How to complete IHT418: reporting a trust interest, or a trust event as trustee
IHT418 covers a trust interest the deceased could benefit from — filed by the executor as part of IHT400 if that's all it is, or by the trustees themselves if a qualifying interest in possession in the trust has just ended. Which applies is the form's first real question, and it changes everything that follows.
The form has been substantially rewritten in its 04/26 edition for a rule that changed on 6 April 2025, when trust IHT exposure stopped following the settlor's domicile and started following their 'long-term UK residence' status instead — a genuinely new test, not a renamed old one.
This walkthrough covers both paths: what an executor needs to report a trust interest on IHT400, and what a trustee needs to establish before reporting the event itself — including when the residence test means the trust needs a solicitor, not a walkthrough.
United Kingdom·Informational, not legal or financial advice·Verified against GOV.UK, 2026
This walkthrough takes the IHT418 form field by field, in plain English. Most of it is administrative — the difficulty is knowing which boxes actually matter, and the one most families get wrong.
The thing most people get wrong
Treating this as a form any lay executor can complete alone — the 04/26 edition of IHT418 is not the simple 2-page schedule older guides describe.
From 6 April 2025, whether trust assets sit inside or outside the IHT net depends on the settlor's 'long-term UK resident' status — a rolling 10-out-of-20-tax-years residence test that has REPLACED domicile for this purpose — not on where the trust was set up or what the trust deed says about domicile. A trust that was safely 'excluded property' under the old domicile rules can have fallen into full UK IHT exposure on 6 April 2025 without a single document changing, purely because the settlor's own residence history crossed the 10-year line.
If you're a trustee working out whether this applies — or an executor, and the trust the deceased benefited from was set up while the deceased or their late spouse lived abroad — get a solicitor or accountant to check the long-term-residence position before relying on any assumption carried over from pre-2025 advice.
The form, in summary
Valoren
IHT418·13 pages·108 fields guided
With Valoren1.5 hours with the trust deed, beneficiary detail, and residence facts already in the vault
Without Valoren3–8 hours
if you're the executor reporting a straightforward UK life interest; considerably longer as trustee if the settlor's UK residence history has to be established from scratch
IHT418 is used two different ways, and Section C of the form itself asks which applies to you.
As an EXECUTOR OR ADMINISTRATOR: if the deceased had the right to benefit from a trust — most often a life interest their late spouse's will created, or a family trust they were a named beneficiary of — this form tells HMRC what that trust interest was worth, so it can be included correctly (or, if it's a genuine future-only right, excluded) from the IHT400 account. You fill in Section D only.
As a TRUSTEE: if a qualifying interest in possession in the trust has ended because someone has died, this form reports that event to HMRC, separately from — and sometimes instead of — any IHT400 the deceased's own estate may be going through. You fill in Sections E through I plus the declaration.
A separate IHT418 is required for each individual trust — if the deceased benefited from three trusts, that is three completed forms.
·Who Files — The executor or administrator (Section D only), the trustee (Sections E–I), or the same person acting in both capacities
·13 pages · 108 fields guided
·Draws from your Estate File — Legal Instruments, Succession Plan, Kinship & Succession Map
Section01
§11
Section 1
The first decision: which path applies to you
IHT418's own Section C asks this before anything else, and it determines which of the rest of the form you complete. Get this right first — the two paths barely overlap.
01
You're the executor or administrator only
If you're dealing with the deceased's own estate and they simply had the right to benefit from a trust someone else set up, complete Section A (naming the trust), Section B (the trustees' details), Section C (ticking 'executor or administrator'), and Section D. You do not touch Sections E onward.
02
You're the trustee (or both)
If a qualifying interest in possession in the trust has ended because someone died — whether or not that death also triggers the main IHT400 — you complete Sections E through I and the declaration. If you're acting as both the deceased's executor and a trustee of the trust, this is the path you take, not Section D.
