IRS Form 706 Schedule U Guide: Conservation Easement Rules

1. Introduction – What is Form 706 (Schedule U)?

IRS Form 706 (Schedule U), officially titled Schedule U – Qualified Conservation Easement Exclusion, is an official supporting schedule attached to IRS Form 706 (United States Estate Tax Return). Governed by the Internal Revenue Service (IRS), it allows estate executors to claim a specialized federal estate tax exclusion for land subject to a qualified conservation easement.

A conservation easement is a legally binding deed restriction that permanently limits real estate development to protect environmental habitats, open space, scenic views, or historical land features. Under Section 2031(c) of the Internal Revenue Code, land burdened by a conservation easement qualifies for significant federal estate tax benefits.

Schedule U provides the mathematical calculation worksheet used to exclude up to **40% of the value of land** encumbered by a conservation easement from the gross estate, subject to a statutory maximum exclusion limit of **$500,000**.

2. Purpose of the Form

The primary purpose of Schedule U is to encourage private landowners and farming families to permanently preserve open space and ecological habitats by providing federal estate tax relief.

Schedule U solves a major financial crisis for land-rich families. Large family farms, ranches, and undeveloped coastal properties often appreciate significantly in real estate market value. Upon the owner’s death, heirs were historically forced to sell or subdivide the land to pay heavy estate tax bills. Schedule U provides double tax relief: first, the easement reduces the land’s Fair Market Value; second, Schedule U allows an extra tax exclusion of up to $500,000.

Additionally, Schedule U incorporates rules for **post-mortem conservation easements**. If a landowner dies without executing an easement during life, Section 2031(c)(8)(C) allows the estate executor or family members to grant a qualified conservation easement after death and still claim the Schedule U exclusion.

3. Who Needs to File This Form

Schedule U is completed and attached to Form 706 by an estate executor who elects to claim the Section 2031(c) conservation easement exclusion for qualifying real estate.

An estate executor can file Schedule U if the land and easement satisfy all of the following statutory requirements:

• U.S. Land Location: The real property is situated in the United States or its possessions.
• 3-Year Ownership Test: The land was owned by the decedent or a member of the decedent’s family for at least 3 years prior to the date of death.
• Qualified Conservation Contribution: The easement meets Section 170(h) standards and was granted to a qualified 501(c)(3) land trust or government entity.
• Timely Election: The executor formally makes the Section 2031(c) election on a timely filed Schedule U. Once made, the election is **irrevocable**.

4. Who Is Exempt / Not Required to File

Schedule U is an optional tax incentive schedule. Many estates containing real estate do not file Schedule U.

An estate is NOT required to file Schedule U in the following situations:

• No Conservation Easement: Estates where real estate is unencumbered by a permanent conservation easement granted to a qualified land trust.
• Commercial Real Estate Development: Properties held strictly for commercial, residential, or industrial construction without conservation restrictions.
• Non-Taxable Estates: Estates that owe zero federal estate tax due to the federal basic exclusion threshold or unlimited marital deduction do not require Schedule U exclusions.
• Unfavorable Income Tax Cost Basis Trade-off: Executors who choose not to elect Schedule U because claiming the exclusion reduces the stepped-up cost basis for heirs.

5. When to File

Schedule U is an integrated schedule attached directly to Form 706 and shares its exact federal filing deadline.

Review the primary submission timing deadlines:

• Nine-Month Due Date: Schedule U must be submitted attached to Form 706 within 9 months of the decedent’s date of death.
• Six-Month Extension: If the executor files Form 4768 to request an automatic 6-month extension, Schedule U is submitted when the extended Form 706 is filed (15 months from the date of death).
• Post-Mortem Easement Recording Deadline: If a conservation easement is granted *after* the decedent’s death, the easement deed must be executed and recorded in county land records **on or before the date Form 706 is filed**.

6. Where and How to File

Schedule U is attached directly behind Schedule T in alphabetical schedule order on Form 706. It is filed by paper mail as part of the complete estate tax return package.

Mail the complete Form 706 package—including Schedule U, recorded conservation easement deeds, qualified appraisal reports, and land trust determination letters—to the designated IRS submission center address listed in the official Form 706 instructions (typically the IRS Center in Kansas City, MO).

7. Step-by-Step Instructions to Fill the Form

Schedule U requires calculating land values, subtracting retained development rights, and computing the “applicable percentage.” Review the step-by-step breakdown below.

Schedule U Line	Line Item Title	Required Calculation or Disclosure
Line 1	Gross Land Value	Enter date-of-death Fair Market Value of land subject to easement (from Schedule A, E, or G).
Line 2	Easement Value	Enter Fair Market Value of the conservation easement contribution.
Line 3	Net Land Value	Subtract Line 2 from Line 1.
Line 4	Retained Development Rights	Enter value of retained commercial development rights (unless extinguished by agreement).
Lines 5–7	Mortgages & Net Exclusion Base	Subtract retained development rights and acquisition mortgages to determine net land value.
Lines 8–11	Applicable Percentage Calculation	Calculate ratio of easement to land value; apply 40% maximum rate (or reduced percentage).
Line 12–13	Allowable Exclusion	Multiply percentage by net land value; cap final exclusion at the statutory **$500,000 maximum**.

