Expense vs. Depreciation: Section 179 and Bonus Depreciation Rules

The choice between expensing and depreciating a business asset comes down to how long the purchase will last and, for longer-lived items, whether you elect one of the tax code’s accelerated write-offs. Anything consumed within a year is an immediate expense. Anything expected to last longer is capitalized and depreciated over a set recovery period, unless it qualifies for the de minimis safe harbor, Section 179, or bonus depreciation, each of which can collapse that multi-year schedule into a single-year deduction.

That is the whole framework. The rest is knowing which bucket a given purchase falls into and when to override the default.

What You Can Deduct Right Away

Ordinary and necessary business expenses that get used up in the current year come off your income in the year you pay or incur them. Office supplies, utilities, insurance premiums, advertising, and wages all sit here comfortably because they don’t create value that lasts beyond the period.¹

Routine maintenance falls in the same bucket. Changing the oil in a company truck, replacing a broken window, servicing an HVAC unit — work that keeps existing property running without making it better or longer-lasting is a current expense.

Repairs vs. Improvements

This is where businesses stumble. The IRS treats a cost as an improvement, and therefore capitalizes it, if the work meets any one of three tests:¹

Betterment: it fixes a pre-existing defect, physically enlarges the property, or materially increases its productivity, efficiency, or output.
Restoration: it replaces a major component or substantial structural part, or brings property that had completely broken down back to working condition.
Adaptation: it converts the property to a new or different use from what you originally intended.

Patching a leaky roof is a repair. Replacing the whole roof is a betterment. Converting a warehouse into retail space is an adaptation. There are no bright-line dollar thresholds, so the analysis is factual, and clear records of what was done and why are what defend the position in an audit.

The De Minimis Safe Harbor for Small Purchases

Strictly applying the useful-life test to a $200 wastebasket that lasts five years would be absurd, and the de minimis safe harbor exists to prevent that. It lets you expense low-cost tangible property regardless of how long it lasts.¹

The ceiling depends on your financial reporting. Without an applicable financial statement, you can expense items costing up to $2,500 per invoice or per item.² With an AFS (generally, audited financial statements prepared under GAAP), the ceiling rises to $5,000. Most small businesses don’t have an AFS, so the $2,500 limit is the relevant one.

To use the safe harbor you need a written accounting policy in place at the start of the tax year that sets your capitalization threshold, you have to treat qualifying amounts as expenses on your books consistently, and you elect the safe harbor annually on your tax return. One trap worth knowing: your internal policy can sit above the IRS ceiling, but the federal safe harbor still caps out at $2,500 without an AFS. Anything more expensive follows the normal capitalization rules.

When Depreciation Is Required

If a purchase doesn’t qualify as a current expense or fit under the safe harbor, you capitalize it and recover the cost through depreciation. Property has to meet all four of these tests to be depreciable:³

You own it (not merely rent or license it).
You use it in your business or to produce income.
It has a determinable useful life.
It is expected to last more than one year.

Land is the notable exception. It never wears out, so it never gets depreciated. Buy a building and you depreciate the structure but not the ground it sits on.

The system almost everyone uses is the Modified Accelerated Cost Recovery System, which the IRS mandates for property placed in service after 1986.³ Under MACRS, each asset is assigned to a class with a fixed recovery period; you don’t estimate how long the item will last in your particular business, the IRS tells you how many years to use.

Common Recovery Periods

These are the classes most businesses run into:⁴

5-year: cars, trucks, computers, copiers, and research equipment.
7-year: office furniture and fixtures, and anything not specifically assigned elsewhere.
15-year: land improvements like fences, sidewalks, and parking lots, plus interior improvements to nonresidential buildings.
27.5-year: residential rental buildings.
39-year: nonresidential real property, such as an office building or retail store you own.

The 7-year class is the default when nothing else fits, and a surprising range of assets end up there. Publication 946 lists hundreds of asset types with their assigned classes when a specific item is in doubt.

Section 179: Electing the Full Deduction

Section 179 lets you take the entire cost of qualifying property as a first-year deduction instead of stretching it across the MACRS schedule.⁵ It’s elective and dollar-specific: you pick how much to expense, up to the annual limit.

