IRS Grants Extension for Portability Election Under § 2010(c)(5)(A)

IRS Allows Late Portability Election for Estate: What Taxpayers Need to Know

The IRS has granted a 120-day extension under § 301.9100-3 for a surviving spouse to make a late portability election under § 2010(c)(5)(A), allowing the estate to transfer the deceased spouse’s unused exclusion (DSUE) amount. This non-precedential ruling provides critical relief for estates that missed the original filing deadline, enabling the surviving spouse to claim the DSUE and reduce future estate tax liability. The decision underscores the IRS’s willingness to grant discretionary extensions when taxpayers demonstrate reasonable cause, offering a lifeline for executors who overlooked the strict filing requirements.

The Estate’s Mistake: Why the Portability Election Was Missed

The decedent died on [specific date redacted in source], survived by their spouse. At the time of death, the estate’s gross estate—including all assets and taxable gifts—fell below the filing threshold under § 6018(a), which requires estates to file Form 706 (U.S. Estate (and Generation-Skipping Transfer) Tax Return) only if the gross estate exceeds the applicable exclusion amount (then $13.61 million in 2024, adjusted for inflation). Based on this valuation, the estate’s executor determined no estate tax return was due and thus no filing was necessary.

However, the executor later discovered that a portability election was required to transfer the deceased spousal unused exclusion (DSUE) amount to the surviving spouse. Portability, authorized under § 2010(c)(5)(A), allows the surviving spouse to inherit the portion of the deceased spouse’s estate tax exemption that went unused. Without this election, the DSUE amount would be lost permanently, increasing the surviving spouse’s potential estate tax liability. The election is made by filing a complete and properly prepared Form 706 within the statutory deadline.

Despite the need for portability, the estate failed to file Form 706 in a timely manner. The executor did not realize the election was required until after the original filing deadline had passed, leading to the missed opportunity to preserve the DSUE amount. The estate subsequently sought an extension under § 301.9100-3 to file the portability election retroactively.

IRS Rationale: Why the Extension Was Granted

The IRS granted the estate’s request for an extension under § 301.9100-3, which authorizes discretionary relief for late regulatory elections when the taxpayer demonstrates reasonable cause, good faith, and no prejudice to the government. This provision applies specifically to elections whose due dates are set by regulation—not statute—such as the portability election under § 20.2010-2(a)(1), which requires the filing of a Form 706 within nine months of the decedent’s death (or the last day of an extension period).

The IRS’s analysis hinged on the estate’s ability to satisfy the three-pronged standard set forth in § 301.9100-3: (1) the estate’s failure to timely file was due to reasonable action and good faith; (2) the estate acted with due diligence in seeking relief; and (3) granting the extension would not prejudice the government’s interests. The estate submitted affidavits and representations detailing the executor’s misunderstanding of the portability requirement and the subsequent discovery of the missed election. Based on this evidence, the IRS concluded that the estate had met these standards.

Crucially, the IRS emphasized its discretionary authority under § 301.9100-1(c), which permits the Commissioner to grant extensions for regulatory elections under §§ 301.9100-2 and 301.9100-3, provided the taxpayer demonstrates compliance with the statutory and regulatory prerequisites. The IRS noted that the estate’s situation did not involve a statutory election deadline but rather a regulatory filing requirement, making § 301.9100-3 the applicable framework for relief.

In granting the extension, the IRS issued a 120-day grace period from the date of the letter (May 4, 2026), allowing the estate to file a complete and properly prepared Form 706 to elect portability. The IRS explicitly tied the duration of the extension to its discretionary authority, ensuring that the relief was narrowly tailored to the estate’s circumstances while maintaining the integrity of the regulatory framework governing portability elections.

How to Comply: Filing Requirements for the Portability Election

The IRS granted the estate a 120-day grace period from May 4, 2026, to file a complete and properly prepared Form 706 to elect portability under IRC § 2010(c)(5)(A). To comply, the estate must file the return with the Kansas City IRS Service Center within this window. The filing address is the Department of the Treasury, Internal Revenue Service Center, Kansas City, MO 64999, as specified in the PLR.

