IRS Rules on Conservation Easements: Deductions, Caps, and Appraisal

The federal conservation easement tax deduction lets you claim a charitable contribution equal to the drop in your property’s fair market value caused by permanently restricting how the land can be developed. The deduction is capped each year at a percentage of your adjusted gross income, with a 15-year carryforward for any excess. To claim it, the donation has to meet a strict set of Internal Revenue Code requirements on perpetuity, valuation, documentation, and who receives the easement, and the IRS audits these deductions aggressively.

What Has to Be True for the Donation to Qualify

The tax code treats a conservation easement as a deductible charitable contribution only if three things line up at once: you donate a qualified real property interest, you donate it to a qualified organization, and the donation is made exclusively for conservation purposes protected in perpetuity.¹ Miss any one, and the deduction disappears entirely.

The “qualified real property interest” is a permanent restriction on the use of the property. It has to bind every future owner forever. A restriction that expires, or one the landowner can revoke, does not qualify.²

The recipient has to be either a government body or a public charity, typically a land trust, that is committed to enforcing the restrictions. Private foundations and for-profit entities do not qualify as donees.

The donation must also serve one of four recognized conservation purposes:

Preserving land for outdoor recreation by, or education of, the general public.
Protecting a relatively natural habitat for fish, wildlife, plants, or a similar ecosystem.
Preserving open space, including farmland, forest, or scenic areas, either for public enjoyment or under a clearly defined government conservation policy, and yielding a significant public benefit.
Preserving a historically important land area or a certified historic structure.

The IRS reads these four categories narrowly. A general claim that the land has “ecological value” without fitting one of them will not hold up under audit.

How Much You Can Deduct

Your deduction equals the property’s fair market value immediately before the easement minus its fair market value immediately after. Appraisers call this the “before and after” method. The “before” value assumes the highest and best use of the unrestricted land; the “after” value reflects what can still be done with it under the restrictions.¹

Most disputes come down to that “before” figure. If your appraiser assumes the land could support a 200-lot subdivision, the IRS will look hard at whether zoning, topography, wetland rules, and actual market demand back that up. Overstating development potential in the “before” value is the single most common reason the IRS reduces or eliminates a claimed deduction. In multiple 2025 Tax Court cases, judges cut claimed deductions by 80% or more after finding appraisers had assumed development scenarios the land could not realistically support.

AGI Caps and the 15-Year Carryforward

Even a legitimate deduction is limited each year by your adjusted gross income. For most individual donors, the deduction cannot exceed 50% of your AGI (technically your “contribution base,” which for most people is the same thing) in any single year.² If the easement is worth more than that cap allows, you carry the unused portion forward for up to 15 additional tax years, applying the same 50% annual limit each year.³

Qualified farmers and ranchers get a better rate: up to 100% of AGI in the contribution year, with the same 15-year carryforward.² To qualify, farming or ranching must be a substantial part of your livelihood, and the easement has to restrict the property to agricultural use. That higher ceiling makes easements especially valuable to working farm and ranch families whose land value dwarfs their annual income.

The Paperwork That Makes or Breaks the Deduction

Several requirements have nothing to do with how conservation-worthy your land is, and they still routinely wipe out otherwise-valid deductions.

Mortgage Subordination

If any mortgage encumbers the property, the lender has to formally subordinate its interest to the donee’s right to enforce the conservation restrictions. The regulation is blunt: no deduction is allowed for property subject to a mortgage unless the mortgagee subordinates its rights.¹ Without subordination, a foreclosure could wipe out the easement, which breaks perpetuity. Get the subordination agreement signed and recorded before the donation date, not after.

Baseline Documentation

The donee organization must have on file a detailed record of the property’s condition at the time of donation. That baseline report typically includes maps, photographs, soil descriptions, species inventories, and descriptions of existing structures and uses. It gives the donee something objective to measure future violations against. Without it, the IRS can argue the conservation purpose lacks the perpetual protection the statute requires.

Qualified Appraisal

Because easements are noncash contributions almost always valued above $5,000, you need a qualified appraisal from a qualified appraiser. The appraisal must follow the Uniform Standards of Professional Appraisal Practice (USPAP), and the appraiser must sign and date it no earlier than 60 days before the donation. You must receive the completed appraisal before the due date, including extensions, of the return on which you first claim the deduction.⁴ The appraiser cannot be the donor, the donee, or a party to the transaction.

Contemporaneous Written Acknowledgment

The donee has to give you a written acknowledgment confirming the contribution, describing the donated property, and stating whether you received any goods or services in return (with a good-faith estimate of their value). You need this document by whichever comes first: the day you file your return for the contribution year, or the return’s due date including extensions.² Miss it, and the deduction is disallowed no matter how solid the easement is.

