Survivorship Clauses in Wills and IHT: The 30-Day Rule, Commorientes, and Double-Death Tax Planning
A 30-day survivorship clause prevents double estate administration when spouses die close together — but if the surviving spouse dies in the survivorship window, the spousal IHT exemption is lost and assets pass to children taxed from the first death. Section 92 IHTA prevents double taxation during the period, but the NRB, RNRB, and TRNRB positions all need careful thought.
IHT Implications of the Survivorship Clause
Why survivorship clauses are used
A survivorship clause (also called a 'survivorship period' or '30-day clause') requires a named beneficiary to survive the testator for a specified period (commonly 28 or 30 days) in order to inherit under the will. Without such a clause: if a husband and wife die in a common accident (or very close together), and the wife is deemed to have survived the husband by seconds (under the commorientes presumption — that where the order of death is uncertain, the younger is presumed to have survived), the wife's estate includes the husband's assets but she has no will (or her will goes to different beneficiaries), creating complex double administration. The survivorship clause addresses this by saying: if my wife does not survive me by 30 days, my estate passes as if she predeceased me.
IHT when the spouse fails the survivorship period
If the will leaves assets to a spouse subject to a 30-day survivorship clause, and the spouse dies within the 30 days, the gift to the spouse lapses — the assets pass to the substituted beneficiaries (typically children) as if the spouse had predeceased the testator. IHT consequence: the spousal exemption does not apply. The assets pass directly to the substituted beneficiaries — taxed against the NRB in the usual way at the first death. No spousal exemption. This may be unavoidable if both spouses die in close proximity, but it should be understood that the survivorship clause has this effect.
IHT when the spouse satisfies the survivorship period
If the spouse survives for 30+ days, the gift to the spouse takes effect and the spousal exemption applies — no IHT on the first death on assets passing to the surviving spouse. The surviving spouse's estate includes the inherited assets and faces IHT on the second death. The transferable nil rate band (TNRB) of the first-dying spouse is available to the surviving spouse's estate (unused NRB proportion transferred). The RNRB and transferable RNRB (TRNRB) are available on the second death if the estate includes a qualifying residential property passing to lineal descendants.
The commorientes rule and its interaction with survivorship clauses
The commorientes presumption (s184 Law of Property Act 1925) provides that where two or more people die in circumstances where the order of deaths cannot be established, they are presumed to have died in seniority order — the older person is presumed to have died first. This means: if husband (70) and wife (65) die together in an accident, the wife is presumed to have survived the husband. Without a survivorship clause: the wife's estate includes the husband's assets (passed under the spousal exemption) but may then pass to different beneficiaries under the wife's will or intestacy. With a 30-day survivorship clause: the wife must survive for 30 days — if she dies within 30 days (or simultaneously), the substitution takes effect. The clause effectively sidesteps the commorientes presumption for wills purposes.
Survivorship clause and the Residence Nil Rate Band
The RNRB (up to £175,000 per individual) requires the qualifying residential property to pass to direct descendants. If the survivorship clause causes the property to pass to a child directly (because the spouse did not survive 30 days), the RNRB may apply at the first death — provided the child is a direct descendant and the property qualifies. Conversely, if the property passes to the surviving spouse (who satisfies the survivorship period), the RNRB is not available at the first death — but the transferable RNRB (TRNRB) can be claimed against the surviving spouse's estate on the second death (when the property passes to descendants). Planning: where the estate exceeds the combined NRB (£650,000 for couples) and the RNRB and TRNRB are important, the survivorship period should be carefully considered in the will structure.
The survivorship clause and s142 deed of variation
Where a spouse satisfies the survivorship period and inherits, but then makes a deed of variation within 2 years of the first death redirecting the inherited assets to the children, the deed of variation is read back for IHT as if the original will had made the gift directly to the children (s142 IHTA 1984). This can allow the RNRB to be used at the first death (if the property passes to descendants under the variation) and avoid IHT on the surviving spouse's second estate. A deed of variation is a powerful post-death planning tool that can correct an inefficient survivorship clause outcome — provided it is executed within 2 years of the first death and all necessary conditions are met.
