Introduction
Inheritance tax (IHT) is one of the most predictable large financial liabilities many HNW individuals face. Unlike income tax, investment risk, or health uncertainty, IHT is almost certain to arise (for those within the scope of UK IHT with estates above the nil-rate band) and the approximate amount can be calculated years in advance.
A whole-of-life policy written in a discretionary trust is one of the most direct and cost-effective ways to fund that liability. This guide explains the mechanics — how the policy interacts with the trust, what the premium cost really means, and what the critical decisions are at the outset.
The IHT Problem It Solves
The liability
A long-term UK resident's estate — including all worldwide assets — is subject to IHT at 40% on the value above the available nil-rate band (£325,000 as of 2026/27, with an additional residence nil-rate band of £175,000 in some circumstances).
For couples, assets typically pass between spouses on first death free of IHT (the spousal exemption), and the unused nil-rate band transfers to the surviving spouse. IHT is due on the second death — when the full combined estate (less available nil-rate bands) passes to the next generation.
For a couple with combined assets of £3 million (property, investments, pension, business interests), the IHT liability might be approximately:
(£3,000,000 − £1,000,000 nil-rate bands) × 40% = £800,000
That £800,000 must be paid to HMRC within 6 months of the second death. If the estate is largely illiquid — property, a private business, long-term investments — finding £800,000 in cash within 6 months can be extremely difficult. Assets may need to be sold at a disadvantageous time.
The policy solution
A whole-of-life policy with a sum assured of £800,000, written in a discretionary trust, pays £800,000 in cash to the trustees on the second death. The trustees use those funds to pay the IHT bill. The estate's illiquid assets are preserved. The beneficiaries receive the estate intact — minus the IHT paid by the trust.
The policy does not avoid or reduce the IHT. It funds it. The advantage is certainty: regardless of what happens to investment markets, property values, or business fortunes between now and the second death, the IHT liability will be met from the policy proceeds without disturbing the estate assets.
How the Trust Wrapper Works
Why the trust matters
Without a trust, the death benefit of a whole-of-life policy forms part of the deceased's estate. It is subject to probate (which can take months or years) and is itself subject to IHT — the very problem it was designed to solve.
Written into a discretionary trust, the policy and its proceeds are owned by the trustees — not the policyholder. On death, the trustees receive the death benefit directly from the insurer, outside probate, and free of IHT (because the proceeds were never in the estate).
The trustees then exercise their discretion to pay the IHT bill from the trust funds — or to distribute the funds directly to the beneficiaries, who then pay the IHT.
Trust structure
The most common structure for IHT planning is:
Settlors: the policyholders (the couple, or individual) Trustees: typically a combination of the settlors themselves and independent trustees (a solicitor or a trust company) Beneficiaries: children, grandchildren, and other intended heirs — plus provisions to cover the settlors in case of need (though inclusion of settlors as beneficiaries requires careful drafting to avoid the Gift with Reservation of Benefit rules)
A discretionary trust gives the trustees flexibility to decide how and when to distribute the proceeds — allowing them to respond to the circumstances at the time of the second death rather than being bound by rigid provisions.
Relevant Property Charges
Writing a policy into a discretionary trust means the trust is subject to the Relevant Property Regime — periodic charges (every 10 years) and exit charges when funds are distributed. For a pure protection policy with a cash value of zero or near-zero (a term or whole-of-life policy funded only for the COI with no significant accumulation), these charges are typically negligible.
For policies with significant cash value accumulation (universal life or with-profits whole-of-life), the periodic charge calculation is more material and should be factored into the cost-benefit analysis.
Reviewable vs Guaranteed Premiums
This is one of the most important decisions at inception — and one that is frequently misunderstood.
Guaranteed premiums
The premium is fixed at the outset and will never increase, regardless of how the policy performs or how the insurer's mortality assumptions change. The premium quoted at age 55 will be the same at age 80.
The advantages: total certainty of cost; no risk of unaffordable increases in later years when the insured is retired and income may be reduced; simpler financial planning.
The disadvantages: the initial premium is higher than the reviewable equivalent, because the insurer must price in the certainty of never increasing it. For a couple with potentially 30+ years of premiums ahead, the higher starting cost may be significant.
Reviewable premiums
The initial premium is set at a lower level. At the review date (every 5 or 10 years), the insurer assesses the performance of the policy — the actual cost of mortality in the portfolio, the investment returns on the fund, and the projected future cost — and resets the premium for the next period.
If the policy is performing well — low claims experience, good investment returns — the premium at review may stay broadly the same or even reduce slightly. If conditions are adverse — high claims, low investment returns, an ageing insured — the premium at review can increase significantly.
The risk is disproportionate at older ages. A 75-year-old couple reviewing a policy originally written at 55 may face a premium increase of 50–200%, precisely at the time when their income is likely to have reduced and they are least able to absorb the increase. The policy may become unaffordable, leading to surrender — precisely when the IHT planning benefit is needed most.
Recommendation: for IHT planning purposes, guaranteed premiums are almost always preferable. The certainty of cost is worth the higher initial premium.
Joint Life Second Death Policies
Why JLSD is the standard structure for couples
The joint life second death (JLSD) structure insures both spouses under a single policy and pays the death benefit on the second death. This is the most efficient structure for couples because:
- No IHT on first death: assets pass to the surviving spouse free of IHT under the spousal exemption, so no insurance payout is needed on first death
- Full IHT liability on second death: the combined estate passes to the next generation on second death, triggering the full IHT calculation
- Single premium, single claim: a JLSD policy is significantly cheaper than two separate single-life policies providing equivalent cover, because the insurer is paying out once (on the second death) rather than potentially twice
On the first death, the policy simply continues — the premium may be reduced by the insurer (since one life has been removed from the risk), or may remain unchanged depending on the policy terms. The surviving spouse continues to manage the trust and pay premiums until the second death.
