For cross-border couples the practical IHT question is which spouse holds long-term-resident status, and what that means for transfers between them. The post-Finance-Act-2025 spouse exemption at IHTA 1984 section 18 produces three different outcomes across the four possible combinations of spouse-LTR-status; the section 267ZC election can rescue the worst-of-the-four quadrant where the transferor is LTR and the receiving spouse is not. Both pieces are spousal-only: there is no freestanding "any individual can elect into LTR treatment" route in the post-FA-2025 framework.

This page is the multi-statute companion to the s.6A LTR test pillar and the s.48ZA trust-side companion. The s.6A pillar covers how to determine LTR status for the individual analysis; the s.48ZA companion covers offshore-trust mechanics; this page covers the spouse-to-spouse transfer mechanics under s.18, the s.18(2A) by-reference cap, and the SPOUSAL s.267ZC election. The three pages form the operational Wave 8 IHT cluster; cross-references are noted at each point.

The s.18 architecture: unlimited vs limited spouse exemption

Section 18 has two operative substantive subsections. Section 18(1) provides the headline unlimited exemption:

"A transfer of value is an exempt transfer to the extent that the value transferred is attributable to property which becomes comprised in the estate of the transferor's spouse or civil partner or, so far as the value transferred is not so attributable, to the extent that that estate is increased."

Section 18(2) introduces the limited exemption in the specific cross-border scenario:

"If, immediately before the transfer, the transferor but not the transferor's spouse or civil partner is a long-term UK resident, the value in respect of which the transfer is exempt (calculated as a value on which no tax is chargeable) shall not exceed the exemption limit at the time of the transfer, less any amount previously taken into account for the purposes of the exemption conferred by this section."

The precondition for s.18(2) is precise: the transferor must be LTR AND the transferor's spouse or civil partner must NOT be LTR. The cap applies only in this one-way direction. All other combinations of LTR status fall back on the s.18(1) unlimited exemption. Sessions and adviser pages that frame the cap as applying broadly to any cross-border couple are over-extending the statutory wording.

The s.18(2A) by-reference cap

Section 18(2A) defines the exemption limit:

"For the purposes of subsection (2), the exemption limit is the amount shown in the second column of the first row of the Table in Schedule 1 (upper limit of portion of value charged at rate of nil per cent)."

The cap is calibrated by-reference to the Schedule 1 NRB upper limit, which is currently £325,000 for tax year 2026-27 and (per the Autumn Budget 2024 announcement) frozen through 5 April 2030. The by-reference framing means the cap automatically tracks any future NRB change: if the NRB rises (or, less likely, falls), the s.18(2) cap follows automatically without further statutory amendment. The same rate-by-reference discipline appears elsewhere in UK tax statute (the ITA 2007 s.8(2) cross-reference for the Personal Allowance; the CTA 2010 small-profits-rate threshold) and Wave 8 has flagged it as a consistent drafting style across recent Finance Acts. Adviser pages that hard-code £325,000 into s.18(2) advice carry a built-in obsolescence risk on any future NRB change; the by-reference framing remains correct through any rate adjustment.

The four-quadrant matrix

Cross-border couples fall into one of four quadrants based on each spouse's LTR status under s.6A. The s.18 analysis produces three distinct outcomes across the four quadrants:

Transferor LTR?Receiving spouse LTR?s.18 outcome
YesYess.18(1) unlimited exemption (s.18(2) cap precondition requires receiving spouse to be non-LTR; not met).
YesNos.18(2) limited exemption applies; cap by-reference at £325,000 (2026-27). Non-LTR receiving spouse can elect under s.267ZC to remove the cap, at the cost of bringing worldwide assets into UK IHT scope for the election period.
NoYess.18(1) unlimited exemption (s.18(2) cap precondition requires transferor to be LTR; not met).
NoNos.18(1) unlimited exemption (s.18(2) cap precondition not met). The transferor's non-LTR status means worldwide non-UK assets are outside UK IHT scope under s.6 in any event, so the exemption is structurally less consequential.