The estate must include a copy of the PLR (PLR-119548-25) with the Form 706 submission. This ensures the IRS recognizes the election as timely under the discretionary relief granted. The PLR explicitly states that a Form 706 filed within 120 days from the letter’s date will be considered timely for portability purposes.

A critical caveat applies: if the estate is later determined to be required to file an estate tax return under § 6018(a), the IRS’s extension becomes null and void. Section 6018(a) requires an estate tax return when the gross estate exceeds the applicable exclusion amount or includes certain taxable gifts. The PLR warns that the Commissioner lacks authority under § 301.9100-3 to grant an extension in such cases, rendering the relief ineffective. The IRS reiterates this limitation by citing § 20.2010-2(a)(1), which ties the validity of the portability election to the timely filing of Form 706.

For taxpayers in similar situations, this ruling underscores the importance of proactively verifying filing requirements before relying on discretionary relief. Even if an estate initially appears below the filing threshold, subsequent valuations or adjustments may trigger a § 6018(a) requirement, disqualifying the extension. Executors should therefore conduct a preliminary assessment of the gross estate and taxable gifts early in the administration process to avoid unintended disqualification of portability relief.

Implications for Other Estates: What This Ruling Means for Taxpayers

The IRS’s grant of a late portability election in this ruling underscores a critical lesson for all estates: timely filing is not merely procedural—it is the difference between preserving a $13.61 million exemption (in 2024 terms) and forfeiting it permanently. Section 20.2010-2(a)(1) explicitly requires the portability election to be made on a timely filed Form 706, and the IRS’s denial of relief in this case—where the extension was deemed "null and void"—serves as a stark reminder that even estates below the filing threshold cannot rely on discretionary relief if they fail to act within the statutory framework. The estate in question lost the opportunity to transfer the deceased spouse’s unused exclusion (DSUE) amount solely because it missed the deadline, a loss that could translate to millions in avoidable estate tax liability for the surviving spouse.

For estates that miss the portability election deadline, the IRS’s discretionary relief under § 301.9100-3 remains a lifeline, but it is not a guarantee. The IRS will grant extensions only if the estate demonstrates reasonable action and good faith, as outlined in Revenue Procedure 2022-32. However, the ruling’s emphasis on the non-precedential nature of private letter rulings (PLRs)—as stated in § 6110(k)(3)—means that estates seeking relief must substantiate their DSUE amount upon audit with concrete evidence. The IRS’s warning that "any claimed DSUE amount will be included in the applicable exclusion amount of Spouse only to the extent that Spouse can substantiate such amount" places the burden squarely on the taxpayer to provide detailed valuations, appraisals, and supporting documentation to avoid disputes during examination.

Practitioners must counsel their clients that proactive vigilance is the best defense against losing portability. Even estates initially below the Form 706 filing threshold—such as those with gross estates under $13.61 million—may later exceed the threshold due to appreciation in assets, post-mortem valuations, or adjustments to taxable gifts, thereby disqualifying them from the simplified late-election relief under Rev. Proc. 2022-32. The IRS’s strict interpretation of § 20.2010-2(a)(1) means that once an estate becomes subject to § 6018(a) filing requirements, the portability election must be made on a timely filed return or risk forfeiture of the DSUE amount. Executors should therefore conduct preliminary assessments of the gross estate and taxable gifts early in the administration process, as even minor missteps—such as overlooking a late-discovered asset—can trigger filing obligations and eliminate eligibility for discretionary relief.

The broader implications for taxpayers are clear: portability is not a default benefit but a conditional election that demands meticulous compliance. Estates that act swiftly to file Form 706—whether within the 9-month deadline or, if necessary, under Rev. Proc. 2022-32’s 5-year window—can secure their DSUE amount and shield the surviving spouse from unnecessary tax exposure. Those that delay or assume relief will be granted risk permanent loss of the exemption, with no recourse beyond the IRS’s limited discretion. For high-net-worth families, this ruling is a call to action: review estate plans now, file Form 706 proactively, and document every step to ensure the DSUE amount is preserved before the 2026 exemption sunset further complicates planning.