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 for a portability election under § 2010(c)(5)(A), allowing the estate to file a late election after determining the taxpayer acted reasonably and in good faith. The ruling, issued in a non-precedential private letter ruling (PLR-120464-25), provides temporary relief for estates that missed the regulatory deadline to elect portability of a deceased spouse’s unused exclusion (DSUE) amount.

Estate Fails to File Timely Portability Election Despite Unused Exclusion Amount

The estate of the decedent failed to file a timely portability election under Section 2010(c)(5)(A), which permits a surviving spouse to inherit the deceased spouse’s unused estate tax exemption (the Deceased Spousal Unused Exclusion, or DSUE). The decedent died on an unspecified date, survived by their spouse. The estate’s representatives later represented that, based on the value of the decedent’s gross estate and any adjusted taxable gifts, the estate was not required to file Form 706 under Section 6018(a). Despite this, the estate later discovered the existence of an unused applicable exclusion amount—the DSUE—that could have been ported to the surviving spouse had a timely election been made.

For reasons not specified in the submission, the estate did not file Form 706 within the regulatory deadline of nine months after the decedent’s date of death, as required under Section 20.2010-2(a)(1) of the Estate Tax Regulations. The failure to file timely meant the portability election was not made, depriving the surviving spouse of the opportunity to utilize the DSUE. The estate only became aware of the missed election after the deadline had passed and subsequently submitted a request for an extension under Section 301.9100-3 to make the portability election retroactively.

IRS Grants Extension Under § 301.9100-3 for Reasonable and Good Faith Actions

Section 2010(c)(5)(A) requires that a portability election under the deceased spousal unused exclusion (DSUE) be made on a timely filed estate tax return, as defined by regulation. Specifically, § 20.2010-2(a)(1) sets the due date for such a return—including the portability election—at nine months after the decedent’s date of death, or the last day of any extension period granted under § 6081. The election is irrevocable once made and cannot be made if the return is filed after the prescribed deadline, including any extensions.

Where a regulatory election deadline like the portability election is missed, the IRS possesses discretionary authority under § 301.9100-1(c) to grant a reasonable extension of time to make the election. Section 301.9100-3 provides the operative standards for such relief when the election deadline is prescribed by regulation rather than by statute. Under § 301.9100-3, the Commissioner may grant an extension if the taxpayer demonstrates that they acted reasonably and in good faith and that granting relief will not prejudice the interests of the government.

In this case, the estate represented that the value of the gross estate and any adjusted taxable gifts fell below the threshold requiring a mandatory estate tax return under § 6018(a). As a result, the portability election deadline was fixed by regulation, not statute, bringing the estate within the scope of § 301.9100-3. The estate submitted information, affidavits, and representations explaining the circumstances that prevented timely filing. Based solely on the submitted materials, the IRS concluded that the estate had satisfied the requirements of §§ 301.9100-1 and 301.9100-3.

Therefore, the IRS granted the estate a 120-day extension from the date of the letter to make the portability election. The election must be made by filing a complete and properly prepared Form 706, together with a copy of the IRS letter granting the extension, within 120 days of the letter’s date. The filing must be sent to the Kansas City Service Center at the following address: Department of the Treasury, Internal Revenue Service Center, Kansas City, MO 64999.

Extension Void if Estate Later Found Required to File Form 706

The IRS’s extension under § 301.9100-3 is conditional and revocable. If it is later determined that the estate was required to file Form 706 under § 6018(a)—which mandates filing when the gross estate plus adjusted taxable gifts exceeds the basic exclusion amount—the extension is deemed null and void. The IRS explicitly stated: “If it is later determined that, based on the value of the gross estate and taking into account any taxable gifts, Decedent’s estate is required to file an estate tax return pursuant to § 6018(a), the Commissioner is without authority under § 301.9100-3 to grant an extension of time to elect portability and the grant of the extension referred to in this letter is deemed null and void.”

This caveat creates significant risk for the estate and surviving spouse. If the estate later fails to meet the filing threshold but was initially misclassified, the portability election becomes unenforceable, and the surviving spouse loses the ability to use the deceased spouse’s unused exclusion (DSUE). The IRS did not opine on whether the estate was required to file Form 706 in this ruling, leaving the determination to a future audit. As the IRS noted: “We neither express nor imply any opinion concerning the tax consequences of any aspect of any transaction or item discussed or referenced in this letter.” The DSUE amount’s validity will also be subject to audit, with the surviving spouse bearing the burden of substantiation under § 20.2010-3(c)(1) and (d).

Implications for Estates Seeking Portability Election Extensions

The IRS’s grant of a 120-day extension under § 301.9100-3 in this ruling underscores a critical but often overlooked risk: portability elections are not self-executing. Even estates that believe they qualify for automatic relief under Revenue Procedure 2022-32 must recognize that the IRS’s discretionary relief under § 301.9100-3 remains the only recourse for estates that missed the 9-month filing deadline for Form 706. The IRS’s decision to grant the extension hinged on the estate’s demonstration of reasonable and good faith actions, specifically its reliance on professional advice and prompt correction upon realizing the error. This highlights that reasonable cause is not presumed—it must be documented with contemporaneous evidence, such as advisor correspondence or internal records showing the estate’s intent to comply.

For estates above the filing threshold, the implications are stark. The IRS’s refusal to opine on whether Form 706 was required in this ruling means that the validity of the DSUE amount remains contingent on future audit scrutiny. Estates must prepare for potential challenges under § 20.2010-3(c)(1) and (d), which place the burden of substantiation on the surviving spouse to prove the deceased spouse’s unused exclusion amount. Practitioners advising estates in similar situations should file protective refund claims if the portability election is granted late, as the IRS’s non-precedential ruling does not shield estates from future adjustments. The estate’s failure to file Form 706 timely—despite the IRS’s eventual grant of relief—serves as a cautionary tale that extensions are not guaranteed, and reliance on § 301.9100-3 relief should be a last resort, not a planning strategy.

The non-precedential nature of this PLR further complicates matters. While the ruling provides temporary relief for this taxpayer, it offers no legal protection for other estates facing similar circumstances. The IRS explicitly states in § 6110(k)(3) that PLRs “may not be used or cited as precedent,” meaning estates seeking extensions must still submit their own ruling requests or rely on Revenue Procedure 2022-32 if eligible. For estates below the filing threshold, the 5-year window under Rev. Proc. 2022-32 remains the most reliable path to relief, but even this procedure requires strict adherence to deadlines and procedural requirements. Advisors should counsel clients that proactive filing of Form 706—even when not strictly required—is the only way to eliminate uncertainty surrounding DSUE eligibility.

The IRS’s caveat that the estate’s filing requirement was not addressed in this ruling introduces another layer of risk. If the estate later determines it was required to file Form 706 (e.g., due to a higher-than-anticipated valuation), the extension granted under § 301.9100-3 could be retroactively voided. This underscores the need for pre-filing due diligence, including a preliminary valuation analysis to confirm whether the estate meets the filing threshold. Practitioners should also document all communications with the IRS during the ruling process, as the agency’s failure to opine on the filing requirement does not absolve estates of their compliance obligations. In short, while this PLR provides a roadmap for securing extensions, it also serves as a reminder that portability elections are not a substitute for timely compliance.