The cap therefore bites in one of the four quadrants only. The other three quadrants give the unlimited s.18(1) result. The decision question for couples sitting in the second quadrant is whether to leave the cap operative (£325,000 of headroom) or to elect under s.267ZC to access the unlimited s.18(1) result (at the cost of bringing the non-LTR spouse's worldwide assets into UK IHT scope).

The s.267ZC SPOUSAL election: verbatim Conditions A and B

Section 267ZC of the Inheritance Tax Act 1984 (inserted by Finance Act 2025) provides a spousal-only election into long-term-resident treatment. The two qualifying conditions are at subsections (3) and (4):

Condition A (s.267ZC(3) verbatim):

"Condition A is that, at any time within the period of 7 years ending with the date on which the election is made, P had a spouse or civil partner who was a long-term UK resident."

Condition B (s.267ZC(4) verbatim):

"Condition B is that a person ('the deceased') dies and, at any time within the period of 7 years ending with the date of their death, the deceased was: (a) a long-term UK resident, and (b) the spouse or civil partner of P."

Condition A is the lifetime route: P (the non-LTR individual electing in) needs a spouse or civil partner who has been LTR at some point within the 7 years preceding the election date. Condition B is the post-death route: P (the surviving non-LTR spouse) needs a deceased spouse or civil partner who was LTR within the 7 years preceding their death; the election may be made by P or by the deceased's personal representatives, per s.267ZC(2).

Both conditions require a SPOUSAL connection (spouse or civil partner) to an LTR individual. There is no freestanding route under s.267ZC for an unrelated non-LTR individual to elect into LTR treatment; the section is calibrated specifically for cross-border couples. Sessions and adviser pages that describe s.267ZC as a "generic LTR election" or imply that any non-LTR individual can elect are wrong; the spousal-connection gateway is mandatory.

The effect of an election and the cost-benefit decision

Section 267ZC(1) provides that an individual making a valid election is treated as a long-term UK resident while the election remains effective. The effect is two-sided. On the spouse-exemption side, the s.18(2) cap is removed (because the formerly-non-LTR spouse is now LTR, so the precondition for s.18(2) is no longer met and s.18(1) unlimited exemption applies). On the worldwide-asset side, the electing individual is treated as LTR for the entire IHT regime: their worldwide assets are within UK IHT scope under s.6 for as long as the election is effective.

The economic decision is whether the spouse-exemption savings exceed the additional IHT exposure on the electing individual's non-UK assets. The break-even threshold depends on three variables: the size of intended spouse-to-spouse transfers (and the headroom needed above the s.18(2) cap), the size of the electing individual's non-UK estate, and the time horizon over which the election will remain effective.

For couples with substantial transfers needed in one direction (LTR-to-non-LTR transferor giving more than £325,000 of headroom to a non-LTR receiving spouse) and limited non-UK assets on the receiving spouse's side, the election is IHT-positive. For couples where the non-LTR spouse has substantial non-UK assets (overseas property, foreign pensions, foreign investments) but the intended cross-spouse transfer is modest, the election can be IHT-negative; the additional IHT exposure on the non-UK assets exceeds the spouse-exemption savings.

Worked example: the Bahari-Wright couple

Take a hypothetical couple, Mr Bahari and Mrs Wright. Mr Bahari has been UK-resident for 20 of the previous 20 tax years and is clearly LTR under s.6A; his estate consists of a £1.6m UK BTL portfolio and £900k of UK situs investments (UK SIPP and UK investment accounts). Mrs Wright is an Australian national. She was UK-resident from 2010-11 to 2014-15 (6 years), moved to Sydney in 2015, and has not been UK-resident since; she has been non-LTR throughout the post-FA-2025 period. Her estate consists of £700k of Australian assets including her Sydney residence and an Australian superannuation.