For the 2026 tax year, the maximum deduction is $2,560,000, and the deduction begins phasing out dollar-for-dollar once you place more than $4,090,000 of qualifying property in service during the year. Both figures are inflation-adjusted from the statutory base amounts.⁵

Qualifying property covers tangible personal property such as machinery, equipment, and off-the-shelf software, plus certain nonresidential real property improvements — roofs, HVAC systems, fire alarms, and security systems.⁶

The catch: Section 179 cannot create or increase a net operating loss. Your deduction is capped at your total taxable income from all active trades or businesses for the year.⁵ If your business earns $80,000 and you buy $120,000 of equipment, you can only deduct $80,000 under Section 179 this year. The remaining $40,000 carries forward.

Vehicles get their own treatment. Light passenger vehicles under 6,000 pounds have a much lower first-year cap. Heavy SUVs and trucks with a gross vehicle weight rating above 6,000 pounds qualify for a substantially larger deduction, though SUVs are subject to a separate $32,000 cap under Section 179. Vehicles above 14,000 pounds, or those modified so they can’t easily double as personal transportation, face no special Section 179 restriction. Business use must exceed 50%, and the deduction is prorated to the actual business-use percentage.

Bonus Depreciation: Automatic and Uncapped

Bonus depreciation runs on different rails. It applies automatically unless you elect out, there’s no dollar ceiling, and it isn’t limited by your taxable income, so it can generate a net operating loss that Section 179 cannot.

The One Big Beautiful Bill, signed in 2025, permanently restored 100% bonus depreciation for qualified property acquired after January 19, 2025.⁷ That reverses the phase-down that had been cutting the deduction by 20 percentage points a year since 2023. For 2026 and beyond, qualifying assets can be fully written off in the first year.

Qualifying property is new and used tangible property with a MACRS recovery period of 20 years or less, along with certain software.⁸ Used property counts as long as you haven’t used it before and you buy it from an unrelated party.

How the Two Stack

When you place a capital asset in service, deductions apply in this order: Section 179 first, then bonus depreciation on whatever cost remains, then regular MACRS on any balance left over.⁴ With 100% bonus depreciation back, most equipment purchases will be fully recovered in year one regardless of which method carries the weight.

The reason to still think about Section 179 is control. Bonus depreciation is all-or-nothing within a MACRS class (you can opt out by class, but not by dollar amount within a class). Section 179 lets you pick an exact figure. If you want to smooth deductions across years — say you expect much higher income next year — you can opt out of bonus depreciation for a given class and use Section 179 to expense the precise amount that makes sense this year.

When Expensing Isn’t the Best Move

Being allowed to deduct the full cost in year one doesn’t mean you should. A startup with little taxable income gets almost nothing from a giant first-year write-off; the deduction is worth more later, when income actually materializes. A business anticipating a much higher tax bracket next year may prefer to spread the cost into that year rather than waste it against lower-bracket income now.

The tools layer well. The de minimis safe harbor clears the small stuff off the books without tracking. Section 179 gives you a dial for the mid-range. Bonus depreciation sweeps up everything else on autopilot. Using them together, rather than defaulting to the maximum deduction every year, is where planning pays off.

Filing and Recordkeeping

File IRS Form 4562 with your return whenever you place depreciable property in service, elect Section 179, or take bonus depreciation. Because Section 179 is elected on the return itself, you can decide after the year ends how much to expense.

Keep records showing the date each asset was placed in service, its cost, and the business-use percentage. Those three details determine which methods apply and how much you can claim.⁴

1
Internal Revenue Service. Tangible Property Final Regulations
2
Internal Revenue Service. Notice 2015-82 – Increase in De Minimis Safe Harbor Limit
3
Internal Revenue Service. Topic No. 704, Depreciation
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Internal Revenue Service. Publication 946, How To Depreciate Property
5
Office of the Law Revision Counsel. 26 U.S. Code 179 – Election To Expense Certain Depreciable Business Assets
6
Internal Revenue Service. Depreciation Expense Helps Business Owners Keep More Money
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Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill
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Internal Revenue Service. Additional First Year Depreciation Deduction (Bonus) – FAQ