Life Insurance for UK Inheritance Tax: Cost vs Cover
A 60-year-old couple with £4m of net estate above the nil-rate bands faces a prospective IHT liability of £1.6m on second death. Whole-of-life cover for that £1.6m, written in trust on a joint life second death guaranteed-premium basis, typically costs £25,000 to £40,000 a year for a healthy couple. Across a 25-year average remaining life expectancy, that is £625,000 to £1m of premiums to cover £1.6m of liability. The case for the structure depends on whether the premiums can be funded from income and on how the post-April 2027 IHT-on-pensions change has rewritten the calculation.
For most of the modern UK IHT regime, life insurance written in trust has been a useful but second-tier planning tool. The structural priority for IHT planning has been to use the nil-rate bands fully, plan gifts to fall outside the seven-year window, hold qualifying business assets to access Business Property Relief, and structure pensions to sit outside the estate. Life insurance has filled the gap that traditional planning leaves behind, the part of the IHT liability that cannot be eliminated through structural planning alone.
The April 2027 inclusion of unused defined contribution pensions in the IHT net materially changes that calculation. For HNW clients with significant pension wealth, the IHT exposure that was previously zero on the pension portion of the estate is now 40%. Where beneficiaries also draw the inherited pension as income, the interaction between IHT and income tax on drawdown creates a compounding charge, HMRC has proposed a credit mechanism to offset income tax against IHT paid on the same funds, but the effective economic cost to beneficiaries is materially higher than on traditional estate assets. The planning levers available to mitigate that exposure are also narrower than they were on traditional assets.
For many clients, the case for whole-of-life cover written in trust has shifted from a useful supplement to a primary planning tool in a way that was not true twelve months ago.
This article sets out how the structure actually works, what it costs, when it makes sense, and the technical decisions that materially change the outcome.
The IHT exposure for HNW clients: a quick refresher
The nil-rate band is £325,000 per individual and is transferable between spouses, producing a combined £650,000. The residence nil-rate band adds up to £175,000 per individual (£350,000 per couple) where a qualifying residential interest passes to direct descendants, but it tapers away at £1 of RNRB for every £2 of estate above £2m. For a single individual, the full RNRB is eliminated at £2.35m. For a couple claiming the full transferred allowance, the taper-out point is £2.7m.
For most HNW clients, the practical position is that the RNRB is fully tapered away and the available nil-rate bands are limited to the £650,000 transferable nil-rate band on the second death. The IHT charge is 40% on everything above that.
A couple with £4m of net estate above the nil-rate bands therefore faces a prospective £1.6m IHT liability on second death. A couple with £8m of net estate faces a £3.2m liability. The numbers scale linearly above the threshold and do not reduce until the full estate value is brought down through gifting, BPR, or other planning structures.
For clients with significant pension wealth, the post-April 2027 figures are materially higher than the equivalent calculation pre-2027, in many cases by £500,000 to £2m of additional IHT exposure on the pension portion of the estate.
How life insurance in trust works
The structure is mechanically straightforward. The policyholder buys a whole-of-life insurance policy with a death benefit calibrated to the prospective IHT liability. The policy is written into a trust at outset, with named beneficiaries (typically children) and trustees (typically the policyholder and one or two others initially, with successor trustees named).
When the policyholder dies or for joint-life-second-death policies, when the second spouse dies, the insurance pays out the death benefit. Because the policy is held in trust, the proceeds fall outside the deceased’s estate for IHT purposes. The trustees then distribute the proceeds to the beneficiaries, typically using the cash to pay the IHT bill on the rest of the estate without the family needing to sell illiquid assets at short notice.
Three structural points worth understanding
The policy is held in trust from day one. Setting the policy up outside trust and then transferring it later is technically possible, but creates complications around the seven-year clock and CGT on the transfer. Setting up in trust at outset is the structurally clean approach.
The policy itself does not appear in the deceased’s estate at any point. It is the trust that owns the policy; the trust pays out to the beneficiaries; the deceased’s estate is unaffected. This is what makes the structure work.
The premiums may themselves be gifts for IHT purposes. Premiums paid by the policyholder for a policy held in trust may be considered gifts to the trust. Where they exceed available exemptions, they may sit on the seven-year clock. The most useful structural exemption and one of the most underused in UK IHT planning is the gifts-out-of-normal-expenditure exemption, which we cover below.
Whole-of-life vs term: why most HNW IHT planning uses whole-of-life
Term assurance covers a fixed period, typically 10, 20, or 30 years. If the policyholder dies within the term, the policy pays out. If they survive the term, no payment is made and the premiums paid are not recoverable.
Whole-of-life cover continues for the policyholder’s lifetime. Provided premiums are paid, the policy will pay out whenever death occurs.