Without a s.267ZC election. On Mr Bahari's death, his estate passes to Mrs Wright. Section 18(2) applies (LTR transferor, non-LTR receiving spouse). The cap removes only £325,000 of the transfer from IHT scope. The remaining £2,175,000 of UK situs estate (£2.5m total estate minus £325k spouse exemption) is taxed in Mr Bahari's death estate. With the standard nil-rate band of £325,000 and full residence nil-rate band of £175,000 (if the property passes to direct lineal descendants per will or by default; ignoring the £2m taper if the estate is reduced by spouse exemption to under £2m), the chargeable value is roughly £1,675,000 at 40%, an IHT charge of approximately £670,000.

With a s.267ZC election by Mrs Wright (Condition B is satisfied: Mr Bahari was LTR within 7 years before death AND was her spouse). Mrs Wright is treated as LTR. Section 18(1) gives unlimited spouse exemption on Mr Bahari's death; the £2.5m UK situs estate passes to Mrs Wright IHT-free on first death. The cost: Mrs Wright's £700k Australian assets are now within UK IHT scope for the election period. On her later death (or earlier disposal events), those assets are in scope at 40%, an additional IHT charge of approximately £280,000.

The election is therefore IHT-positive: £670,000 saved on first death minus £280,000 additional exposure on second death equals a net £390,000 saving across the couple's lifetime. The numbers shift significantly with different mix of UK and non-UK assets; a smaller non-UK estate on Mrs Wright's side (say, £200k of Sydney assets only) reduces the additional exposure to £80,000 and pushes the net saving higher. A larger non-UK estate (say, £2m of Australian commercial property) flips the analysis; the additional exposure exceeds the spouse-exemption savings and the election is IHT-negative.

The s.267ZD procedural mechanics: timing and revocation

Section 267ZD sits alongside s.267ZC and provides the procedural framework for the SPOUSAL LTR election. The substantive election is at s.267ZC; the timing rules, conditions for cessation, and procedural requirements (including the form and content of the election notice) sit at s.267ZD.

Three procedural points matter for advice work. First, the election timing. A lifetime Condition A election can be made at any time while the spousal connection within the 7-year window is satisfied; a post-death Condition B election can be made by the surviving spouse or by the personal representatives within the timeframe set by s.267ZD. Sessions advising on a specific election should verify the s.267ZD timing window for the particular case before recommending. Second, the election effect on the s.18 spouse exemption flows immediately from the election effective date; transfers between spouses after that date attract the s.18(1) unlimited treatment. Third, the election effect on the IHT scope of the electing individual's worldwide assets also flows from the election effective date forward; assets owned before the election remain subject to the analysis applicable to the individual's status as at the relevant chargeable event.

The election is intended to provide tax certainty for cross-border couples and is constrained in its revocability. Sessions advising should not assume free revocability; the decision is structural and should be tested under different asset-mix scenarios before commitment.

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How does the s.6 excluded-property limb interact with the quadrant analysis?

For the LTR-LTR quadrant, the s.6 excluded-property test is not engaged for the LTR transferor's worldwide assets, which are all within UK IHT scope. The transfer is exempt under s.18(1) and goes into the receiving LTR spouse's estate at full value. For the non-LTR / non-LTR quadrant, s.6 brings the receiving spouse's UK situs assets into UK IHT scope but leaves their non-UK situs assets outside the regime entirely; the s.18(1) spouse exemption applies to the transfer but the substantive IHT exposure is limited to UK situs property in either spouse's hands.

