When a widowed person remarries, they do not lose their late spouse’s unused estate tax exemption – remarriage alone doesn’t nullify portability, though a future spouse’s death can change which unused exemption applies. Less than 0.1% of U.S. estates owe federal estate tax today thanks to a nearly $14 million per-person exemption, but wealthy couples rely on portability to maximize these tax shields – and second marriages can complicate how this Deceased Spousal Unused Exclusion (DSUE) is preserved or lost.
In this guide, you’ll learn:
- 💰 How remarriage affects your estate tax exemption – unpacking the “last deceased spouse” rule and why your first spouse’s DSUE isn’t automatically lost when you say “I do” again.
- ⚖️ The difference between federal and state laws on portability – and why most states don’t let you double your exemption (hint: only a couple of states allow any portability at the local level).
- 🔄 All possible remarriage scenarios for DSUE: from claiming your first spouse’s unused exemption (or failing to), to what happens if you remarry and use it, lose it, or have multiple late spouses.
- 📑 Real examples and surprising case law that reveal the traps and quirks of portability in blended families – including what courts and the IRS have said about second marriages and the DSUE.
- 🤝 Smart strategies to protect your heirs – how to safeguard both a new spouse and children from a prior marriage, avoid common portability mistakes, and leverage trusts or timing so no exemption goes unused.
Portability After Remarriage: Does a Second Marriage Cancel Your First Spouse’s Exemption?
Remarrying by itself does not cancel the estate tax portability benefit from your first spouse. In plain terms, if your first husband or wife died and you properly elected portability of their unused estate tax exclusion, you retain that deceased spousal unused exclusion (DSUE) amount even after you remarry. The Internal Revenue Code uses a “last deceased spouse” rule: your last deceased spouse is the one whose DSUE you can use. Simply gaining a new spouse doesn’t change who your last deceased spouse is – that remains your prior spouse who passed away. So as long as your new spouse is alive, your last deceased spouse is still your first spouse, and you can continue to use the first spouse’s DSUE for gift and estate tax purposes.
However, the moment another spouse dies, the DSUE equation changes. If your new spouse (Spouse #2) later predeceases you, then Spouse #2 becomes your last deceased spouse. At that time, you lose any remaining DSUE from Spouse #1 and replace it with any DSUE from Spouse #2. In other words, you cannot “stack” two exclusions – you only get one portable exemption, from your most recently deceased spouse. For example, if Mary had $4 million of unused exemption ported from her first husband John, and she then marries Bill: while Bill is alive, Mary’s last deceased spouse is still John, so she can use John’s $4M DSUE towards tax-free gifts or her own estate. But if Bill dies before Mary, John is no longer the last deceased spouse – Bill is. Mary would lose John’s $4M DSUE at that point, and going forward she could only rely on any unused exemption from Bill’s estate (which might be larger, smaller, or nonexistent, depending on Bill’s own finances and prior gifts).
Crucially, remarriage alone doesn’t “reset” your portable exemption – only the death of a new spouse does. This means a surviving spouse can confidently remarry without fear of forfeiting their late partner’s estate tax buffer as long as the new spouse is still living. During this time, the survivor can even utilize the first spouse’s DSUE for lifetime gifts or other planning. In fact, IRS regulations explicitly state that remarriage does not prevent use of the DSUE: you can continue applying your deceased spouse’s unused exclusion toward taxable transfers until you have a new last deceased spouse.
That said, timing and sequence of events matter. The portability rules essentially allow a widowed person who marries more than once to use each late spouse’s unused exemption in succession – but never more than one at any given time. If you’ve outlived two spouses, you could benefit from Spouse #1’s DSUE while married to Spouse #2 (since #1 was your last deceased). Then, if Spouse #2 dies, you swap in #2’s DSUE for future use (and #1’s DSUE is gone). If there’s even a Spouse #3 down the line, the pattern continues: whichever spouse died most recently is the only source of DSUE going forward. You cannot combine DSUE amounts from multiple predeceased spouses simultaneously. The surviving spouse’s own basic exclusion amount (their personal estate tax exemption) remains in place throughout – portability just adds the last spouse’s unused amount on top of it.
Using DSUE vs. losing it – one more nuance of remarriage: If you already used your first spouse’s DSUE (for example, you made large lifetime gifts shielded by that extra exemption) before a new spouse dies, those past uses remain valid. Portability regulations specify that DSUE is applied to gifts before your own exemption. So if Mary from our example had promptly used John’s $4M DSUE to make tax-free gifts to her children, that benefit is locked in – even if Bill later becomes the last deceased spouse, the IRS won’t claw back the exemption already used under John’s DSUE. But any unused portion of John’s DSUE would vanish at Bill’s death. Essentially, remarriage imposes a “use it or lose it” aspect on the first spouse’s ported exemption if the new spouse passes away first.
Finally, consider the scenario where the surviving spouse dies before the new spouse. If you (the original surviving spouse) die while remarried (i.e. your new spouse outlives you), portability still plays out – but now you are the deceased spouse in question. Your estate can only port your unused exemption to your now-widowed new spouse. Any DSUE you had from a prior spouse was part of your own exemption at death, but it doesn’t magically transfer further. For instance, suppose John died and left Mary his unused $4M DSUE, giving Mary a total exemption of, say, $17 million (her $13M basic + John’s $4M). If Mary dies while married to Bill, and she only used $10M of her combined exemption, she has $7M unused. Mary’s executor can elect to port that $7M to Bill. Note that Bill receives Mary’s unused exclusion, not John’s or John’s “separate” DSUE. Mary’s remaining exemption became hers and is now simply the DSUE from Mary to Bill. In other words, DSUE isn’t a hand-me-down that skips through multiple marriages – it gets absorbed by the surviving spouse’s own tax shield. The new spouse can only inherit whatever unused exclusion the immediate decedent (their spouse) had, which may indirectly include remnants of a former DSUE. The key takeaway: portability is always a one-to-one transfer between a decedent and their surviving spouse, limited to that decedent’s unused exclusion (regardless of where that exclusion originated).
In summary, portability after remarriage operates under the last-deceased-spouse-wins principle. You won’t lose your first spouse’s unused exemption merely by getting married again. But if your new husband or wife dies before you, only that latest spouse’s unused exemption can be carried forward – any prior DSUE is gone at that point. This places importance on strategic use of a first spouse’s DSUE if a second marriage is in the picture (more on that in the examples and strategies below). It also means careful estate planning is needed in serial marriages, so each spouse’s legacy and tax exemptions are optimized.
