Do We Have to File Form 706, the Federal Estate Tax Return?

Who Must File Form 706, and the $15 Million Threshold

Almost nobody owes federal estate tax. For a death in 2026, the return is mandatory only when the gross estate, plus the taxable gifts the person made during life, passes $15 million. That figure is permanent under the 2025 tax law and rises with inflation after 2026, so the fear that a middle-class family will stumble into estate tax is, for now, misplaced.

The trap is in how the $15 million is measured. The gross estate is far bigger than the probate estate the court sees. It counts the revocable trust everyone thought had settled matters, life insurance the person owned on their own life at full death benefit, jointly held property, retirement accounts, business interests, and real estate in other states, all at gross value before any mortgage or debt comes off. A family that thinks of the estate as "the house and the brokerage account" can be several million dollars low. The IRS also adds back the taxable lifetime gifts, which is how the estate tax and the gift tax share one $15 million allowance rather than granting two.

Two quick boundary notes. The threshold test uses gross value, so an estate can be under the line after debts and still over it for filing purposes. And a person who was not a US citizen or resident is under a different return, Form 706-NA, with a far lower exposure threshold; that is its own subject and its own deadline.

The 9-Month Deadline and the Form 4768 Extension

Form 706 is due 9 months after the date of death. Not nine months after probate opens, not nine months after the personal representative gets letters from the court. The clock starts at death, and by the time a family finishes the funeral, finds the documents, and opens the estate, a third of it is often gone.

Form 4768, filed before that deadline, gives an automatic 6-month extension of time to file, moving the paperwork to the 15-month mark. What it does not move is the money. Any estate tax is still due at 9 months, so the standard practice is to estimate the tax, send payment with the extension request, and settle the difference on the return. Interest runs on any shortfall from month nine forward, and a late-payment penalty can stack on top unless the estate shows reasonable cause. The same form has a separate section asking for more time to pay in hardship cases, which the IRS grants in yearly increments, but that is a request, not an automatic right.

The reason nearly every taxable estate files the extension is appraisals. Real estate, business interests, and unusual assets need qualified valuations, and good appraisers take months. Filing the 4768 early, with a conservative payment, is routine and costs the estate nothing but the interest math it was already facing.

The Portability Filing Most Families Should Consider

Here is the decision most families under the threshold never realize they are making. When a married person dies without using their $15 million exclusion, the unused portion does not automatically move to the surviving spouse. It moves only if the estate files Form 706 and elects portability, even though nothing is owed and no return was required. Skip the filing and the unused exclusion, which the rules call the DSUE (the deceased spousal unused exclusion), simply evaporates.

The stakes are easy to state. A widow with her own $15 million exclusion who also banks her late husband’s unused $15 million can shelter up to $30 million from estate tax. Nobody expects to need that. Then a business sells, real estate appreciates for twenty years, life insurance pays, or Congress changes the number, and the one-time filing that felt unnecessary at the funeral becomes the most valuable document in the family. A portability-only return is also cheaper than a full one, because the IRS permits simplified reporting, including estimated values, for most property passing to the spouse or to charity.

Two deadlines govern it. A timely election rides on a return filed within the normal 9 months plus the 6-month extension. A family that missed that entirely usually still has a way back. Under Rev. Proc. 2022-32, an estate that had no obligation to file can make a late portability-only filing at any time up to the fifth anniversary of the death, with a required statement on the first page of the return saying it is filed under that relief procedure. The relief belongs only to estates that were never required to file; a taxable estate that blew the deadline has a penalty problem instead.

One caution matters more than the rest in second marriages. A survivor can only use the unused exclusion of the last spouse to die. Remarry, outlive the new spouse too, and the first spouse’s banked exclusion is gone, replaced by whatever the second spouse left unused, which may be nothing. The full decision, including when filing is not worth it, is covered in our guide to the estate tax portability election.