03
One trust, one form
If the deceased could benefit from more than one trust, each needs its own IHT418 — do not try to combine them onto a single schedule even if the trusts share the same trustees or professional adviser.
IHT418's own Section C asks this before anything else, and it determines which of the rest of the form you complete. Get this right first — the two paths barely overlap.
HM Revenue & Customs (HMRC) · IHT418❦
Section02
§22
Section 2
Section D — reporting a trust interest as executor
This is the path most readers are here for: an ordinary executor who has found the deceased was named in a trust and needs to know what it does to the IHT400. Estimated values are acceptable here where exact figures aren't available.
01
Identify the type of interest first (D1)
Before valuing anything, check whether the deceased's interest is one of the specific categories the form lists: an interest in possession that started before 22 March 2006 and has continued unbroken, an immediate post-death interest, a disabled person's interest, a transitional serial interest, or a purchased interest in possession.
If none of these apply, the trust's value generally sits outside this schedule and the answer routes you to D4 instead of D2.
02
Assets in the trust — D2 and D3
D2 is for houses, land, businesses, and shares/securities that gave the deceased control of the company held within the trust. D3 is for everything else — bank accounts, quoted shares without control, and similar.
The split matters because these categories are valued and reported differently elsewhere in the IHT400 account; don't lump everything into D3 for convenience.
03
A future-only right — D4 to D7
If the deceased's right to the trust's assets only arises after someone else's benefit ends (for example, someone else currently receives the income, and the deceased's estate won't get anything until that person also dies), this is reported separately at D6 — the estimated value goes to IHT400 box 76, not into the main trust-interest total.
Name and age of the person currently benefiting go at D7.
This is the path most readers are here for: an ordinary executor who has found the deceased was named in a trust and needs to know what it does to the IHT400. Estimated values are acceptable here where exact figures aren't available.
HM Revenue & Customs (HMRC) · IHT418❦
Section03
§33
Section 3
Sections E and beyond — trustee reporting, and the residence test
If you've reached this section as a trustee, the form now needs facts about both the person who died and the settlor who created the trust — because since 6 April 2025, the settlor's UK residence history, not domicile, decides how much of the trust is in scope.
01
About the person who died (E1–E7)
Standard identifying detail, plus their marital status and — critically — whether the event being reported happened before or on/after 6 April 2025.
This date split runs through the rest of Section E, because it decides whether the OLD domicile-based questions or the NEW long-term-residence questions apply to this particular event.
02
The long-term-residence branch (E7a–E7c, E24–E31)
For events on or after 6 April 2025, the form asks whether the person who died — and separately, the settlor — was a 'long-term UK resident' at the relevant date. A 'No' answer routes to a separate schedule (D31 or D31a) rather than continuing in the main form.
This is where the form genuinely departs from anything a pre-2025 trust filing looked like, and it is the section most likely to need a professional's input rather than a best guess.
03
About the settlor (E17–E23)
The person who created the trust, not necessarily the person who has just died — a trust can run for decades after its settlor's own death, with the settlor's historic domicile or residence status still governing how it's taxed today.
Get their name, dates, and residence history from the trust deed and any earlier IHT filings the trust has made, not from memory.
If you've reached this section as a trustee, the form now needs facts about both the person who died and the settlor who created the trust — because since 6 April 2025, the settlor's UK residence history, not domicile, decides how much of the trust is in scope.
HM Revenue & Customs (HMRC) · IHT418❦
Section04
§44
Section 4
Sections F–H — the schedules, the assets, and where totals go
Once the identity and residence questions are settled, Sections F–H are more mechanical: which supporting schedules apply, what the trust holds, and the liabilities/reliefs that reduce the chargeable total.
01
Section F — which schedules to attach
A checklist of supporting schedules (D32–D39) triggered by what the trust holds — stocks and shares, loans from the trust, insurance policies, land, Agricultural or Business Relief claims, or assets outside the UK.
