Estate and Gift Tax: Federal Rules and Thresholds
The federal estate and gift tax system imposes transfer taxes on wealth passed between individuals, either at death or during life. Administered by the Internal Revenue Service under authority granted by the Internal Revenue Code, these taxes operate through a unified framework that links lifetime gifting to estate settlement. Understanding the applicable thresholds, exclusions, and filing triggers is essential for executors, trustees, beneficiaries, and anyone engaged in multi-generational wealth planning.
Definition and scope
The federal estate tax is a tax on the right to transfer property at death (IRC §§ 2001–2210). The federal gift tax applies to transfers of property made during a donor's lifetime without receiving full fair-market-value consideration in return (IRC §§ 2501–2524). Both taxes are administered by the IRS and are structurally unified through a single lifetime exemption — the unified credit — that applies cumulatively across taxable gifts made during life and the taxable estate at death.
A third related transfer tax — the Generation-Skipping Transfer (GST) tax — applies when assets pass to beneficiaries two or more generations below the transferor (e.g., grandchildren), as defined under IRC §§ 2601–2663. The GST tax rate mirrors the top estate tax rate and carries its own exemption, which is indexed to the unified credit amount.
The scope of the estate tax covers the gross estate: all property in which the decedent held an interest at death, including real property, financial accounts, business interests, life insurance proceeds (where the decedent held incidents of ownership), and certain jointly held assets. Deductions reduce the gross estate to the taxable estate, which is then reduced further by the applicable unified credit before any tax liability is calculated.
For context on how these rules interact with broader federal tax structure, see the US Federal Tax System Overview.
How it works
The unified credit and basic exclusion amount
The estate and gift tax system operates through a single basic exclusion amount (BEA), which is the dollar threshold shielded from tax by the unified credit. Under the Tax Cuts and Jobs Act of 2017 (Pub. L. 115-97), the BEA was temporarily doubled; for 2024, the IRS set the BEA at $13.61 million per individual (IRS Revenue Procedure 2023-34). Married couples can combine exemptions through portability, allowing a surviving spouse to use a deceased spouse's unused exemption (DSUE), potentially sheltering up to $27.22 million from tax as of 2024.
Without legislative action, the doubled BEA is scheduled to revert to pre-2018 levels (inflation-adjusted) after December 31, 2025 (IRS Notice 2018-92).
Annual gift tax exclusion
Separate from the lifetime exemption, the annual gift tax exclusion allows a donor to give up to $18,000 per recipient per year in 2024 without reducing the lifetime exemption or triggering a gift tax return (IRS Rev. Proc. 2023-34). This exclusion is indexed for inflation in $1,000 increments. Married donors can gift-split, treating a gift as made equally by both spouses, effectively doubling the annual exclusion to $36,000 per recipient.
Filing requirements
The process for compliance involves discrete steps:
- Form 706 (United States Estate and Generation-Skipping Transfer Tax Return) — filed by the executor when a decedent's gross estate plus adjusted taxable gifts exceeds the filing threshold. The return is due 9 months after the date of death, with a 6-month extension available (IRS Form 706 Instructions).
- Form 709 (United States Gift and Generation-Skipping Transfer Tax Return) — filed annually by any donor who makes gifts exceeding the annual exclusion, makes gifts of future interests, or elects gift-splitting. The due date aligns with the individual income tax return deadline (IRS Form 709 Instructions).
- Portability election — must be made on a timely filed (or extended) Form 706, even when no estate tax is owed. Failure to file forfeits the DSUE for the surviving spouse.
The top marginal estate and gift tax rate is 40%, applied to the value of transfers exceeding the applicable exemption (IRC § 2001(c)).
For related filing mechanics, see Individual Income Tax Filing Requirements and the Tax Calendar and Key Deadlines.
Common scenarios
Scenario 1 — Large estate with portability: A decedent dies in 2024 with a gross estate of $18 million. The executor files Form 706, claims the $13.61 million exemption, and elects portability. The taxable estate of approximately $4.39 million is subject to 40% tax. The surviving spouse's estate may later use the DSUE.
Scenario 2 — Annual exclusion gifting program: A grandparent with 4 grandchildren gives each $18,000 per year. Total annual transfers of $72,000 generate no gift tax liability, require no Form 709 filing, and do not erode the lifetime exemption.
Scenario 3 — Irrevocable life insurance trust (ILIT): Life insurance proceeds paid to a trust rather than directly to the insured's estate are generally excluded from the gross estate if the insured held no incidents of ownership in the policy at death and the transfer occurred more than 3 years before death (IRC § 2042).
Scenario 4 — Generation-skipping transfer: A grandparent bequeaths $5 million directly to a grandchild. The transfer is subject to both estate tax and GST tax. The GST exemption (equal to the BEA, at $13.61 million in 2024) can offset the GST tax if allocated properly on Form 706.
These transfers intersect with rules governing Capital Gains Tax Rules when inherited assets are later sold, particularly through the stepped-up basis provision under IRC § 1014.
Decision boundaries
Distinguishing between taxable and non-taxable transfers requires applying several classification rules:
Estate tax vs. gift tax — timing defines the tax:
- Transfers at death → governed by estate tax rules (Form 706)
- Transfers during life → governed by gift tax rules (Form 709)
- Both draw from the same lifetime exemption pool
Taxable vs. excluded gifts:
| Transfer Type | Taxable? | Notes |
|---|---|---|
| Gift ≤ $18,000/recipient (2024) | No | Annual exclusion applies |
| Gift of future interest | Yes | Annual exclusion does not apply |
| Tuition paid directly to institution | No | Qualified educational exclusion under IRC § 2503(e) |
| Medical payments paid directly to provider | No | Qualified medical exclusion under IRC § 2503(e) |
| Transfers to US citizen spouses | No | Unlimited marital deduction, IRC § 2523 |
| Transfers to non-citizen spouses | Partially | Limited annual exclusion ($185,000 in 2024, per IRS Rev. Proc. 2023-34) |
Estate tax deductions — what reduces taxable estate:
1. Unlimited marital deduction (transfers to surviving US citizen spouse, IRC § 2056)
2. Charitable deduction (transfers to qualifying organizations, IRC § 2055) — explored further in Charitable Contribution Deductions
3. Debts and mortgages of the decedent
4. Administrative expenses of the estate
5. Losses during estate administration
Sunset risk: The TCJA's doubled BEA expires after 2025 unless Congress acts. The IRS confirmed in Treasury Reg. § 20.2010-1(c) that estates will not be clawed back for gifts made under the higher exemption if the exemption later decreases — a critical planning boundary.
Understanding how estate tax interacts with Retirement Account Tax Treatment is particularly relevant for large IRA or qualified plan balances, which are included in the gross estate but do not receive a stepped-up income tax basis.
References
- [IRS — Estate and Gift Taxes](https://www.irs.gov/businesses/small-businesses-self-employed/estate-and-gift-