Sum assured review after first death
After the first death, the estate position changes — the surviving spouse may have inherited additional assets, the nil-rate bands reset, and the anticipated IHT liability on second death should be recalculated. The policy sum assured should be reviewed and adjusted (increased if available under the policy terms) to reflect the revised estate position.
Cost vs Benefit Analysis
The real cost of the insurance
The premiums paid into a whole-of-life IHT policy are a genuine economic cost — unlike a savings investment, the premiums do not accumulate as personal wealth. The correct way to think about the cost is:
Premium cost = the annual premium × number of years paid before the second death
For a couple paying £5,000 per annum for 25 years before the second death: total premium paid = £125,000.
The policy pays £500,000 on the second death.
Net benefit to the estate: £500,000 − £125,000 = £375,000.
Comparison with other IHT strategies
Whole-of-life IHT insurance is not the only IHT mitigation tool. It sits alongside:
Gifting: gifts from surplus income made regularly can be exempt from IHT (normal expenditure out of income exemption). Large capital gifts enter the 7-year gifting clock.
Business Property Relief (BPR): investments qualifying for BPR (certain unquoted business assets) can attract relief after 2 years of ownership. Note that from 6 April 2026 the 100% rate of BPR (and Agricultural Property Relief) is capped at £2.5 million of combined qualifying assets per estate (per individual), with 50% relief above that threshold (a 20% effective IHT rate), and AIM/unlisted shares now qualify for 50% relief only (they do not use the £2.5 million allowance). The £1 million cap originally announced in the October 2024 Budget was raised to £2.5 million in December 2025, and the allowance is transferable between spouses and civil partners. Higher risk than insurance.
Trusts with gifted assets: gifting assets into trust starts the 7-year clock. Combined with life cover on the donor's life (to fund the IHT if they die within 7 years), this is a common strategy.
Pension: pension death benefits have historically passed outside the estate free of IHT, but from 6 April 2027 most unused pension funds and death benefits fall within the estate for IHT purposes (with personal representatives liable for the charge). Pension rules change frequently — always verify current treatment.
Whole-of-life IHT insurance is unique in that it provides certainty: the defined sum is available on the defined event (second death), regardless of market conditions, policy changes, or life events. It does not depend on survival periods, asset performance, or legislative stability.
How Global Investments Can Help
We arrange whole-of-life IHT planning policies through the major Isle of Man-regulated providers for clients within the scope of UK inheritance tax, living anywhere in the world. We work with your solicitor or estate planning adviser to ensure the trust structure is correctly drafted and the policy and trust interact as intended.
Contact us to discuss your estate planning requirements.
This guide is for general information only and does not constitute financial or tax advice. Inheritance tax rules are complex and change frequently. Always take independent specialist advice from a qualified tax adviser and estate planning solicitor before structuring an IHT mitigation strategy.
Frequently Asked Questions
How does whole of life insurance reduce inheritance tax?
A whole-of-life policy written in a discretionary trust pays its death benefit directly to the trustees — outside the deceased's estate. Because the sum assured is never part of the estate, it is not subject to inheritance tax. The estate pays the IHT liability from its own assets; the trust pays the beneficiaries from the policy proceeds. The net effect is that the beneficiaries receive the full intended inheritance without having to fund the IHT bill from the estate itself. The policy does not reduce the IHT liability — it funds it.
What is a joint life second death whole-of-life policy?
A joint life second death (JLSD) policy insures two lives — typically a married couple or civil partners — and pays the death benefit on the death of the second (surviving) policyholder. This matches the typical IHT timing: on the first death, assets pass to the surviving spouse tax-free (the spousal exemption); IHT falls due on the second death when assets pass to the next generation. The JLSD policy pays exactly when the IHT liability arises, making it the most efficient structure for couples.
What is the difference between reviewable and guaranteed premiums?
A guaranteed premium whole-of-life policy fixes the premium for the life of the policy — it will never increase. A reviewable premium policy has premiums that are reviewed at defined intervals (typically every 5 or 10 years), and the insurer can increase the premium at review if the policy is not performing as originally illustrated. Reviewable premiums start lower but can increase significantly — particularly at older ages when the mortality cost of maintaining the cover rises steeply. A review at age 75 or 80 can produce a very large premium increase that may be unaffordable.
How much does it cost to insure an IHT liability with whole of life?
The cost depends primarily on the sum assured, the age and health of the insured(s), and whether the premium is guaranteed or reviewable. As a very rough indication, a healthy non-smoking couple aged 60 might pay approximately £4,000–£8,000 per annum for a joint life second death policy with a £500,000 guaranteed death benefit. This equates to a cost of approximately 0.8–1.6% of the sum assured per annum. Precise premium quotes require a full underwriting assessment and depend heavily on health, lifestyle, and provider.
Can an expat take out a whole-of-life policy in trust for UK IHT purposes?
Yes. Following the move to a residence-based IHT regime on 6 April 2025, individuals who are long-term UK residents (broadly, UK-resident for at least 10 of the previous 20 tax years) remain subject to UK inheritance tax on their worldwide estate regardless of where they currently live. An Isle of Man-regulated whole-of-life policy written in a UK or offshore discretionary trust can be used to fund a UK IHT liability — the policy travels with the client, pays on death wherever they are living, and the trust distributes the proceeds to meet the IHT bill. The trust must be properly drafted to ensure the proceeds fall outside the estate for IHT purposes.
This guide is for general information only and does not constitute financial or insurance advice. Policy terms, premium rates, and insurer eligibility criteria change — always verify current terms with a qualified independent adviser before taking out any policy.