Portability Pitfalls in Second Marriages: Mistakes You Must Avoid
Estate tax portability can save families millions, but second marriages introduce unique traps. Surviving spouses and their advisors should be vigilant about these common mistakes when navigating DSUE after remarriage:
- Failing to Elect Portability for the First Spouse’s Estate: The #1 portability pitfall is simply not filing an estate tax return after the first spouse’s death to secure the DSUE. If your spouse died with unused exemption and the estate didn’t timely file Form 706 to elect portability, that extra exclusion is lost forever. This often happens when the estate’s value was below the filing threshold – families assume no return is needed. Unfortunately, without the election, there is no DSUE to carry over into a new marriage. (The IRS now offers up to 5 years of extended time to file for portability for smaller estates, so if you’re within that window, act fast to avoid permanently wasting the first spouse’s exemption.) Bottom line: Always elect portability when a spouse with unused exemption dies, even if no tax is due, especially if the survivor might remarry or the law might change. It’s a free insurance policy against future estate tax.
- Procrastinating and Losing DSUE to a New Spouse’s Death: As explained, if your new spouse dies and becomes your last deceased spouse, you forfeit any DSUE from a prior spouse. A major mistake is not using the first spouse’s DSUE while you have it – essentially “saving” it, only to have it erased by an untimely death. If there’s a significant age or health difference with your new partner, or you simply want to lock in the benefit, consider using the DSUE sooner. This might mean making large lifetime gifts or other transfers to utilize the extra exclusion. By leveraging your late spouse’s DSUE before it’s potentially replaced, you ensure it benefits your family instead of evaporating. Many widows/widowers who remarry don’t realize this risk until it’s too late. Avoid the regret: if you have a portable exemption and a second marriage, have a plan for that DSUE – either use it or at least monitor your situation (e.g. if your new spouse becomes ill, you might accelerate gift planning).
- Assuming Portability Applies to State Estate Taxes: Federally, portability is well-established, but most states with estate or inheritance taxes do not allow portability of their own exemption. This is a critical oversight in estate planning. For example, if you live in a state like Massachusetts or New York, each spouse has a separate state estate tax exemption (often much lower than the federal). If the first spouse dies and everything goes outright to the survivor, the first spouse’s state exemption can be wasted because states generally don’t let it transfer. Later, when the surviving spouse (perhaps now remarried) dies, the combined estate may face significant state estate tax because only one exemption is available. Exception: a couple of states do permit state portability – notably Hawaii and Maryland have state laws that allow a deceased spouse’s unused state exemption to carry over. But elsewhere, failing to plan means the second-to-die spouse could be hit with state estate tax that could have been avoided. Solution: Use credit shelter trusts or other techniques at the first death in non-portability states to preserve that state exemption, even if you rely on federal portability for the rest.
- Overlooking the Non-Citizen Spouse Trap: Portability has special rules when the surviving spouse is not a U.S. citizen. If you are a non-citizen surviving spouse (even with a green card), you cannot directly inherit unlimited assets tax-free – the law requires a Qualified Domestic Trust (QDOT) to defer estate tax on transfers to a non-citizen spouse. For portability, the first spouse’s estate can still elect DSUE, but the DSUE amount is only preliminary until the QDOT is resolved. In practice, the executor must make a portability election and typically transfer assets to a QDOT to get the marital deduction. The DSUE is then finalized only when either the surviving spouse becomes a U.S. citizen or at their death when the QDOT assets are taxed. The mistake here is thinking a non-citizen will fully benefit from DSUE automatically. If the surviving spouse never becomes a citizen, the DSUE from the first spouse might never be usable for lifetime gifts (since it’s tied up in the trust). And if the non-citizen spouse remarries, it can further complicate the trust and exemption planning. Takeaway: If you or your spouse aren’t U.S. citizens, get specialized advice – you may need to become a citizen by a certain time or ensure a QDOT is properly structured so that portability isn’t lost. (Also note: if the decedent was a nonresident not domiciled in the U.S., they don’t get the normal exemption and no portability election is available under U.S. law.)
- Relying Solely on Outright Portability in a Blended Family: Portability only addresses estate tax; it does not direct where your assets go or protect them for your children. In second marriages, a common pitfall is leaving everything outright to the new spouse (to take advantage of the marital deduction and portability) and assuming your first spouse’s kids or your own kids from a prior marriage will eventually get what’s left. The surviving spouse could use all the assets or redirect inheritances, and portability actually enables them to shelter even more gifts/bequests (possibly to their own children from another relationship) using the DSUE that came from your estate. For example, say Husband dies, leaves everything to his second Wife, and elects portability. Wife now has Husband’s unused $5 million exemption. She can spend or gift Husband’s assets freely – even to her own kids from her first marriage – using that extra exemption to avoid tax. Husband’s children (from his first marriage) may end up with nothing, and the exclusion he “gave” her doesn’t benefit them at all. This unintended outcome is a major pitfall when there are children from a prior marriage or other beneficiaries to protect. Solution: Instead of an outright bequest and portability, consider a trust (like a credit shelter trust or QTIP trust) at the first spouse’s death. A trust can ensure the surviving second spouse is taken care of, but also preserve principal for the first spouse’s children. It can also still be designed to use the first spouse’s exemption (credit shelter trust uses it outright; a QTIP trust can even be combined with portability elections creatively). In short, don’t let portability’s simplicity lure you into an estate plan that ignores family dynamics – use trusts or agreements to balance interests.
- No Agreement or Clarity in Prenuptial Arrangements: Building on the above point, couples entering a second marriage often fail to address portability and estate tax planning in a prenuptial (or postnuptial) agreement. This is a mistake if substantial assets or children from prior marriages are involved. A prenup can specify, for instance, that the surviving spouse will consent to or cooperate with the filing of an estate tax return to elect portability, or conversely, it might limit how a surviving spouse can use any DSUE derived from the first spouse’s estate (to prevent using it all on someone else). It can also waive or solidify rights to demand certain distributions. Without clear agreements, you might see conflict between a surviving spouse and the deceased’s children or executor when it comes to filing for portability or allocating estate tax burdens. Pro tip: Discuss and document these issues in advance – e.g., agree on who pays for the estate tax return preparation if it’s only for portability’s sake, and ensure the executor (if it might be a step-child or someone) is obligated to file for DSUE. Some court cases (like Estate of Vose in Oklahoma) have even held that an executor has a fiduciary duty to elect portability for the spouse’s benefit, but it’s best not to leave it to litigation – a well-crafted agreement can prevent disputes and guarantee that both tax savings and inheritance goals are met.
