Residual Fertility Tax Deductions Require Caution, Experts Warn

Only properly documented, unexhausted fertilizer applied by prior owners may qualify for Section 180 expensing; broader nutrient-based claims carry significant legal and tax risk.

farming taxes accounting money_adobe stock.png

Adobe Stock

LUBBOCK, Texas (RFD-TV) — Farmers weighing whether to claim a residual fertility deduction face a growing number of legal and tax risks, according to guidance from Tiffany Lashmet, Texas A&M AgriLife Extension Ag Law Specialist.

The deduction — historically used to expense unexhausted fertilizer embedded in purchased farmland — has expanded in recent years to include much broader claims tied to the full nutrient content of soils. Lashmet cautions that these newer approaches lack clear legal support and may expose producers to IRS scrutiny.

At the core of the issue is Section 180 of the Internal Revenue Code, which allows farmers to deduct the cost of fertilizer, lime, and similar materials in the year they are applied. For decades, some farmland buyers have allocated a portion of the land purchase price to unexhausted fertilizer applied by prior owners. While no statute or court case explicitly endorses this, a 1991 IRS technical memo outlined conditions under which such a deduction may be permitted. Producers must prove the presence and amount of prior fertilizer, show that it is being depleted, and demonstrate beneficial ownership — meaning the nutrients are inseparable from the land they now farm.

Problems arise when deductions go beyond unexhausted fertilizer to include general soil nutrients or inflated values tied to basic soil composition. Lashmet notes that courts have repeatedly rejected attempts to depreciate soil itself or claim depletion of inherent soil nutrients. Because Section 180 applies only to added fertilizer, claims tied to naturally occurring fertility or long-ago application histories fall well outside the law’s scope.

For producers considering the deduction, documentation is critical. Claims tied to older land purchases, unfertilized pasture, or broad nutrient profiles are especially vulnerable. Lashmet urges farmers and land buyers to work closely with qualified tax professionals and understand the IRS burden of proof before proceeding.

Farm-Level Takeaway: Only properly documented, unexhausted fertilizer applied by prior owners may qualify for Section 180 expensing; broader nutrient-based claims carry significant legal and tax risk.
Tony St. James, RFD-TV Markets Specialist
Related Stories
In part five of his blog series, “Top 10 Developments in Ag Law and Tax in 2023,” Roger McEowen tackles issue number three, California’s Prop 12 pork regulations.
In part four of his blog series, “Top 10 Developments in Ag Law and Tax in 2023,” Roger McEowen tackles issue number four, the Employment Retention Credit.
In part three of his blog series, “Top 10 Developments in Ag Law and Tax in 2023,” Roger McEowen covers the Corps of Engineers’ mismanagement of Missouri River water levels.
Two more key developments in ag law and taxation from 2023, a crackdown on biodiesel fraud and developments in self-employment taxation (#7 and #6), are the topic of today’s Firm to Farm blog post, the second in a series by RFD-TV agri-legal expert Roger McEowen.
The start of the review of the most important ag law and tax developments of 2023—that is the topic of today’s Firm to Farm blog post by RFD-TV agri-legal expert Roger A. McEowen
Recent developments in ag law and tax — that is the topic of today’s Firm to Farm blog post by RFD-TV-Agri-Legal Expert Roger McEowen.
If you are thinking about making substantial gifts and/or doing so in a complicated fashion, make sure to get good professional advice beforehand. In his latest Firm to Farm blog post, RFD-TV Agri-Legal Expert Roger McEowen tackles the complex rules surrounding financial gifts, charitable donations and estate transfer.
A glimpse into the mindset of the University of Kentucky’s trio of arborists as they relish their role in fostering healthy urban spaces across campus.
Getting strange calls or texts from “Amazon” after placing holiday gift orders? In this AARP Live Minute, experts from AARP reveal three Amazon imposter scams to watch out for as you navigate the holiday season.

Tony St. James joined the RFD-TV talent team in August 2024, bringing a wealth of experience and a fresh perspective to RFD-TV and Rural Radio Channel 147 Sirius XM. In addition to his role as Market Specialist (collaborating with Scott “The Cow Guy” Shellady to provide radio and TV audiences with the latest updates on ag commodity markets), he hosts “Rural America Live” and serves as talent for trade shows.

LATEST STORIES BY THIS AUTHOR:

Fewer placements and historically low marketings point to tighter cattle supplies ahead, with Nebraska and Kansas gaining ground as Texas feedlots face supply pressure and the threat of New World Screwworm.
Farmers should anticipate continued upward pressure on farm labor costs and monitor policy changes that may further impact hiring decisions.
Cotton farmers should weigh potential PLC payments against STAX coverage and act before the September 30 deadline.
U.S. produce growers face a structural disadvantage—cheaper imports driving down prices while rising labor costs squeeze margins. Without new policies or technology, profitability remains uncertain.
Herd rebuilding looks slow, keeping cattle prices supported; beef-on-dairy crosses help fill feedlots, while imports temper—but don’t erase—tightness.
Farmers should watch for soybean export rebounds with harvest, while corn and wheat shipments remain strong and sorghum demand struggles.