For IHT planning, term assurance only fits very specific use cases, typically the seven-year PET window after a large lifetime gift, where the term covers the period during which the gift is still in scope for IHT. Outside that specific application, term assurance does not fit IHT planning because the IHT liability arises whenever death occurs, not within a defined period.
Whole-of-life cover is the dominant structure for HNW IHT planning specifically because the death benefit pays out whenever death occurs, exactly when the IHT liability crystallises.
Joint-life-second-death: the standard structure for couples
For married couples, the IHT liability typically arises on second death because the spousal exemption defers the IHT charge until the surviving spouse dies. This means the planning need is for cover that pays out on second death, not on first death.
Joint-life-second-death whole-of-life policies are designed exactly for this purpose. They cover both lives, pay out only on the second death, and price the cover accordingly. Premiums are materially lower than two separate single-life policies because the insurer is only paying out once and is effectively pricing on the longer of the two lives.
For a healthy 60-year-old couple, joint-life-second-death whole-of-life cover for £1.6m on a guaranteed-premium basis typically costs £25,000 to £40,000 a year. The exact figure depends on health, smoker status, and the specific underwriting profile of each spouse, but the range is broadly indicative.
Guaranteed vs reviewable premiums: the most important structural decision
Whole-of-life policies can be priced on a guaranteed or reviewable basis.
Guaranteed premiums are fixed for life. The premium quoted at outset is the premium paid every year for the life of the policy, regardless of changes in the policyholder’s health, mortality experience generally, or the insurer’s pricing assumptions.
Reviewable premiums are quoted at outset but reviewed by the insurer at defined intervals, typically every five or ten years. At each review, the insurer recalculates the premium based on updated mortality and pricing assumptions.
For long-dated whole-of-life policies, reviewable premiums can rise sharply over the lifetime of the cover. Premiums starting at £20,000 a year on a 60-year-old couple’s policy can increase to £60,000 to £100,000 a year by the time the second spouse dies in their late 80s, because the relative cost of insuring a near-certain death event approaches the cover amount.
Reviewable premiums look cheaper at outset and almost always cost more across the lifetime of the policy. For long-dated IHT cover where the planning horizon is 20 to 40 years, guaranteed premiums are almost always the right structural choice, even though they cost more in the early years.
The premium decision at outset compounds across decades. Most HNW clients we work with have not had this point properly explained when their existing policies were set up. Reviewing existing cover specifically against this question is one of the higher-value reviews available.
Premiums as gifts, and the gifts out of normal expenditure exemption
Premiums paid for a policy held in trust may be considered gifts to the trust for IHT purposes. The first £3,000 a year falls within the standard annual gift exemption. Above that, premiums sit on the seven-year clock unless they fall within another exemption.
The most useful exemption and one of the most underused in UK IHT planning is the gifts out of normal expenditure exemption (IHTA 1984 s.21). This applies to gifts that meet three tests: they must form part of the donor’s normal expenditure pattern (regular and habitual), they must be made out of income rather than capital, and they must not reduce the donor’s standard of living.
For a HNW client with substantial annual income such as a senior executive, a successful business owner taking dividends, a retiree with significant pension and investment income, the exemption can absorb substantial annual gifting without any IHT exposure on the gifts themselves. Premiums of £25,000 to £40,000 a year paid out of regular income for a policy held in trust can sit comfortably within this exemption for clients whose income substantially exceeds their needs.
This is the structural point that makes the maths work. Premiums of £40,000 a year are substantial in absolute terms but relatively modest against the IHT liability they cover. Where the gifts out of normal expenditure exemption applies, the premiums themselves carry no IHT consequence.
When the structure makes sense, and when it doesn’t
The structure makes the most sense for clients with high IHT exposure, sufficient income to fund premiums from regular income, and a planning horizon that justifies the long-dated cover. For most HNW couples in their 50s and 60s with £4m or more of estate above the nil-rate bands, the structure is genuinely useful.
The structure makes less sense in three situations.
— For clients whose IHT exposure can be eliminated through structural planning alone: heavy use of BPR-qualifying assets, lifetime gifting under the seven-year rules, FIC and trust structures that effectively remove assets from the estate. The need for life cover declines as the underlying liability is reduced.
— For clients who cannot afford premiums from regular income. If the premiums need to come from capital, the gifts out of normal expenditure exemption does not apply and the premiums sit on the seven-year clock. The structure still works but the maths is less favourable.
— For clients whose underwriting is poor. Whole-of-life cover is priced largely on mortality risk. Clients with significant health conditions face premiums that may be uneconomic relative to the cover. In these situations, alternative IHT planning structures usually provide better value.