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Title Tag: Simultaneous Death Estate Planning (2026): The 120-Hour Rule Explained - ProbatePedia

Meta Description: When two people die in the same accident, the order of death determines who inherits what — and the tax bill can differ by hundreds of thousands of dollars. The Uniform Simultaneous Death Act and the 120-hour survival rule govern this scenario. Here's what your will must say to protect your family.

Simultaneous Death Estate Planning (2026): The 120-Hour Survival Rule

Last Updated: March 2026 • UPC §2-702; Uniform Simultaneous Death Act• Beneficiary Death Series — Article 4 of 6

Why the Order of Death Matters — The Stakes

| ContentHusband Dies FirstContentWife Dies FirstContentTax / Distribution Difference** | | --- | --- | --- | --- | | Husband's $5M estate → Wife, then to children | Wife survives even briefly: $5M passes to Wife estate-tax-free (marital deduction); Wife's estate ($10M+ total) then owes estate tax on everything above exemption at her death | Wife treated as predeceasing: $5M passes directly to children per Husband's will; uses Husband's $15M federal exemption; $0 federal estate tax on $5M | Significant: if Wife survives even one hour, estate tax deferral applies but portability/AB trust planning is triggered; if Wife treated as predeceasing, direct transfer to children may be more tax-efficient — depends on total estate size | | Both die in same plane crash; no will provision on simultaneous death | Courts must determine order of death — often impossible; separate probate proceedings for each estate; potential for two sets of estate taxes without marital deduction coordination | Same chaos from other direction | Without explicit 120-hour clause: property may bounce between estates; double probate; possible loss of marital deduction if simultaneous death prevents orderly transfer; family left with protracted legal dispute | | Parent and child die together in accident; parent's estate → child | Child briefly survives parent: parent's estate passes to child; child's estate (now holding parent's property) passes to child's heirs — two probate proceedings, two estates | Child treated as predeceasing (120-hour rule): parent's estate goes directly to contingent beneficiaries; one probate; simpler administration | 120-hour rule prevents double administration; property goes to the right people without court determination of order of death |

The 120-Hour Rule — State Law Survey

| Content120-Hour Survival Rule?ContentGoverning StatuteContentNotes** | | --- | --- | --- | --- | | UPC States (most states) | YES — 120-hour survival required | UPC §2-702 and state equivalents | UPC states: AK, AZ, CO, FL, HI, ID, ME, MA, MI, MN, MT, NE, NJ, NM, ND, SC, SD, UT, and others — ⚠ verify current full list | | California | YES — 120-hour survival required | Cal. Prob. Code §220 (simultaneous death); §21109 (survival requirement) | CA requires survival by 120 hours; if order of death unknown, each treated as predeceasing the other for their own property; can be modified by instrument | | New York | YES — but only requires survival by a 'sufficient duration' under EPTL §2-1.6; specific period not fixed at 120 hours by statute | EPTL §2-1.6 | NY allows courts to use evidence; NY Estates Powers & Trusts Law §2-1.6 provides that if survivorship cannot be established, each is treated as predeceasing for purposes of their own property; will can specify 120-hour or other period | | Texas | YES — 120-hour survival required under TX UPC (Tex. Est. Code §121.052) | Tex. Est. Code §121.052 | TX follows 120-hour rule; can be modified by instrument | | Florida | YES — 120-hour survival required (F.S. §732.601 and §732.603) | F.S. §732.601 | FL requires 120-hour survival for intestate succession; will can override | | Illinois | YES — 120-hour survival (755 ILCS 5/2-a) | 755 ILCS 5/2-a | IL follows 120-hour rule for intestacy; will should specify |

The 'Common Disaster' Clause — Essential Will Language

A 'common disaster' or 'simultaneous death' clause in a will or trust explicitly addresses what happens if you and your primary beneficiary die within a short period of each other. Without this clause, your will is silent on the scenario and the state's default 120-hour rule (or common law) controls — which may or may not produce the result you want.

Recommended Common Disaster Clause Language (Consult Your Attorney to Adapt):

Standard 30-day survival clause: 'A beneficiary must survive me by thirty (30) days to receive any gift under this Will. If a beneficiary fails to survive me by thirty days, such beneficiary shall be treated as having predeceased me for all purposes of this Will.' — NOTE: A 30-day survival period is longer than the 120-hour default and provides more certainty in disaster scenarios. However, for the marital deduction to apply to a transfer to a surviving spouse, the IRS requires that the survival period not exceed 6 months (IRC §2056(b)(3)). Using a survival period longer than 6 months for spousal gifts eliminates the marital deduction. For non-spouse beneficiaries, there is no IRS restriction on the survival period length.

| ContentMarital Deduction Safe?ContentBest UseContentTradeoff** | | --- | --- | --- | --- | | 120 hours (5 days) — UPC default | Yes | Matches state default; minimal modification needed | Very short; property still passes through two rapid estates if one party survives by days | | 30 days | Yes — under 6 months | Standard choice; balances administrative simplicity with meaningful survival period | Slightly longer probate delay possible in edge cases | | 6 months | Yes — exactly at IRC §2056(b)(3) limit for spousal gifts | Maximum period for spousal bequests while preserving marital deduction | At the outer limit for spouse; not recommended to exceed for any spousal gift | | More than 6 months (for spouse) | NO — marital deduction LOST; estate tax owed at first death on spousal bequest | Should not be used for spousal bequests | Losing marital deduction on large estate can trigger millions in avoidable estate tax | | More than 6 months (for non-spouse) | N/A — no marital deduction at issue | Theoretically permissible for non-spouse gifts; unusual | Extended survival periods can leave estate administration in limbo; rarely used beyond 30–90 days |

