IRC Section 180 Summary
A little-known tax provision IRC section 180 is drawing new attention as farms, ranches and agricultural lands move from one generation to the next.
A Mason & Morse Ranch Company Introduction
At Mason & Morse Ranch Company, we spend a great deal of time working with farm and ranch families as land moves from one generation to the next. Increasingly, those conversations involve more than simply determining what the land is worth or whether a family should keep, lease or sell it.
They also involve understanding the individual components of a property that may have accumulated value over decades of ownership.
One area receiving more attention today is residual soil fertility and the tax treatment commonly associated with Internal Revenue Code Section 180.
Section 180 itself is not new. It has been part of the Internal Revenue Code since 1960. Yet despite being available for decades, it remains unfamiliar to many farm and ranch owners, heirs and even experienced agricultural operators.
We believe that is beginning to change.
Across agricultural America, more farms, ranches and agricultural properties are transitioning from one generation to the next. When property passes through an estate, inherited land generally receives a new tax basis based on fair market value at the time of inheritance. That transition often gives families and their advisors a reason to look more closely at the individual components that contribute to the property's value.
Most people immediately think about the land itself, improvements, water, agricultural production and other physical assets.
Soil fertility is rarely part of that conversation.
Yet a previous generation may have spent decades building fertility into a farm or ranch through fertilizer applications, soil management and agricultural stewardship. That fertility can remain in the soil when the property is sold or inherited and, in certain circumstances, may represent measurable economic value.
That is where Section 180 becomes an important concept for agricultural landowners to understand.
Mason & Morse Ranch Company does not provide tax, legal or accounting advice. Our role is to help landowners recognize the many factors that can influence the value and long-term economics of farms, ranches and agricultural land and, when appropriate, bring qualified specialists into the conversation.
For that reason, we asked Jeremiah Windell of Advanced Agrilytics to explain residual fertility, how it is measured, where Section 180 may come into play and why landowners should understand the opportunity before making decisions following the purchase or inheritance of agricultural property.
Jeremiah has spent the past ten years with Advanced Agrilytics, where he works directly with farmers, ranchers, landowners and their advisors on residual fertility valuation. He also farms in Indiana with his twin brother and their father, giving him a perspective that combines the technical side of soil fertility with the realities of operating and transferring agricultural land from one generation to the next.
What follows is Jeremiah's explanation of a provision that has existed for decades but that a growing number of agricultural landowners are beginning to rediscover.
The Fertility a Previous Generation Leaves Behind
By Jeremiah Windell, Advanced Agrilytics
Ranch and farm ground tends to change hands about once a generation. When it does, the ledger gets settled on nearly everything: the deeded acres, the water, the improvements, the grazing capacity, the comparable sales down the road. What nobody itemizes is the fertility a previous generation spent decades building into the soil, application by application, still sitting in the top six to eight inches and still feeding whatever grows there next.
The buyer pays for it either way. Internal Revenue Code Section 180 lets them name it.
What the Deduction Is, and Isn't
Section 180 has been on the books since 1960. It allows a taxpayer engaged in farming to deduct expenditures for "fertilizer, lime, ground limestone, marl, or other materials to enrich, neutralize, or condition land used in farming" rather than capitalize them. Applied to a purchase or an inheritance, part of the price is attributable to unexhausted fertilizer the prior owner left behind, and that portion can be recovered.
Two things get misunderstood. First, "Section 180" is industry shorthand, and there can be different code sections utilized. Second, this is a deduction against basis, not free money. Take it, and basis drops. It is recovered as the fertility is actually consumed by subsequent crops or forage, commonly across three to four years, which is why it tends to favor owners who hold long term.
"I farm in Indiana with my twin brother and our dad. What we are really doing is trying to hand something on in better shape than we found it, and that is what most of the ranch families I talk to are after too. Keeping ground in a family across a generation is harder than it used to be, and it often comes down to cash flow in the years right after a transition. The fertility a previous generation built into that soil is real, and it can be measured. Section 180 is one of the tools that can help a family hold on to what they built. It is not the whole answer, but it is a real one, and most people have never been told it exists."
Jeremiah Windell, Advanced Agrilytics
Who This Actually Reaches
The people asking about this fall into three groups, and they are asking three different questions.