Form 8283

Attach IRS Form 8283 (Noncash Charitable Contributions) to the return for the donation year, completing Section B, Part I. The appraiser signs Part IV, certifying qualifications and appraisal standards; the donee signs Part V, acknowledging receipt.⁴ File Form 8283 again in each carryover year in which you use part of the deduction.

Partnership and S Corporation Cap

If you are looking at a conservation easement through a partnership, LLC, or S corporation, one rule effectively ended most syndicated deals. Under the SECURE 2.0 Act, a conservation easement contribution by a partnership is disallowed entirely if the claimed deduction exceeds 2.5 times the sum of each partner’s relevant basis in the partnership.² The same rule applies to S corporations and other pass-through entities. Go a dollar over, and the entire contribution loses its qualified conservation contribution status.

The math targets syndication economics directly. If investors put in $100,000 and claim a $400,000 deduction, that 4-to-1 ratio blows through the 2.5x ceiling. Three exceptions apply:

The cap does not apply if three years have passed since the partnership acquired the property, every partner acquired their interest, and (in tiered structures) any intermediate partnership acquired its interest.²
Family partnerships, where substantially all interests are held by one individual and their family members, are exempt.
Easements preserving certified historic structures are carved out.

Run the 2.5x calculation before committing. The rule applies to contributions made after December 29, 2022, and the IRS has finalized regulations implementing it.⁵ Syndicated conservation easements are also designated “listed transactions” under Notice 2017-10, which triggers separate disclosure obligations for participants and their advisors.⁶

What Happens If the IRS Challenges the Deduction

Conservation easements have been an IRS enforcement priority for years, and the agency has won lopsided victories in Tax Court throughout 2025. When the IRS challenges an easement, the outcome is rarely just a small adjustment.

The agency often disallows the entire deduction on technical grounds rather than fighting over value. The recurring reasons:

Deed language does not adequately protect the conservation purpose forever, especially around extinguishment and how sale proceeds are handled after a judicial termination.
The contemporaneous written acknowledgment was late, the appraisal was signed outside the 60-day window, or Form 8283 was incomplete.
The lender never subordinated its mortgage, so the easement could be wiped out in a foreclosure.
The appraiser assumed development potential in the “before” value that zoning, environmental rules, or market conditions did not support.

When the IRS reduces (rather than disallows) a deduction, accuracy-related penalties come on top of the additional tax. Claiming a value of 150% or more of the correct amount is a “substantial valuation misstatement,” which carries a 20% penalty on the underpayment. Claiming 200% or more is a “gross valuation misstatement,” which doubles the penalty to 40%.⁷ Given how aggressively courts have been cutting claimed values, the 40% penalty comes up often. In one 2025 case, a taxpayer claimed a $22 million deduction for an easement on a building purchased 16 months earlier for $6 million; the court found the proper deduction was $900,000.

Safe Harbor Deed Language

The SECURE 2.0 Act directed the IRS to publish safe harbor language for the two deed provisions that show up in nearly every easement and cause the most litigation: the extinguishment clause (what happens if continued conservation use becomes impossible) and the boundary line adjustment clause. IRS Notice 2023-30 provides that language.⁸

The safe harbor extinguishment clause requires that restrictions be terminated only through a judicial proceeding and that the donee’s share of any subsequent sale proceeds be used consistently with the original conservation purpose. The boundary line adjustment clause limits adjustments to those resolved through judicial proceedings over disputed boundaries. Using the safe harbor language does not guarantee your deduction survives audit, but it takes deed wording off the table as a basis to attack perpetuity. Easements connected to listed transactions under Notice 2017-10, or those already subject to penalties or pending litigation, are not eligible.

For a new deed, using the safe harbor language from the start is the straightforward move. The window to amend older deeds to substitute the safe harbor language closed in July 2023, so existing donors who missed that deadline cannot retroactively adopt it.

1
eCFR. 26 CFR 1.170A-14 – Qualified Conservation Contributions
2
Office of the Law Revision Counsel. 26 USC 170 – Charitable, Etc., Contributions and Gifts
3
Internal Revenue Service. Introduction to Conservation Easements
4
Internal Revenue Service. Instructions for Form 8283
5
Federal Register. Syndicated Conservation Easement Transactions as Listed Transactions
6
Internal Revenue Service. Notice 2017-10 – Syndicated Conservation Easement Transactions
7
Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments
8
Internal Revenue Service. Notice 2023-30 – Conservation Easements Safe Harbor Deed Language for Extinguishment and Boundary Line Adjustment Clauses