For the LTR transferor / non-LTR receiving spouse quadrant, the analysis runs in two stages. On the LTR transferor's death (or lifetime transfer), the transferor's worldwide assets are in UK IHT scope under s.6; s.18(2) caps the amount that passes spouse-exempt at the s.18(2A) by-reference cap; the excess is in the LTR transferor's chargeable estate. The non-LTR receiving spouse's pre-existing non-UK assets are outside UK IHT scope under s.6; the receiving of the spouse-exempt slice does not bring those non-UK assets into scope. For the non-LTR transferor / LTR receiving spouse quadrant, the transferor's non-UK assets are outside UK IHT scope under s.6 (only UK situs assets are in scope); the s.18(1) unlimited exemption applies on the transfer; the receiving LTR spouse picks up the transferred UK assets at full value into their LTR-status estate.

The s.267ZA legacy election and the 6 April 2032 close-out

Section 267ZA is the pre-FA-2025 legacy election. It was narrowed by Finance Act 2025 Schedule 13 such that the spousal connection date in s.267ZA's conditions must be before 6 April 2025 within the 7-year window. The section remains available for transitional cases until 6 April 2032, when FA 2025 Schedule 13 paragraph 45 (commencement) repeals it together with the procedural s.267ZB.

The seven-year deferred repeal is designed to preserve the legacy spousal-connection election gateway through to the 2031-32 tax year, then close. Sessions and adviser pages that describe s.267ZA as having "no automatic repeal date" are working from incomplete reading of Schedule 13 paragraph 45; the 2032 date is hard.

For elections made after 6 April 2032, only s.267ZC will be available, which requires the post-reform LTR spousal connection rather than the pre-reform domicile-based connection. Sessions advising on which section applies to a specific spousal-connection scenario should run the dates carefully: spousal connection where the spouse was UK-domiciled in or before 2024-25 (within the 7-year window working back from the election date), s.267ZA is the route, available through 5 April 2032. Spousal connection where the spouse is or was LTR post-6-April-2025, s.267ZC is the route, available indefinitely on the s.267ZC conditions.

The s.267ZF DTA bridging rule

Section 267ZF provides a bridging rule for double-taxation treaties that still operate by reference to the pre-reform deemed-domicile concept. Older UK treaties (some dating to the 1960s, 1970s, and 1990s) reference deemed-domicile for various definitional purposes (eligibility for certain treaty reliefs, taxation rights over particular asset classes, residence tie-breakers in some cases). These treaties have not all been updated to use long-term-resident terminology; s.267ZF deems an individual to be deemed-domiciled for treaty purposes where they are long-term UK resident under the new s.6A test.

The bridging operates at the treaty level only; for UK domestic IHT analysis, the LTR test under s.6A is the operative concept. Sessions advising on cross-border estate planning should verify the specific UK treaty's wording: modern OECD-style treaties (UK-Luxembourg 2022, UK-Spain 2013, UK-France 2008, the Crown Dependencies treaties from 2018 onwards) typically work cleanly with the LTR framework; older treaties (UK-India 1993, UK-USA 2001, UK-Italy 1968 succession convention) may need the s.267ZF bridge.

What this page does not cover

This page is the spouse-exemption and SPOUSAL election companion. It does not cover: the s.6A LTR test itself (the s.6A pillar covers); the trust-side excluded-property mechanics under s.48ZA (the EPT companion page covers); the second-death window for LTR-LTR couples covered on the second-death window page; the wider Schedule A1 look-through (the IHT non-resident headline page covers); the FIG, TRF, CGT rebasing, and returning-to-UK siblings in Bucket A (each has its own dedicated Wave 8 page).

For the descriptive IHT pillar covering reliefs and the headline charge, see Inheritance Tax on Rental Property Portfolios: UK Guide 2026. For the joint-ownership angle (form 17, declarations of trust, spouse transfers under TCGA s.58), see IHT Joint Ownership and the Spouse Exemption.

Statutory and HMRC sources cited above: Inheritance Tax Act 1984 section 18; Inheritance Tax Act 1984 section 267ZC; Inheritance Tax Act 1984 section 267ZA; Inheritance Tax Act 1984 section 267ZF; Inheritance Tax Act 1984 Schedule 1; Finance Act 2025 Schedule 13; HMRC Inheritance Tax Manual.