Missed the Form 706 Portability Election? IRS Relief May Still Be Available

Missing the deadline to file Form 706 for purposes of electing portability can prevent a surviving spouse from using a deceased spouse’s unused federal estate and gift tax exclusion. That result, however, may not always be final.

In Private Letter Rulings 202631007 and 202631009, the Internal Revenue Service granted two separate estates an additional 120 days from the dates of their respective ruling letters to make portability elections under Internal Revenue Code Section 2010(c)(5)(A).

Each estate was required to file a complete and properly prepared Form 706, United States Estate and Generation Skipping Transfer Tax Return, together with a copy of its ruling letter. A return filed within the applicable 120 day period would be considered timely filed solely for purposes of electing portability.

The rulings were publicly released on July 31, 2026, but the letters were dated April 29, 2026, and May 4, 2026. The 120 day periods began on the dates of the respective letters, not on the public release date.

Portability is not automatic. The executor of the deceased spouse’s estate must file a complete and properly prepared Form 706 and make the portability election before the surviving spouse may use the deceased spousal unused exclusion amount.

What Is an Estate Tax Portability Election?

Portability allows a surviving spouse to add a deceased spouse’s unused applicable exclusion amount to the surviving spouse’s own applicable exclusion amount. The transferred amount is known as the deceased spousal unused exclusion amount, commonly abbreviated as DSUE.

Internal Revenue Code Section 2010(c)(2) provides that a surviving spouse’s applicable exclusion amount is the sum of the surviving spouse’s basic exclusion amount and the DSUE amount available from the surviving spouse’s last deceased spouse.

The surviving spouse may potentially use the DSUE amount against taxable transfers made during life or transfers occurring at death. Portability can therefore remain valuable even when no federal estate tax was due when the first spouse died.

The value of the election may increase when the surviving spouse owns appreciating real estate, a business, investment assets, or other property that could cause the surviving spouse’s eventual estate to exceed the federal estate tax exclusion then available.

What Is the Normal Portability Election Deadline?

Treasury Regulation Section 20.2010-2(a)(1) generally provides that an estate tax return filed to elect portability is due nine months after the decedent’s date of death. If a valid extension of time to file has been obtained, the return is due by the last day of the extension period.

Under Treasury Regulation Section 20.2010-2(a)(2), the timely filing of a complete and properly prepared Form 706 by the estate of a decedent survived by a spouse generally constitutes the portability election unless the executor satisfies the requirements for electing out of portability.

When a complete and properly prepared Form 706 is not timely filed, the portability election is not made unless the estate qualifies for an extension of time under an applicable relief procedure.

Why the Section 6018 Filing Threshold Matters

Internal Revenue Code Section 6018(a) generally requires an executor to file Form 706 when the decedent’s gross estate, together with the decedent’s adjusted taxable gifts, exceeds the applicable filing threshold for the year of death.

The availability of relief under Treasury Regulation Section 301.9100-3 depends on whether the estate was independently required to file Form 706 under Section 6018(a).

When an estate was not required to file under Section 6018(a) and would have filed Form 706 only to elect portability, Treasury Regulation Section 20.2010-2(a)(1) provides that an extension under Section 301.9100-3 may be available. In that situation, the time for making the election is treated as fixed by regulation.

By contrast, if the estate was required to file Form 706 under Section 6018(a), the IRS does not have authority under Treasury Regulation Section 301.9100-3 to grant the type of portability relief addressed in these rulings.

The estate value must therefore be determined carefully. The analysis includes both the value of the gross estate and the decedent’s adjusted taxable gifts.

Was a Form 706 portability election missed?

The decedent’s date of death, estate value, adjusted taxable gifts, prior filings, and elapsed time must be reviewed before selecting the appropriate relief procedure.

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What Is a Private Letter Ruling?

A private letter ruling, commonly called a PLR, is a written determination issued by the IRS in response to a taxpayer’s written request. It interprets and applies federal tax law to the specific facts and representations submitted by that taxpayer.

