Immediate Post-Death Interest Trusts and IHT: IPDI Explained
An IPDI trust is a life interest created immediately by a will — treated as if the life tenant owns the trust fund for IHT. The spousal exemption applies fully where the life tenant is the surviving spouse, and no 10-year or exit charges apply. It is the standard structure for protecting the family home while giving the surviving spouse lifetime use.
Key Features of an IPDI
What makes a trust an IPDI
Under s49A IHTA 1984, a trust is an IPDI (and therefore a qualifying interest in possession) if: (1) the interest in possession arises under the will (or intestacy) of a deceased person; (2) it arises immediately on the death — there is no period of discretion or gap before the life interest begins; (3) it was created on or after 22 March 2006 (before that date, all interests in possession were qualifying). The 'immediate' requirement means that a discretionary trust established by the will (where the trustees decide later to grant a life interest) is NOT an IPDI — the life interest must arise automatically from the will itself on the date of death. A trust that provides 'my trustees shall hold for my spouse for life' creates an IPDI immediately on death.
IHT treatment: the life tenant is treated as owning the trust fund
The fundamental IHT consequence of IPDI status (under s49 IHTA 1984, as modified by s49A) is that the life tenant is treated as if they own the trust fund absolutely. This means: (1) the trust fund is included in the life tenant's estate for IHT purposes — both during their lifetime (if they make a lifetime transfer of their interest) and on their death; (2) the spousal exemption applies if the life tenant is the surviving spouse or civil partner of the deceased — so leaving the entire estate to a surviving spouse via an IPDI is fully IHT-exempt; (3) the life tenant can use their own NRB and RNRB against the trust fund on their death; (4) the trust fund is NOT subject to the relevant property regime (no 10-year periodic charges, no exit charges) because it is treated as the life tenant's property, not as relevant property.
IPDI and the spousal exemption — the 'life interest will trust' for couples
The most common use of an IPDI is the 'life interest will trust' where the first spouse to die leaves their estate on trust for the surviving spouse for life, with remainder to the children. The IHT position on the first death: spousal exemption applies in full (or up to the NRB is used by the NRB discretionary trust if a two-trust structure is used). The trust fund forms part of the surviving spouse's estate on the second death — subject to IHT (applying available NRB, transferred NRB, RNRB, transferred RNRB). This structure achieves: (1) full IHT efficiency on the first death (spousal exemption); (2) the surviving spouse has the benefit of the assets for life; (3) the children are protected as remainder beneficiaries (the surviving spouse cannot change the remainder destination).
IPDI and the Residence Nil-Rate Band (RNRB)
The RNRB can apply to an IPDI where: (1) the IPDI trust includes the deceased's residential property (or a share of it); (2) the life tenant is the surviving spouse; (3) on the life tenant's death, the property (or a share) passes to a direct descendant of the deceased — either via a further trust or absolutely. HMRC accepts that the RNRB can be claimed on both the first and second deaths in a life interest will trust structure, provided the property (or a property representing it) is still held in the trust and passes to direct descendants on the second death. The RNRB is available on the first death (on the deceased's estate transferred into the IPDI) and on the second death (on the IPDI assets treated as part of the surviving spouse's estate). This means a couple can claim up to £2m combined RNRB and NRB in appropriate circumstances.
Termination of the IPDI — IHT consequences
When the IPDI terminates (on the life tenant's death, or during their lifetime if the interest is surrendered), the IHT consequences depend on what happens to the trust fund: (1) On the life tenant's death: the trust fund is treated as part of the life tenant's estate — subject to IHT (with any available NRB, RNRB, and other reliefs), and then passes to the remainder beneficiaries. (2) If the life tenant surrenders the interest during their lifetime (e.g. directing the trust fund to the remainder beneficiaries immediately): this is a potentially exempt transfer (PET) from the life tenant — starting the 7-year clock. If the life tenant survives 7 years from the surrender, the surrendered trust fund falls outside the estate. (3) If the trust fund is appointed to a discretionary trust on the life tenant's death: the appointment is a chargeable transfer from the life tenant's estate — subject to IHT at the death rate — and the discretionary trust then enters the relevant property regime.
