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

IRS Grants 120-Day Extension for Portability Election After Untimely Filing

The IRS granted a 120-day extension under § 301.9100-3 to an estate seeking to elect portability under § 2010(c)(5)(A), allowing the surviving spouse to claim the decedent’s deceased spousal unused exclusion (DSUE) amount. The estate, which was not required to file Form 706 under § 6018(a), discovered after the deadline that a portability election had not been made. The IRS ruled in favor of the estate, emphasizing that taxpayers must demonstrate reasonable cause and act in good faith to qualify for such extensions.

The Question: Can an Estate Get More Time to Elect Portability?

The estate sought clarity on whether it could secure additional time to make a portability election under § 2010(c)(5)(A) after failing to file a timely estate tax return. Portability, as defined by § 2010(c)(5)(A), permits a surviving spouse to inherit a deceased spouse’s unused estate tax exemption—known as the deceased spousal unused exclusion (DSUE) amount—thereby increasing the surviving spouse’s own exemption. The estate’s predicament stemmed from its realization that no portability election had been made, despite the decedent’s estate falling below the § 6018(a) filing threshold, which would have otherwise exempted it from filing Form 706.

The estate represented to the IRS that the decedent’s gross estate value, combined with any taxable gifts, did not exceed the filing requirement, yet a DSUE amount remained available. Without a timely portability election, the surviving spouse would forfeit the ability to utilize the decedent’s unused exemption, permanently reducing the couple’s combined estate tax shield. The estate’s request centered on whether the IRS would grant an extension under § 301.9100-3 to retroactively elect portability, given the absence of a prior filing obligation and the discovery of the oversight after the statutory deadline.

The Facts: Why the Estate Missed the Deadline

The decedent died on an unspecified date, leaving a surviving spouse. The estate represented that based on the value of the decedent’s gross estate and after accounting for any taxable gifts, the estate was not required to file an estate tax return under § 6018(a), which sets the threshold for filing Form 706, United States Estate (and Generation-Skipping Transfer) Tax Return. The estate further represented that there was an unused portion of the decedent’s applicable exclusion amount—commonly referred to as the Deceased Spousal Unused Exclusion (DSUE)—which could only be claimed by the surviving spouse through a portability election.

A portability election is made by filing a complete and properly prepared Form 706 within the statutory deadline, unless the estate qualifies for an opt-out under § 20.2010-2(a)(2) of the Estate Tax Regulations. In this case, no estate tax return was filed within the required timeframe, and no portability election was made. The estate later discovered the oversight and submitted a request for an extension of time under § 301.9100-3 to retroactively elect portability. The reason for the untimely filing was not specified in the ruling, but the estate took corrective action by filing the extension request after identifying the error.

The Ruling: IRS Grants 120-Day Extension Under § 301.9100-3

The IRS granted the estate’s request for a 120-day extension under § 301.9100-3 to retroactively elect portability, concluding that the estate satisfied the regulatory requirements for relief. Section 301.9100-3 authorizes the Commissioner to grant extensions of time for regulatory elections—those whose due dates are set by regulation rather than statute—when the taxpayer demonstrates that they acted reasonably and in good faith, and that granting relief would not prejudice the government’s interests. The estate’s request relied on this provision, asserting that the failure to timely file Form 706 and elect portability was inadvertent and corrected upon discovery.

The IRS applied the two-pronged test under § 301.9100-3 and § 301.9100-1(c), which grants the Commissioner discretion to extend the time for making regulatory elections under all subtitles of the Internal Revenue Code except for certain excluded provisions. The estate was required to show that its actions were reasonable and in good faith, and that the government would not be prejudiced by the delay. Based on the representations submitted—including affidavits and supporting documentation—the IRS concluded that the estate met both conditions. The agency emphasized that the estate had taken corrective action promptly after identifying the oversight and that no evidence suggested an intent to avoid tax liability.

As a result, the IRS granted a 120-day extension from the date of the ruling letter, allowing the estate to file a complete and properly prepared Form 706 to elect portability. The election must be made by filing the return and a copy of the IRS letter within 120 days to the Kansas City Service Center. The IRS explicitly stated that a Form 706 filed within this period would be considered timely for purposes of the portability election.

However, the relief is conditional. The IRS cautioned that if it is later determined that the estate was actually required to file Form 706 under § 6018(a)—based on the value of the gross estate and taxable gifts—the extension granted under § 301.9100-3 is void. In such a case, the estate would lose the benefit of the extension, and the portability election would not be recognized. This caveat underscores the importance of accurately assessing filing obligations at the time of the decedent’s death.

Implications: What This Means for Other Estates and Taxpayers

The IRS’s conditional relief in this PLR underscores three critical lessons for estates navigating portability elections. First, the timely filing of Form 706 remains the cornerstone of preserving portability. Section 20.2010-2(a)(1) explicitly ties the validity of a portability election to a timely filed return, and the IRS’s warning that an extension under § 301.9100-3 becomes "null and void" if the estate later exceeds the filing threshold (per § 6018(a)) reinforces this point. Estates must therefore err on the side of filing—even if the gross estate appears below the $13.61 million exemption in 2026—because the consequences of miscalculating filing obligations are irreversible.

Second, the IRS’s willingness to grant extensions under § 301.9100-3 hinges on reasonable action and good faith, not mere oversight. The ruling’s emphasis on the estate’s "reasonable" efforts to comply—paired with the caveat that relief is void if the estate was later found to exceed the filing threshold—highlights that the IRS evaluates both the cause of the delay and the taxpayer’s diligence. Taxpayers seeking similar relief should document contemporaneous records (e.g., communications with advisors, medical records if illness caused the delay) to substantiate their claims. The IRS’s silence on the specific facts of the estate’s delay in this PLR suggests that proactive documentation is the best defense against denial.

Third, the PLR’s non-precedential nature and the IRS’s explicit disclaimer about the DSUE amount’s substantiation requirements carry broader implications. Section 6110(k)(3) bars PLRs from being cited as precedent, meaning estates cannot rely on this ruling alone to justify a late election. Moreover, the IRS’s statement that the DSUE amount "will be included in the applicable exclusion amount of Spouse only to the extent that Spouse can substantiate such amount" signals heightened scrutiny during audits. Practically, this means estates must retain appraisals, gift tax returns, and other valuation evidence to support any claimed DSUE, as the IRS will not accept the PLR’s conclusions at face value.

For estates in similar situations, the takeaway is clear: act promptly and consult a tax professional. The IRS’s conditional relief is a lifeline, but it is not a substitute for compliance. Estates that miss the 9-month deadline should file for an extension under § 301.9100-3 immediately, gather evidence of reasonable cause, and prepare for potential IRS scrutiny of the DSUE amount. The risk of voiding the extension—if the estate is later found to exceed the filing threshold—demands a conservative approach to filing obligations and a meticulous record-keeping strategy.