What Goes on the Return

Form 706 is an inventory with a price tag on every line. The schedules walk through everything the person owned or controlled, real estate, stocks and bonds, cash and notes, life insurance, jointly owned property, business interests, annuities and retirement accounts, and certain transfers made during life. Against that, the estate deducts debts, funeral and administration expenses, what passes to the surviving spouse, and what passes to charity. The tax falls on what is left, at rates that reach 40%.

Every asset goes on at fair market value as of the date of death, and for anything without a ticker symbol that means a qualified appraisal. Real estate, closely held businesses, and partnership interests are where returns are won and lost, and where the IRS looks first. Those values then do double duty, because the figures on the 706 generally become the heirs’ new income tax basis, the fresh starting point covered in our step-up in basis guide. For married couples planning ahead, a Florida community property trust is one way to aim for that reset on both halves of the marital property at the first death.

The return also carries elections that shape the family’s taxes for decades, and they deserve more respect than the checkbox format suggests.

• The QTIP election, made on Schedule M, lets assets held in trust for the surviving spouse qualify for the unlimited marital deduction while the deceased spouse’s documents still control where the money goes next. It is the standard tool in blended families.
• Alternate valuation revalues the entire estate as of 6 months after death instead of the date of death. It is allowed only when it lowers both the estate’s value and the tax, and it is a real option when markets fall hard right after a death.
• The installment payout lets an estate pay the tax attributable to a closely held business over time when the business makes up more than 35% of the adjusted gross estate, with payments stretching as long as 14 years and a favorable 2% interest rate on part of the deferred tax. It exists so families do not have to sell the company to pay the tax on the company.
• Special-use valuation lets qualifying farm and family-business real property be valued as what it is actually used for rather than its development value, cutting the taxable value by up to $1,460,000 for a 2026 death, with strings attached for the next ten years of use.

The Closing Letter and the Form 8971 Clock

Filing is not quite the end. Two pieces of aftermath catch families who thought they were done.

The first is proof the IRS is finished. The estate tax closing letter is the IRS’s confirmation that the return was accepted or the examination concluded, and courts, banks, and title agents ask for it before final distributions. It is requested through Pay.gov for a $56 user fee (the fee dropped from $67 in May 2025), and the IRS suggests waiting about 9 months after filing before asking. The free alternative most people never hear about is an account transcript for the estate showing transaction code 421, which signals the same thing and satisfies most institutions at no cost.

The second is Form 8971, and its deadline is the one that surprises everyone. When a Form 706 was required to be filed, the executor must also send the IRS Form 8971 and give each beneficiary a Schedule A reporting the estate tax value of the property that beneficiary received. It is due 30 days after the return’s due date or 30 days after the return is actually filed, whichever comes first, which in practice means about a month after the 706 goes in, long before anyone hears back from the IRS. Penalties run per missed statement, and they apply even when the return showed no tax due. The beneficiaries are then held to those reported values as their income tax basis, so the schedule is not a formality; it is the number they will use when they sell. One clean exception. A return filed only to elect portability, or only as a protective filing, does not trigger Form 8971 at all.

The Florida Affidavits, DR-312 and DR-313

Florida will not tax the estate. The state has had no estate tax for deaths after 2004, and there is no Florida estate tax return to file, a piece of good news explained in full in our Florida estate tax guide. What Florida had instead was paperwork to prove the tax that no longer exists was not owed, and that paperwork still haunts real estate closings.

The two forms are affidavits from the Department of Revenue. DR-312, the Affidavit of No Florida Estate Tax Due, is used when the estate has no federal Form 706 obligation. DR-313 is its sibling for estates where a federal return is required. Each is signed by the personal representative, filed with the clerk of the circuit court in the county where the decedent owned property, and recorded in the official records. Neither is ever mailed to the Department of Revenue. Once recorded, the affidavit stands as evidence that no Florida estate tax is owed and clears the state’s old automatic estate tax lien, which is exactly what a title insurer wants to see before insuring a sale of the decedent’s real estate.