Tick every box that applies; each triggers its own supporting form rather than being answered inline on IHT418 itself.
02
Section G — UK assets, column A vs column B
Eighteen categories of UK asset (G1–G18), each split between Column A (tax not payable by instalments) and Column B (tax that can be paid by instalments — broadly land, businesses, and control holdings of shares).
The totals at G19 and G20 carry the two columns forward separately through the rest of the form — they are never combined.
03
Section H — liabilities, exemptions, reliefs, and the grand total
Liabilities are deducted per column (H1/H2), then exemptions and reliefs — including Agricultural and Business Relief, entered per item with the rate claimed (100% or 50%, following the same 6 April 2026 cap that applies on IHT412) — at H3/H4.
The chargeable totals (H5/H8), any foreign-asset additions, and the grand total at H11 are the figures the tax on this event is calculated from.
Once the identity and residence questions are settled, Sections F–H are more mechanical: which supporting schedules apply, what the trust holds, and the liabilities/reliefs that reduce the chargeable total.
HM Revenue & Customs (HMRC) · IHT418❦
Section05
§55
Section 5
Getting it right — TRS, and when to bring in a professional
Three things trip up trustees specifically, separate from the valuation questions above.
01
The Trust Registration Service is a separate duty
Completing IHT418 does not register the trust with HMRC — that's the Trust Registration Service, a separate ongoing duty most UK trusts have (register within 90 days of creation or of becoming tax-liable; keep it updated within 90 days of any change).
Check the trust's TRS status while you're gathering this form's facts, since the two are often out of date together.
02
The residence test is not a DIY judgement call
Working out 10-out-of-20-tax-years UK residence for a settlor with an international history — years abroad, split years, historic domicile elections — is genuinely technical, and getting it wrong changes whether IHT is due on the trust's non-UK assets at all, not just the amount.
If there is ANY question mark over the settlor's residence history, get a solicitor or accountant who handles international trusts before signing the declaration.
03
Every liable person signs
The declaration requires every person liable to pay the tax to sign — for a trust with multiple trustees, that usually means all of them, not just whoever is completing the paperwork. Confirm who is 'liable' for this specific chargeable event before assuming one trustee's signature is sufficient.
Three things trip up trustees specifically, separate from the valuation questions above.
HM Revenue & Customs (HMRC) · IHT418❦
Many people file IHT418 themselves — that is what this walkthrough is for. If the estate behind it has stopped being simple — inheritance tax to pay, a trust, foreign assets, a dispute — Signum, Valoren’s own specialist desk, can take it on, and we say so plainly: it starts with a free intake, and if you do not need us, we will tell you. Prefer an independent adviser? STEP and the Chartered Institute of Taxation both keep public member directories, and neither pays Valoren a referral fee.
FAQ
IHT418 questions, answered.
01Do I need to fill in IHT418 at all?›
Only if the deceased had the right to benefit from a trust — most commonly a life interest under a late spouse's will, or being a named beneficiary of a family trust with a right to income or occupation.
If there's no trust involved anywhere in the estate, skip this schedule entirely. If there is, a separate IHT418 is needed for EACH trust the deceased could benefit from — not one form covering all of them.
02What's the difference between filling this in as executor and as trustee?›
As executor or administrator of the deceased's own estate, you complete Section D only — reporting the value of the deceased's interest in the trust so it's correctly reflected (or correctly excluded, if it was a future-only right) on the main IHT400.
As trustee, you complete Sections E through I — reporting that a qualifying interest in possession in the trust has ended, with detail about the settlor, the trust's assets, and any reliefs claimed. If you're both the deceased's executor AND a trustee of the trust, you fill in the trustee sections (E–I), not Section D.
03What is a 'qualifying interest in possession'?›
A right to the income from, or use of, trust assets that HMRC treats as if the beneficiary owned the underlying assets outright for IHT purposes — so when that right ends (usually on the beneficiary's death), it's a chargeable event for the trust, similar to a death.