Understanding the “Applicable Percentage” Rule

The maximum statutory exclusion percentage is **40%**. However, under Section 2031(c)(2), if the value of the conservation easement is less than 30% of the total land value, the 40% rate is reduced by 2 percentage points for every 1% the easement value falls below 30%.

Retained Development Rights and Extinguishment Agreements

If the easement permits retained commercial or residential development rights (Line 4), that development value must be subtracted from the exclusion base. However, if all heirs execute a legally binding agreement on Line 14 to **extinguish all retained development rights** prior to filing Form 706, Line 4 becomes zero, maximizing the exclusion.

Total Line (Line 13)

Calculate the exclusion amount and cap it at $500,000. Carry this final allowable sum over to **Form 706, Part 5 (Recapitulation), Line 11**.

8. Required Documents/Information Needed Before Filling

Substantiating a conservation easement exclusion on Schedule U requires rigorous appraisal and legal documentation.

Ensure you have the following verification materials ready:

• Recorded Conservation Easement Deed: Certified copy of the recorded easement deed displaying county clerk recording stamps.
• Qualified Appraisals: Independent appraisal reports prepared by certified real estate appraisers establishing land values “before” and “after” the easement.
• Land Trust Qualification Proof: IRS 501(c)(3) determination letter and Section 170(h) status proof for the recipient conservation organization.
• Title Records (3-Year Rule): Historical real estate deeds proving the decedent or family members held title for at least 3 years before death.
• Signed Extinguishment Agreements: Executed agreements from heirs extinguishing retained development rights (if applicable).

9. Common Mistakes to Avoid

Errors on Schedule U can lead to disallowed exclusions or unexpected capital gains taxes for heirs. Avoid these major pitfalls:

• Exceeding the $500,000 Statutory Cap: Attempting to claim an exclusion exceeding the federal statutory limit of $500,000.
• Ignoring the Income Tax Cost Basis Impact: Claiming the Schedule U exclusion without recognizing that the excluded portion of land **does not receive a stepped-up cost basis** under Section 1014(a)(4). Heirs inherit the decedent’s low carryover basis for the excluded percentage, increasing future capital gains tax when sold.
• Ignoring Retained Development Rights: Failing to subtract the value of retained commercial building rights on Line 4, or failing to have heirs sign the extinguishment agreement.
• Recording Post-Mortem Easements Late: Granting a post-mortem conservation easement after death but failing to record the deed before filing Form 706.
• Using Unqualified Appraisers: Relying on uncertified appraisals that fail to meet strict IRS Section 170(h) appraisal standards.

10. Penalties for Non-Filing or Errors

Disallowing a claimed conservation exclusion on Schedule U increases the taxable estate, triggering immediate IRS tax enforcement.

Key penalty risks include:

• Disallowance of Exclusion: The IRS will completely disallow non-compliant conservation claims, generating immediate estate tax deficiency bills.
• Valuation Understatement Penalty (IRC Section 6662(g)): A 20% to 40% penalty applies if the easement value is grossly overstated or land value is understated.
• Compounding Interest: Unpaid estate tax caused by disallowed Schedule U claims incurs mandatory compounding interest from the original 9-month filing due date.

11. Related Forms or Schedules

Schedule U operates in direct coordination with several core Form 706 schedules and charitable forms:

• Form 706: United States Estate (and Generation-Skipping Transfer) Tax Return.
• Form 706 (Schedule A): Real Estate.
• Form 706 (Schedule G): Transfers During Decedent’s Life (for trust-held land).
• Form 8283: Noncash Charitable Contributions.
• Form 8971: Information Regarding Beneficiaries Acquiring Property From a Decedent.

12. Frequently Asked Questions

1. What is IRS Form 706 Schedule U?

IRS Form 706 Schedule U is the supporting schedule used by estate executors to calculate and claim an estate tax exclusion of up to $500,000 for land subject to a qualified conservation easement.

2. How much estate tax value can be excluded under Schedule U?

Schedule U allows an exclusion of up to 40% of the net land value subject to the easement, capped at a maximum federal statutory limit of $500,000.

3. Can a conservation easement be created after the decedent dies?

Yes. Under Section 2031(c)(8)(C), an executor or family members can execute a post-mortem conservation easement after death, provided the easement deed is recorded before Form 706 is filed.

4. What are “retained development rights” on Schedule U?

Retained development rights are commercial or residential building rights kept by the landowner. Their value reduces the allowable exclusion unless heirs sign an agreement extinguishing those rights.

5. How does Schedule U affect the heirs’ income tax cost basis?

Under Section 1014(a)(4), the portion of land excluded from estate tax under Schedule U carries over the decedent’s historical cost basis rather than receiving a stepped-up Fair Market Value basis.

6. What land qualifies for the Schedule U exclusion?

Land located in the U.S. or its possessions that was owned by the decedent or a family member for at least 3 years prior to death and is burdened by a qualifying permanent conservation easement under Section 170(h).

13. Conclusion

IRS Form 706 (Schedule U) is a powerful tool for preserving open space and protecting family lands from forced estate tax liquidations. By pairing real estate valuation discounts with an additional $500,000 tax exclusion, executors achieve significant estate tax savings.

To prepare an accurate Schedule U, secure qualified “before and after” appraisals, review 3-year title history, address retained development rights, evaluate carryover basis consequences for heirs, and file Schedule U with Form 706 on time.