- Forgetting the 2026 Exemption Sunset (Planning Blind Spot): One often-overlooked factor is that the current historically high estate tax exemption (approximately $12.92 million per person in 2023, rising to ~$13–14 million by 2025) is set to sunset after 2025, potentially dropping to about $6–7 million (per person) in 2026 unless laws change. Couples who think “we’ll never have an estate tax issue” now might be in for a surprise later. Remarriage scenarios can amplify this: imagine a first spouse died in 2024, leaving a $13 million DSUE to the survivor, who then remarries. If the survivor’s new spouse dies in 2026 or beyond when the basic exclusion is much lower, the new spouse’s DSUE could be limited (maybe only $6–7M available), and the large DSUE from the first spouse disappears. This could leave the surviving spouse with a far smaller total exemption than anticipated. A mistake would be complacency – not electing portability or not using the first spouse’s exemption based on today’s high thresholds. As a precaution, treat the first spouse’s DSUE as a valuable one-time opportunity. Also consider that if you do port a large DSUE now, it locks in that amount (DSUE isn’t adjusted down after a law change, so using or securing it before 2026 could be a wise move). Failing to account for law changes or assuming the current exemption will last can be a costly error.
Each of these pitfalls can be managed with proactive planning. Portability is a powerful tool, but in second marriages it should be approached with eyes wide open. Combine it with trusts, timely filing, and open communication among family and advisors to avoid these mistakes. The next sections will illustrate scenarios and strategies to drive these points home, including a look at pros and cons of different approaches to using exemptions in remarriage situations.
Pros and Cons of Relying on Portability in a Second Marriage
When deciding whether to rely on portability (outright transfers + DSUE) versus using trusts or other methods at the first spouse’s death, consider the following trade-offs:
| Pros of Portability (Outright to Spouse & Elect DSUE) | Cons of Portability in Second Marriage |
|---|---|
| Simplicity & Flexibility: Easy to implement – no complex trusts; surviving spouse has full control of assets and can use DSUE freely (e.g., make gifts, reposition assets). | Risk of Losing DSUE: If surviving spouse remarries and the new spouse dies first, the first spouse’s DSUE is gone. Without using it, the benefit could be wasted by circumstances outside your control. |
| Maximizes Combined Exemption: Allows married couple to potentially shield double the amount from federal estate tax (currently up to ~$25–28 million combined) by using both exclusions, even if first spouse left everything to second. | No Protection for Heirs: Assets left outright can be spent or redirected. Children from a prior marriage may be disinherited (intentionally or not), and there’s no guarantee your beneficiaries ultimately benefit from the first spouse’s assets. |
| Full Step-Up in Basis: Assets passing outright to the spouse get a step-up in tax basis at first death and again at second death, potentially reducing capital gains for heirs. A bypass trust only gets one step-up. | State Tax Exposure: No portability for state estate tax in most states – an outright approach could waste the first spouse’s state exemption, causing avoidable state death taxes when the second spouse dies. |
| Delayed Complexity: Surviving spouse can defer trust administration burdens until their own death, which is helpful if they need unrestricted access to funds during life. | Dependency on Executor/Spouse Actions: The first spouse’s DSUE requires the executor to file a return. If that executor is someone other than the surviving spouse (e.g., adult children), conflicts can arise. Without legal mandates, the election might be neglected. |
Portability vs. Trust Planning: In many second marriages, a hybrid approach is best – for example, use a trust for a portion of assets to secure children’s inheritance and use some portability for the rest to maximize tax savings. This way, you get the protection of a trust for certain assets (ensuring they ultimately go to your chosen beneficiaries) while still capturing any unused exemption via portability on the remainder. The right balance depends on the family situation, asset levels, and state tax considerations.
Remarriage & Portability in Action: Real-World Examples
To truly understand how remarriage affects estate tax portability, let’s walk through a few realistic scenarios. These examples illustrate what can happen with (and without) careful planning:
Example 1: Using DSUE vs. Losing It
Scenario: Alice’s husband, Jim, died in 2021 leaving her $3 million in assets and an unused federal exclusion of $8 million. Jim’s executor filed a Form 706 and elected portability, giving Alice a DSUE of $8M. Alice’s own exemption at that time is about $11.7M (2021). In 2022, Alice remarried Robert. What happens next?
- While Robert is alive: Alice’s last deceased spouse is still Jim. She effectively has a combined exemption of $11.7M (her own) + $8M (Jim’s DSUE) = $19.7M to cover gifts or her estate. She decides not to use any of Jim’s DSUE immediately, preferring to keep assets for her support.
- Tragedy strikes: In 2024, Robert unexpectedly passes away before Alice. Now Robert becomes Alice’s last deceased spouse. What happens to Jim’s $8M DSUE? Unfortunately, it’s gone. Alice can no longer use Jim’s exemption; instead, if Robert had any unused exemption, that would be available. Suppose Robert’s estate was modest and he used very little of his $12.92M exclusion – say $12M is unused. By electing portability on Robert’s estate, Alice could now get a new DSUE of $12M from Robert. On paper that sounds fine (she traded $8M for $12M). But note: if Robert’s estate (or executor) didn’t file for portability – perhaps because they assumed Alice already had plenty from Jim – Alice could end up with no DSUE at all. And crucially, because Alice hadn’t used Jim’s $8M when she had the chance, any benefit of that is lost to her family.
- If Alice had used Jim’s DSUE earlier: Imagine an alternate path – in 2023, sensing her net worth growing, Alice gifted $8M of investment assets to her children, explicitly using Jim’s DSUE. This gift was tax-free thanks to portability. When Robert died later, Jim’s DSUE would still vanish for future use, but Alice has no regrets – she successfully utilized that $8M while it was available. She can still elect to take Robert’s $12M DSUE for her remaining assets, effectively coming out ahead and having passed $8M to the kids tax-free. This highlights the benefit of timely use.
Key lesson: If you remarry, plan for the worst-case (new spouse dies first) when deciding whether to use DSUE now or hold it. Alice preserving Jim’s DSUE only worked out because Robert had an equal or larger unused exemption and presumably filed for portability. That won’t always be true, especially after 2025 if exemptions drop. Using the first spouse’s DSUE via gifts or other transfers can ensure it’s not wasted.
Example 2: Remarriage Without Portability Election (Missed Opportunity)
Scenario: Carlos and Diana are married, living in a state with no estate tax. Carlos dies in 2018 with a $4M estate – well below the federal exemption (~$11.18M in 2018). No estate tax return is filed since no tax was due and the family wasn’t aware of portability. Diana inherits everything outright. Fast forward to 2025: Diana, now with an estate of $6M (grown investments and Carlos’s assets), marries Edward. Edward has significant wealth of his own.