A taxpayer that receives a favorable PLR may ordinarily rely on it subject to the conditions and limitations stated in the ruling, the accuracy and completeness of the taxpayer’s representations, and any subsequent changes in applicable law.

A PLR is not authoritative guidance for other taxpayers. It is not equivalent to a Treasury regulation, revenue ruling, revenue procedure, or court decision. Internal Revenue Code Section 6110(k)(3) provides that a written determination generally may not be used or cited as precedent.

A PLR may nevertheless be informative. It can indicate how the IRS National Office applied existing law to the particular facts and procedural record presented by the requesting taxpayer. It does not establish that another taxpayer with similar facts is automatically entitled to the same result.

Private Letter Rulings 202631007 and 202631009 are therefore illustrations of the IRS application of Treasury Regulation Section 301.9100-3. They do not create a general 120 day relief period and do not guarantee relief for another estate.

What the Two 2026 Private Letter Rulings Actually Decided

Private Letter Ruling 202631009 was dated April 29, 2026. Private Letter Ruling 202631007 was dated May 4, 2026. Both were publicly released on July 31, 2026.

The rulings involved separate estates, but the relevant represented facts and legal analysis were substantially similar.

In each ruling:

• The decedent was survived by a spouse
• The estate represented that it was not required to file Form 706 under Section 6018(a), based on the value of the gross estate and taxable gifts
• The estate represented that the decedent had an unused portion of the applicable exclusion amount
• A complete and properly prepared Form 706 had not been timely filed
• A portability election had not been made
• The estate requested an extension under Treasury Regulation Section 301.9100-3
• Information, affidavits, and representations were submitted explaining the circumstances that caused the failure to timely make a valid election

The publicly released rulings do not disclose the specific reasons why the returns were not timely filed. Each ruling states only that the failure occurred for various reasons. The rulings therefore do not establish that any particular mistake, professional error, misunderstanding, or other specific circumstance will qualify for relief.

Based solely on the information and representations submitted, the IRS concluded in each case that the requirements of Treasury Regulations Sections 301.9100-1 and 301.9100-3 had been satisfied.

Each estate was granted 120 days from the date of its ruling letter to make the portability election. The election was to be made by filing:

• A complete and properly prepared Form 706
• A copy of the applicable private letter ruling

For purposes of electing portability, a Form 706 filed within the applicable 120 day period would be treated as timely filed.

The Relief Was Conditional

The relief in both rulings depended on the estates not being required to file Form 706 under Section 6018(a).

Each ruling stated that if the estate were later determined to have been required to file Form 706 based on the value of the gross estate and taxable gifts, the Commissioner would have no authority under Treasury Regulation Section 301.9100-3 to grant the extension. The relief would then be null and void.

The IRS also stated that it had not verified the materials submitted in support of either ruling. The information and representations remained subject to verification on examination.

Accordingly, the rulings do not independently establish that the estates were below the Section 6018(a) filing threshold. They establish that the IRS granted relief based on the representations presented by each requesting estate.

The Rulings Did Not Approve a DSUE Amount

The IRS expressly declined to determine the amount of DSUE potentially available to either surviving spouse.

A surviving spouse may include a DSUE amount in the surviving spouse’s applicable exclusion amount only to the extent the amount can be substantiated. The amount also remains subject to IRS determination upon examination of the relevant federal estate tax and gift tax returns.

A favorable ruling extending the election deadline therefore does not establish:

• The value of the gross estate
• The amount of adjusted taxable gifts
• The amount of the DSUE
• The federal tax treatment of any other transaction or item

Simplified Relief Within Five Years

Many estates do not need to request a private letter ruling if the late portability election can be made on or before the fifth anniversary of the decedent’s date of death.

Revenue Procedure 2022-32 provides a simplified method for obtaining an extension under Treasury Regulation Section 301.9100-3. Unlike a private letter ruling, a revenue procedure is published procedural guidance that may be used by taxpayers who satisfy its requirements.