The operator who is expanding. A rancher or farmer buying the neighbor's place, or adding a unit two counties over. The most straightforward case, because the active farming requirement is already satisfied by an operation that exists. The question is rarely eligibility. It is whether the fertility on the new ground was ever measured before the first application went out.
The investor who does not farm. Ground bought as an asset and run by a tenant. The statute covers land farmed "by the taxpayer or his tenant," so leasing does not automatically foreclose the deduction, but the structure of the lease matters, and so does the owner's level of participation. This is the group most often told "you don't qualify" by someone who never looked at the arrangement.
The heir. The fastest-growing group we hear from, and the one with the most at stake. When land passes at death, basis resets to fair market value, and that new basis includes the fertility in the soil, documentable as of the date of death. The heir is usually weighing something larger at the same time: keep the ground, lease it, or sell now that basis has stepped up. Residual fertility is one input into that decision rather than the answer to it, and it is worth knowing the number before the decision gets made rather than after.
"When I'm evaluating a land acquisition, I want to make sure we've accomplished the fundamentals first. My focus is making sure the landowner understands the opportunities and risks, that we've structured things appropriately from the start, and that the documentation file can stand on its own. Strong support comes from quality agronomic work, including third-party agronomists, tight sampling grids, and laboratory testing. I also encourage buyers not to overlook the assets on the farm that can be depreciated. That's an area where the rules are often much clearer, and a Farm Capital Allocation can help identify opportunities that might otherwise be missed."
Keaton Dugan, CPA, Pinion
What It Is Worth
Properly executed, residual fertility commonly falls between $500 and more than $2,000 per acre, depending on the ground, the prior owner's program and the acquisition date.
Take 1,000 acres at $1,000 per acre, purely for illustration: a $1,000,000 valuation, recovered across the depletion window rather than all at once, against $40,000 of valuation work at $40 per acre. Advanced Agrilytics prices it that way deliberately, tying the fee to the documentation rather than to a percentage of the deduction or of anyone's tax savings.
One honest note that separates a description from a sales pitch: a large computed value is not automatically a large usable one. What a given owner can use depends on their own income and circumstances, which is worth modeling with an advisor rather than assuming from a headline per-acre figure.
Defensibility is the whole game. The number that survives questioning is the only one worth having.
Why Measurement Is the Entire Question
There is no comprehensive regulation here. The guardrails come from limited guidance and case law, and the taxpayer carries the burden of proof.
The constraint that matters most is excess, not total. Land and its native nutrients are not depreciable. Only fertility above the field's own critical level, above what the soil naturally supplies and the crop or forage requires, is reachable. Critical levels are not a universal constant. They shift with cation exchange capacity, texture, pH and organic matter, so derived from each field's own soil they function like a fingerprint, and native nutrients are excluded by construction.
IRS Private Letter Ruling 9211007 frames what a claim must show: the presence and extent of the fertilizer supply, the fertility attributable to the prior owner's applications, a basis to measure the increase in that land's fertility and the period over which it will be exhausted.
In that ruling, the taxpayer tried to support the claim with fertility levels on comparable parcels in the area. The IRS rejected the approach, reasoning that soil fertility is inherently variable and comparison studies therefore give no basis for measuring the fertility of the land in question.
A regional average, a county figure or a published benchmark makes the same error. It describes a category. The deduction has to describe a parcel.
Pricing is the other place a valuation quietly fails. A pound of nutrient costs wildly different amounts depending on its source. A pound of K2O runs roughly $0.41 from MOP to $1.14 from K-Mag. Calcium ranges from about four cents a pound in bulk ag lime to well over a dollar in calcium nitrate, a spread driven entirely by product selection.
Match each nutrient to the compound that actually represents it, priced in the month and year of acquisition rather than at today's counter, and unbundle multi-nutrient carriers, because assigning all of K-Mag's cost to potassium double-counts the magnesium and sulfur that same price buys.
