Form 706
The federal estate tax return filed for a U.S. citizen or resident decedent whose gross estate exceeds the basic exclusion amount (adjusted by lifetime taxable gifts) — and for portability elections by smaller estates. The 706 is a substantial document; assembly, valuation, and timing are the principal tasks.
What is reported
The gross estate, deductions, taxable estate, prior taxable gifts, computation of estate tax, and elections (portability, alternate valuation, §6166, special-use valuation, GST allocation).
Who must report
Executor of the estate of a decedent with:
- Gross estate (plus adjusted taxable gifts) exceeding the basic exclusion amount at death; or
- Smaller estate making a portability election under §2010(c)(5)(A) to transfer unused exclusion to surviving spouse; or
- Estate of a nonresident not a citizen with U.S.-situs assets above $60,000 (filed on Form 706-NA).
Thresholds
For 2026: the basic exclusion amount under §2010(c)(3) is indexed; the prior doubled-amount baseline applies absent legislation overriding the scheduled end-of-2025 sunset. See estate tax.
The form
Form 706, United States Estate (and Generation-Skipping Transfer) Tax Return. Due nine months after date of death (§6075(a)); automatic six-month extension on Form 4768. Filed to IRS in Cincinnati.
Penalties
- Failure to file: 5% per month of unpaid tax, capped at 25%.
- Failure to pay: 0.5% per month of unpaid tax.
- Accuracy: 20% on substantial valuation understatement; 40% on gross misstatement.
- Late payment interest under §6601.
Relief procedures
- §6161 hardship extension of payment up to 12 months.
- §6166 installment payment up to 14 years for qualifying closely held business interests.
- Rev. Proc. 2022-32 extension to file portability-only Form 706 within five years of death.
Recent guidance
Rev. Proc. 2022-32 substantially extended the time to file portability-only returns (from two years to five years), reflecting practitioner demand and acknowledging the administrative cost of late awareness of unused exclusion.
The IRS Estate and Gift Tax Examination program prioritizes high-value estates with substantial valuation discount claims, large concentrated stock positions, and complex family-entity holdings.
Filing-mechanic considerations for luxury-asset estates
- Schedule F — Other Miscellaneous Property — captures art, jewelry, collectibles, vehicles, vessels.
- Schedule G — Transfers During Decedent's Life — captures §2036 and §2038 inclusions.
- Schedule M — Marital Deduction Property — and Schedule O — Charitable Bequests.
- Schedule R — GST tax.
- Form 706, Part 6 — Portability election.
- Form 706, Part 3, line 4 — §6166 election.
- Qualified appraisals attached for substantial-value property.
Primary Sources
- 26 U.S.C. §§6018, 6075 (estate-tax filing requirements).
- 26 U.S.C. §2010 (basic exclusion); §2010(c) (portability).
- 26 U.S.C. §6166 (installment payment).
- Rev. Proc. 2022-32 (portability extension to five years).
- Treas. Reg. §20.2010-3 (portability mechanics).
- IRS Form 706 and instructions — irs.gov/forms-pubs/about-form-706.
Reviewed May 2026