Frequently Asked Questions
How long should the survivorship period be — 7, 14, 28, or 30 days?
The standard period in professionally drafted wills is 30 days (some use 28 days for brevity). There is no fixed rule — the period is a matter of drafting choice. A shorter period (7-14 days) reduces the risk that the spousal exemption is lost if a spouse survives for only a few days (the 30-day clause would cause the substitution to apply even if the spouse was expected to survive but died in week 3). A longer period (3-6 months) is unusual and creates practical administration difficulties. For most wills, 30 days is the standard — it avoids the commorientes problem and double administration while not materially delaying the practical effect of the gift. Note: IHTA 1984 s92 provides a special rule for IHT where property is held for a beneficiary during a survivorship period — the period can be up to 6 months without affecting the IHT treatment of the gift.
Does IHT s92 affect the IHT position during the survivorship period?
Section 92 IHTA 1984 provides that where a will creates a disposition subject to a survivorship period not exceeding 6 months, the property is treated as if it passed directly to whoever is entitled after the survivorship period — not as a gift that was first to the primary beneficiary and then redistributed. This means: (1) during the survivorship period, no transfer of value occurs for IHT — the estate simply holds the assets pending the outcome; (2) if the primary beneficiary (e.g. spouse) survives the period, the IHT treatment is as if the gift had been made directly (spousal exemption applies); (3) if the primary beneficiary dies in the period, the substituted beneficiary takes and IHT is calculated as if the original testator had made the gift directly to the substitute. This avoids a double-tax problem: without s92, the assets passing to a beneficiary who then dies within the period could be taxed twice (once in the testator's estate and once in the primary beneficiary's estate).
Should married couples both have survivorship clauses in their wills?
Yes — standard practice is for both spouses to have mirror wills with matching survivorship clauses. If only one will has a 30-day clause and the other does not, asymmetric results arise depending on which spouse dies first. Where both wills have a 30-day survivorship clause: whichever spouse dies first, the survivor must survive 30 days to inherit under the first will. If both die simultaneously or within 30 days of each other, the estate of each passes to the substituted beneficiaries under their respective wills. This is typically the intended outcome for couples who want their children to inherit even in a rapid succession scenario.
What happens if there is no survivorship clause and spouses die close together?
Without a survivorship clause: if the order of death is established (e.g. one spouse died first in hospital records), the first spouse's estate passes to the second spouse (under the will or intestacy), including the spousal exemption. The second spouse's estate then faces IHT on the combined assets (with two NRBs available). If the order of death is uncertain (commorientes situation), the LPA 1925 s184 presumption applies — the elder spouse dies first. Without a survivorship clause, the younger spouse's estate includes the elder's assets — which then pass under the younger spouse's will or intestacy. This may produce unintended results (e.g. the assets go to the younger spouse's family under their will rather than to the children of the marriage).
Can a survivorship clause affect who qualifies as executor or trustee?
A survivorship clause only affects the beneficial entitlement to the estate — not necessarily the appointment of executors or trustees. Most wills appoint executors and trustees separately from the beneficial gifts. However, where a spouse is appointed as both executor and sole beneficiary, and they fail the survivorship period, substitute executor and beneficiary provisions should be included. A well-drafted will includes: (1) primary and substitute executors; (2) primary and substitute beneficiaries (with survivorship periods); (3) a default trust or residue provision if all primary beneficiaries fail. Reviewing these provisions is part of regular will review — especially after significant family events (deaths of named executors, births of children, etc.).
Review Your Will's Survivorship Clause Today
A well-drafted survivorship clause protects against the commorientes problem and double administration — but must be structured to work with your NRB, RNRB, and overall estate plan. Start with a WillSafe will kit and ensure the substitution provisions reflect your true wishes.
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