Fixed asset depreciation rules decide when a business purchase reduces your tax bill: some assets have to be capitalized and written off over years through the Modified Accelerated Cost Recovery System (MACRS), while others can be expensed immediately under a safe harbor, Section 179, or bonus depreciation. For 2026, the immediate-write-off tools are unusually generous, but each one carries its own dollar cap, timing rule, and eligibility test, and choosing among them changes both this year’s deduction and what you’ll owe if you sell the asset later.
What Counts as a Fixed Asset
A fixed asset is tangible property you use in your business and expect to last longer than one year: buildings, machinery, vehicles, furniture. Because the item serves the business across multiple years, its cost sits on the balance sheet and is deducted gradually through depreciation rather than expensed all at once.
Land is the exception that catches people out. Unlike a building, land doesn’t wear out or become obsolete, and the IRS prohibits any depreciation deduction on it.1Internal Revenue Service. Publication 946, How To Depreciate Property When you buy real property, you have to split the purchase price between the building (depreciable) and the land beneath it (not depreciable), usually based on the sales contract, an appraisal, or the local property tax assessment ratio. A wrong allocation distorts depreciation for the entire life of the property.
When You Can Skip Capitalization
Not every purchase over a year old needs to be capitalized. The de minimis safe harbor lets you expense small-dollar items outright regardless of useful life. If your business has an Applicable Financial Statement (such as a certified audited statement), the ceiling is $5,000 per invoice or item. Without an AFS, it drops to $2,500 per invoice or item.2Internal Revenue Service. Tangible Property Final Regulations
There’s a procedural condition. AFS filers must have a written accounting policy in place at the start of the tax year specifying the capitalization threshold. Businesses without an AFS need a consistent accounting policy on their books at the start of the year, though it doesn’t have to be written. You elect the safe harbor annually on your return, so it isn’t a permanent commitment.
Separately, the IRS recognizes materials and supplies: components costing $200 or less, items with a useful life under 12 months, and consumables like fuel and lubricants. Incidental materials and supplies are deducted when purchased; non-incidental ones are deducted when first used. A $150 spare part sitting on the shelf is deducted when it’s installed, not when it’s ordered.2Internal Revenue Service. Tangible Property Final Regulations
Writing Off the Full Cost in Year One
Above the de minimis threshold, two provisions can still let you deduct the full purchase price in the year you place the property in service. Most businesses use them together.
Section 179
Section 179 is an election. You choose to expense qualifying property in the year it’s placed in service instead of depreciating it. The base statutory limit is $2,500,000, adjusted annually for inflation; for 2026 it rises to approximately $2,560,000.3Office of the Law Revision Counsel. 26 US Code 179 – Election To Expense Certain Depreciable Business Assets Once your total equipment purchases for the year exceed roughly $4,090,000, the deduction phases out dollar-for-dollar until it disappears.
Two constraints matter. First, your Section 179 deduction can’t exceed your taxable income from active business operations for the year; anything above that carries forward. Second, SUVs have their own sub-limit of $25,000, so a $70,000 SUV can only draw $25,000 from Section 179. The property must be tangible, depreciable, and acquired for use in your trade or business. Real property generally doesn’t qualify, though certain improvements to nonresidential buildings (roofing, HVAC, fire protection, and security systems) do.
Bonus Depreciation
Bonus depreciation operates differently. It applies automatically to qualifying property unless you elect out, has no dollar cap, and isn’t limited by business income. What controls the rate in 2026 is when you acquired the asset.
Under the One Big Beautiful Bill Act, qualifying business property acquired and placed in service after January 19, 2025, is eligible for 100% first-year depreciation.4Internal Revenue Service. One Big Beautiful Bill Provisions A machine ordered in March 2025 and installed in 2026 qualifies for a complete write-off. Property acquired before January 20, 2025, follows the older phase-down: equipment bought in 2024 and placed in service in 2026 gets only 20% bonus depreciation, and property acquired before the cutoff and placed in service after 2026 gets nothing.
The typical playbook is to elect Section 179 for a chosen dollar amount, then let bonus depreciation absorb whatever cost remains. Section 179 gives you control, since you decide how much to expense; bonus depreciation is broader but automatic. Section 179 stops at your business income, while bonus depreciation can create or deepen a net operating loss.
MACRS Recovery Periods
Anything you capitalize is recovered through MACRS, which assigns every property type a specific class life.1Internal Revenue Service. Publication 946, How To Depreciate Property Under the General Depreciation System, the common categories are:
- 5-year property: automobiles, light trucks, computers, office machinery, research equipment.
- 7-year property: office furniture and fixtures, plus any asset with no assigned class life.
- 15-year property: land improvements such as fences, roads, sidewalks, and shrubbery.
- 27.5-year property: residential rental buildings.
- 39-year property: nonresidential commercial buildings.
MACRS conventions govern the first and last years of depreciation. Most personal property uses the half-year convention, treating the asset as if placed in service at the midpoint of the year regardless of the actual date. Real property uses the mid-month convention. These conventions block you from claiming a full year of depreciation on something bought in December.
Passenger Vehicle Caps for 2026
Passenger automobiles come with annual depreciation caps under Section 280F that override the MACRS schedule. For vehicles placed in service during 2026, the limits are:5Internal Revenue Service. Rev Proc 2026-15, Depreciation Limitations for Passenger Automobiles
- Year 1 with bonus depreciation: $20,300
- Year 1 without bonus depreciation: $12,300
- Year 2: $19,800
- Year 3: $11,900
- Each year after: $7,160
A $60,000 sedan takes far longer to fully depreciate than its five-year class life suggests. Heavy SUVs and trucks over 6,000 pounds gross vehicle weight escape these caps, which is why they show up so often on business purchase lists, though the $25,000 Section 179 SUV limit still applies.
