Estate Planning for Widows and Widowers: What to Do — and When — After Losing a Spouse

Losing a spouse triggers a cascade of financial and legal decisions, several with hard deadlines that can cost millions if missed. This guide covers the decisions that matter most for high-net-worth surviving spouses: the portability election window, step-up in basis at first death, the spousal IRA rollover choice, DSUE pitfalls, and the IRMAA filing-status shift that arrives 3 years later.

1. The portability election: 9 months to preserve $15,000,000 of estate tax shelter

Under IRC §2010(c), the surviving spouse may use their deceased spouse's unused federal estate tax exemption — the Deceased Spouse's Unused Exclusion (DSUE). In 2026, the federal exemption is $15,000,000 per individual (made permanent by the OBBBA, July 2025).¹ A spouse who dies with a $4M estate leaves behind $11M of DSUE. The surviving spouse can stack that $11M on top of their own $15M exemption — sheltering up to $26M from federal estate tax.

But portability is not automatic. The executor must elect it by filing Form 706 within 9 months of the date of death. If more time is needed, Form 4768 provides a 6-month automatic extension (bringing the deadline to 15 months).²

What if the deadline was missed?

Rev. Proc. 2022-32 provides a simplified late-election procedure for estates that were not otherwise required to file Form 706 (i.e., estates under the filing threshold). The executor may file a complete Form 706 within 5 years of the decedent's date of death and include a notation at the top: "FILED PURSUANT TO REV. PROC. 2022-32 TO ELECT PORTABILITY UNDER §2010(c)(5)(A)." No private letter ruling is required.³

2. Step-up in basis at first death — the largest capital gains event in most estates

Under IRC §1014, assets included in a decedent's gross estate receive a new cost basis equal to fair market value at the date of death. Appreciated assets that would have triggered capital gains tax if sold during life inherit a zero-gain basis — eliminating the embedded tax.

For a widow or widower, the extent of the step-up depends entirely on how title was held:

What this means in practice

A surviving spouse in California, Texas, Arizona, or another community property state who inherits a $3M stock portfolio that was purchased for $500,000 can immediately sell that portfolio without paying capital gains tax on the $2.5M gain — because both spouses' shares step up to $3M at the first death.

A surviving spouse in New York, Florida, or most other states who holds the same $3M portfolio as JTWROS inherits a basis of roughly $1.75M ($500K original basis × 50% + $3M × 50% step-up), and would owe capital gains tax on the $1.25M of remaining gain if they sell.

The step-up in basis also resets the depreciation basis for real estate, though depreciation previously claimed is not recaptured at death — the heir's basis is the full FMV. See the step-up basis calculator to model the hold-versus-gift trade-off for your specific assets.

3. Spousal IRA rollover vs. inherited IRA — the most consequential retirement account decision

A surviving spouse is the only beneficiary who can treat an inherited IRA as their own — rolling it into their own IRA and subjecting it to their own rules rather than inherited-IRA rules. This election has significant consequences in either direction and deserves careful analysis before acting.

Option A: Roll the inherited IRA into your own IRA

• RMDs start at your own Required Beginning Date — age 73 for those born 1951–1959; age 75 for those born 1960 and later (SECURE 2.0 §107).⁵ If the deceased spouse was older than you, rolling to your own IRA delays RMDs to your own RBD.
• Roth conversions are fully available. You can convert traditional IRA funds to Roth at any time, subject to ordinary income tax.
• 10% early withdrawal penalty applies if you are under age 59½ and take distributions. This is the trap: if you roll the IRA into your name and then need money before 59½, you pay a 10% penalty.
• Best for: surviving spouses who are at least 59½, or who don't need distributions soon.

Option B: Keep it as an inherited IRA

• Distributions avoid the 10% early withdrawal penalty regardless of your age — inherited IRAs are exempt from the IRC §72(t) penalty. If you're under 59½ and need access, the inherited IRA is the right choice initially.
• RMD timing: If the deceased spouse had reached their Required Beginning Date, inherited-IRA distributions follow the annual RMD rules under T.D. 10001 (you must take RMDs each year, not defer to year 10).⁶ If the deceased had not yet reached their RBD, you may elect the life-expectancy method or the 10-year rule.
• Best for: surviving spouses under age 59½ who may need distributions before they reach that age.

The wait-and-see strategy

You do not have to decide immediately. A common approach: elect the inherited IRA initially, use it for distributions if needed before 59½ without penalty, and then rollover to your own IRA once you reach 59½. At that point you gain full Roth conversion access and your own RBD timeline. Work with an advisor before executing either election — the wrong sequence can trigger unnecessary tax or penalties.

IRA balance at death: the IRD trap

IRAs do not receive a step-up in basis. Every dollar a beneficiary withdraws is taxed as ordinary income — the income tax the decedent deferred is still owed by the estate and beneficiaries as income in respect of a decedent (IRD) under IRC §691. For large traditional IRAs, the double-tax exposure (estate tax on the IRA balance, then income tax on withdrawals) is the most common multi-million-dollar planning mistake. See IRA & Retirement Account Estate Planning for the full strategy framework.

4. Revising the estate plan: what to update immediately

The death of a spouse renders multiple documents stale or legally incorrect. The following should be reviewed within 60–90 days:

Beneficiary designations

Beneficiary designations on IRAs, 401(k)s, life insurance policies, TOD brokerage accounts, and HSAs control those assets regardless of what a will or trust says. If the deceased spouse was named as primary beneficiary, that designation must be updated immediately. Review and update the complete list of accounts — primary and contingent beneficiaries. See Beneficiary Designations: Estate Planning Guide for the full checklist.

