Form 706, Portability, and Rev. Proc. 2022-32: The 5-Year Deadline Most Executors Miss

Here is the scenario that costs families millions of dollars every year: a person dies in Alaska, the estate is worth well under the federal exemption, no estate tax is owed, and the executor closes the estate without filing Form 706. Years later, the surviving spouse inherits additional assets, sells appreciated property, or faces a change in federal tax law — and suddenly owes estate tax they could have avoided entirely.

The mechanism they missed is portability. The clock to preserve it runs for five years from the date of death. Understanding when to file Form 706 — and when a late filing is still allowed under Rev. Proc. 2022-32 — is one of the highest-value decisions an executor makes.

What Form 706 Is and When It Is Required

IRS Form 706 (United States Estate and Generation-Skipping Transfer Tax Return) is the federal estate tax return. In 2026, the federal lifetime exemption is $15 million per individual, or $30 million for a married couple that elects portability. Estates with a gross value plus adjusted taxable gifts below $15 million owe zero federal estate tax and are not legally required to file Form 706 for tax liability purposes.

That is where most executors stop thinking about it. The problem is that Form 706 serves a second, entirely separate purpose: it is the only mechanism by which a surviving spouse can capture the deceased spouse's unused exclusion amount — the DSUE.

How the DSUE Portability Election Works

Under the federal portability rules, when one spouse dies and their estate does not use the full $15 million exemption, the unused portion does not simply disappear. The surviving spouse can carry it forward and add it to their own $15 million exemption — potentially sheltering up to $30 million from federal estate tax at the surviving spouse's death.

But this carry-forward is not automatic. The executor of the first spouse's estate must file Form 706 and explicitly elect portability. Without the election, the DSUE is permanently forfeited. The surviving spouse cannot go back and claim it later.

Why does this matter for Alaska estates where the first spouse's estate is modest? Three reasons:

1. Asset appreciation. The surviving spouse may have years or decades ahead. Real estate, investments, and business interests can grow substantially. A $3 million estate today could be a $12 million estate at the surviving spouse's death.

2. Inheritances. The surviving spouse may receive a large inheritance from their own family, pushing their estate over the exemption threshold.

3. Legislative risk. Federal exemption amounts are subject to Congressional change. The current $15 million threshold was set by the One Big Beautiful Bill Act and reflects political will as of 2026. Future legislation could reduce the exemption, converting what was a comfortable buffer into an estate tax liability. A $10 million DSUE could save $4 million in taxes under a scenario where the exemption drops to $5 million.

The Standard Deadline: Nine Months, Plus an Extension

The normal deadline to file Form 706 for portability purposes is nine months from the date of death. An automatic six-month extension is available using Form 4768, pushing the deadline to fifteen months.

Missing this deadline historically meant petitioning the IRS for a Private Letter Ruling — a process that could cost $10,000–$30,000 in professional fees and IRS user fees, with no guarantee of approval.

Rev. Proc. 2022-32: The Five-Year Simplified Extension

In 2022, the IRS issued Revenue Procedure 2022-32, which created a streamlined method for executors to make a late portability election up to five years after the decedent's date of death — without needing a Private Letter Ruling.

The requirements to use this simplified procedure are strict:

• The decedent must have been a U.S. citizen or resident on the date of death
• The decedent must have been survived by a spouse
• The estate must not have been otherwise required to file Form 706 based on the gross estate's value (i.e., the estate was genuinely below the filing threshold)
• No Form 706 must have previously been filed for this estate

If all four conditions are met, the executor can file a late Form 706 at any point within five years of the date of death, solely to elect portability. No IRS approval is needed beyond submitting the return with the correct notation.

The notation is mandatory. The top of the Form 706 must state exactly:

"FILED PURSUANT TO REV. PROC. 2022-32 TO ELECT PORTABILITY UNDER SECTION 2010(c)(5)(a)"

Omitting this notation can cause the IRS to treat the late return as a standard delinquent filing, triggering penalties and potentially rejecting the portability election.

Why Alaska Executors Specifically Miss This

Alaska is one of 38 states with no state-level estate tax. When an executor in Alaska is told that no state estate tax exists and the federal estate is well under $15 million, the natural conclusion — often reinforced by well-meaning but non-specialist advice — is that no tax-related filing is required at all.

That logic is correct for the liability calculation. It is wrong as a filing strategy. The portability election requires a proactive filing even when zero tax is owed. An estate that generates no tax liability can still generate a multi-million-dollar future benefit for the surviving spouse by triggering the DSUE.

This error is particularly common with modest Alaska estates — a home in Anchorage worth $500,000, some retirement accounts, and an Alaska Permanent Fund account. The executor sees no tax owed, wraps up the estate efficiently, and 10 years later the surviving spouse is facing a $15 million estate tax problem with no DSUE to offset it.

The Decision-Making Framework

The portability election analysis is not something to do alone. A CPA or estate planning attorney should evaluate:

• The size of the first estate relative to the exemption, and how much DSUE would be available
• The surviving spouse's current asset picture and projected growth
• The surviving spouse's age and expected time horizon
• Whether the surviving spouse remarries (a subsequent marriage and the death of that spouse can affect DSUE mechanics)
• Current political environment around federal exemption levels

For most Alaska married couples where the first spouse's estate is under $10 million, the cost of filing Form 706 (typically $2,500–$5,000 for a basic return) is trivially small compared to the potential DSUE benefit it preserves.

The Alaska Community Property Interaction

Alaska estates involving a Community Property Trust (under AS 34.77) have an additional consideration. Community property assets receive a full double step-up in basis under IRC Section 1014(b)(6) at the first spouse's death. That step-up, combined with portability, can produce significant combined tax savings. The executor should document the stepped-up basis on all community property assets and separately evaluate the portability election — these are two distinct benefits that both require action at the first death.

For a complete walkthrough of Form 706, portability mechanics, and how they interact with Alaska's community property rules, the Alaska Final Tax & Estate Tax Guide at /us/alaska/estate-tax/ covers both in detail.

The Bottom Line

Filing Form 706 is not just about paying estate tax — it is about preserving a tax benefit for the surviving spouse that cannot be recovered once the five-year window closes. Rev. Proc. 2022-32 bought executors more time than they used to have, but five years passes quickly when you are not watching the calendar.

If the decedent was married, the estate was below the filing threshold, and no Form 706 has been filed — check the date of death and calculate how much time remains. The cost of filing is far lower than the cost of missing it.

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