Insurance Curator 
Setting up a life insurance trust is one of the smartest ways to protect your family from a hefty inheritance tax (IHT) bill. Without a trust, your life insurance payout forms part of your estate and can be taxed at 40% on anything above the £325,000 nil‑rate band. That means a £500,000 policy could lose £70,000 to HMRC before your beneficiaries see a penny.
But here’s the catch: a badly‑managed or incorrectly drafted trust can backfire spectacularly. The very protection you intended can vanish, and the payout can be pulled back into your estate for IHT purposes. In this guide, we’ll walk through the most common life insurance trust mistakes that can accidentally trigger that 40% charge – and show you exactly how to avoid them.
Recommended reading: Money. Wealth. Life Insurance.: How the Wealthy Use Life Insurance as a Tax-Free Personal Bank to Supercharge Their Savings – a best‑selling guide to using life insurance strategically, including trust structures. Highly rated at 4.6 stars.
Mistake #1: Not Writing the Policy in Trust at All
The most basic mistake is also the most common. Many people buy life insurance and simply name their spouse or children as beneficiaries on the policy. In the UK, that does not remove the payout from your estate for IHT purposes. The proceeds still count as part of your estate unless the policy is written under a trust.
The fix: Immediately after taking out a new policy, ask your insurer to write it “in trust”. If you already have a policy, you can assign it into an existing trust – but this is a technical process and needs proper legal advice. For a detailed step‑by‑step guide, see our article on Writing Your Life Insurance Policy in Trust: Step-by-step for UK Policyholders.
Mistake #2: Using the Wrong Type of Trust
Life insurance can be held in either a bare trust or a discretionary trust. Each has very different tax and control implications.
| Trust Type | How it works | IHT risk |
|---|---|---|
| Bare trust | Beneficiaries have an absolute right to the policy and proceeds as soon as they turn 18. | Lower risk – but lose flexibility if circumstances change. |
| Discretionary trust | Trustees decide who gets what and when. | Can trigger a 6% charge every 10 years if the trust value exceeds the nil‑rate band. Also, the policy is treated as a gift, potentially subject to the 7‑year rule. |
Choosing a bare trust when you want flexibility, or a discretionary trust when you have a simple family structure, can lead to unintended tax bills. For a full comparison, read Discretionary vs Bare Trusts for Life Insurance: Which Works Best for Your Family?.
Mistake #3: Naming Your Estate as Beneficiary
Some people write their life insurance “to my estate” so that their Will dictates who gets the money. This is a serious error. When the policy is written to the estate, HMRC treats it exactly like cash in a bank account. It’s fully subject to IHT, and the 40% charge applies before any distribution.
Correct approach: Always name specific individuals or the trustees of your trust as the beneficiary. Avoid any reference to “my estate”.
Mistake #4: Failing to Ensure the Trust Is Properly Executed and Witnessed
A trust deed that isn’t signed correctly is worthless in the eyes of HMRC. If the deed lacks a witness, or if the witness is the beneficiary, the trust may be deemed invalid. The policy then falls back into your estate, and the full 40% IHT applies.
Don’t cut corners. Have your trust deed professionally drafted by a solicitor who specialises in estate planning. If you live in London, Edinburgh, Cardiff or Belfast, regional expertise can make a big difference. Our Regional Guide to Setting up a Life Insurance Trust: Finding Solicitors in London, Edinburgh, Cardiff and Belfast will help you find the right advisor.
Mistake #5: Letting the Trust Become ‘Settlor-Interested’
Under current UK rules, if you (the settlor) or your spouse can benefit from the trust in any way, the trust is “settlor‑interested”. That means the entire value of the policy is treated as part of your estate for IHT purposes – even though it’s in a trust.
For example, if you set up a flexible trust that allows the trustees to pay the premiums out of trust income, and you retain the right to change beneficiaries, you may have inadvertently created a settlor‑interested arrangement.
Avoid this by: having no power to direct trustees, no right to receive income, and no spouse listed as a potential beneficiary. Keep the trust entirely for your children or other family members.
Mistake #6: Not Reviewing After a Major Life Change
Marriage, divorce, the birth of a child, or a change in tax law can all affect your trust’s effectiveness. A trust that worked perfectly five years ago might now be the source of a large IHT liability.
- Divorce: Your ex‑partner may still be named as a beneficiary or trustee.
- New marriage: You may need to update the trust to protect a blended family.
- House value increase: If your estate now exceeds £2 million, the residence nil‑rate band may be affected.
For blended families, trusts can be especially delicate. Read our guide How Life Insurance Trusts Protect Blended Families and Second Marriages from Inheritance Disputes.
Mistake #7: Incorrectly Assigning Ownership of the Policy
If you want to move an existing life insurance policy into a trust, you can assign the legal ownership to the trustees. However, if the assignment is not completed correctly – for example, if the insurer doesn’t record the change – the policy remains yours. On death, HMRC ignores the trust and taxes the payout.
Always confirm with your insurer in writing that the policy ownership has been transferred to the trustees. Keep a copy of the assignment deed and the insurer’s acknowledgment.
How to Avoid Every Mistake – A Simple Plan
Here’s a bullet‑proof checklist to keep your life insurance trust fully IHT‑efficient:
- ✅ Write the policy in trust at the time of purchase.
- ✅ Choose the right trust type (bare vs discretionary) based on your family situation.
- ✅ Never name “my estate” as beneficiary.
- ✅ Have the trust deed witnessed by someone independent.
- ✅ Avoid any settlor‑interested provisions.
- ✅ Review the trust every 2–3 years or after a major life event.
- ✅ Confirm the policy assignment with your insurer.
Still unsure? The book Life Insurance Made Simple: A Clear and Practical Guide for Every Stage of Life (rated 4.8) dedicates a full chapter to trusts and IHT planning. It’s a worthwhile investment for anyone with a life insurance policy.
Real‑Life Example: The Cost of One Mistake
Consider a family in Manchester. They had a £500,000 life policy written in trust since 2015. In 2022, they divorced, but the trust still named the ex‑spouse as the sole beneficiary. The policyholder remarried and died in 2024. Because the trust was not updated, the payout went to the ex‑spouse – and worse, due to a technical defect in the trust deed (no witness), HMRC classed the payout as part of the estate. The 40% charge destroyed £200,000 of the death benefit.
A simple annual review would have caught the issue. Don’t let this happen to your family.
Final Thoughts
A life insurance trust is a powerful IHT‑saving tool – but only if it’s set up and maintained correctly. The mistakes outlined above are all too common, and each one can cost your beneficiaries tens or even hundreds of thousands of pounds.
Take the time to get it right. Work with a specialist solicitor, use the resources recommended here, and review your trust regularly. Your family will thank you for it.
For more foundational knowledge, start with What Is a Life Insurance Trust in the UK and How Does It Cut Inheritance Tax?. Then explore our full series on Life Insurance Trusts: Dodging the Inheritance Tax Bullet to become fully confident in your planning.