Excepted Estate UK: Do You Need to Complete an IHT400? Rules, Thresholds, and What Disqualifies You (2026)
Most estates under £1m with zero IHT do NOT need to submit an IHT400 — they qualify as excepted estates under the 2022 rules. Understanding the three categories and the disqualifying features can save executors weeks of administration.
| Category | Threshold | Exempt Assets | Key Conditions | IHT400 Required? |
|---|---|---|---|---|
| Low value estate | Gross estate ≤ £325,000 (NRB) | Any exemptions (but total gross estate including exempt amounts ≤ £325k) | UK domiciled; no more than one non-UK asset (≤ £100,000); no chargeable settled property; no GWR assets; no more than £150,000 in specified transfers (s8WA IHT regulations) | NO |
| Exempt estate | Gross estate ≤ £3,000,000 | Entirely exempt: ALL assets pass to UK-domiciled surviving spouse/civil partner (s18 IHTA) or qualifying charity (s23 IHTA) — or a combination | UK domiciled; no more than one non-UK asset (≤ £100,000); no chargeable settled property; no GWR assets; first spouse's tNRB may be included in transitional calculation but not required for this category | NO |
| NRB/transitional estate (surviving spouse) | Net estate ≤ NRB + tNRB (up to £650,000 combined) AND gross estate < £3,000,000 | Standard exemptions (debts deducted); the available tNRB from deceased first spouse's unused NRB is taken into account to increase the threshold above £325k up to £650k | UK domiciled; no more than one non-UK asset (≤ £100,000); no chargeable settled property; no GWR assets; IHT = £0; tNRB must be available (first spouse must have left unused NRB) | NO |
| NRB estate (not surviving spouse — single person) | Net estate ≤ £325,000 (no tNRB available for a non-surviving spouse) AND gross estate < £3,000,000 | Standard deductions (debts) to reach net estate ≤ £325k | UK domiciled; no settled property; no GWR; non-UK assets ≤ £100k; IHT = £0; no specified transfers > £150,000 in 7yr | NO (if all conditions met) |
| Estate that FAILS excepted estate conditions — IHT400 REQUIRED | Any estate NOT meeting the above criteria | N/A — any IHT due requires IHT400 | Any of: non-UK domicile; non-UK assets > £100,000; chargeable settled property; GWR assets in estate; IHT > £0; gross estate > £3m; chargeable lifetime transfers > £150k in 7yr | YES — IHT400 required |
| RNRB and excepted estates — interaction | RNRB up to £175k; with tNRB + tRNRB up to £1m combined thresholds for couple | RNRB does NOT automatically make an estate excepted — an estate with RNRB available still needs the GROSS estate to be within £3m (for exempt/NRB categories) | If estate is < £1m net and IHT = £0 after NRB + RNRB + tNRB + tRNRB: check whether gross estate < £3m to confirm excepted estate status. In practice, most estates that are IHT-zero with NRBs and RNRBs will have gross estate < £3m | NO if also meets other excepted estate conditions |
Excepted estate regulations: The Inheritance Tax (Delivery of Accounts) (Excepted Estates) Regulations 2004 (SI 2004/2543) as amended by SI 2021/1166 (effective 1 January 2022). Three categories: (1) Low value: gross ≤ £325k (NRB); (2) Exempt: gross ≤ £3m AND wholly exempt (all to UK-domiciled spouse/CP or charity); (3) NRB/transitional: net ≤ available threshold (NRB + tNRB up to £650k) AND IHT = £0 AND gross < £3m. Disqualifying: non-UK domicile; non-UK assets > £100k; chargeable settled property; GWR (s102 FA1986); IHT > £0; gross > £3m. Process for excepted estates: estate info in probate application (PA1P/PA1A); no IHT400; no IHT421; no pre-probate IHT payment. HMRC inquiry window: s218A IHTA 1984 — 24 months from grant of probate. RNRB (s8D IHTA): not automatic even for excepted estates; executors should confirm conditions met in writing. Scotland: Inheritance Tax (Delivery of Accounts) (Excepted Estates) (Scotland) Regulations apply separate rules (Scottish confirmation procedure). England and Wales primary focus here. IHT400 + schedules: IHT402 (tNRB); IHT403 (gifts); IHT405 (property); IHT411 (listed shares); IHT413 (BPR); IHT414 (APR); IHT435 (RNRB — NOT automatic); IHT436 (tRNRB — NOT automatic); IHT430 (36% reduced rate). IHT421: issued by HMRC post-IHT400; required for non-excepted estates before grant of probate.
