West Virginia Estate Tax and Federal Portability: What Surviving Spouses Must Know About the 9-Month Filing Deadline

For surviving spouses in West Virginia, the federal Form 706 portability filing is generally due within nine months of the first spouse's death (or up to 15 months with a timely extension). An eligible estate that was not otherwise required to file may use the late-election procedure under Revenue Procedure 2022-32 for up to five years. This is the portability election, and missing the applicable filing windows is one of the most consequential and least-discussed mistakes in West Virginia estate administration — not because most estates owe federal estate taxes now, but because failing to act can forfeit a permanent tax benefit that could matter significantly when the surviving spouse eventually dies.

West Virginia has no state estate tax and no inheritance tax. Most West Virginia families hear this and conclude there is nothing to do at the federal level either, because the current federal estate tax exemption is so high that most estates will not owe a dollar. That conclusion costs some families tens or hundreds of thousands of dollars in federal estate taxes at the second death.

What Portability Is and Why It Matters

The federal estate tax exemption is the total value of assets an individual can transfer at death free of federal estate tax. For 2026, following the passage of legislation extending and expanding the Tax Cuts and Jobs Act provisions, the federal exemption exceeds $15 million per individual.

When one spouse dies and leaves less than their full exemption worth of assets, the unused portion — called the Deceased Spouse's Unused Exclusion (DSUE) — can be transferred to the surviving spouse through the portability election. The surviving spouse adds the DSUE to their own exemption, effectively having a doubled exemption available when they eventually die.

The mandatory step: To claim portability, the executor of the first spouse's estate must file a federal Form 706 (United States Estate Tax Return) within nine months of the first spouse's death. There is no automatic transfer. There is no state filing in West Virginia that accomplishes this. A timely extension can extend the filing period to 15 months. If the return is not filed within that nine- or 15-month period, an estate that was not otherwise required to file based on gross asset value may still use the five-year procedure under Revenue Procedure 2022-32; otherwise, the DSUE is forfeited.

The irony: Most estates filing Form 706 solely for portability owe zero federal estate tax. The filing is not triggered by a tax bill — it is triggered by the strategic decision to protect the surviving spouse's future tax position.

Who Needs to Think Carefully About This

West Virginia Estates Where Portability Matters Most

Married couples with combined assets approaching $15-30 million. If the combined estate of both spouses is large enough that the second death might exceed a single exemption, portability is critical. West Virginia's coal and gas families, agricultural landowners, and business owners with valuable mineral rights interests may find their combined estate in this range even if each spouse's individual estate looks modest.

Surviving spouses likely to inherit significant assets in the future. A surviving spouse who inherits a modestly valued estate today but expects to inherit additional family wealth, benefit from mineral rights appreciation, or see significant real estate appreciation over time should consider portability even if the current combined value is well below the exemption.

Surviving spouses who will remarry. The DSUE transfers from the last deceased spouse only. If the surviving spouse remarries and the new spouse predeceases them, a new portability opportunity arises. But losing the first DSUE by not filing is a permanent loss.

Estates where one spouse owned the majority of assets. If one spouse held most of the family wealth and the surviving spouse holds relatively little, the surviving spouse may exceed their own exemption at second death even if the combined estate is far below the current threshold. Portability protects against this.

What Filing Form 706 for Portability Requires

Filing Form 706 solely for the portability election is different from filing it because the estate owes federal estate tax. The mechanics are similar — complete the return with all estate assets and values — but the outcome is zero tax owed and an official elected DSUE amount.

What is required:

• The gross estate inventory: Every asset owned or controlled by the decedent at death, including assets in a living trust, gifts within three years of death, the decedent's share of jointly held property, and the full value of any life insurance over which the decedent held incidents of ownership. The ET 6.01 (West Virginia Appraisement of the Estate) covers probate assets but is not the same as the Form 706 gross estate calculation, which includes nonprobate assets as well.
• Deductions: Funeral expenses, administration expenses (attorney fees, probate fees, appraiser costs), marital deductions (assets passing to the surviving spouse), and charitable deductions.
• The DSUE calculation: The net result of the exemption minus the taxable estate produces the DSUE amount, which the surviving spouse can then use.
• Professional appraisals: Mineral rights, closely held business interests, and real property require documented fair market valuations at the date of death. These valuations appear on both the WV ET 6.01 and the federal Form 706, and the two must be consistent — Part 1 of the ET 6.01 explicitly asks whether a Form 706 is being filed.

The nine-month window: The Form 706 is due nine months after the date of death. A six-month extension (to 15 months total) is available if requested before the nine-month deadline via Form 4768. The extension to file does not extend the time to pay any tax owed — but for portability-only filers, no tax is owed, so the extension is purely procedural.

The Relationship Between Form 706 and West Virginia's ET 6.01

West Virginia's ET 6.01 and the federal Form 706 are separate filings with different recipients (County Clerk versus IRS), different timing (90 days from qualification versus nine months from death), and different coverage (probate assets only versus the full gross estate). But they are connected in two important ways.