Frequently Asked Questions
Is an IPDI the same as a life interest trust?
An IPDI is a specific type of life interest trust that satisfies the s49A qualifying conditions. All IPDIs are life interest trusts, but not all life interest trusts are IPDIs. A life interest trust created during the settlor's lifetime (an inter vivos trust) is not an IPDI — it is a non-qualifying interest in possession and is treated as a relevant property trust (subject to 10-year charges and exit charges). A life interest trust created by a will but where the life interest does not arise immediately on death (e.g. the trustees have a period of discretion before granting the life interest) is also not an IPDI. Only a life interest arising immediately under the will on the date of death qualifies as an IPDI. In everyday usage, 'life interest will trust' and 'IPDI' are often used interchangeably — but technically the IPDI label requires the s49A conditions to be satisfied.
Can the surviving spouse access the trust capital in an IPDI?
Under a standard IPDI, the surviving spouse has the right to income — not capital. The trustees control the capital, and it is held for the remainder beneficiaries (typically the children). However, the trust deed can include a power for the trustees to advance capital to the life tenant (surviving spouse) in appropriate circumstances — for example, to fund long-term care costs, or for major capital expenditure. Whether to include such a power, and how broad it should be, is a drafting choice. A power to advance capital to the life tenant does not disqualify the IPDI — it is the income entitlement (not exclusive capital entitlement) that defines the life interest. If the trustees exercise a power of advancement to give the life tenant capital, that advancement is a termination of the IPDI pro tanto — potentially triggering a PET from the life tenant to the remainder beneficiaries.
What is the NRB discretionary trust combined with an IPDI?
A common will drafting structure for married couples combines an NRB discretionary trust with an IPDI: (1) On the first death: the NRB amount (£325,000) passes into a discretionary trust for the benefit of the surviving spouse and/or children — using the first spouse's NRB without spousal exemption. (2) The remaining estate passes to the surviving spouse on IPDI (life interest), qualifying for full spousal exemption. This means on the first death, the NRB is banked into the discretionary trust (sheltering it from IHT in the second estate) and the remainder is exempt. On the second death: the IPDI assets are in the surviving spouse's estate; the NRB discretionary trust assets (now potentially grown) are outside the second estate (having been in the discretionary trust). However, since the Finance Act 2008 introduced the transferable NRB, this structure has become less necessary for most couples — the surviving spouse can simply claim two NRBs on the second death. The NRB/IPDI combination structure remains relevant for larger estates, blended families, or asset protection against care costs or remarriage.
Can an IPDI be created by deed of variation?
Yes — a deed of variation made within 2 years of death can redirect assets into a trust that qualifies as an IPDI. The variation is read back into the will under s142 IHTA 1984, and the IPDI treatment applies from the date of death. This allows beneficiaries who have inherited outright to redirect their inheritance into an IPDI — for example, where the will left everything to the surviving spouse outright but the family would benefit from a life interest structure (e.g. for asset protection, RNRB maximisation, or care fee planning). A deed of variation creating an IPDI is a common post-death planning tool used by solicitors administering estates where the will drafting did not anticipate the family's current circumstances.
What happens to the RNRB if the IPDI life tenant goes into care and the trust property is sold?
The RNRB is available where residential property (or 'inherited residential property') forms part of the estate that passes to direct descendants. If the IPDI includes residential property but the trustees sell the property during the life tenant's lifetime (e.g. to fund care home fees), the RNRB may be lost — because the property has been sold and the sale proceeds are no longer 'residential property' for RNRB purposes. However, if the proceeds are used to purchase a new residential property, the RNRB can apply to the new property. The downsizing addition (s8FA IHTA 1984) may also preserve some RNRB where the property was sold or downsized after 8 July 2015. RNRB planning in the context of IPDI trusts that may need to sell property for care fee funding should be reviewed regularly with a specialist.
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