Why We Do Not Assign a Flat Per Acre Value to Soil Fertility

One of the most common questions we get from farmland buyers and their accountants is:

“What should I use for a per acre soil fertility value?”

Our answer is simple.

We don’t know until we test the soil.

That distinction matters.

There are areas of agricultural tax planning where accountants may use a per acre assumption to help establish the value of an asset. Drainage tile is a common example. An accountant might look at the number of tiled acres, the type and age of the system, current installation costs, and other information to develop a value for the existing tile.

Soil fertility is different.

At Soil Tax Guys, we do not start with a predetermined value such as $500, $1,000, or $2,000 per acre and work backward.

We start with the soil.

Every Farm Is Different

Two farms sitting across the road from each other can have dramatically different fertility levels.

One farmer may have spent decades maintaining phosphorus and potassium at strong agronomic levels.

Another may have consistently mined fertility.

One farm may have received manure.

Another may not have.

One may have recently received lime.

Another may have a completely different soil pH and lime requirement.

Crop rotation, yield history, fertilizer applications, manure management, soil type, nutrient removal, and previous management decisions all affect what is actually present in the soil.

So how could we responsibly say that every acre is worth the same amount?

We can’t.

That is why we test.

Soil Fertility Is Measured, Not Assumed

Our process begins with actual soil samples.

Those samples are analyzed by a laboratory to determine what is physically present in the soil.

From there, we evaluate the results using established agronomic principles and determine the value of the qualifying fertility.

The result is a value derived from the farm itself.

Not a national average.

Not a county average.

Not a percentage of the purchase price.

And not a number selected because it produces an attractive tax deduction.

The soil test drives the valuation.

That is an important distinction.

Why This Is Different From Valuing Drainage Tile

Drainage tile is a physical improvement.

If a farm contains a functioning pattern tile system, an accountant or cost segregation professional can evaluate factors such as installation costs, age, spacing, remaining useful life, and replacement cost.

There is a physical system in the ground that can often be identified and described.

Soil fertility does not work that way.

You cannot drive past a farm and determine how many pounds of phosphorus or potassium are present.

You cannot look at an aerial photograph and determine the soil pH.

You cannot assume a farm contains a certain amount of excess fertility simply because it is located in a productive county.

And you cannot know what the previous operator left behind without measuring it.

That is precisely why soil testing is so important.

Consider Two 160 Acre Farms

Imagine two nearly identical farms sell in the same county.

Both contain 160 acres.

Both have similar soils.

Both have similar productivity ratings.

Both sell for the same price.

Farm A has been aggressively maintained for decades. The previous operator routinely applied fertilizer above crop removal and maintained strong soil test levels.

Farm B has been cash rented for years. Fertility applications primarily followed short term crop needs, and soil test levels have gradually declined.

Should both buyers receive the same Section 180 soil fertility value simply because they each purchased 160 acres?

Of course not.

The buyer of Farm A may have acquired substantially more existing fertility than the buyer of Farm B.

The only way to know is to test both farms.

Our Own Results Show Why Flat Per Acre Values Do Not Work

We see this variation constantly.

Across actual Soil Tax Guys projects, documented per acre soil fertility values have varied significantly.

We have worked on properties with values under $800 per acre.

We have also documented farms exceeding $3,000 per acre.

That variation is not a problem with the methodology.

It is exactly what you should expect from a methodology based on actual soil conditions.

Different farms contain different amounts of fertility.

If every report came back at roughly the same value per acre, I would have questions about the methodology.

We Do Not Work Backward From the Deduction

This is another important part of our approach.

Our job is not to determine how large of a deduction a client wants and then find a way to support it.

Our job is to determine what is actually present in the soil.

Sometimes the results are substantial.

Sometimes they are not.

We provide a free per acre value analysis after the soil test results are available. If there is enough value to make pursuing a comprehensive Section 180 report worthwhile, the client can move forward.

If there isn’t, they know before paying for the full report.

That is how we believe this work should be done.

Agronomy Comes First

Section 180 soil fertility work sits at the intersection of agriculture and tax.

But the underlying question is fundamentally agronomic:

What nutrients were actually present in the soil when the buyer acquired the farm?

That question should be answered by soil testing and sound agronomic analysis.

Then the client’s CPA can determine how the resulting information should be treated on the tax return based on the taxpayer’s individual circumstances.

We want the accountant involved.

We want the client’s tax advisors asking questions.

And we want the methodology to be transparent enough that they can understand exactly how the value was calculated.

No Soil Test. No Measurement. No Credible Valuation.

There is a reason we keep coming back to this.

A flat per acre assumption might be convenient.

But convenience is not the objective.

Documentation is.

When a farmland buyer wants to evaluate existing soil fertility, we believe the process should start with actual field data.

Sample the farm.

Analyze the results.

Apply established agronomic principles.

Determine the value.

Then give the report to the client’s CPA.

We don’t decide what the soil should be worth.

We measure what is actually there.

That is the difference.

Soil Tax Guys provides agronomic soil fertility analysis and opinion of value reporting. We do not provide tax, accounting, or legal advice. Buyers should work with their CPA or other qualified tax professional to determine the appropriate tax treatment for their individual circumstances.