Farm Land Improvements: Drainage, Irrigation, and Soil Conservation Tax Deductions

Farmers spend heavily on improving their land, and the money goes in many directions: drainage tile to pull water off saturated fields, irrigation systems to push water onto dry ones, earth grading to correct surface flow, lime to fix soil pH, and clearing to convert overgrown acres into productive ground. The tax treatment of these expenditures is not uniform. Some qualify for a current deduction under special farming provisions in the Internal Revenue Code. Others must be capitalized and depreciated over time. A few get added to the basis of the land itself, which means no depreciation deduction ever, because land has no recovery period. Getting the classification right on a single drainage project can move tens of thousands of dollars from “deductible this year” to “locked up in basis for decades,” or the other way around.

What counts as a conservation expense under Section 175?

IRC 175 is one of the oldest farming-specific provisions in the Code, and its purpose is straightforward: when a farmer spends money on conservation work that would otherwise be a capital expenditure (because it improves the land rather than maintaining it), Section 175 allows a current deduction instead.

The qualifying categories are defined by what the work physically involves. Treatment or moving of earth qualifies, and this includes leveling, conditioning, grading, terracing, contour furrowing, and restoration of soil fertility. Construction of earthen dams, waterways, outlets, and drainage ponds qualifies. So does the planting of windbreaks, the construction of drainage ditches and irrigation ditches, the building of diversion channels, and similar expenditures aimed at soil or water conservation or erosion prevention. Expenses to drain or fill wetlands, or to prepare land for center pivot irrigation, do not qualify.

Two conditions must be met. First, the farmer must be engaged in the business of farming (hobby farms don’t qualify). Second, the expenditures must be consistent with a conservation plan approved by the Natural Resources Conservation Service (NRCS, formerly the Soil Conservation Service) or a comparable state agency. The plan can be an NRCS individual site plan, an NRCS county plan listing the practices approved for the county, or a comparable state agency plan; a practice that isn’t on the county plan needs an individual site plan. A copy of the plan belongs in the permanent tax file.

The distinction between earthwork and depreciable systems is critical, and this is where many farmers (and preparers) make mistakes. Earthen work that isn’t part of a depreciable structure, such as grading a field, terracing, or digging an open drainage ditch, qualifies under Section 175. A drainage tile system does not, and that includes the work to put it in. Drainage tile is tangible property with a determinable useful life, which makes it depreciable under MACRS. The IRS treats the wages, fuel, hauling and dirt moving to install it (digging and backfilling the tile trenches) as part of the cost of that depreciable system, not as Section 175 earthwork (Treas. Reg. 1.175-2(b)(1); IRS Pub. 225). The same logic applies to irrigation pipe and sprinkler components: the pipe, the hardware and the labor to install them are all depreciable. When a contractor invoices a single lump sum, the farmer needs the invoice broken out between separate earthen work (surface grading, open earthen ditches) and the tile or pipe system, installation included, before filing the return.

What’s the 25% income cap on Section 175?

The deduction under Section 175 cannot exceed 25% of the farmer’s gross income from farming for the tax year. “Gross income from farming” means gross income from producing crops, fruits, fish, or other agricultural products, or from livestock, including gains from selling draft, breeding, or dairy livestock. It does not include gain from the sale of farmland or equipment (those are capital or Section 1231 gains, not farming income in the Section 175 sense).

If the conservation expenses exceed 25% of gross farm income, the excess carries forward to succeeding years, subject to the same 25% cap in each carryforward year. The carryforward is unlimited in duration, so it’s never lost, just deferred.

For most commercial-scale farmers, the 25% cap is not a binding constraint. A farmer with $600,000 in gross farm income can deduct up to $150,000 of Section 175 expenses. But for beginning farmers, farmers with a bad crop year, or farmers undertaking a massive conservation project relative to the size of the operation, the cap can defer a portion of the deduction for several years.

What does NOT qualify under Section 175?