Consistency requirement: Part 1 of the ET 6.01 asks the executor under oath whether a federal Form 706 is being filed. If you answer yes, the state and federal valuations must be consistent — you cannot report a different value for the family home on the ET 6.01 versus Form 706.

The ET 6.01 informs Form 706: The probate asset valuations you develop for the ET 6.01 — real estate appraisals, mineral rights yield capitalization calculations, business interest valuations — feed directly into the Form 706. Developing accurate valuations for one filing supports the accuracy of the other.

Who Needs a CPA or Estate Attorney for This Decision

Portability analysis is not a DIY decision in most cases. The strategic question — whether filing Form 706 for portability makes sense — depends on:

• Current total combined asset value for both spouses
• Expected future appreciation (particularly mineral rights, real estate, family business interests)
• Likelihood of remarriage
• Whether the estate includes assets in trust structures that interact with portability rules

For married West Virginia families where the combined estate is well below $5 million with no significant appreciation expected, portability may not justify the cost of a CPA or attorney preparing Form 706. For families in the $5-15 million range, or families with mineral rights, agricultural land, or business interests that could appreciate significantly, the analysis deserves professional attention.

The nine-month window is the critical constraint. Consulting a CPA or estate attorney proactively — within the first few months after the death — leaves time to complete the analysis and prepare the return if portability makes sense.

Comparison: Electing vs. Not Electing Portability

Who This Is For

• Surviving spouses whose first reaction was "we have no estate tax to worry about" — the portability election is about the future, not the present
• Executors who are completing the ET 6.01 within the 90-day window and need to understand whether a separate federal Form 706 filing is also appropriate
• Families with West Virginia mineral rights, agricultural land, or business interests where asset appreciation over the surviving spouse's lifetime could push the total estate value into federal estate tax territory
• Surviving spouses who will soon reach their own 70s or 80s and whose estate will grow from retirement account distributions and mineral royalties over the next decade

Who This Is NOT For

• Estates where the combined total of both spouses' assets is well below $5 million, with no significant appreciated assets expected — portability provides no practical benefit
• Surviving spouses who have passed the applicable filing deadlines, including the five-year late-election window for eligible portability-only estates, without filing Form 706 — the DSUE is forfeited and cannot be recovered
• Situations where the decedent was not a U.S. citizen or was married to a non-citizen, which involves different estate tax rules around Qualified Domestic Trusts

Frequently Asked Questions

West Virginia has no estate tax. Why would I need to file a federal Form 706?

West Virginia's lack of a state estate tax is irrelevant to the federal portability election. Form 706 is a federal filing. The portability election transfers the deceased spouse's unused federal exemption to the surviving spouse. The decision to file — or not file — affects federal tax exposure at the second spouse's death, which is entirely governed by federal law regardless of what West Virginia does or does not do at the state level.

How much does it cost to file Form 706 for portability only?

The cost depends on the complexity of the estate's assets. A CPA or estate attorney preparing Form 706 for a straightforward estate (standard bank accounts, a home, basic investments) may charge a few thousand dollars. Estates with mineral rights requiring formal appraisals, closely held business interests, or complex trust structures will cost more. The question is whether the strategic benefit of preserving the DSUE — potentially exempting millions from federal tax at the second death — justifies the filing cost.

What is the West Virginia connection between the ET 6.01 and federal Form 706?

Part 1 of the WV ET 6.01 asks under oath whether a federal Form 706 is being filed. If it is, the valuations on both forms must be consistent. An executor who develops date-of-death valuations for real estate, mineral rights, and business interests for the ET 6.01 has already done most of the asset inventory work needed for Form 706 — the two filings are complementary, not duplicative.

Can I still elect portability after the nine-month deadline?

In limited circumstances, yes. The IRS has provided a simplified method for estates that were not required to file Form 706 (because no tax is owed) to make a late portability election up to five years from the date of death, using a procedure established in Revenue Procedure 2022-32. Eligibility and filing requirements apply, so acting within the nine-month window (or within 15 months with a timely extension) avoids the late-election procedure.

Does portability apply to West Virginia's probate fees?

No. Portability is a federal estate tax concept. West Virginia's county probate fees are calculated on the value of the probate estate (the ET 6.01 total) and are paid to the County Clerk. They are separate from federal estate tax and unaffected by portability elections.

West Virginia estates do not owe state death taxes, but surviving spouses face a nine-month federal filing deadline, with a five-year late-election procedure available to eligible portability-only estates. The West Virginia Final Tax & Estate Tax Guide covers the relationship between the ET 6.01 and Form 706, the portability election mechanics, the filing deadlines, the mineral rights and real estate valuation requirements that support both filings, and the full administrative timeline from qualification through final settlement — so you make the portability decision with complete information.

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