IRS provisions for excess fertility deductions on purchased farmland and ranchland

[June 25, 2025]   

-This article is intended for educational purposes only and does not constitute tax advice.

Recent attention has been given to farmland and ranchland buyers using Section 180 of the IRS code to depreciate excess fertility on newly purchased or inherited farms and ranches. This deduction can provide a material tax benefit for owners of agricultural land that can help reduce the landowners’ federal tax burden. There are numerous factors to consider when exploring whether this deduction may be advantageous in any specific scenario. This article highlights this important tax tool and assists farmland and ranchland owners in understanding how it works. However, this article is intended for educational purposes only. Please consult your tax and legal advisors before taking any specific actions.

The Deduction is multi-faceted

Excess or residual fertility deductions stem from nutrient levels that exceed what is necessary to grow a crop when the landowner takes title to the property. These standards are ambiguous and subject to interpretation but are generally established by researchers and/or institutions. In Illinois, the University of Illinois Agronomy Handbook is commonly used to establish baselines for calculating the deductions.

The Buyer Will Need Professional Assistance

To safely navigate these complexities, landowners must hire certified agronomy and tax professionals to calculate and claim this deduction. The professionals employed by the land buyer should stand by the taxpayer in the event of an audit. The agronomy professionals are typically paid a flat fee per acre or as a percentage of the tax savings. The cost of hiring a certified agronomist for their service varies widely, as does their approach to making excess fertility calculations. Landowners are encouraged to conduct due diligence on service providers' methodologies and consider audit track records before engaging any specific group.

There are Different IRS Sections to Cover Different Situations

Landowners who meet the IRS standards for actively engaging in farming/ranching and who purchased or inherited their land in the current tax year can take advantage of Section 180. However, other tax code sections allow landowners more passively involved in agriculture, such as collecting cash rent from tenants and/or purchasing or inheriting their land in a prior year, to pursue these deductions. These other sections of the IRS code are Section 167, Section 168, or Section 611. Suppose a landowner does not qualify for Section 180 -- they may still want to consult their tax advisor regarding pursuing an excess nutrient deduction under these other sections of the tax code. Some companies assist farmland and ranchland buyers in retroactively pursuing these deductions using the other three sections of code as far back as the early 2000s to receive tax deductions, which equate to tax savings.

Excess P and K are the Most Common Deductions

Section 180 has been in effect for decades but has gained more attention recently. With increasing costs in fertilizer and farmland/ranchland purchases, this IRS deduction can make purchases less burdensome. Technology has improved the quantification of fertility data. Phosphorus (P) and Potassium (K) are the primary nutrients used to calculate an existing depreciation deduction. However, all the agriculturally necessary nutrients, including micronutrients such as boron, sulfur, and manganese, can also be included. Certified agronomists differ in their calculations, reinforcing the need for landowners to conduct thorough due diligence when selecting a service provider to perform this analysis.

Soil and production properties and practices, such as organic matter content, fertilizer application history, and crop rotations, determine the soil’s excess value. Nitrogen (N) is added to the soil every year and is not residual, so an excess of N is not likely to exist. Naturally occurring elements are not deductible. Most elements are deductible as excess fertility in the soil's top six to seven inches, the standard depth from which soil samples are taken.

Test Soil Immediately and Before Fertilizer is Applied

Before applying fertilizer to recently purchased farmland or ranchland, the owner must complete a soil test soon after the land acquisition to utilize Section 180. The new owner must actively use the land for farming or ranching purposes. Raw land that is sitting idle does not count. Land covered by conservation easements that allow agricultural production can benefit from this deduction. Land in the crop CRP (Conservation Reserve Program) cannot utilize Section 180.


[to top of second column]

Professional soil testing accomplishes the evidence requirement to prove excess residual fertility. After completing a soil test, a certified professional agronomist is used to verify the excess fertility calculations. Notify and discuss claiming the deduction with your tax professional before soil testing and hiring an accredited agronomist. The landowner may want to interview several certified agronomists offering this service. Discuss the findings with your tax professional before choosing the agronomist.

The taxpayer can use the Section 180 deductions during the first year following the farmland or ranchland purchase. The IRS may allow the amortization of fertilizer costs based on the percentage of use or benefit each year. The land buyer does not have to take the entire deduction in the first year. The deduction can be used over three or four years. Your tax advisor can guide you in spreading the deduction. A 60%/30%/10% schedule is sometimes used to deplete excess nutrients over three years. The first year would see a 60% deduction of excess nutrients in the first year, 30% in the 2nd year, and 10% in the 3rd and final year.
The certified agronomist will create a report based on soil tests. The report will include a comprehensive soil test analysis showing nutrient levels compared to industry standards (University of Illinois recommended fertility levels in Illinois). An economic value estimate of the excess nutrients is used to create the nutrient level report. The agronomist will recommend an amortization period based on how long the residual fertility will provide needed nutrients to the growing crop.

The IRS can deny the tax deduction for excess fertilizer supply unless the taxpayer can prove beneficial (controlling) ownership of the excess fertilizer supply held by the farm or ranch's soil. Soil testing documents the levels of excess nutrients for IRS purposes. A further requirement is that the growing crop fully utilizes the excess nutrients. The IRS monitors the use of Section 180 to determine whether the values assigned to depreciable farm or ranch excess fertility are reasonable. Consult your tax advisor before deciding on this tax code utilization for your farm. Deducting excess fertility could result in a higher tax obligation in the future if the farmland is sold.

Credits: Ag Soil Management, Bo Safra Ag LLC, KSI Laboratories, and United Soils, Inc.

About Extension

University of Illinois Extension develops educational programs, extends knowledge, and builds partnerships to support people, communities, and their environments as part of the state's land-grant institution. Extension serves as the leading public outreach effort for University of Illinois Urbana-Champaign and the College of Agricultural, Consumer and Environmental Sciences in all 102 Illinois counties through a network of 27 multi-county units and over 700 staff statewide. Extension’s mission is responsive to eight strategic priorities — community, economy, environment, food and agriculture, health, partnerships, technology and discovery, and workforce excellence — that are served through six program areas — 4-H youth development, agriculture and agribusiness, community and economic development, family and consumer science, integrated health disparities, and natural resources, environment, and energy.

COLLEGE OF AGRICULTURAL, CONSUMER & ENVIRONMENTAL SCIENCES

University of Illinois | U.S. Department of Agriculture | Local Extension Councils Cooperating University of Illinois Extension provides equal opportunities in programs and employment. If you need a reasonable accommodation to attend, call the registration office. Issued in furtherance of Cooperative Extension work, Acts of May 8, and June 30, 1914, in cooperation with the US Department of Agriculture by the Director, Cooperative Extension Service, and University of Illinois.

[Jill Meints
Commercial Agriculture – Special Projects Assistant]

 

 

Back to top