The form lists the specific categories that still qualify: an interest that started before 22 March 2006 and has continued unbroken, an 'immediate post-death interest' created by a will, a disabled person's interest, a transitional serial interest, or a purchased interest in possession. An interest that doesn't fit one of these categories is usually taxed under the separate 'relevant property' trust rules instead, which this form does not cover.
04What changed with 'long-term UK residence' from 6 April 2025?›
Before the reform, whether a trust's non-UK assets fell inside UK Inheritance Tax depended on the settlor's DOMICILE when they set the trust up — a status that, once acquired, could effectively last a lifetime for trust purposes even if the settlor later left the UK for good.
From 6 April 2025, that test was replaced with 'long-term UK resident' (LTR) status: broadly, having been UK tax-resident for at least 10 of the previous 20 tax years. A trust's IHT exposure now tracks the settlor's LTR status year by year — if the settlor becomes an LTR, a previously 'excluded property' trust can fall into full UK IHT exposure on that date, and if they later cease to be one, exposure can fall away again. This is a genuinely new, rolling test, not a renamed version of the old domicile rule — do not assume pre-2025 trust advice still holds without rechecking it.
05Does my trust need to be registered with HMRC's Trust Registration Service?›
Almost certainly, if you're filling in the trustee sections of this form. Most UK trusts must register on the Trust Registration Service within 90 days of being created (or of becoming liable for tax, if later), and trustees must keep the register updated within 90 days of any change.
Check the trust's TRS status and update it as part of dealing with this event — HMRC can cross-reference the two, and an out-of-date TRS entry is a separate compliance gap from anything reported on IHT418 itself.
06Where do the totals from IHT418 end up on the main IHT400?›
If you're the executor completing Section D only, the total at D2 plus D3 folds into the value of the deceased's interest in possession that's included in the estate; a future-only right at D6 is included separately at IHT400 box 76.
If you're the trustee completing the full Sections E–I, the asset totals at G19 (not payable by instalments) and G20 (payable by instalments) carry through Section H's liabilities and reliefs to the chargeable-value totals at H5 and H8; any foreign-asset additions then take those to H7 and H10, and the grand total at H11 is the figure the tax due on this event is calculated from — separately from, though often alongside, the deceased's own IHT400.
07Can I complete the trustee sections myself, or do I need a solicitor?›
A straightforward UK-resident, UK-asset-only trust with a clear beneficiary and no residence-status complications is realistic for an organised trustee to complete directly, using the IHT400 Notes' guidance for form IHT418.
The moment the settlor spent significant time outside the UK, the trust holds foreign assets, or you're not confident about the settlor's residence history over the last 20 tax years, the long-term-residence schedules (D31, D31a, D31b) genuinely need a solicitor or accountant who works with international trusts — this is one of the more complex corners of the current IHT system, and getting the residence test wrong changes whether tax is owed at all, not just how much.
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Where this fits
IHT418 is one form. The file behind it is the rest.
The trustee sections live or die on facts most families have never written down anywhere: when the trust started, who the settlor was, and where that settlor actually lived across the years that now decide the trust's UK tax exposure.
The Legal Instruments record is where the trust deed itself should already sit; the Succession Plan carries the beneficiary detail; the Kinship & Succession Map — built to carry exactly this — records each family member's domicile and long-term-UK-residence facts before anyone has to reconstruct them under time pressure.
When you're ready — not before — our £179 Executor's First Hour walks you through registering the death, notifying banks and pensions, and getting probate started, in the right order. The free checklist above covers the essentials; this is for when you'd rather have a hand to hold. Executor's First Hour — £179 →
HM Revenue & Customs (HMRC)·108 fields·No separate fee — a schedule to IHT400 (or the equivalent trust event report)·1.5 hours (with the trust deed, beneficiary detail, and residence facts already in the vault) with Valoren
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