Calculate, Don't Estimate
That is the discipline Advanced Agrilytics built its Residual Fertility Valuation around.
| Element | Common Shortcut | Defensible Approach |
|---|---|---|
| Baseline | Regional or county average | Field-specific critical levels, point by point |
| What's valued | Total soil nutrients | Excess only, above critical level |
| Pricing | Generic or mismatched compound | Compound-specific, 15+ years verified |
| Resolution | Composite, low density | Point-level, sub-acre with geospatial maps |
| Lab data | As-reported, mixed methods | Normalized across labs and extractants |
| Transparency | Proprietary index | Traceable calculation, nutrient by nutrient |
"We built the most accurate residual fertility methodology on the market so that every acre we value exceeds the available guidelines and stands up to scrutiny. Our company will continue to lead and define the agronomic path for residual fertility tax deductions."
Kenny Avery, CEO, Advanced Agrilytics
Behind that sits a precision agronomy company servicing 1.5 million acres annually across 11 states, with 105 professionals including more than 60 agronomists and data scientists. Residual fertility valuation is not the business. It is an application of the business, which is also why the firm will still be here in year seven if anyone ever asks about the file.
The Honest Part
Eligibility is a real gate, and narrow descriptions of it are often wrong. Providers who present material participation as a flat requirement are drawing the box too tightly, and providers who wave the question away are doing the reader no favors either. It is answered by your CPA on your facts.
A missed soil test is not always fatal. The ideal sequence is a test after closing and before new fertilizer. Where that window was missed, acquisition-date fertility can be reconstructed by working backward from current tests, crops grown, yields removed and inputs applied since. It carries a heavier documentation burden, and few providers do it.
Reaching back has limits worth understanding. Section 180 applies to tax years beginning after December 31, 1959, and older ground runs through a change in accounting method on Form 3115. But a valuation that cannot be priced to the month of acquisition cannot be defended to it either, which is why our compound-specific pricing record, and the practical reach of the work, begins in January 2010.
"In ranch brokerage, we spend a great deal of time helping families understand what actually creates value in a property—water, soils, agricultural production, improvements, recreation, location and the stewardship that may have taken place over generations. Residual soil fertility is a good example of a component that may have real economic value but rarely appears on a property summary or in an estate conversation. As more farms and ranches transition from one generation to the next, landowners should at least know the question exists and then work with the appropriate agronomic and tax professionals to determine whether it applies to their situation."
Bart Miller, ALC, Managing Broker, Mason & Morse Ranch Company
Ground Worth Keeping
Fertility is one of the few things a previous generation hands down without anyone writing it into a will. It is in the soil, it is measurable, and it was paid for at closing whether or not it ever appeared on a page in the file.
Whether it matters for your operation is a question for your CPA. Whether it can be documented well enough to matter is a question for an agronomist. If you have bought or inherited ground and the fertility was never measured, that record is still there and still readable.
The conversation starts with the property: the acreage, the acquisition or date of death, and whatever soil data already exists.
Jeremiah Windell, Advanced Agrilytics
[email protected] | 812-734-6484
Five Questions for Any Residual Fertility Provider
How do you set the baseline?
A county average, a regional "normal," or a published benchmark cannot establish what your prior owner left in your field.
Point-level data, or a field average?
Ask to see where every sample was pulled and the per-sample lab table behind the maps.
Is the extraction method identified and reconciled?
Bray-1, Olsen, and Mehlich-3 results are not interchangeable, and the units do not reveal which was used.
Which compound was priced, and at what date?
The right product at its market price in the month of acquisition, not a current retail quote on an unknown formulation.
How are you paid, and will you be here in year seven?
A fee tied to deduction size creates one set of incentives; a firm whose only product is this deduction has a different durability profile than a working agronomy company.
About Jeremiah Windell
Jeremiah Windell has spent the past ten years at Advanced Agrilytics, where he runs the Section 180 business unit alongside Rick Riegner. He farms in Indiana with his twin brother and their dad.
Reach him at [email protected] or 812-734-6484.
This article is provided for educational and informational purposes only and does not constitute tax, legal, or accounting advice. Eligibility, the applicable Internal Revenue Code section, valuation, and filing approach must be determined by the reader's own qualified CPA or tax advisor. An agronomic residual fertility valuation provides documentation and valuation inputs only; it does not determine deductibility. Figures cited are illustrative and are not a prediction of results in any particular case.