The statute is narrower than many farmers assume. The following do not qualify for the Section 175 current deduction:

• Farm buildings, greenhouses, silos, and other structures (these are depreciable under MACRS)
• Expenses for acquiring land
• Equipment purchases (depreciable under MACRS or Section 179)
• Drainage tile and irrigation pipe (depreciable under MACRS, 15 years for drainage tile, not deductible under Section 175, because they are tangible property with a determinable useful life rather than earthwork)
• Expenses that are already deductible as ordinary and necessary business expenses (routine maintenance of existing conservation structures, for instance, is deductible under Section 162 and doesn’t need Section 175)

The tile-versus-earthwork distinction deserves extra emphasis. The whole cost of a tile system goes on the depreciation schedule: the tile, fittings and outlets, plus the trenching, laying and backfill labor to install them. Only separate earthen work that isn’t part of the tile system (for example, surface grading or an open drainage ditch) is deductible under Section 175. Getting this allocation wrong is an audit risk, because a Section 175 deduction that includes tile or its installation cost doesn’t hold up.

How does Section 180 handle fertilizer and lime?

IRC 180 addresses a different category of land improvement: fertilizer, lime, and other materials used to enrich, neutralize, or condition farmland. Without Section 180, many of these costs would have to be capitalized because their benefit extends substantially beyond the current year. Agricultural lime, for example, corrects soil pH for 3 to 5 years. A heavy phosphorus or potassium application might benefit multiple crop years. Under general capitalization rules, costs that produce a benefit lasting more than 12 months should be capitalized and amortized over the benefit period.

Section 180 overrides that result. A farmer can elect to deduct the full cost of qualifying fertilizer and lime in the year paid or incurred, regardless of how long the benefit lasts. Unlike Section 175, there is no income cap. The farmer can deduct $200,000 of lime in a year with $150,000 of gross farm income and use the resulting loss to offset other income.

The election is annual. You make it by claiming the deduction on the return for the year the expense is paid or incurred, and once made it can’t be revoked without IRS consent.

Qualifying materials include commercial fertilizer (nitrogen, phosphorus, potassium blends), agricultural lime (calcitic and dolomitic), gypsum applied for soil conditioning, and other soil amendments applied to enrich or neutralize the soil. Manure purchased from another operation and spread on the farmer’s fields also qualifies. Manure produced by the farmer’s own livestock is not an additional expense (the cost is already captured in feed and animal care), so there’s nothing to deduct separately.

What triggers recapture when improved land is sold?

Section 175 deductions are subject to recapture under IRC 1252 when farm land you’ve held for less than 10 years is disposed of. (Section 180 fertilizer and lime deductions aren’t covered by Section 1252.) The policy rationale is simple: Congress gave farmers a current deduction for expenditures that improved the value of the land, and if the farmer turns around and sells the improved land at a profit, a portion of the prior deductions should be recaptured as ordinary income rather than treated as capital gain.

The recapture clock runs from the date you acquired the land, not the date of the deduction. If the land is disposed of within 5 years after you acquired it, 100% of the Section 175 deductions on that land are recaptured as ordinary income (limited to the gain on the land). The percentage then steps down: 80% in the sixth year, 60% in the seventh, 40% in the eighth and 20% in the ninth. Land held 10 years or more has no recapture.

Section 1252 applies only to deductions allowed under Section 175, not Section 180. But if the sale price of the land includes part of the cost of fertilizer or lime you applied, the IRS treats the amount attributable to it as ordinary income (Pub. 225).

The practical implication is that farmers who intend to sell land in the near term should think carefully before taking Section 175 deductions on it. If the sale is expected within 10 years of buying the land, part or all of the deduction may be clawed back on the sale. For a long-term holder, recapture is rarely a concern.

Which land improvements are capitalized and depreciated?

Farm improvements that do not qualify under Section 175 or Section 180 are capitalized and, if they have a determinable useful life, depreciated under IRC 168. Drainage tile, farm roads, bridges, and livestock water wells are 15-year MACRS property. This category includes:

• Drainage tile and plastic drain lines
• Irrigation systems built into the land (confirm the asset class before choosing a recovery period)
• Farm roads and bridges
• Water wells
• Ponds and dams, but only if the structure has a determinable useful life (earthen ponds generally aren’t depreciable, and their earthwork may qualify under Section 175)

These 15-year assets use the 150% declining-balance depreciation method under GDS (not the 200% method used for 5-year and 7-year equipment). Under ADS, the recovery period is 20 years using straight-line.

Agricultural fencing (post-and-wire, electric, or board) is not in the 15-year group. IRS Pub. 225 lists agricultural fences as 7-year property, or 10 years under ADS (IRS Pub. 225, Table 7-1).