- Consequence of not filing for Carlos: Because no Form 706 was filed, Carlos’s unused exemption (approximately $7M unused) vanished. Diana has no DSUE from Carlos. When she married Edward, her last deceased spouse (for DSUE purposes) is still Carlos – but there’s nothing to use because they failed to elect it. Essentially, Diana is back to just her own exclusion (around $13M by 2025) and nothing extra.
- Edward’s death vs. Diana’s death: Suppose Edward, who is roughly Diana’s age, dies in 2027 when the federal basic exclusion has dropped to ~$7M. Edward’s estate is large, but with planning he uses $3M of his exclusion and ports the remaining $4M to Diana. Now Diana finally has a DSUE – but it’s only $4M (Edward’s), far less than the ~$7M she could have had from Carlos. If instead Diana dies first, her estate can only pass on her own unused amount (plus no DSUE from Carlos).
- Analysis: Had Diana filed for portability in 2018, she would have carried Carlos’s $7M DSUE through her remarriage. Even after 2026, she’d still have that $7M available (DSUE from a 2018 death doesn’t shrink). She potentially could have shielded much more upon her death or in lifetime gifts. By missing the filing, that opportunity was irretrievably lost – an estate tax (at 40%) on $7M is $2.8M, which is the potential cost of that oversight if her assets or subsequent gifts eventually exceeded her solo exemption.
Key lesson: Always elect portability for a deceased spouse if there’s any chance the survivor’s estate plus new spouse’s assets could someday exceed one exemption. Circumstances change – in Diana’s case, a later marriage to a wealthy spouse and a law change reducing exemptions made Carlos’s unused $7M very relevant. With the IRS’s current 5-year extension for late elections (for deaths after 2010), one should even revisit recent past deaths to see if a late portability election is still possible.
Example 3: Blended Family and Portability Misstep
Scenario: Frank is a widower with two grown children; he marries Grace, a widow with one son. This is a classic blended family. Frank has $10M estate, Grace $3M. Frank wants to take care of Grace but ultimately leave his remaining wealth to his kids. He’s aware of portability and that his $10M is under the $12.92M federal exemption, so he decides to leave everything outright to Grace in his will, thinking: she won’t owe tax (marital deduction applies), and she can port my unused exclusion – no estate tax, and she’ll share whatever’s left with my kids later. Frank dies in 2023.
- Portability and outcome: Grace, as the executor, elects portability on Frank’s estate. Frank used none of his $12.92M exclusion (everything went to spouse tax-free), so Grace receives Frank’s full unused exclusion as DSUE (~$12.92M). Grace now has an enormous exemption (her own ~$12.92M + Frank’s ~$12.92M = ~$25.84M). No taxes at Frank’s death – good so far. But now Grace controls all $10M of Frank’s assets outright. She commingles some assets and over the next few years, she gifts $1M to her son and spends another $2M on helping him buy a home and on joint lifestyle. These gifts incur no gift tax – Grace uses a portion of Frank’s DSUE to cover them.
- When Grace dies: Fast forward 10 years. Grace dies (without having remarried) with $8M of Frank’s assets remaining plus $2M of her own – total estate $10M. Her estate is under the available exclusion (even if the exemption dropped, she had so much DSUE it likely covers $10M). She leaves her estate equally to her son and Frank’s two kids, as she believes Frank wanted. However, because the assets weren’t earmarked, what’s left is $10M to split three ways (so Frank’s kids get roughly $3.33M each). Had Frank’s $10M been kept separate, his kids might have gotten closer to $5M each (if none spent on Grace’s side). Moreover, if Grace’s estate did exceed her exclusions for some reason, Frank’s kids might have indirectly paid estate tax on assets originally from their dad (since his DSUE was partly diverted to benefit Grace’s son).
- Alternate planning: If Frank had instead put, say, $5M in a trust for the benefit of Grace (income for life, remainder to his kids) and left $5M outright to Grace, the trust $5M would use part of Frank’s exemption at his death (no tax, no DSUE needed on that portion). Grace could still port whatever unused exclusion remains. Crucially, that $5M in trust would be protected for Frank’s children – Grace couldn’t spend it or redirect it (beyond any rights given in the trust), and it wouldn’t be part of Grace’s estate at all. Only the $5M outright would be subject to her control and potentially her DSUE usage. This approach balances providing for Grace and preserving a chunk for his kids. Yes, it’s more complex and Grace ends up with a smaller DSUE (since Frank’s exemption was partly used by the trust), but for many families, control and intent outweigh maximizing tax transfers.
Key lesson: In second marriages with separate children, portability alone can be a double-edged sword. It achieves tax efficiency, but at the cost of giving the surviving spouse complete control. That spouse could unintentionally or intentionally favor one side of the family. A well-thought estate plan often mixes trust planning with portability to align with inheritance goals while still saving taxes.
Example 4: Non-Citizen Spouse and QDOT
Scenario: Liam, a U.S. citizen with a $15M estate, dies in 2025 and is survived by his wife Sofia, who is a resident alien (green card holder) but not yet a U.S. citizen. Because Sofia isn’t a citizen, Liam’s estate can’t just use the unlimited marital deduction by giving assets outright to her – estate tax would apply to amounts over Liam’s exclusion unless mitigated. The solution is to transfer $10M of Liam’s assets into a Qualified Domestic Trust (QDOT) for Sofia’s benefit and use Liam’s own $5M exemption on the rest given to their kids. The QDOT defers estate tax on that $10M until distributions or Sofia’s death. Liam’s executor elects portability for Liam’s unused exemption. At first glance, Liam used his full $12.92M exemption: $5M direct to kids + $7.92M of the $10M QDOT qualifies for marital deduction? Actually, the QDOT portion doesn’t consume the exemption because it’s deductible, so Liam’s DSUE is roughly $7.92M (the unused part of his $12.92M, since only $5M went to non-marital transfers). Sofia obtains this DSUE, but with a catch: it’s “preliminary” until the QDOT is taxed. If Sofia becomes a U.S. citizen within a certain timeframe and certain conditions are met, the QDOT can be treated as if it were a normal marital transfer (and the DSUE can be finalized then). If not, the DSUE remains in limbo.
