Inheritance tax on a life interest trust depends almost entirely on when the trust was created. A trust set up by a will is taxed on the life tenant’s death, when its value is added to their estate and charged at 40% above the £325,000 nil-rate band. A lifetime trust made before 22 March 2006 follows the same route. A lifetime trust made on or after that date sits in the “relevant property” regime, which brings an immediate 20% entry charge on value above the nil-rate band, a ten-year periodic charge of up to 6%, and exit charges when capital leaves. The nil-rate band is frozen at £325,000 until at least April 2030.
Why the Creation Date Decides the Tax
The Finance Act 2006 rewrote the rules for life interest trusts. Before 22 March 2006 they sat outside the relevant property regime; after that date, most lifetime versions were pulled in. Three categories now exist, each taxed differently.
Trusts Created by a Will
A life interest created through a will or on intestacy is an “immediate post-death interest” (IPDI) under section 49A of the Inheritance Tax Act 1984. The interest must arise on the death of the person who made the will.1Legislation.gov.uk. Inheritance Tax Act 1984 Section 49A
An IPDI keeps the older, simpler treatment. Under section 49(1), the trust assets are treated as belonging to the life tenant for inheritance tax purposes.2GOV.UK. IHTM16063 – Interests in Possession: The Effects of S49 and S49(1A) No ten-year charges. No exit charges. The full reckoning happens on the life tenant’s death, when the trust value is aggregated with their personal estate and taxed at 40% on anything above the nil-rate band.
Lifetime Trusts Created Before 22 March 2006
A gift into a life interest trust before 22 March 2006 was a potentially exempt transfer (PET). No tax at the time of the gift, whatever the value. If the settlor survived seven years, it dropped out of their estate. If they died sooner, the gift was brought back and taxed at the death rate, with taper relief for gifts made between three and seven years before death.3GOV.UK. How Inheritance Tax Works: Thresholds, Rules and Allowances – The 7 Year Rule
These pre-2006 trusts still enjoy the deemed-ownership rule in section 49(1), so the trust value forms part of the life tenant’s estate on their death, and no periodic or exit charges apply. The protection lasts only while the original life tenant’s interest continues. If the trust is restructured and a new beneficiary takes over the interest in possession, the replacement interest may fall into the post-2006 rules.
Lifetime Trusts Created on or After 22 March 2006
This is where the 2006 changes bite. A life interest trust created during the settlor’s lifetime on or after 22 March 2006 is taxed as relevant property, the same regime that governs discretionary trusts.4GOV.UK. Trusts and Inheritance Tax The gift into the trust is a chargeable lifetime transfer, not a PET. If it exceeds the settlor’s available nil-rate band of £325,000, inheritance tax is charged immediately at 20%.5GOV.UK. Inheritance Tax Manual – Section 4: Transfer of Value in Life and on Death If the settlor pays the tax rather than the trustees, the effective rate rises to 25%, because the tax payment itself is treated as a further transfer.
Two ongoing charges then apply:
- A periodic charge on every tenth anniversary of the trust’s creation, at a maximum rate of 6% on the value of the trust property. The charge is often lower, and trusts valued below the nil-rate band may pay nothing.
- An exit charge when capital is distributed between anniversaries, calculated proportionally by reference to the most recent periodic charge.
The life tenant’s interest in a post-2006 lifetime trust does not carry deemed ownership. The trust assets are not added to the life tenant’s personal estate on death, and the death of the life tenant is not the main taxing event. The periodic and exit charges do the work.
Transitional Serial Interests
A narrow bridge exists for interests created between 22 March 2006 and 5 October 2008. If a pre-2006 trust already held an interest in possession, and that interest ended during this window, the replacement can qualify as a “transitional serial interest” and keep the old deemed-ownership treatment.6GOV.UK. IHTM16061 – Interests in Possession: Finance Act 2006 and the New Rules Outside those conditions, any new interest in possession created after March 2006 during the settlor’s lifetime falls into the relevant property regime.
Tax on the Life Tenant’s Death
For IPDIs, pre-2006 interests, and transitional serial interests, the life tenant’s death is the main taxing event. The trust assets are valued at market value on that date and treated as part of the life tenant’s estate, even though they never had the power to sell or spend the capital. Section 49(1) creates that legal fiction so that wealth held in trust for someone’s benefit does not escape inheritance tax simply because they lacked ownership rights.2GOV.UK. IHTM16063 – Interests in Possession: The Effects of S49 and S49(1A)
The trust value is combined with the life tenant’s personal assets — bank accounts, investments, property held outright — and inheritance tax of 40% applies to the total above the £325,000 nil-rate band.7GOV.UK. How Inheritance Tax Works: Thresholds, Rules and Allowances The tax attributable to the trust is normally paid from the trust’s own capital. The executors handle the tax on the personal estate separately.
The Spouse Exemption on the First Death
Transfers between spouses and civil partners are exempt from inheritance tax under section 18 of the Inheritance Tax Act 1984, and the exemption reaches life interest trusts.8Legislation.gov.uk. Inheritance Tax Act 1984 Section 18 Where a will creates a life interest trust for a surviving spouse, the assets pass into the trust free of inheritance tax on the first death. The charge is deferred until the surviving spouse dies, at which point the trust value enters their estate.
