Section 179 vs. Bonus Depreciation for Farm Equipment: Which One Wins on Your Next Purchase?

For Idaho and Utah farmers weighing a fall equipment purchase, the question is not whether to write it off. It is how. The tax code offers two paths, Section 179 expensing and bonus depreciation, and picking the wrong one leaves real money on the table at filing.

Both rules let you accelerate deductions on qualifying farm assets. They work differently, they interact differently with state tax, and they favor different situations. A potato grower buying a $200,000 sprayer in October has a different answer than a Cassia County dairy investing in a $1.2 million parlor upgrade.

Here is how to decide before the purchase order is signed.

The two write-offs, side by side

Section 179 lets a farmer elect to expense qualifying property, treating the purchase as an ordinary business deduction in the year the equipment is placed in service. There is an annual dollar cap and a phase-out that reduces the deduction when total qualifying purchases exceed a threshold. Section 179 cannot create or increase a net operating loss, so it is limited to your active farm income.

Bonus depreciation allows a percentage of the cost of qualifying property to be deducted in year one, on top of or instead of Section 179. It has no dollar cap and no income limit, so it can create or extend a loss. Under the One Big Beautiful Bill Act signed in 2025, bonus depreciation was restored to 100% for qualifying property placed in service after Jan. 19, 2025.

Section 179 is asset-by-asset. Bonus depreciation is generally all-or-nothing by class life. That matters if you want to expense some purchases and depreciate others normally.

When Section 179 is the better move

Section 179 shines on small and mid-size purchases when the farm has active taxable income to absorb the deduction. It is also better when you want to pick and choose. You can Section 179 one piece of equipment, take regular depreciation on another, and match the deductions to the tax year you actually want them.

For a hay operation buying a used baler and a set of rakes, Section 179 lets you accelerate the baler and leave the rakes on a standard MACRS schedule. That kind of asset-by-asset control is not available under bonus.

When bonus depreciation wins

Bonus depreciation is the better tool for very large purchases, for farms with rental or passive income streams that Section 179 cannot touch, and for years when you need to create or extend a farm loss.

A Bingham County potato grower who buys $1.5 million of new field equipment in one year can move faster with bonus depreciation than by chaining Section 179 elections across future years. The same is true for a Rexburg dairy expanding facilities that include qualifying single-purpose agricultural structures, drainage tile, and other 15-year land improvements.

Farm buildings on shorter lives, single-purpose agricultural structures, and drainage tile can qualify for bonus depreciation. That is a real advantage over Section 179 when the depreciable life is 20 years or less.

Idaho and Utah state conformity

Federal is only half the picture. Idaho generally conforms to the Internal Revenue Code, which means most federal depreciation choices flow through to the state return, but conformity dates and specific adjustments should be checked with the Idaho State Tax Commission for the current tax year. Utah has historically decoupled from bonus depreciation in some years, so a Cache Valley or Sanpete operation may see a different state result than a neighbor across the Idaho line.

If you own equipment or land in both states, or if your operation crosses the line at any point in the year, run the state math separately. The federal answer does not decide the state answer.

A fall decision framework

Before you sign for equipment this fall, walk through these five steps.

1. Forecast your farm net income for the year, honestly. Section 179 cannot exceed it. 2. Total your expected qualifying property purchases. If you are close to the Section 179 phase-out threshold, the math changes fast. 3. Tag each asset by expected use. A center pivot, a combine, and a shop building have different class lives and different treatment under bonus. 4. Model both methods with a rough tax-year projection. Sometimes a mix wins, Section 179 for one asset, bonus for another. 5. Document the placed-in-service date. Equipment sitting on a trailer at year-end does not qualify. Equipment plugged in and ready to run does.

Run the numbers before the sale closes, not after. The write-off does not fix a bad purchase, but the right election on a good one can move real tax dollars.

This overview is general information, not tax advice for your specific operation. Talk with a Cooper Norman agriculture accounting team about how these rules apply to your farm, and how the current year’s tax planning services fit your equipment plans. When the numbers matter, reach out to a Cooper Norman advisor before you place the order.