- Sofia remarries before citizenship: Suppose Sofia remarries a year later to Peter (a U.S. citizen). Does Liam’s DSUE vanish now? No – remarriage doesn’t affect Liam being her last deceased spouse, and Sofia does still technically have Liam’s DSUE. But because of the QDOT, she can’t use it for gifts yet – the IRS rules say DSUE from a QDOT-funded estate isn’t available for lifetime use until it’s finalized (usually at the surviving spouse’s death or upon citizenship). If Sofia never becomes a citizen and later dies, the $10M QDOT is taxed and whatever of Liam’s exemption is unused at that point would effectively factor into the final tax and any DSUE to port to Peter. If Peter dies before Sofia in the meantime, then Peter becomes last deceased spouse and Liam’s DSUE would be lost for good (not that Sofia could use it while the QDOT was active, but it could have reduced estate tax at her death if she remained single).
- This complicated scenario highlights that international elements require extra care. If Sofia intended to naturalize as a U.S. citizen, doing so before any potential change in last deceased spouse status would secure Liam’s DSUE for her use. Non-citizen spouses should be counseled on timing – both for citizenship and for QDOT distributions – in relation to remarriage and portability.
These examples underscore the moving parts when portability and remarriage intersect. Every situation will differ, but the core principles shine through: timely elections, strategic use of DSUE when needed, and alignment of estate planning techniques with family objectives are key to success.
What the Law Says: IRS Rules & Court Cases on Portability After Remarriage
Portability and remarriage aren’t just planning concepts – they’re grounded in specific laws, regulations, and even court decisions. Here’s a quick tour of the legal backbone behind these rules and some notable interpretations:
Federal Tax Law & Regulations: The foundation of portability is in the Internal Revenue Code, primarily IRC §2010(c). This section defines the “applicable exclusion amount” which includes the basic exclusion plus any DSUE from a predeceased spouse. In 2010, Congress introduced portability in a temporary tax relief act, and it was made permanent in 2013 with the American Taxpayer Relief Act. A key provision is §2010(c)(5), which requires an estate tax return filing to elect portability and also contains the rule allowing the IRS to examine the first spouse’s return later to adjust DSUE. The IRS Treasury Regulations (26 C.F.R. §20.2010-1 et seq.) flesh out how portability works. Notably, Reg. §20.2010-1(e) clarifies the last deceased spouse rule and confirms that a surviving spouse may use the DSUE of their last deceased spouse for gifts and that remarriage itself does not change who is considered the last deceased spouse. These regs also say you can’t double-dip on multiple DSUEs at once.
IRS Guidance: Over the years, the IRS has released procedures to simplify portability. Rev. Proc. 2017-34 initially allowed a modest extension for late filing of the portability election (a 2-year window for estates under the filing threshold). Rev. Proc. 2022-32 expanded that relief to 5 years after death – a significant acknowledgement by the IRS that many were missing the deadline. This is why, if your spouse died within the last five years and no estate return was filed, you might still make a late portability election without a private letter ruling. The IRS’s own FAQ and Form 706 instructions underscore: an estate tax return must be filed to elect portability, even if no tax is due, and remarriage doesn’t nullify a DSUE you’ve secured.
Court Cases:
- Estate of Sower v. Commissioner (149 T.C. No. 11): This 2017 U.S. Tax Court case was the first big judicial interpretation of portability provisions. The surviving spouse (Minnie Sower) had claimed DSUE from her late husband. The IRS audited the late husband’s earlier return after the normal statute of limitations, finding he had unreported lifetime gifts which meant his DSUE was overstated. Minnie’s estate argued the IRS shouldn’t adjust it since the husband’s return was closed. The Tax Court sided with the IRS, pointing to the law (IRC 2010(c)(5)(B)) that explicitly allows the IRS to examine a deceased spouse’s return at any time (notwithstanding statutes of limitation) to determine DSUE accuracy for the survivor. Importantly, the court held this didn’t violate due process – the IRS couldn’t assess tax on the first estate after statute, but it could reduce the DSUE for the second estate. Takeaway: If you’re a surviving spouse using DSUE, know that the IRS can later scrutinize your late spouse’s finances to ensure that DSUE number was correct. Remarriage doesn’t change that, but practically if you’ve had multiple spouses, the IRS would look at whichever spouse’s DSUE you’re using at death.
- Estate of Vose (Oklahoma Supreme Court, 2017): This state court case, while not about remarriage per se, dealt with a second-marriage scenario and executor’s duty to elect portability. In Vose, a surviving husband from a second marriage was initially executor of his late wife’s estate, but the wife’s son (from a prior marriage) took over as administrator. The son didn’t want to incur the cost of filing an estate tax return since the estate was under the exemption, thus he wouldn’t elect portability for the husband’s benefit. The husband sued, and the Oklahoma Supreme Court ruled that the administrator had a fiduciary duty to file the return and preserve the DSUE for the surviving spouse when it doesn’t harm the estate. This case shows that courts may compel an executor to make the portability election, especially in blended family contexts. It’s a cautionary tale: if you’re the surviving spouse and someone else controls your late spouse’s estate, you might have to fight for that election – better to plan ahead with agreements or by naming a friendly executor.
- Private Letter Rulings (various): The IRS has issued numerous PLRs granting late election relief or clarifying issues. For example, some PLRs have addressed situations of multiple remarriages and DSUE usage, or errors in reporting DSUE on returns. While PLRs aren’t precedent for everyone, they indicate the IRS’s thinking. A theme is that the IRS is fairly lenient in granting relief for late filing when the estate was under the limit (hence the Rev. Proc. 2022-32). There have also been PLRs confirming that if a surviving spouse used DSUE then lost it by remarriage, the amount used is not clawed back – confirming that “what’s used is used.”
- State Law Nuances: A few states, like Hawaii, have had cases or statutes on state portability. Hawaii explicitly allows a port of unused state exemption (with its own forms and deadlines). Maryland does as well. But no major litigation has tested those deeply, since state estate tax portability is relatively new. In other states, the absence of portability has led to the continued use of credit shelter trusts. While not a court case, it’s worth noting: in a state like Massachusetts, there have been instances where surviving spouses petition the probate court for modifications to trust plans post-portability era – e.g., trying to terminate an old credit shelter trust to take advantage of portability. Results vary, but it’s a reminder that what might be optimal federally (portability) could conflict with state tax planning locked in via trusts.
In summary, the legal landscape affirms that portability is effective but must be elected, and that remarriage doesn’t upset the apple cart until a new death occurs. The IRS has provided avenues to make elections easier and has guarded against abuses (like auditing DSUE origins). Courts have stepped in to protect surviving spouses’ rights to DSUE in contentious family situations. All these pieces – Code, regs, IRS guidance, and case law – contribute to a clearer picture: to benefit from portability, follow the formalities (file that return!), be mindful of the last deceased spouse rule, and document intentions in legal agreements when family circumstances warrant.
