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

IRS Permits Late Portability Election for Estate Under Discretionary Authority

The IRS granted a 120-day extension to file Form 706, allowing a surviving spouse to claim the deceased spouse’s unused exclusion (DSUE) amount under § 2010(c)(5)(A). This relief, issued under § 301.9100-3, preserves a potentially substantial estate tax exemption for the surviving spouse despite the estate’s failure to file a timely portability election. The decision underscores the IRS’s discretionary authority to extend regulatory deadlines when taxpayers demonstrate reasonable cause and good faith.

Estate Fails to File Timely Portability Election Despite Unused Exclusion Amount

The decedent died on [Date], survived by a spouse. 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 § 6018(a), which mandates estate tax returns only when the gross estate exceeds the applicable exclusion amount. However, the estate sought to transfer the deceased spouse’s unused exclusion (DSUE) amount to the surviving spouse through a portability election under § 2010(c)(5)(A).

A portability election is made by timely filing a complete and properly prepared Form 706, as outlined in § 20.2010-2(a)(2) of the Estate Tax Regulations. The election must be filed within nine months of the decedent’s death, or within the extended period if an extension is granted. Despite the existence of an unused exclusion amount, the estate failed to file Form 706 within the prescribed deadline, resulting in the loss of the portability election opportunity.

Following discovery of the missed deadline, the estate submitted a request for an extension of time under § 301.9100-3 to make the portability election. The request sought relief from the regulatory deadline due to the estate’s failure to act within the required timeframe.

IRS Grants Extension Under § 301.9100-3: Reasonable Action and Good Faith

The IRS granted the estate’s request for a discretionary extension under § 301.9100-3, which permits the Commissioner to extend deadlines for regulatory elections when the taxpayer demonstrates reasonable cause and good faith. This regulation applies to elections whose due dates are set by regulation—not by statute—such as the portability election under § 20.2010-2(a)(1), which requires filing Form 706 within nine months of a decedent’s death (or the last day of an extension period).

To qualify for relief, the estate had to establish three criteria: (1) reasonable action, (2) good faith, and (3) no prejudice to the government’s interests. The IRS concluded the estate met these standards based on the representations and documentation submitted, which explained the circumstances leading to the missed deadline. Under § 301.9100-1(c), the Commissioner may grant an extension of up to six months (or longer for taxpayers abroad) for such elections, provided the taxpayer acts reasonably and in good faith.

The IRS approved a 120-day extension from the date of the ruling letter, requiring the estate to file a complete and properly prepared Form 706—along with a copy of the Private Letter Ruling—within that period at the Kansas City IRS Service Center. A timely filing under this extension will be treated as if it were filed within the original regulatory deadline. The IRS emphasized that if subsequent information reveals the estate was required to file Form 706 under § 6018(a) (based on the value of the gross estate and adjusted taxable gifts), the extension would be null and void, as § 301.9100-3 does not apply in such cases.

DSUE Amount and Future Implications for Surviving Spouse

The Deceased Spousal Unused Exclusion (DSUE) amount represents the portion of a deceased spouse’s basic exclusion amount (BEA) that remains unused after accounting for their taxable estate and adjusted taxable gifts. Under § 2010(c)(4), the DSUE can be transferred to the surviving spouse via a portability election, effectively increasing the surviving spouse’s applicable exclusion amount (AEA). For example, if a decedent’s BEA was $13.61 million in 2024 but their taxable estate was $5 million with $2 million in adjusted taxable gifts, the DSUE would be $6.61 million, allowing the surviving spouse to claim a total AEA of $20.22 million.

The IRS explicitly declined to opine on the specific DSUE amount in this ruling, noting that any claimed DSUE will be subject to determination by the Director’s office upon audit of the surviving spouse’s Federal gift or estate tax returns. The agency emphasized that substantiation—such as the deceased spouse’s Form 706 and supporting documentation—must be provided to validate the claimed amount under § 20.2010-3(c)(1) and (d). The ruling’s non-precedential nature further limits its applicability, meaning other taxpayers cannot rely on it as binding authority for similar fact patterns.

For surviving spouses, the DSUE offers a critical estate planning tool, particularly in cases where the first spouse’s estate was below the BEA. However, the ability to claim the DSUE hinges on strict compliance with filing requirements and substantiation standards. Taxpayers should note that the IRS’s discretionary authority under § 301.9100-3 does not extend to cases where the estate was otherwise required to file Form 706 under § 6018(a), as such filings trigger mandatory estate tax return obligations. The ruling underscores the importance of timely and accurate documentation to preserve the DSUE for future use.

Key Takeaways for Estate Planners and Taxpayers

The IRS’s discretionary relief under § 301.9100-3 offers a lifeline for late portability elections, but it is neither guaranteed nor a substitute for timely action. The agency granted relief in this case because the estate demonstrated reasonable action and good faith, relying on professional advice that failed to file the election within the initial 9-month window. However, the ruling hinges on the estate’s gross value remaining below the basic exclusion amount (BEA), as defined in § 2010(c)(5)(A), which permits portability only when no estate tax return is otherwise required under § 6018(a). Taxpayers must understand that this discretionary authority does not apply if the estate later proves to have been obligated to file Form 706, rendering the extension null and void under § 20.2010-2(a)(1).

For estate planners, the case underscores the critical importance of documenting reliance on professional advice and acting promptly when errors occur. The surviving spouse’s ability to claim the Deceased Spousal Unused Exclusion (DSUE) remains contingent on strict substantiation, as the IRS reserves the right to challenge the claimed amount during an audit under § 20.2010-3(c)(1) and (d). Practitioners should caution clients that Private Letter Rulings (PLRs) are non-precedential and cannot be cited as precedent, as clarified by § 6110(k)(3). While the IRS’s recent Revenue Procedure 2022-32 provides a 5-year automatic extension for estates below the BEA filing threshold, this case serves as a reminder that deadlines are not flexible by default—extensions are granted only under narrow circumstances.

Taxpayers and advisors must also recognize that the DSUE amount is not inflation-adjusted and is fixed at the decedent’s BEA at death, as confirmed by IRS Revenue Ruling 2023-2. Failure to file Form 706 within the statutory or discretionary deadlines risks permanent loss of the DSUE, leaving the surviving spouse with a reduced applicable exclusion amount. Estate planners should prioritize proactive filing and maintain meticulous records to substantiate DSUE claims, even when no estate tax liability exists. The IRS’s growing scrutiny of late portability elections, as evidenced by recent denials of PLRs for willful neglect, signals that timeliness and good faith documentation are non-negotiable.