The important news is that 15-year land improvements are eligible for 100% bonus depreciation under IRC 168(k), now made permanent by the One Big Beautiful Bill Act for property acquired after January 19, 2025. They are also eligible for Section 179 expensing in certain situations. So while these assets must be capitalized (they don’t qualify for a Section 175 current deduction), the practical effect is often full expensing in the year placed in service through bonus depreciation. The equipment depreciation guide explains how Section 179 and bonus depreciation interact and the strategy for sequencing the elections.

Why are land clearing costs so unfavorable?

IRC 182 formerly allowed farmers to deduct the cost of clearing land, including removing trees, stumps, brush, and rocks, to make it suitable for farming.

Congress repealed Section 182 in the Tax Reform Act of 1986. Since then, land clearing costs must be capitalized and added to the basis of the land. Because land has no recovery period under MACRS (land is never depreciable), these costs produce no depreciation deduction at all. The farmer spends the money, the land’s basis increases, but no tax benefit arises until the land is sold, when the higher basis reduces the capital gain.

This is one of the most punishing results in the farm tax code. A farmer who spends $75,000 clearing timber and stumps from 40 acres to convert it to cropland gets zero current deduction. The $75,000 sits in the land basis indefinitely. If the farmer never sells, the deduction is never recovered. If the farmer sells in 30 years, the $75,000 reduces the capital gain, but inflation has eroded the real value of that basis increase substantially.

The contrast with conservation earthwork on existing cropland is stark. Grading, terracing, and contour-furrowing land that is already used in farming is deductible under Section 175. But Section 175 covers only land used in farming, so on newly cleared timber ground the first round of earthwork is a development cost that goes into basis too. Farmers planning to convert rough ground to production should budget the clearing and the initial land preparation with the understanding that there’s no current tax benefit; later conservation work, once the land is in production, can qualify.

How are these deductions reported on the return?

Section 175 and Section 180 deductions are reported on Schedule F, which individual farmers attach to Form 1040 and farming partnerships attach to Form 1065 (corporations report these deductions on their own return). Section 175 expenses go on Part II of Schedule F, line 12 (Conservation expenses). Section 180 fertilizer and lime costs go on the line for fertilizers and lime in Part II.

Bonus depreciation on drainage tile and other 15-year land improvements is reported on Form 4562 (Depreciation and Amortization), which flows to Schedule F. The farmer should use a separate asset entry for the tile (or other depreciable improvement) to clearly document the asset class, recovery period, and depreciation method.

The Schedule F guide walks through the full reporting framework for farm income and expenses, including how these deductions interact with self-employment tax.

How does conservation spending relate to easements?

Conservation spending under Sections 175 and 180 improves the land for farming while also protecting soil and water resources. Conservation easements take a different approach: the farmer voluntarily restricts development or other uses of the land in exchange for a charitable contribution deduction. The two strategies are complementary. Section 175 has no rule against land that is later placed under a conservation easement; what matters is that the land is used in farming when the conservation work is done.

The conservation easement guide covers the charitable deduction rules, qualified appraisal requirements, and the enhanced deduction limits available to qualifying farmers.

What should I do next?

The distinction between deductible earthwork, depreciable materials, and capitalized land costs is one of the more technical areas on a farm return, and the stakes are real. A contractor’s invoice that doesn’t separate earthen conservation work from the tile or pipe system can cost a farmer tens of thousands of dollars in misallocated deductions. A missed Section 180 election on a large lime application means capitalizing costs that could have been deducted in full. And land clearing, while economically necessary, produces one of the worst tax outcomes in the Code.

These guides cover the related topics:

• Schedule F: reporting farm income and expenses, where conservation and improvement deductions are reported
• Farm equipment depreciation, Section 179, and bonus depreciation, how 100% bonus depreciation works for drainage tile and other 15-year property
• Conservation easements for farmers, the charitable deduction for placing farmland under permanent restriction

Related guides:

• Farm Commodity Hedging Futures Tax Treatment
• Farm Conservation Easement Tax Deduction
• Farm Crop Insurance Disaster Payments Tax
• Farm Equipment Depreciation Section 179 Bonus
• Farm Estate Planning Succession Irc 2032A

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.