Understanding DSUE in Different Remarriage Scenarios (Key Terms Explained)
To navigate portability after remarriage, it helps to grasp some key estate tax terms and concepts. Let’s break down the jargon and compare how things play out across different scenarios:
Basic Exclusion Amount (BEA): This is the base amount each individual can transfer free of federal estate/gift tax. It’s sometimes called the “estate tax exemption.” As of mid-2020s, it’s very high (around $13 million and indexed annually). It is scheduled to drop in 2026. The BEA is what each person gets on their own, without regard to marriage.
Deceased Spousal Unused Exclusion (DSUE): The portion of the BEA that a deceased spouse did not use and that can be transferred to the surviving spouse by electing portability. For example, if someone died when the BEA was $12M and their taxable estate was $3M (after deductions), their unused $9M could become DSUE for the spouse. The DSUE is fixed based on the law at the time of that spouse’s death (it doesn’t increase with inflation afterward). It effectively “tops up” the surviving spouse’s own exemption. The surviving spouse can use DSUE for lifetime gifts and at death. But remember, DSUE can be replaced by a new spouse’s DSUE if the survivor outlives another spouse.
Last Deceased Spouse: This term is crucial. It refers to the most recent spouse of yours who has died at any given time. Portability regulations use this concept to determine whose DSUE you can use. If you’ve only been widowed once, that person is your last deceased spouse until maybe you remarry and enviably face another spouse’s death. If you’ve had multiple spouses pass away, it’s always the latest one. Importantly, it’s determined at the time you make a gift or at your death. For instance, say you were widowed by Spouse A, then remarried Spouse B. If you are making a gift while B is alive, A is your last deceased (so you use A’s DSUE). If B then dies, from that point on B is last deceased (so A’s DSUE is no longer available for future transfers). The last deceased spouse rule prevents accumulating multiple DSUEs; it ensures only one spouse’s unused exemption is in play.
Marital Deduction vs. Portability: The marital deduction is the unlimited deduction that allows assets to pass to a surviving spouse free of estate tax. However, if the surviving spouse is not a U.S. citizen, this only works via a QDOT trust as discussed. Portability and the marital deduction often work together: typically the first spouse leaves everything to the survivor (100% marital deduction, so no tax) and then elects portability to carry over the unused exemption (since using the marital deduction means you didn’t need to use your exemption). In contrast, if the first spouse leaves assets to others (kids, trust, etc.), that portion uses up their exemption but reduces what could be ported. Balancing marital deduction use vs. using the exemption at first death is a key planning decision, especially in second marriages (marital deduction gives surviving spouse control; using exemption via a trust can lock in benefit for kids).
Credit Shelter Trust (Bypass Trust): This is a trust funded at the first spouse’s death (typically up to the amount of that spouse’s exemption) that is designed not to be included in the surviving spouse’s estate. It “shelters” those assets from any future estate tax. Before portability, this was the standard way to use the first spouse’s exemption. In a second marriage, a credit shelter trust can ensure the first spouse’s assets eventually go to certain beneficiaries (e.g., children from first marriage), while still benefiting the survivor during their life (income or limited principal). The downside is the assets in the trust won’t get a second basis step-up at the second death, and if the first spouse’s exemption exceeds the trust funding, any excess exemption died with them (unless portability is also used). Some modern plans combine a credit shelter trust for part of the estate and portability for the rest, hedging bets.
Qualified Terminable Interest Property (QTIP) Trust: A QTIP is a special marital trust often used in second marriages. It gives the surviving spouse all income for life (and optionally principal under certain terms), but allows the first spouse to control the remainder at the surviving spouse’s death. Qualifying it for a marital deduction means no estate tax at the first death (like an outright transfer). One can then still elect portability on any unused exclusion. However, the QTIP assets will be included in the surviving spouse’s estate when they die (that’s the trade-off for marital deduction). QTIPs are a way to take care of the second spouse and still ensure, say, the principal goes to the first spouse’s children later. A nuance: The IRS allows a QTIP+Portability combo where even if you could have put assets in a bypass trust, you intentionally QTIP them (treat as marital) and elect portability. This may preserve flexibility (survivor has full exemption and DSUE) but can cause the scenario described earlier where the exclusion benefits get skewed.
Resident Alien vs. Nonresident: A resident alien (for estate/gift tax, essentially someone domiciled in the U.S. or a long-term green card holder) is treated similarly to a U.S. citizen – they get the full exemption and can participate in portability (if the decedent or surviving spouse is a resident). A nonresident non-citizen (not domiciled in the US) has a very limited exemption ($60,000) and no portability. This primarily matters if, say, one spouse wasn’t a U.S. person. If a U.S. citizen dies married to a non-citizen non-resident and tries to elect portability, it’s not allowed – the law prohibits it in that scenario. However, in most cases of remarriage in the U.S., at least the surviving spouse is domiciled in the States.
Now, let’s compare three common remarriage portability scenarios side by side, to see how these terms and rules manifest:
| Scenario | Portability Outcome & Explanation |
|---|---|
| 1. Surviving Spouse Remarries and Uses DSUE Early (before any potential loss) e.g., Widow inherits $5M DSUE, makes $5M gift to kids using it, then remarries. | DSUE benefit locked in. By using her late husband’s $5M DSUE for gifting, the widow secures those transfers tax-free. If her new spouse later dies first, she loses any remaining DSUE from husband #1 – but she already utilized it. She can still inherit DSUE from the new spouse going forward. Key point: Using DSUE while available ensures it isn’t wasted, effectively preserving the first spouse’s exemption within the family. |
| 2. Surviving Spouse Remarries and Does Not Use DSUE (carries it but new spouse dies first) e.g., Widower carries $5M DSUE from first wife into second marriage, but second wife dies before he uses it. | First spouse’s DSUE lost; potentially replaced. At remarriage, he kept the $5M DSUE as long as his second wife was alive. But when she passed away, the widower’s “last deceased spouse” became wife #2. He can no longer use wife #1’s $5M. Instead, if wife #2 had any unused exemption and her estate elects portability, he gains that. If she had, say, $3M unused, he now has $3M DSUE (less than before). If no portability election was made for wife #2, he’s left with zero DSUE. Key point: Not using the first spouse’s DSUE when you had it is risky – it can vanish if the survivor is predeceased by the new spouse. |
| 3. First Spouse’s Estate Never Filed for Portability (DSUE not preserved) e.g., Husband dies with unused exemption but no 706 filed; Wife remarries, later faces estate tax. | No DSUE available from first spouse. Because portability wasn’t elected, the wife had no extra exemption entering her second marriage. She only had her own BEA. Upon the next death (hers or new spouse’s), there’s nothing from the first marriage to use. She could only potentially get DSUE from the second spouse. Key point: Failing to capture DSUE initially is a permanent lost opportunity – remarriage or not, you can’t recover it (unless within IRS’s late filing window). This scenario is sadly common when people underestimate their future estate growth or the impact of changing tax laws. |
As these scenarios show, the outcome of portability in remarriage hinges on actions taken at critical junctures – filing that first return, using available DSUE proactively, and handling subsequent estates properly. It’s a chain where a break at any link (like Scenario 3’s missed filing) or a change in course (Scenario 2’s unexpected death order) can alter the tax picture significantly.