Revocable trust: trustee succession

If the deceased spouse was a co-trustee or successor trustee of a revocable living trust, a new successor trustee must be named. Trust assets that were managed jointly will now have a single trustee; confirm the trust document clearly names an alternate or successor and that person is aware of and willing to serve.

Powers of attorney and advance directives

If the deceased spouse was named as agent under the surviving spouse's durable power of attorney or as healthcare agent in the advance healthcare directive, those documents now point to an agent who cannot act. New documents designating alternate agents must be executed promptly — particularly the healthcare directive, which is needed any time the surviving spouse has a medical procedure.

Pour-over will

The pour-over will may name the deceased spouse as executor or primary beneficiary. If so, a new will should be drafted to appoint an alternate executor and confirm the trust structure remains the intended destination for probate assets.

QTIP trust income

If the estate plan includes a QTIP trust — funded at the first death to provide income to the surviving spouse while controlling ultimate distribution to children — the surviving spouse must begin receiving the QTIP income annually to maintain the marital deduction. Work with the trustee to establish the income-distribution schedule.

5. IRMAA and Medicare: the filing-status shock that arrives 3 years later

Medicare Part B and Part D premiums include an Income-Related Monthly Adjustment Amount (IRMAA) surcharge for higher earners. In 2026, the surcharge begins at $109,000 MAGI for single filers and $218,000 MAGI for married filing jointly.⁷ The base Part B premium is $202.90/month; with surcharges, it can reach $689.90/month.

The IRMAA calculation uses your income from 2 years prior (so 2026 IRMAA is based on 2024 MAGI). This creates a delayed impact when a spouse dies:

A surviving spouse with $180,000 in investment income pays no IRMAA surcharge when filing MFJ ($218K threshold). The same income filing single in 2027 clears the $109,000 threshold and triggers tier-2 or tier-3 surcharges. The premium increase can exceed $3,000 per year.

Planning opportunity in the year of death: With the larger MFJ brackets and higher standard deduction in place for the last time, consider accelerating income — a Roth conversion, capital gains realization, or deferred compensation payout — before year-end. Also consider IRMAA appeal via Form SSA-44 if your income dropped materially in the year following the spouse's death.

6. Year-of-death tax planning: the last joint return

In the year a spouse dies, the surviving spouse may generally file a married filing jointly return for the full calendar year — even if the death occurred on January 1.⁸ MFJ status provides:

• The standard deduction of $32,200 vs. $16,100 single (2026)
• Wider ordinary income tax brackets
• Roth conversion capacity at lower marginal rates (for estates in the $2M–$10M range where 37% isn't universal)
• Lower capital gains tax thresholds

Surviving spouses with a dependent child may qualify for qualifying widow(er) filing status for 2 additional tax years after the year of death, continuing to use MFJ rates — though most HNW families have adult children who do not qualify as dependents.

7. Social Security survivor benefits

A surviving spouse can begin receiving Social Security survivor benefits as early as age 60 (age 50 if disabled). The Social Security Fairness Act (signed January 2025) repealed the Windfall Elimination Provision (WEP) and Government Pension Offset (GPO) — eliminating reductions that previously affected surviving spouses who had government pensions.⁹

Strategy for maximizing survivor benefits:

• If the deceased spouse had a larger Social Security benefit: take survivor benefits at the optimal age, delay your own benefit to 70 to maximize it (if your own benefit will ultimately be larger), then reassess.
• If your own benefit will be larger: take survivor benefits early (as early as 60), then switch to your own maximized benefit at 70.
• The two benefits cannot be combined — you receive whichever is higher.
• Survivor benefit taken before full retirement age is permanently reduced (up to 28.5% reduction at age 60).

8. Estate planning action checklist for surviving spouses

Sources

1. IRS — Tax Year 2026 Inflation Adjustments (OBBBA) (federal estate and gift tax exemption $15,000,000 for 2026; permanent per OBBBA, signed July 4, 2025)
2. IRS — Frequently Asked Questions on Estate Taxes (Form 706 9-month deadline; Form 4768 6-month extension; portability election mechanics under IRC §2010(c))
3. IRS Revenue Procedure 2022-32 (simplified late portability election within 5 years of date of death for estates not required to file Form 706; supersedes Rev. Proc. 2017-34)
4. IRC §1014 — Basis of property acquired from a decedent (Cornell LII) (step-up in basis rules; §1014(b)(6) community property double step-up at first death)
5. IRS — Retirement Topics: Required Minimum Distributions (SECURE 2.0 RMD age 73 for born 1951–1959; age 75 for born 1960+; spousal rollover RBD rules)
6. T.D. 10001 (July 2024) — Final RMD Regulations (inherited IRA annual RMD requirement when decedent had reached Required Beginning Date; 10-year rule mechanics)
7. SSA POMS HI 01101.020 — IRMAA Sliding Scale Tables (2026 IRMAA thresholds: single $109,000 first tier, MFJ $218,000 first tier; Part B base premium $202.90; surcharge range $284.10–$689.90)
8. IRS Publication 501 — Filing Status (married filing jointly available for the full year in which spouse dies; qualifying widow(er) status for 2 subsequent years with qualifying dependent)
9. SSA — Social Security Fairness Act (January 2025) (WEP and GPO repealed effective for benefits payable January 2025 and later; survivor benefits no longer reduced for government pension recipients)

Values verified as of May 2026: federal estate exemption $15,000,000 (OBBBA/IRS 2026 adjustments); IRMAA 2026 single tier-1 threshold $109,000, MFJ $218,000 (SSA POMS); Part B base premium $202.90 (CMS 2026); standard deduction MFJ $32,200 / single $16,100 (IRS Rev. Proc. 2025-28); annual gift exclusion $19,000 (IRS Rev. Proc. 2025-28); Rev. Proc. 2022-32 5-year late portability election window.