Excepted Estates: Complete Guide
What is an excepted estate and why it matters
An 'excepted estate' is an estate where the simplified IHT reporting process applies — the executors do NOT need to submit a full IHT400 (Inheritance Tax Account) to HMRC. The term comes from The Inheritance Tax (Delivery of Accounts) (Excepted Estates) Regulations 2004 (SI 2004/2543) and subsequent amendments. The most significant amendment was SI 2021/1166 (The Inheritance Tax (Delivery of Accounts) (Excepted Estates) (Amendment) Regulations 2021), which took effect on 1 January 2022 and substantially updated the rules. Why it matters: completing the full IHT400 and its supplementary schedules is a significant administrative burden — the form can run to 20+ pages with additional schedules for each asset type, supplementary forms for BPR, RNRB, gifts, foreign assets, and more. Submitting the IHT400 also involves paying IHT before probate can be granted (creating the IHT 'catch-22'), waiting for HMRC to process the return and issue the IHT421 (clearance to release to the probate registry), and potentially months of delay. For excepted estates: executors simply provide estate information within the probate application (PA1P for a will; PA1A for intestacy), confirm that the estate qualifies as excepted, and apply for the grant of probate — no IHT400, no IHT421, no pre-probate payment. This simplifies and accelerates the probate process significantly.
The three categories of excepted estate (from 1 January 2022)
From 1 January 2022, an estate qualifies as an excepted estate if it falls into one of three categories: Category 1 — Low value estate: the gross estate (before deducting debts/liabilities) does not exceed £325,000. This category is simple: if the total value of all the deceased's assets (UK and foreign) is £325k or less, and the other conditions are met (UK domicile; no more than one foreign asset worth ≤ £100k; no chargeable settled property; no GWR assets), the estate is excepted. Category 2 — Exempt estate: the gross estate does not exceed £3,000,000 AND the estate is wholly exempt from IHT — meaning all assets pass to the UK-domiciled surviving spouse or civil partner (under the s18 IHTA unlimited spousal exemption) and/or to qualifying charities (s23 IHTA). If EVERY asset in the estate goes to a spouse/CP or charity (nothing goes to children or others), the estate is exempt and the IHT bill is £0 regardless of the value — the £3m cap simply prevents very large estates from using this simplified process. The other conditions (no foreign assets > £100k; no chargeable settled property; no GWR; UK domicile) also apply. Category 3 — NRB/transitional estate: the gross estate does not exceed £3,000,000 AND the net estate (after deducting funeral expenses, debts, and liabilities) does not exceed the available IHT threshold for that estate. The available threshold is typically the NRB (£325k) plus any transferable NRB from a deceased spouse/CP (tNRB — up to 100% of the first NRB = £325k; total combined up to £650k). If the net estate is within the available threshold AND IHT = £0: excepted estate (provided no foreign assets > £100k, no settled property, no GWR, UK domicile).