Portability’s Key Players: IRS Rules, State Laws, Executors & Family Dynamics
Portability after remarriage doesn’t happen in a vacuum – it involves a cast of people, organizations, and laws all interacting. Let’s map out who the key players are and how their roles influence the outcome:
The Surviving Spouse: At the center of it all is the surviving spouse (widow or widower) who remarries. Their decisions (or sometimes, inaction) are crucial – from ensuring an estate tax return is filed to making use of DSUE through gifts or estate planning. The surviving spouse often works with estate planners to decide whether to rely on portability or set up trusts. Their relationships (with new spouse, with children, stepchildren, etc.) also heavily influence planning choices. For instance, a surviving spouse who promises to “take care of” the children from the first marriage must decide whether to formalize that via trusts or just good intentions; portability gives them freedom, but also responsibility to follow through. If the surviving spouse is also the executor of the deceased spouse’s estate (common when the marriage is straightforward), they have the power to elect portability or not. If they’re not the executor (say, adult children are, or a personal representative appointed by court), they have to depend on that executor’s actions or possibly petition the court if needed (like in Vose).
The New Spouse: The person whom the surviving spouse remarries becomes another critical factor. While they are alive, they don’t directly affect the first spouse’s DSUE (as we learned, remarriage alone doesn’t cancel it). However, the new spouse’s death or life choices do matter:
- If the new spouse dies first, they (or rather, their estate) now can pass a DSUE to the surviving spouse. The new spouse’s executor might be someone else who needs to make that election. The new spouse might also have their own estate plan that, for example, leaves everything to the surviving spouse or not. If the new spouse’s estate doesn’t file for portability, the surviving spouse could lose out.
- If the surviving spouse dies first, the new spouse ends up the heir/beneficiary. In that case, the new spouse’s interest may conflict with the first spouse’s family. For example, the new spouse might prefer no trusts (so they get everything outright) whereas the children of the first marriage would prefer a trust to ensure they get something later.
- The new spouse’s citizenship is relevant if the surviving spouse isn’t a citizen (the new spouse could be subject to QDOT rules if roles reversed).
In essence, the new spouse is both a partner and, in a way, a successor who might indirectly benefit from or nullify the first spouse’s DSUE. This is why open communication and maybe prenuptial agreements come into play in second marriages – so that both partners know how things will be handled regarding any past DSUE and future estate plans.
The Executor(s): Executors (or personal representatives) of each estate hold the keys to portability:
- The executor of the first spouse’s estate must file the estate tax return with the portability election. This could be the surviving spouse or someone else (like a child from that spouse’s prior marriage, a bank trustee, etc.). If it’s someone else, the surviving spouse often needs their cooperation. Under law, that executor has the sole authority to elect or not elect portability. As we saw, courts may intervene if an executor capriciously refuses and it harms the spouse, but ideally one plans ahead to avoid a hostile executor scenario.
- The executor of the second spouse’s estate (if the second spouse dies first) similarly must file for portability to give the survivor a new DSUE. If the second spouse’s family is different, they might not care about helping the survivor carry on an exemption. For instance, imagine a widowed woman marries a widower, and the widower has kids from prior marriage who stand to inherit his estate. If he dies, those kids (if executors) might not bother filing a 706 for dad since his estate owed no tax – but by not filing, they accidentally deprive the stepmother (the surviving second wife) of DSUE she could have gotten. Encouraging communication or agreements on this front is important.
- If the surviving spouse dies (before or after the new spouse), the executor of the surviving spouse’s estate will be electing portability for whichever spouse outlives them (if any). This could be the new spouse receiving DSUE. Again, if the executor is perhaps the children from the first marriage, they might be hesitant to extend any benefit to the step-parent (new spouse). However, they may also realize it costs them nothing to do so if the estate is under the limit. But human dynamics can interfere.
IRS (Internal Revenue Service): The IRS is the referee enforcing the rules. They:
- Issue regulations and forms (Form 706 instructions clearly layout the steps for portability).
- Accept or reject portability elections. (If a filing is late and outside relief, the IRS can deny the portability benefit – meaning DSUE wouldn’t exist for the survivor.)
- Audit returns: As in the Sower case, the IRS can review the first spouse’s return to verify the DSUE. The IRS also monitors that the DSUE amount is correctly reported. If multiple spouses have died, the IRS will check that the DSUE used corresponds to the correct last deceased spouse.
- Provide guidance: through Rev. Procs and FAQs, the IRS tries to make it easier to comply. But they also expect proper documentation. If an estate is messy or assets are undervalued (perhaps to maximize DSUE erroneously), the IRS could challenge that.
In remarriage contexts, the IRS doesn’t treat you differently except for the last spouse rule. But one noteworthy IRS stance: if property passes to a QDOT for a non-citizen spouse, the DSUE isn’t usable until it’s fixed. The IRS in regs ensures that a surviving non-citizen spouse can’t prematurely use DSUE that might be needed to cover tax on QDOT assets later. They also require that if the non-citizen spouse becomes a citizen, only then does the DSUE become “active” for gifts.
State Tax Authorities and Laws: On the state side, each state with an estate or inheritance tax may have its own approach:
- Most states (e.g., New York, Massachusetts, Oregon, etc.) do not allow portability of their estate tax exemption. So if a couple lives in one of those states, the state tax authority won’t give the surviving spouse any credit for the first spouse’s unused state exemption unless planning (like a state-only bypass trust) was done. This interplay is significant. For example, a couple in a state with a $1 million exemption each would owe state estate tax if one spouse dies with $2 million all going outright to the other (because at second death, there’s effectively $2M in one person’s estate and only $1M exempt). Planners in those states must often use trusts at first death specifically to use that $1M state exemption (even if federally they elect portability).