Beneficiary Designations — Simultaneous Death on IRA and Life Insurance

The 120-hour rule applies to wills and trusts through state statute. But what about retirement accounts and life insurance? These are governed by the beneficiary designation form and contract terms — not automatically by state law.

| ContentDefault Rule if Both Owner and Primary Beneficiary Die TogetherContentPlanning Solution** | | --- | --- | --- | | IRA — both spouses die together | IRA custodian uses beneficiary designation; if primary beneficiary also deceased, contingent beneficiary takes; if no contingent, IRA goes to estate | Name contingent beneficiaries; consider per stirpes election; confirm with your IRA custodian whether their contract incorporates a 120-hour survival requirement | | 401(k) — common disaster | Plan document controls; ERISA plans vary; most require beneficiary to survive by some period or use USDA default | Check your specific plan's simultaneous death provisions with HR; name contingent beneficiary | | Life insurance — insured and named beneficiary die together | Policy contract controls; most modern life insurance policies include a survivorship clause (usually 30–60 days); if neither the insured nor beneficiary survives the other by the stated period, proceeds go to contingent beneficiary or to the insured's estate | Verify your policy's simultaneous death / survivorship clause; name contingent beneficiary; if group life through employer, check plan document |

Estate Tax Planning for Simultaneous Death

📋 Married Couple — Car Accident — Who Should Be Treated as Surviving?

John ($8M estate) and Mary ($2M estate) die in a car accident. Federal exemption: $15M/person. No federal estate tax for either.

Scenario A — John treated as predeceasing (Mary 'survived' under 120-hour rule by dying 5 days later): • John's $8M → Mary (marital deduction; $0 estate tax at John's death) • Mary's combined estate: $10M → children • Mary's portability election: ports John's unused $15M; total exemption $30M; $0 tax at Mary's death • Result: $0 federal estate tax

Scenario B — Mary treated as predeceasing John (Mary died within 120 hours of John): • John's $8M → children directly (per John's will; no marital deduction needed; under $15M exemption) • Mary's $2M → per Mary's will • Both estates: $0 federal tax • Result: $0 federal estate tax — same result here because both estates are under $15M

The scenario matters more when the combined estate exceeds one person's exemption — proper will drafting and trustee flexibility ensure the optimal tax result regardless of which order of death is legally presumed.

✅ Simultaneous Death Planning Checklist

• Ensure will and trust include explicit survival clause: '30-day survival required to receive any gift' (or 120 hours if preferred)
• For spousal gifts: confirm survival period is 6 months or less to preserve marital deduction (IRC §2056(b)(3))
• Name contingent beneficiaries on all retirement accounts and life insurance with per stirpes election
• Confirm with IRA custodian and 401(k) plan whether simultaneous death survivorship provisions are in their documents
• If in a non-120-hour state (verify current state law): consider adding explicit 120-hour survival requirement in will
• Review estate plan if you frequently travel with your primary beneficiary — disaster scenario planning is practical, not morbid
• Trustee flexibility provision: consider giving trustee discretion to choose whether to assert or waive the survival requirement based on tax and family circumstances

✅ Verified Data — March 2026

• UPC §2-702: 120-hour survival requirement — confirmed

• Uniform Simultaneous Death Act (USDA): original 1940 act; revised 1993 version aligns with UPC 120-hour rule — confirmed

• Cal. Prob. Code §220: 120-hour survival in CA — confirmed

• NY EPTL §2-1.6: survivorship based on evidence; each treated as predeceasing if order cannot be established — confirmed

• Tex. Est. Code §121.052: 120-hour survival in TX — confirmed

• F.S. §732.601 (FL): 120-hour survival for intestacy — confirmed

• IRC §2056(b)(3): marital deduction conditioned on survival period not to exceed 6 months — confirmed

• 120-hour rule applies to wills and intestacy; life insurance and retirement account survivorship requirements governed by contract/plan document — confirmed

Beneficiary Death — Estate Planning Series:

BD-1 → What Happens If a Beneficiary Dies Before You? Lapse, Anti-Lapse & State Laws

BD-2 → Per Stirpes vs. Per Capita: Which Distribution Method Protects Your Grandchildren?

BD-3 → Contingent Beneficiaries: Your Backup Plan Is More Important Than Your Primary

BD-4 → Simultaneous Death: What Happens When You and Your Heir Die Together?

BD-5 → When a Trust Beneficiary Dies: Remainder Interests, Successor Beneficiaries & Termination

BD-6 → The No-Beneficiary Disaster: What Happens When Your IRA Has No Living Beneficiary

probatepedia.com · /estate-planning/simultaneous-death/ · BD-4 of 6 · v1.0 March 2026