Portability After a Spouse Dies: Why IRS Form 706 Can Matter Even When No Tax Is Due
Published October 8, 2026
Portability After a Spouse Dies: Why IRS Form 706 Can Matter Even When No Tax Is Due
When a spouse passes away, tax planning is often the last thing on a surviving spouse's mind, especially if the estate falls well below federal estate tax thresholds. However, taking a deliberate step to file a federal estate tax return can save significant money down the road.
Understanding how federal tax elections protect surviving spouses helps families in Westlake Village, Thousand Oaks, Ventura County, and Los Angeles County preserve long-term wealth.
What Is Estate Tax Portability?
Federal estate tax laws generally allow a surviving spouse to use the unused portion of a deceased spouse's federal estate and gift tax exemption. This concept is known as portability, and the transferred exemption is called the deceased spousal unused exclusion (DSUE).
For example, if a spouse passes away in 2026 when the federal basic exclusion amount is $15 million, and their taxable estate and prior taxable gifts use only $5 million of that exemption after applicable deductions, $10 million in unused exemption remains. Through a valid portability election, that remaining $10 million becomes available to the surviving spouse for future taxable gifts or transfers at death.
Why File Form 706 If No Tax Is Owed?
Portability is not automatic. To claim the DSUE, the executor or other authorized representative of the deceased spouse's estate must timely file a complete and properly prepared IRS Form 706 (United States Estate (and Generation-Skipping Transfer) Tax Return).
Even when an estate is below the filing threshold, Form 706 is still required to elect portability. Skipping this step can mean losing the unused exemption unless late-election relief is available.
Important Filing Deadlines and Relief Options
Timing is critical when handling tax elections:
- Standard Deadline: Form 706 is generally due within nine months of the date of death.
- Automatic Extension: Executors can obtain an automatic six-month filing extension by filing Form 4768 on or before the nine-month
- Late Election Relief: Under Revenue Procedure 2022-32, certain estates that were not otherwise required to file an estate tax return may obtain simplified relief by filing a qualifying Form 706 on or before the fifth anniversary of death.
Certain estates may seek individual IRS relief after five years, but approval is not guaranteed.
When Should Families Evaluate Portability?
Portability is not necessary for every married couple, but it warrants careful review in several common scenarios:
- Appreciating Real Estate: High-value property in Southern California can appreciate substantially over a surviving spouse's lifetime.
- Business Interests: Growth in family-owned businesses can push a surviving spouse's estate over future exemption limits.
- Future Inheritances or Gifts: Anticipated windfalls or lifetime gifts can significantly alter an individual's tax exposure over time.
Securing the DSUE can provide a cushion against future asset growth and potential changes to federal tax laws.
Coordinated Professional Guidance
Making an informed decision about portability requires collaboration among your estate planning attorney, CPA, tax advisor, and executor. Evaluating current asset values, future projections, and filing costs helps you weigh the potential tax savings.
Jokela Estate Law helps surviving spouses and executors throughout Ventura County, Los Angeles County, and surrounding California communities navigate post-death administration, related estate planning , and tax elections with practical legal guidance and clear direction.
To view Russell Jokela's availability for a trust administration consultation, click here.
Disclaimer: This article is for general informational purposes only and is not legal advice. Reading this article does not create an attorney-client relationship. Tax rules and filing requirements depend on individual circumstances and current law.