The simplified method generally applies when:

• The decedent died after December 31, 2010
• The decedent was a United States citizen or resident
• The decedent was survived by a spouse
• The executor was not required to file Form 706 under Section 6018(a)
• The executor did not timely file Form 706
• A complete and properly prepared Form 706 is filed on or before the fifth anniversary of the decedent’s date of death

The executor must place the following statement at the top of Form 706:

FILED PURSUANT TO REV. PROC. 2022-32 TO ELECT PORTABILITY UNDER § 2010(c)(5)(A)

No IRS user fee is required to use the simplified procedure.

For an estate that meets the eligibility requirements and files on or before the fifth anniversary, Revenue Procedure 2022-32 is the exclusive procedure for obtaining an extension under Treasury Regulation Section 301.9100-3 to make the portability election. The IRS will not issue a private letter ruling when that simplified procedure is available.

Relief After the Fifth Anniversary

Once the fifth anniversary of the decedent’s death has passed, the simplified procedure under Revenue Procedure 2022-32 is no longer available.

An estate that was not required to file Form 706 under Section 6018(a) may request a private letter ruling seeking an extension under Treasury Regulation Section 301.9100-3.

Treasury Regulation Section 301.9100-3 generally requires the estate to establish to the satisfaction of the Commissioner that:

• The estate acted reasonably and in good faith
• Granting relief will not prejudice the interests of the federal government

The availability of relief depends on the complete factual and procedural record. The two 2026 private letter rulings do not identify the particular circumstances that satisfied these requirements, and they do not guarantee that another estate will qualify.

A Complete and Properly Prepared Form 706 Is Still Required

Neither Revenue Procedure 2022-32 nor a favorable private letter ruling eliminates the requirement to prepare and file Form 706.

The return must be complete and properly prepared in accordance with Treasury Regulation Section 20.2010-2(a)(7). Preparing the return generally requires information concerning:

• The decedent’s assets and ownership interests
• Date of death values
• Jointly owned property
• Beneficiary designated assets
• Prior taxable gifts
• Applicable deductions
• The computation of the DSUE amount

Treasury Regulation Section 20.2010-2(a)(7) permits special valuation reporting in certain portability returns involving qualifying property passing to a surviving spouse or charity. The exception is limited and must be evaluated based on the assets and transfers involved.

Information Needed to Evaluate a Late Portability Election

An executor or surviving spouse evaluating a missed portability election should gather:

• The decedent’s date of death
• Citizenship and residency information
• The will, trust, and related estate planning documents
• A complete list of assets and date of death values
• Information concerning jointly owned and beneficiary designated property
• Copies of prior federal gift tax returns
• Any previously filed Form 706 or extension request
• Records explaining why the portability election was not timely made
• Information about the surviving spouse’s assets, prior gifts, and anticipated estate planning

A Missed Portability Election May Still Be Corrected

A missed Form 706 portability deadline does not necessarily mean that the DSUE amount has been permanently lost.

An eligible estate may be able to use the simplified procedure under Revenue Procedure 2022-32 or request discretionary relief through a private letter ruling under Treasury Regulation Section 301.9100-3.

The correct procedure depends on the date of death, whether the estate was required to file under Section 6018(a), the amount of time that has passed, the estate’s filing history, and the circumstances surrounding the missed election.

I assist executors and surviving spouses with evaluating portability eligibility, preparing Form 706, calculating the DSUE amount, and addressing late portability election procedures. Additional information about my estate and trust tax services is available on the Services page.

Need Help With a Late Form 706 Portability Election?

The available relief procedure should be identified before additional time passes and important records become more difficult to obtain.

Contact Steven J. Cashiola, CPA

Primary Authorities and Guidance

Internal Revenue Code Sections 2010(c)(2) through 2010(c)(5), 6018(a), and 6110(k)(3); Treasury Regulations Sections 20.2010-2, 20.2010-3(c)(1), 20.2010-3(d), 301.9100-1, and 301.9100-3; and Revenue Procedure 2022-32.

Private Letter Rulings 202631007 and 202631009 are included as illustrative, taxpayer specific, nonprecedential rulings. They may not be used or cited as precedent.