Many life interest trusts for a surviving spouse produce no inheritance tax bill at all on the first death, even for large estates. The full charge arrives on the second death, when the trust plus the survivor’s personal estate are assessed together. The survivor’s nil-rate band and residence nil-rate band matter greatly at that point, and any unused nil-rate band from the first death should be preserved through a portability claim where appropriate.
Nil-Rate Band, RNRB, and the £2 Million Taper
The nil-rate band has been frozen at £325,000 since April 2009 and will remain there until at least April 2030.9GOV.UK. Inheritance Tax Thresholds and Interest Rates The residence nil-rate band adds up to £175,000 where a home passes to direct descendants such as children or grandchildren.10GOV.UK. Inheritance Tax Nil-Rate Band and Residence Nil-Rate Band Thresholds From 6 April 2026 Together the allowances can shelter up to £500,000 per person, or £1 million for a married couple where the first spouse’s unused allowances transfer to the survivor.
The RNRB can apply where a property held in a life interest trust passes to direct descendants on the life tenant’s death. There is a clawback for larger estates: the RNRB tapers by £1 for every £2 that the combined estate exceeds £2 million.11GOV.UK. Check if an Estate Qualifies for the Inheritance Tax Residence Nil Rate Band Because trust assets are aggregated with the life tenant’s personal estate, a modest personal estate combined with a valuable trust can easily breach the £2 million threshold and wipe out the RNRB entirely.
If the Life Tenant Surrenders Their Interest Early
Giving up a life interest before death is not tax-free. Under section 51 of the Inheritance Tax Act 1984, the surrender is treated as the interest coming to an end, which triggers a deemed transfer of value.12GOV.UK. IHTM04085 – Interests in Possession: Disposal of an Interest It applies to qualifying interests, including IPDIs and pre-2006 interests. The deemed transfer is measured by the value of the trust property in which the interest subsisted, and the lifetime exemptions that ordinarily reduce voluntary gifts do not apply. Take professional advice before any early surrender, because the tax consequences can be severe.
Capital Gains Tax Uplift on Death
When a life tenant with a qualifying interest dies, the trust assets receive a capital gains tax-free uplift to market value. Trustees are treated as having disposed of and immediately reacquired the assets at market value, but no CGT arises on the deemed disposal.13GOV.UK. CG36300 – Interests in Possession: Death and CGT The remaindermen inherit with a clean base cost, and a sale shortly after the life tenant’s death produces little or no gain.
The uplift is limited to qualifying interests: IPDIs, pre-2006 interests, and transitional serial interests. Post-2006 lifetime trusts inside the relevant property regime do not get the automatic uplift. If a beneficiary of such a trust becomes absolutely entitled, there is a deemed disposal at market value that can trigger a capital gains charge.
Filing and Payment
Reporting the tax involves both the trustees and the executors. Trustees use form IHT100b to notify HMRC that a qualifying interest in possession has ended because someone died.14HM Revenue and Customs. Tell HMRC That Inheritance Tax Is Due on a Gift or Trust (IHT100) Executors report the personal estate on form IHT400 as part of probate.15GOV.UK. Inheritance Tax Account (IHT400)
Inheritance tax must be paid by the end of the sixth month after the month of death. If the life tenant died in January, the deadline is 31 July.16GOV.UK. Pay Your Inheritance Tax Bill Missing it triggers interest at 7.75% on the outstanding balance, which mounts quickly on a large trust.9GOV.UK. Inheritance Tax Thresholds and Interest Rates
Paying by Installments
Certain assets qualify for payment of inheritance tax in ten equal annual installments. Houses are the most common qualifying asset in a life interest trust. The first installment falls on the same six-month deadline, with the rest on each anniversary.17GOV.UK. Pay Your Inheritance Tax Bill: In Yearly Instalments Interest continues to accrue on the unpaid balance, so the total cost is higher than paying in a lump sum. If the house is sold before the installments are complete, the remaining tax becomes due immediately. Controlling shareholdings, some unlisted shares, and business interests run for profit can also qualify. The election is made on form IHT400.
The Seven-Year Rule Where the Settlor Dies
The seven-year rule matters for lifetime trusts if the settlor dies within seven years of creating the trust. For a pre-2006 PET, the full value comes back into the settlor’s estate and is taxed at the death rate. For a post-2006 chargeable lifetime transfer, the 20% lifetime charge was already paid; any additional tax up to the 40% death rate becomes payable, with credit for the tax already paid.
Taper relief reduces the effective tax rate on gifts made between three and seven years before death:3GOV.UK. How Inheritance Tax Works: Thresholds, Rules and Allowances – The 7 Year Rule
- 3 to 4 years before death: 32%
- 4 to 5 years: 24%
- 5 to 6 years: 16%
- 6 to 7 years: 8%
- 7 years or more: 0%
Taper relief only bites where the cumulative value of gifts in the seven years before death exceeds the £325,000 nil-rate band. For smaller gifts, the nil-rate band absorbs the value and there is no tax for taper relief to reduce.