Farm Estate Tax Exemption — Every Relief Option Available to Agricultural Estates

A farm that would never sell for development money can still be taxed as though it would. That gap between what the land is actually worth as a working farm and what the IRS considers its "highest and best use" value is where most agricultural families run into trouble — and where the most powerful exemptions apply.

The Federal Exemption Baseline

The 2017 Tax Cuts and Jobs Act raised the federal estate tax exemption to $13.99 million per individual ($27.98 million for a married couple using portability) in 2025. Public Law 119-21 set the 2026 basic exclusion at $15 million per individual; a couple may have up to $30 million in combined exclusion if both full exclusions are available and portability is elected. That shields many farms from federal estate tax.

If the taxable estate exceeds its available exclusion, the graduated federal estate tax rates apply, reaching 40% at the top rate. On a 2,000-acre operation valued at $10,000 per acre, that exposure adds up fast.

Section 2032A: Special Use Valuation

This is the single most valuable federal relief mechanism for qualifying farms. Instead of valuing agricultural land at its hypothetical "highest and best use" — which in growing metro areas might mean commercial development — Section 2032A lets the executor value it based on actual agricultural use.

The formula capitalizes cash rent minus property taxes, divided by the Federal Land Bank loan rate:

Special Use Value = (5-Year Average Gross Cash Rent − Average Real Estate Taxes) ÷ Average Federal Land Bank Interest Rate

The maximum reduction is $1,460,000 for a decedent who dies in 2026 (inflation-adjusted), which translates to significant tax savings at the 40% rate. But the qualification requirements are strict:

• At least 50% of the adjusted gross estate must be farm property (real and personal)
• At least 25% must be qualified agricultural real property
• The decedent or a family member must have materially participated in the operation for 5 of the 8 years before death
• Passive cash renting to non-family tenants disqualifies the election

The 10-year recapture rule means a qualified heir must continue farming and retain ownership for a decade. Selling to a non-family member or converting the land triggers an immediate recapture of the deferred tax plus interest.

Section 6166: Installment Payments

When the farm represents more than 35% of the adjusted gross estate, the executor can defer estate tax payments entirely for the first 5 years (paying only interest), then spread the principal across 10 annual installments. The first portion of tax is charged at just 2% interest, with the remainder at 45% of the standard IRS underpayment rate.

This prevents forced land sales to generate immediate cash for tax payments. Farmland held only as a passive rental is not an active closely held business interest and does not satisfy the 35% threshold by itself.

Stepped-Up Basis

While not technically an exemption, the stepped-up basis eliminates capital gains tax on decades of appreciation. When farmland passes through an estate, the heirs' tax basis resets to fair market value on the date of death.

Land purchased at $100 per acre 40 years ago and worth $10,000 per acre today would normally trigger capital gains on the $9,900 difference if sold. The step-up wipes that out entirely. This is why allowing farmland to transfer at death — rather than gifting it during life (which carries the original cost basis) — often produces better tax outcomes for the heirs.

State-Level Farm Exemptions

Several states offer their own agricultural estate tax relief on top of the federal provisions:

• Oregon provides a Natural Resource Credit calculated using up to $7.5 million of qualifying farm and forestland
• Washington offers Qualified Family-Owned Business Interest (QFOBI) deductions of up to $3.076 million for 2026 deaths
• Iowa repealed its inheritance tax for deaths on or after January 1, 2025
• Nebraska applies lower inheritance tax rates for closer relatives (1% for immediate family vs. 11% for remote relatives)

States with no estate tax (like South Dakota, North Dakota, and Kansas) provide an inherent advantage for farm families, though federal liability still applies.

How to Claim These Exemptions

Form 706 is generally due nine months after death, and Form 4768 can extend the filing deadline by six months. An estate must file if it meets the filing threshold; an executor may also file to elect portability. A Section 6166 election generally must be made on a timely filed return, including a valid extension. A Section 2032A election may be made on a late-filed Form 706 if it is the first return filed.

For portability of the deceased spouse's unused exemption, Form 706 must be filed even if no tax is owed. This preserves the unused exemption amount for the surviving spouse's own estate.

Working with a CPA who understands agricultural valuations and an attorney experienced in farm estate tax elections is essential. The material participation documentation alone — proving active involvement over 5 of the prior 8 years — requires careful assembly of tax returns, farm records, and operational evidence.

The Farm Estate Settlement Guide includes a Section 2032A eligibility worksheet and a document retrieval checklist that walks you through exactly what records to gather for these elections.