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- The estate tax exemption shields transfers, not particular assets
- What belongs in the gross estate
- From gross estate to taxable estate
- Lifetime gifts use the same unified system
- Portability can preserve unused exclusion for a spouse
- When Form 706 enters the process
- The exemption does not determine inherited-property basis
- Federal and state death taxes are separate
- Sources
Key Facts
- Federal level: The federal estate tax exemption, technically the basic exclusion amount, is $15,000,000 for a person who dies in 2026.
- Federal level: The exemption applies through a unified credit, so taxable lifetime gifts can reduce the exclusion remaining at death.
- Federal level: The gross estate can include probate and non-probate assets, while allowable deductions help determine the taxable estate.
- Federal level: Estate value above the exemption is not automatically the tax bill; the return applies deductions, prior-gift rules, credits, and graduated rates reaching 40%.
- Federal level: Portability can add a deceased spouse’s unused exclusion to a surviving spouse’s exclusion, but the deceased spouse’s estate generally must elect it on Form 706.
- State level: A state estate or inheritance tax is separate from the federal estate tax and can apply under a different threshold or structure.
The estate tax exemption shields transfers, not particular assets
The federal estate tax is a tax on transfers at death, not a tax that beneficiaries ordinarily pay merely because they inherit property. The term “estate tax exemption” is widely used, although the Internal Revenue Code calls the central figure the basic exclusion amount. Section 2010 converts the applicable exclusion amount into a credit against the estate tax.
For people who die in 2026, the basic exclusion amount is $15 million. The statute provides inflation adjustments for years after 2026, so the controlling number depends on the year of death. The 2025 amount was $13.99 million.
The exclusion is measured per individual, but it is not simply a coupon applied to one house, account, or business. The calculation considers the federal transfer-tax system as a whole, including certain taxable gifts made during life and property included in the estate at death.
What belongs in the gross estate
The starting point is the gross estate: the fair market value of property the decedent owned or in which the decedent held certain interests at death. It may include cash, securities, real estate, business interests, retirement assets, annuities, life insurance proceeds, and trust property when the federal inclusion rules apply. Property can be part of the gross estate even when it passes outside probate.
That last distinction prevents a common misunderstanding. A beneficiary designation, joint title, payable-on-death instruction, or trust may change how an asset is transferred under state law, but it does not automatically remove the asset from the federal gross estate. Ownership, retained rights, transfer history, and statutory inclusion rules matter.
Fair market value generally means the price at which property would change hands between a willing buyer and seller who are informed and under no compulsion to transact. It is not necessarily the original purchase price, insured value, assessed value, or balance shown on an old statement. Closely held businesses, real property, art, and fractional interests may require specialized valuation evidence.
From gross estate to taxable estate
The gross estate is not the same as the taxable estate. Federal law permits deductions when their requirements are met. Common categories include qualifying transfers to a surviving spouse, qualifying charitable transfers, enforceable debts, administration expenses, and certain losses.
A simplified illustration shows the sequence. Suppose a 2026 gross estate is valued at $18 million and valid deductions total $2 million. The tentative taxable estate would be $16 million before accounting for adjusted taxable gifts and the remaining applicable exclusion.
This does not mean that $16 million is taxed at 40%, or that the tax equals the amount above $15 million multiplied mechanically by 40%. Form 706 uses the unified rate schedule, accounts for specified lifetime gifts and prior gift tax, and then applies available credits. The highest marginal federal estate-tax rate is 40%, but lower brackets remain part of the statutory computation.
Lifetime gifts use the same unified system
Federal gift and estate taxes are linked. A taxable gift can use part of the donor’s basic exclusion during life, leaving less exclusion available at death. The fact that no gift tax was paid when Form 709 was filed does not necessarily mean the gift had no effect on the later estate-tax calculation.
The annual gift-tax exclusion is a separate concept. Qualifying gifts within that annual amount generally do not consume lifetime exclusion, while gifts above it may be taxable gifts reported on Form 709. Other exclusions or deductions, including qualifying tuition, medical, marital, and charitable transfers, can operate under their own rules.
Completed lifetime gifts are generally no longer owned at death and therefore are not simply added back as gross-estate property. Adjusted taxable gifts nevertheless enter the estate-tax computation. Some transfers with retained control or interests can also be included in the gross estate under separate provisions.
Portability can preserve unused exclusion for a spouse
The applicable exclusion amount can include the deceased spousal unused exclusion, commonly shortened to DSUE. Portability allows a surviving spouse to use exclusion left unused by the last deceased spouse. It does not happen merely because the couple was married.
The deceased spouse’s executor generally elects portability by filing a complete and timely Form 706. The ordinary due date is nine months after death, and an automatic six-month filing extension may be requested on Form 4768. An extension to file does not automatically extend the time to pay estate tax.
Some estates below the normal filing threshold may qualify for the simplified late-portability procedure in Revenue Procedure 2022-32. That procedure can extend the filing window to the fifth anniversary of death when its conditions are satisfied. It does not replace the ordinary timely-filing rule for estates otherwise required to file Form 706.
Portability also has boundaries. It concerns the federal estate and gift tax exclusion, not the generation-skipping transfer exemption. Rules for a noncitizen surviving spouse and qualified domestic trusts can differ.
When Form 706 enters the process
An executor uses Form 706 to calculate federal estate tax under Chapter 11 and, when applicable, generation-skipping transfer tax on direct skips. A filing requirement generally depends on the gross estate plus adjusted taxable gifts and specified prior exemption amounts, not merely the probate estate or net cash available.
Form 706 gathers asset values, ownership details, lifetime-transfer information, deductions, elections, and tax calculations. Supporting records can include the death certificate, governing instruments, appraisals, prior gift-tax returns, and documentation for unusual or partly included assets. The form is detailed because the federal estate-tax base crosses property, valuation, gift, trust, and family-transfer rules.
An estate below the tax threshold may still file Form 706 to elect portability. Filing a return and owing estate tax are therefore different questions. An estate can have a filing reason without a tax balance, while another estate can require both filing and payment.
The exemption does not determine inherited-property basis
Estate tax and income-tax basis are related to death but answer different questions. The estate tax measures taxable transfers. Basis helps determine a beneficiary’s later gain or loss when inherited property is sold.
Inherited property generally receives a basis tied to fair market value at death, or to the alternate valuation date when a valid election applies. Special valuation rules and exceptions can produce a different basis. Whether the estate owed federal estate tax is not the sole test for the beneficiary’s basis.
This distinction matters because an estate can fall entirely below the estate tax exemption while inherited appreciated property still receives a new basis under federal income-tax law. Conversely, income in respect of a decedent and certain recently gifted appreciated property can follow special rules rather than the usual date-of-death basis.
Federal and state death taxes are separate
The $15 million figure is the 2026 federal basic exclusion amount. It does not establish a state estate-tax threshold and does not answer whether a state imposes an inheritance tax on a beneficiary. State rules can use different exemptions, rates, deductions, relationship categories, filing dates, and residency or property-location tests.
Probate administration is also primarily governed by state law. A federal estate-tax return does not substitute for a probate inventory, state fiduciary filing, state death-tax return, or the estate’s own federal income-tax return. Each system has a different tax base and purpose.
The guide to how the federal estate tax works provides related background. The applicable rules remain tied to the date of death, prior gifts, asset ownership, family circumstances, and the governing jurisdictions.