The part most checklists have not caught up with is that Florida changed the rule. For probate proceedings commenced on or after July 1, 2023, and for proceedings that were still pending without a final discharge on that date, Florida law dropped the affidavit requirement entirely, and no estate tax lien arises for post-2004 deaths in the first place. The current DR-312 form says on its face that it is for proceedings commenced before July 1, 2023. So when a closing agent asks for the affidavit today, the right answer depends on the calendar. An older probate, or a legacy title question from one, still gets the recorded affidavit. A probate opened since mid-2023 generally needs a short explanation of the law change instead of a form, and we handle that conversation with the title company when it comes up.

Form 706 vs Form 709 vs Form 1041

Three returns share this corner of the tax world, and families mix them up constantly because all three can show up around a death.

• Form 706 is the estate tax return, a tax on the transfer of what the person owned at death. It is due 9 months after death and, as covered above, applies only over the $15 million line or by choice for portability.
• Form 709 is the gift tax return, filed by a living giver each spring for gifts above the annual exclusion, $19,000 per recipient in 2026. It rarely produces tax; its job is keeping score against the same $15 million lifetime allowance the 706 uses later. After a death, the personal representative may need to file the decedent’s final Form 709 for gifts made in the year of death, and the 706 cannot be prepared accurately without the old 709s in hand.
• Form 1041 is the estate’s income tax return, and it is the one most estates actually file. The estate becomes its own taxpayer at death, and once it earns $600 of income, rent on the house, dividends, interest, gains on anything sold during administration, a 1041 is required. A modest estate that will never see a 706 can easily owe two or three years of 1041s before it closes. It is also separate from the decedent’s final personal income tax return, which still has to be filed for the year of death.

If you are sorting out which of these applies in the first weeks after a loss, our checklist on what to do when a parent dies in Florida puts the tax filings in order alongside everything else.

Penalties and the Personal Representative’s Exposure

For a taxable estate, missing the deadline is expensive in a compounding way. The late-filing penalty runs 5% of the unpaid tax for each month the return is late, up to 25%. The late-payment penalty adds 0.5% per month, up to another 25%, and interest accrues on top of both. Reasonable cause can excuse the penalties; nothing excuses the interest. On an eight-figure estate, a return that sits unfiled for a year while the family argues can cost more than the argument was about.

The sharper edge is personal. The personal representative signs Form 706 under penalties of perjury, and federal law puts the government’s claim ahead of the heirs. A representative who distributes the estate while estate tax remains unpaid can be held personally liable for the shortfall, up to the amount that went out the door. The heirs got the money; the representative gets the bill. This is not a theoretical rule, and it is the reason experienced representatives are slow to write the final checks.

The protection is sequencing, and it is straightforward. Keep a reserve until the IRS confirms the account is closed, by closing letter or by the transcript showing code 421. Before final distributions, a representative can also file a written request for discharge from personal liability (Form 5495 is the vehicle), which starts a clock for the IRS to name the amount due, after which the representative is personally released even if more tax surfaces later. Distributions come last. Families push hard at month ten to see money, and holding the line is part of the job.

How We Work on Form 706 Filings

We treat the 706 as part of the estate, not a bolt-on. In the first conversation we screen the gross estate against the $15 million line, including the assets families forget to count, and we run the portability decision on its own merits, including the honest cases where filing is not worth it. When a return is going in, we coordinate the appraisals, prepare and file the 706 and the Form 4768 extension, handle the Form 8971 statements on their 30-day clock, and see the closing letter or transcript through so the estate can distribute and close. Because we handle the probate itself, the return and the administration move on one calendar instead of two.

The income tax side stays with the right professionals. Your CPA typically prepares the estate’s Form 1041 and the decedent’s final return, and we coordinate with them rather than duplicate them. Estate tax work is quoted at the free 30-minute consult, and our flat-fee probate schedule is posted on our pricing page. You do not need the numbers organized before you call. That is what the consult is for.

Frequently Asked Questions

Common Situations

The filing that looked unnecessary. A Coral Gables widow inherits everything from her husband. The combined estate is around $8 million, nowhere near the line, and no return is required. We file a portability-only 706 inside the 15-month window anyway, with simplified reporting keeping the cost down. Years later the family business sells and her own estate has grown past her exclusion. The banked DSUE absorbs the excess, and a modest filing made at the worst moment of her life turns out to be the most valuable document in the plan.