What disqualifies an estate from excepted estate status
Several features disqualify an estate from excepted estate treatment even if it is below the relevant threshold: (1) Non-UK domicile: if the deceased was not domiciled in the UK at death (including long-term UK residents who have not established UK domicile), the estate is not an excepted estate — the full IHT400 is required. A deemed-domiciled individual (10 of 20 tax years UK resident under the LTUKR rules from Finance Act 2025, or the old 15-year deemed domicile pre-April 2025) IS treated as UK-domiciled for IHT and the excepted estate rules apply normally. (2) Foreign assets exceeding £100,000: if the deceased owned non-UK assets (foreign property, overseas bank accounts, foreign shares) worth more than £100,000 in total, the estate cannot be excepted — the full IHT400 and supplementary schedule for foreign assets are required. (3) Chargeable settled property: if there is settled property (trust property) that is chargeable to IHT on the deceased's death — for example, because the deceased was the life tenant of a trust that passes IHT-chargeable assets — the estate is not excepted. Exception: a bereaved minor's trust or 18-25 trust that is not chargeable to IHT on the deceased's death does not disqualify. (4) Gifts with Reservation: if the deceased made a gift but retained a benefit (GWR — s102 FA1986) and the gifted asset would therefore be treated as remaining in the estate, the estate is not excepted — the GWR asset inflates the estate value. (5) Chargeable lifetime transfers above threshold: if the deceased made chargeable lifetime transfers (CLTs — gifts to discretionary trusts or similar) in the 7 years before death exceeding £150,000, the estate may be disqualified from certain excepted categories. (6) IHT > £0: if the net estate (after all deductions and exemptions) results in any IHT being due (even a small amount), the estate cannot be excepted — a full IHT400 must be filed and the IHT paid. (7) Gross estate > £3m: for exempt and NRB categories, the gross estate must not exceed £3m.
The process for excepted estates — probate without IHT400
For estates that qualify as excepted, the process is significantly simpler: (1) Gather estate information: the executors still need to value all assets and liabilities accurately — the fact that an IHT400 is not required does not mean the estate does not need to be valued. Accurate valuations are still needed for the probate application and for HMRC's potential inquiry. (2) Probate application: since the reform of the probate application process, executors apply for a grant of probate online or using form PA1P (testate — where there is a will) or PA1A (intestate — no will). The estate information (asset values, liabilities, net estate, gross estate) is provided as part of the probate application — the applicant confirms whether the estate is excepted and what the values are. (3) No IHT400 submitted: unlike non-excepted estates, the executors do not submit an IHT400 to HMRC's IHT team (HMRC Trusts and Estates). (4) No IHT421 required: the IHT421 (which HMRC issues after processing the IHT400 and then sends to the probate registry) is not needed for excepted estates — the probate registry accepts the grant application without an IHT421. (5) No pre-probate IHT payment: for excepted estates, there is no IHT due (IHT = £0), so there is no pre-probate payment hurdle. The probate application can be made as soon as the estate information is ready. (6) Grant of probate: the probate registry processes the PA1P/PA1A and grants probate in the usual way. HMRC inquiry window: even for excepted estates, HMRC retains the right to open an inquiry into the estate under s218A IHTA 1984. The inquiry window is 24 months from the date of the grant (for excepted estates) or 24 months from the date the IHT400 was accepted (for non-excepted). Within the inquiry window, HMRC can request estate information and challenge the excepted estate status if it has reason to believe the estate does not qualify.
RNRB and tRNRB for excepted estates — the practical interaction
A common question: if an estate uses the RNRB (s8D IHTA — £175k per person) and/or tRNRB (s8G IHTA — transferred RNRB from a deceased spouse/CP) to achieve IHT = £0, does the estate need to formally claim these on IHT435/IHT436, or does the excepted estate process bypass that? The answer: for a strictly excepted estate (no IHT400 submitted), the RNRB and tRNRB do not need to be claimed on separate forms as part of the probate application in the same way they would on IHT400. However: (a) The RNRB and tRNRB are NOT automatic — they are reliefs that should be confirmed as applying. For a non-excepted estate, HMRC specifically requires IHT435 (RNRB claim) and IHT436 (tRNRB claim) — they are emphatically NOT automatic and must be actively claimed. (b) For excepted estates that rely on the RNRB/tRNRB to achieve IHT = £0 (e.g., a £750k estate where NRB £325k + RNRB £175k = £500k, and the tNRB £325k + tRNRB £175k covers the rest): the estate IS over the basic NRB threshold and relies on the RNRB and tRNRBs to be IHT-zero. If the estate is excepted, these amounts are effectively applied by the executors when confirming the estate is IHT-zero. However: if HMRC later opens an inquiry, the executors may need to demonstrate that the RNRB/tRNRB conditions were met. Good practice: even for excepted estates, keep a written record of how the RNRB and tRNRB conditions are satisfied (home passed to direct descendants; tRNRB percentage from first death; IHT436 equivalent calculation). Some solicitors choose to submit an IHT400 and IHT435/IHT436 voluntarily even for estates that might technically qualify as excepted, particularly for complex estates where there could be doubt — the formal IHT400 process creates a clear HMRC-approved record that all claims were made.