Repairs Versus Improvements
Every dollar you spend on an existing asset reopens the same question. The tangible property regulations use the BAR test: capitalize a cost if it results in a Betterment, Adaptation, or Restoration of the property. Anything else is a deductible repair.2Internal Revenue Service. Tangible Property Final Regulations
A betterment increases capacity, efficiency, or strength beyond the original condition (swapping a standard roof for a higher-grade, energy-efficient one). An adaptation converts the property to a fundamentally different use (a warehouse converted to office space). A restoration returns a deteriorated asset to working condition or replaces a major component (a new HVAC system, a replaced structural beam).
Costs that keep the property in its current working condition are deductible repairs: repainting walls, patching a small roof section, routine oil changes on fleet vehicles. The test is whether the work extends the asset’s life or increases its value beyond where it started.
Routine Maintenance Safe Harbor
You can expense recurring maintenance you reasonably expect to perform more than once during the asset’s class life, so long as the work keeps the property in its ordinary operating condition. For buildings, the test period is 10 years from the date placed in service. If you anticipated replacing the carpet every seven years when you first occupied the building, those replacements qualify. What matters is your expectation at the time you placed the property in service.
Small Taxpayer Safe Harbor
If your average annual gross receipts are $10 million or less and you own or lease a building with an unadjusted basis under $1 million, you can expense all repair, maintenance, and improvement costs on that building for the year, provided the total doesn’t exceed the lesser of 2% of unadjusted basis or $10,000. You elect it annually per building, so one property can use the safe harbor while another goes through the BAR analysis.
Self-Constructed Assets
When your business builds an asset, costs accumulate in a Construction in Progress account until the asset is ready for use. The uniform capitalization rules under Section 263A dictate what goes in.6Internal Revenue Service. Section 263A Costs for Self-Constructed Assets Direct materials and labor are obvious. Less obvious is the requirement to capitalize allocable indirect costs: indirect labor, employee benefits, insurance, utilities, quality control, and a share of support functions like accounting and purchasing.
Interest can also get pulled in. If you carry debt during construction of “designated property,” you must capitalize the interest you could have avoided had you not spent money on the project. All self-constructed real property is designated property. Tangible personal property qualifies if it has a class life of 20 years or more, an estimated production period over two years, or a production period over one year with estimated costs above $1,000,000.7Internal Revenue Service. Interest Capitalization for Self-Constructed Assets With no outstanding debt, interest capitalization doesn’t apply.
Costs stay in the construction account until the asset is substantially complete and ready for its intended function. That date is the in-service date; the accumulated balance transfers to the permanent fixed-asset account and depreciation begins.
What Happens When You Sell
Selling, retiring, or scrapping a fixed asset removes both its original cost and accumulated depreciation from the books. The gain or loss is the sale price minus the remaining book value (cost minus depreciation claimed). Depreciation recapture is where the tax bill often surprises people.
For equipment, vehicles, and other Section 1245 property, prior depreciation is recaptured as ordinary income. Buy a machine for $100,000, claim $60,000 in depreciation, sell it for $80,000: the $40,000 gain is ordinary income up to the $60,000 of depreciation taken.8Office of the Law Revision Counsel. 26 US Code 1245 – Gain From Dispositions of Certain Depreciable Property The reasoning is that those deductions cut ordinary income in earlier years, so the corresponding gain gets taxed at ordinary rates.
Buildings (Section 1250 property) get better treatment. Unrecaptured Section 1250 gain is taxed at a maximum rate of 25%, generally below the top ordinary rate.9Internal Revenue Service. Topic No 409, Capital Gains and Losses Any gain above the total depreciation claimed is long-term capital gain if you held the property for more than a year.
The transaction goes on Form 4797, which separates gains and losses by property type and holding period and computes the recapture.10Internal Revenue Service. About Form 4797, Sales of Business Property One thing to watch: aggressive first-year deductions through Section 179 and bonus depreciation front-load the depreciation, which means a larger recapture hit if you sell the asset soon after purchase.
Fixing a Past Capitalization Mistake
If you find you’ve been expensing what should have been capitalized (or the reverse), the fix isn’t simply amending a return. The IRS treats capitalization as a method of accounting, so switching requires filing Form 3115.11Internal Revenue Service. Instructions for Form 3115 Designated change numbers identify the specific correction: DCN 192 for a change to capitalizing acquisition or production costs, DCN 184 for a change to capitalizing improvement costs.
The change triggers a Section 481(a) adjustment that captures the cumulative effect across all open and closed years. If you’ve been expensing what should have been capitalized, the adjustment increases taxable income by the total improperly deducted minus the depreciation you would have claimed. A positive adjustment is generally spread over four tax years.
The IRS can also impose a 20% accuracy-related penalty for a substantial understatement of tax. For individuals, that’s an underpayment greater than the larger of 10% of the tax due or $5,000. For corporations other than S corporations, it’s the lesser of 10% of the tax due (or $10,000 if greater) and $10,000,000.12Internal Revenue Service. Accuracy-Related Penalty Filing Form 3115 voluntarily before the IRS finds the error generally supports a reasonable-cause defense.