The fourth-year rescue. A father dies in 2023 and nobody mentions Form 706; the estate was well under the threshold and the probate closed without it. In 2026 his widow’s advisor notices her assets climbing and asks about portability. Because the estate never had a filing obligation, the five-year relief window is still open. A late portability-only return goes in with the required statement on page one, no penalty and nothing owed, and the unused exclusion is preserved with about two years to spare.

The reserve that protected the representative. A personal representative of a taxable estate faces siblings who want distributions at month ten. She has filed the 4768 with a conservative payment, but the appraisal of the family’s commercial building is still moving. She distributes partially, holds a reserve sized to the open tax question, and waits for the account transcript to show code 421 before the final checks. When the IRS adjusts the building’s value modestly, the reserve covers it. Nothing about the adjustment touches her personally, which is the whole point of the sequence.

Sources of Law

• IRC §6018 (who must file); IRC §2010(c) (basic exclusion and the DSUE); Rev. Proc. 2025-32 (2026 figures: $15,000,000 basic exclusion; $19,000 annual gift exclusion; $1,460,000 §2032A ceiling; $1,940,000 §6601(j) 2% portion). IRS 2026 inflation adjustments · Rev. Proc. 2025-32
• Instructions for Form 706 (Rev. 09/2025) (9-month due date; Form 4768 automatic 6-month extension of time to file, not pay; portability election mechanics; alternate valuation §2032; QTIP election on Schedule M; §6166 installment payment on the 35% closely-held-business test; §2032A special-use valuation). irs.gov/instructions/i706
• Rev. Proc. 2022-32 (simplified late portability-only filing up to the fifth anniversary of death for estates with no §6018(a) filing requirement, with the required legend on the return). Rev. Proc. 2022-32
• Instructions for Form 8971 (required only when Form 706 or 706-NA is required under §6018; due the earlier of 30 days after the return’s due date or 30 days after actual filing; Schedule A to each beneficiary; portability-only and protective filings excepted; penalties under §§6721 to 6722). irs.gov/instructions/i8971
• IRS, Frequently asked questions on the estate tax closing letter ($56 Pay.gov user fee effective May 21, 2025, reduced from $67 by T.D. 10038; account transcript transaction code 421 as the no-cost alternative). irs.gov closing letter FAQ
• IRC §6651 (late-filing and late-payment penalties); 31 U.S.C. §3713(b) (fiduciary personal liability for distributions ahead of federal claims); IRC §2002 (executor pays the tax); IRC §2204 (executor’s discharge from personal liability; Form 5495); Instructions for Form 1041 (estate income tax return required at $600 of gross income). irs.gov/instructions/i1041
• Florida: ch. 2023-207, Laws of Florida, amending §§198.26, 198.32, and 733.2121, Fla. Stat. (affidavits no longer required and no lien for post-2004 deaths, for probates commenced on or after July 1, 2023 and pending ones without final discharge); Fla. Dept. of Revenue, TIP 23C03-01 (June 19, 2023); Form DR-312 (R. 01/24) and its instructions (recorded with the clerk of the circuit court where the decedent owned property; never sent to the Department of Revenue; evidence of nonliability removing the estate tax lien). TIP 23C03-01 · floridarevenue.com estate tax (All sources retrieved 2026-08-08.)

Updated on August 8, 2026. Reviewed by Kevin D. Klagge, Esq., Fla. Bar No. 99502. Attorney Kevin Klagge represents families, businesses, and international clients in estate and tax planning, business structuring, and international law, with a focus on Florida legal tools. He litigates estate and business issues in court. This article is general information about federal estate tax procedure and Florida practice, not legal or tax advice, and does not create an attorney-client relationship. Income tax return preparation belongs with your CPA, and we coordinate with them on the estate’s filings. Your result depends on your specific facts. Do not send confidential information until we have agreed to represent you.