Frequently Asked Questions
Do I need to fill in an IHT400 for an excepted estate?
No — an excepted estate does not require a full IHT400 return. An estate is excepted if it falls into one of three categories (from 1 January 2022 — SI 2021/1166): (1) Low value: gross estate ≤ £325,000, UK-domiciled, no foreign assets > £100k, no settled property, no GWR; (2) Exempt: gross estate ≤ £3m AND all assets pass to surviving UK-domiciled spouse/civil partner or qualifying charity; (3) NRB/transitional: net estate ≤ available NRB threshold (up to £650k with transferred NRB from first spouse) AND IHT = £0 AND gross < £3m. For excepted estates, executors provide estate information as part of the probate application (PA1P/PA1A) and apply for probate without submitting an IHT400 or receiving an IHT421 from HMRC. HMRC retains a 24-month inquiry window (s218A IHTA) to challenge the excepted estate status.
What is the excepted estate threshold for inheritance tax in the UK (2026)?
There is not a single threshold — it depends on the category: (1) Low value excepted estate: gross estate ≤ £325,000 (the NRB). This is the simplest category — if all assets total £325k or less, and no disqualifying features apply (non-UK domicile, foreign assets > £100k, settled property, GWR), the estate is excepted. (2) Exempt excepted estate: gross estate ≤ £3,000,000 AND the estate is entirely exempt (everything passes to surviving UK-domiciled spouse/civil partner (s18 IHTA) or qualifying charity (s23 IHTA)). (3) NRB estate: net estate ≤ NRB (£325k for a single person) or NRB + tNRB (up to £650k for a surviving spouse using the transferred NRB from the first spouse's estate) AND IHT = £0 AND gross estate < £3m. These thresholds apply from 1 January 2022 following SI 2021/1166.
What disqualifies an estate from being an excepted estate?
An estate is disqualified from excepted estate treatment by any of: (1) Non-UK domicile of the deceased at death; (2) Non-UK assets worth more than £100,000 in total; (3) Chargeable settled property in the estate (trust property chargeable to IHT on the deceased's death); (4) Gifts with reservation (GWR — s102 FA1986) — assets the deceased gifted but in which they retained a benefit, which are treated as remaining in the estate for IHT; (5) Any IHT liability (IHT > £0); (6) Gross estate exceeding £3,000,000 (for exempt and NRB categories); (7) Net estate exceeding the available NRB threshold (£325k for a single person; up to £650k if tNRB available). If any of these apply, a full IHT400 must be submitted to HMRC.
Do you need an IHT421 for an excepted estate?
No — an IHT421 is not required for an excepted estate. The IHT421 is a document HMRC issues after processing the IHT400 (the full inheritance tax return); it confirms the IHT position and is sent to the probate registry, allowing the grant of probate to be issued. For excepted estates, no IHT400 is submitted and no IHT421 is issued. The probate registry processes the application (PA1P or PA1A) without needing an IHT421. This significantly speeds up the probate process for excepted estates, as executors do not need to wait for HMRC to process the IHT400 and issue the IHT421 before probate can be granted.
Can HMRC investigate an excepted estate?
Yes — HMRC retains the right to open an inquiry into any estate, including excepted estates, under s218A IHTA 1984. For excepted estates, HMRC has a 24-month window from the date the grant of probate is issued to open an inquiry. If HMRC opens an inquiry, it can request the full estate information (asset valuations, details of gifts, trust information, foreign assets) and challenge whether the estate genuinely qualified as excepted. If HMRC determines that the estate was incorrectly treated as excepted (e.g., the gross estate exceeded £3m, or there was a GWR asset that was not disclosed), it can require a full IHT400 to be submitted and IHT, interest, and potentially penalties to be paid. Good practice: even for excepted estates, executors should keep detailed records of how they established the estate qualifies — asset valuations, confirmations of no GWR, no foreign assets over £100k, etc.
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