Estate Tax Complete Guide: Exemptions, Rates, Strategies, and Key Rules

What Is Estate Tax?

An estate tax is levied on the total value of a deceased person’s assets before those assets are distributed to heirs (spouse, children, and other beneficiaries). The United States uses an estate tax model — the entire taxable estate is assessed before distribution — as opposed to an inheritance tax model (used in some US states and countries like the UK) where each heir is taxed on what they individually receive.

Estate taxes serve as a complement to the income tax system. They capture wealth that was never taxed as income and help prevent extreme intergenerational concentration of wealth, contributing to fiscal equity.

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1. Key Federal Estate Tax Figures (2024)

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2. Federal Estate Tax Rates

Rate Structure (2024)

Taxable Estate Above Exemption	Rate
$0 –$10,000	18%
$10,001 –$20,000	20%
$20,001 –$40,000	22%
$40,001 –$60,000	24%
$60,001 –$80,000	26%
$80,001 –$100,000	28%
$100,001 –$150,000	30%
$150,001 –$250,000	32%
$250,001 –$500,000	34%
$500,001 –$750,000	37%
$750,001 –$1,000,000	39%
Over $1,000,000	40%

How the Tax Is Calculated

Gross Estate (fair market value of all assets)
  + Taxable Gifts Made During Life (past 3 years for certain transfers)
  − Allowable Deductions:
      Marital deduction (unlimited for citizen spouses)
      Charitable deduction (unlimited for qualifying charities)
      Debts, mortgages, funeral expenses
= Taxable Estate
  − Unified Credit ($13.61M exemption equivalent, 2024)
= Amount Subject to Tax
  × Applicable Rate (up to 40%)
= Tentative Estate Tax
  − Credits (state death tax credit, etc.)
= Net Federal Estate Tax Due

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3. Key Deductions and Exemptions

Marital Deduction vs Portability

The most powerful tool for married couples is the unlimited marital deduction — assets passing to a US citizen spouse are entirely exempt from estate tax. Additionally, portability (introduced in 2010) allows the executor to transfer any unused exemption from the first spouse’s estate to the surviving spouse.

Provision	Amount	Notes
Unlimited marital deduction	Unlimited	US citizen spouse only; QDOT trust required for non-citizen spouses
Portability election	Up to $13.61M	Executor must file Form 706 to elect portability even if no tax is due
Annual gift exclusion	$18,000/recipient	Inflation-adjusted; 2024 figure
Medical & educational exclusion	Unlimited	Payments made directly to provider; no gift tax

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4. Estate Tax vs Lifetime Gifting Strategy

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5. Real Calculation Example

Scenario: Taxable estate of $15 million (surviving spouse, two adult children)

1. Gross taxable estate: $15,000,000
2. Deductions:
   • Marital deduction: $5,000,000 (portion left to spouse)
   • Funeral and debt deductions: $200,000
   • Subtotal deductions: $5,200,000
3. Adjusted taxable estate: $9,800,000
4. Unified credit / exemption equivalent: $13,610,000
5. Amount subject to tax: $0 (estate is below the exemption after deductions)
6. Federal estate tax owed: $0

For estates exceeding the $13.61M threshold (e.g.,$20M estate with $3M above exemption), the excess is taxed at rates graduating up to 40%.

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6. State-Level Estate and Inheritance Taxes

Twelve US states and the District of Columbia impose their own estate taxes, often with much lower exemptions than the federal level. Six states (Iowa, Kentucky, Maryland, Nebraska, New Jersey, Pennsylvania) levy an inheritance tax on recipients.

State	Estate Tax Exemption	Top Rate
Massachusetts	$2,000,000	16%
Oregon	$1,000,000	16%
Washington	$2,193,000	20%
New York	$6,940,000	16%
Maryland	$5,000,000	16% (+ inheritance tax)
Federal	$13,610,000	40%

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7. Estate Planning Timeline

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8. Legal Tax Minimization Strategies

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Key Legal References

IRC § 2001 — Imposition of Tax

The tax imposed by this chapter shall apply to the transfer of the taxable estate of every decedent who is a citizen or resident of the United States.

Source: Internal Revenue Code, Title 26, Subtitle B, Chapter 11

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IRC § 2010 — Unified Credit

In the case of a citizen or resident of the United States, there shall be allowed as a credit against the tax imposed by section 2001 an amount equal to the applicable credit amount. For 2024, the basic exclusion amount is $13,610,000.

Source: Internal Revenue Code § 2010

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IRC § 2056 — Marital Deduction

For purposes of the tax imposed by section 2001, the value of the taxable estate shall, except as limited by subsection (b), be determined by deducting from the value of the gross estate an amount equal to the value of any interest in property which passes or has passed from the decedent to his surviving spouse.

Source: Internal Revenue Code § 2056

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References

• IRS Estate Tax Guide: https://www.irs.gov/businesses/small-businesses-self-employed/estate-tax
• IRS Form 706: https://www.irs.gov/forms-pubs/about-form-706
• ACTEC — American College of Trust and Estate Counsel: https://www.actec.org
• OECD Inheritance Taxation Report: https://www.oecd.org/tax/inheritance-taxation
• Wikipedia — Estate Tax in the United States: https://en.wikipedia.org/wiki/Estate_tax_in_the_United_States