firmly a job for a qualified estate planner or solicitor rather than an off-the-shelf form. If you are weighing whether a trust is even the right route, our comparison of a trust versus a will is a useful next read.