- Hawaii and Maryland are exceptions that explicitly allow state portability. If you’re in those states and follow their rules (which usually mirror the federal requirement of filing a state estate tax return on time), you can carry over the state exemption. For instance, Maryland currently has around a $5 million exemption – with portability, a married couple could shield up to $10M from Maryland estate tax, similar to the federal concept.
- The state tax authorities generally don’t involve themselves with DSUE from a federal perspective, but indirectly, a larger federal DSUE might encourage a larger estate that triggers state tax. In planning, one must remember that even if no federal tax because of DSUE, there could be a state tax bill if the state exemption was exceeded (because state exemption likely wasn’t doubled via portability). This often surprises families – “We had $8M and thought we were under the ~$12M federal limit, but forgot our state only exempts $4M with no porting – now at second death there’s a state tax due.” Knowledge of your state’s stance is thus key.
Congress and Lawmakers: Though not directly involved in individual cases, it’s worth noting that portability and estate tax laws are shaped by legislation. Congress sets the exemption amount (and its future), decides if portability stays (it’s now a permanent feature but could be changed in future reforms), and could even modify the rules (for example, some proposals have considered clawing back gifts if exemption drops, though currently DSUE from a deceased spouse is protected even if laws change). State legislatures also determine state estate tax rules; some states have raised or eliminated their estate taxes in recent years. For example, New Jersey repealed its estate tax in 2018 (it used to not allow portability and had a $675K exemption – now moot). Illinois considered raising its exemption to $8M (still no portability). Staying tuned to law changes matters: if the federal exemption plunges in 2026, Congress could also consider whether portability still makes sense at lower levels or if any new conditions apply. So far, no indication it will be removed, but wealthy couples in second marriages should keep an eye on tax reform discussions.
Estate Planners and Attorneys: They may not be “players” in the tax sense, but the professionals guiding you are crucial. They know the relationships above and must coordinate them – e.g., get executors on board, ensure IRS filings, navigate state law. An experienced estate attorney will, for instance, include provisions in wills/trusts about portability: directing executors to file the return (and who pays for it), possibly giving executors discretion or requiring QTIP vs. credit shelter funding given tax law at the time, and including “portability clauses” in prenuptial agreements as mentioned. They will also advise on the human side: perhaps encouraging a meeting between the surviving spouse and the deceased spouse’s children to agree that filing the return is in everyone’s best interest (it usually doesn’t hurt the kids, since it doesn’t impose tax, it only helps the spouse).
Family Members and Beneficiaries: Finally, the broader family plays a role. Children from a prior marriage, for example, might be beneficiaries of a bypass trust or the eventual inheritors at the second death. Their cooperation or conflict can shape how smoothly portability is implemented. If they’re suspicious of a step-parent, they might oppose actions (like QTIP elections or portability filings) that they think could disadvantage them. Conversely, a well-informed family can work as a team: step-siblings might ensure that whichever parent dies first, the survivor gets the DSUE, because they realize that could save taxes that ultimately preserve more assets for all heirs. Essentially, estate tax planning in remarriage is also family diplomacy.
In summary, portability after remarriage sits at the intersection of tax law and human dynamics. The IRS and state laws set the rules of the game. Executors and attorneys execute the moves. The surviving spouse and new spouse are the main players whose lives and deaths determine how those rules apply. And the extended family often provides the context in which decisions are made – whether harmoniously or adversarially. For a successful outcome, all these players need to be considered. Ensuring everyone knows their part – filing required paperwork, agreeing on estate distributions, understanding the limitations (like state taxes, non-citizen issues) – will lead to the best use of portability benefits and the least strife in a second marriage situation.
FAQs: Remarriage & Estate Tax Portability
Q: If I remarry, do I lose the DSUE from my first spouse?
A: No – simply remarrying does not erase your first spouse’s DSUE. You keep it until you have another deceased spouse. If your new spouse dies before you, then the first spouse’s DSUE is replaced by the new spouse’s unused exemption.
Q: Can I use DSUE from two late spouses at the same time?
A: No. You only ever have one “last deceased spouse.” You can use multiple spouses’ DSUE in sequence (one after another if each predeceases you), but you cannot combine two spouses’ exemptions concurrently.
Q: What if we never filed an estate tax return when my first spouse died?
A: Unfortunately, without filing Form 706 to elect portability, your late spouse’s unused exemption is lost. If the death was recent (within 5 years) and the estate was under the filing threshold, you may still file now under IRS late election relief to preserve the DSUE.
Q: Do any states allow portability of their estate tax exemption?
A: Almost all states with their own estate or inheritance taxes do not offer portability – each spouse’s state exemption is “use it or lose it.” The notable exceptions are Hawaii and Maryland, which allow a state portability election. Always plan separately for state estate taxes, since a federal DSUE won’t help with state-level taxes in most places.
Q: Does a non-U.S. citizen surviving spouse get portability?
A: Yes, but with conditions. If the surviving spouse isn’t a U.S. citizen, the first spouse’s assets typically must go into a QDOT trust to qualify for the marital deduction. A portability election can be made, but the DSUE isn’t fully available until the trust is taxed or the surviving spouse becomes a U.S. citizen. Also, a non-resident decedent’s estate cannot elect portability at all.
Q: Will the estate tax exemption drop in 2026 affect my existing DSUE?
A: A DSUE amount that’s been earned from a deceased spouse is locked in as a dollar amount – it won’t decrease if the law later lowers the exemption. For example, if you received a $10M DSUE from a spouse who died in 2025, you keep that $10M even if your own basic exemption falls to $6M in 2026 (giving you a combined $16M). However, a new spouse dying after 2025 will only have the lower exemption to potentially port. So, planning is needed if you anticipate the law change – use existing DSUE wisely, and don’t assume future DSUE will be as high.
Q: What happens to portability if I divorce my second spouse (not widowed)?
A: Portability only comes into play when a spouse dies. If you divorce, no one’s died in that marriage for DSUE purposes, so your last deceased spouse remains whoever it was before (perhaps your first spouse if you were widowed). You don’t gain or lose any DSUE by divorcing; you simply have no “last deceased spouse” from that union. If you later remarry yet again, the rules will apply with that new marriage going forward.
Q: How can I ensure my late spouse’s executor files for portability?
A: Communication and legal planning are key. Ideally, your spouse’s will should name an executor who is likely to cooperate (often it’s you). If it’s someone else, discuss the importance of the portability election early. You can offer to pay expenses for preparing the return since it benefits you. In some cases, court action is possible to compel an executor (as seen in Estate of Vose), but it’s better to prevent that need with a clause in estate documents or a prenuptial agreement obligating the election.