Land improvements do not qualify for the Section 179 deduction. The IRS excludes “land and land improvements” from Section 179 by statute, and Publication 946 spells out the common examples: paved parking areas, fences, bridges, wharves, docks, and swimming pools.1Internal Revenue Service. Publication 946, How to Depreciate Property These items are still depreciable — they are 15-year property under MACRS — but you cannot elect to expense them all at once under Section 179. If you want a full first-year write-off for a new parking lot or fence, bonus depreciation is the tool that fits.
Why Land Improvements Are Excluded
Section 179 lets a business deduct the entire cost of qualifying property in the year it is placed in service. To qualify, an asset must be tangible property depreciable under MACRS and classified either as Section 1245 property (generally equipment, machinery, and other tangible personal property) or as “qualified real property” as the statute defines it.2Office of the Law Revision Counsel. 26 USC 179 – Election to Expense Certain Depreciable Business Assets
Land improvements sit outside both categories. They are classified as Section 1250 property, a different tax bucket, and they are not on the short list of items the statute treats as qualified real property. That is why a $200,000 parking lot is depreciable property but not Section 179 property.
The land itself is treated even more restrictively. Under Publication 946, the cost of land — along with clearing, grading, planting, and landscaping tied to the land — is never depreciable at all, because land does not wear out or become obsolete.1Internal Revenue Service. Publication 946, How to Depreciate Property
Examples the IRS Lists as Excluded
- Paved parking areas and driveways
- Fences
- Bridges
- Wharves and docks
- Swimming pools
Sidewalks and outdoor drainage systems fall into the same 15-year land-improvement category and are treated the same way for Section 179 purposes.
Building Improvements That Do Qualify
The confusion around land improvements often comes from a nearby rule: certain improvements to nonresidential buildings can be expensed under Section 179 through the “qualified real property” election. This is a separate category from land improvements and it is worth knowing where the line falls.
The first piece of qualified real property is qualified improvement property (QIP): improvements to the interior of a nonresidential building placed in service after the building was first put into use. QIP does not include building enlargements, elevators or escalators, or changes to the building’s internal structural framework.3Legal Information Institute. Definition: Qualified Improvement Property From 26 USC 168(e)(6) New flooring, upgraded lighting, and interior wall or ceiling work inside a commercial building are typical examples.
The second piece covers four specific improvements to nonresidential real property, placed in service after the building was first occupied:
- Roofs
- Heating, ventilation, and air-conditioning (HVAC) property
- Fire protection and alarm systems
- Security systems
These four apply only to nonresidential buildings; improvements to a residential rental do not qualify, and the taxpayer must affirmatively elect Section 179 treatment on the return.2Office of the Law Revision Counsel. 26 USC 179 – Election to Expense Certain Depreciable Business Assets
Notice what is not on this list: anything outside the building envelope. A new roof qualifies; the parking lot next to the building does not. A fire alarm inside the building qualifies; the perimeter fence around the property does not.
Bonus Depreciation: The Actual Route to a First-Year Write-Off
If Section 179 is closed to land improvements, bonus depreciation is usually open. The One, Big, Beautiful Bill Act restored a permanent 100 percent additional first-year depreciation deduction for qualifying property acquired and placed in service after January 19, 2025.4Internal Revenue Service. One, Big, Beautiful Bill Provisions
Bonus depreciation applies to tangible property depreciated under MACRS with a recovery period of 20 years or less.5Internal Revenue Service. Instructions for Form 4562 (2025) – Depreciation and Amortization Fences, parking lots, sidewalks, and bridges are 15-year MACRS property, so they fall inside the window. A new parking lot placed in service in 2026 can be deducted in full in year one through bonus depreciation, even though the same asset is barred from Section 179.
How Bonus Depreciation Differs From Section 179
The two tools sound similar. They are not interchangeable, and the differences matter when a land improvement is on the invoice.
- Section 179 cannot exceed your taxable business income for the year. Bonus depreciation has no income limit and can create or increase a net operating loss.
- Section 179 has an annual dollar cap (with a phase-out once total qualifying property placed in service crosses a threshold). Bonus depreciation has no dollar cap.
- When a single asset qualifies for both, Section 179 is applied first, and bonus depreciation can then apply to any remaining basis.
- You can elect a lower bonus depreciation percentage. A 40 percent rate is available as an election for certain property placed in service in the first tax year ending after January 19, 2025, which can help if a full first-year deduction is not useful in your situation.6Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One, Big, Beautiful Bill
The Practical Path for a Land Improvement
Because land improvements cannot use Section 179, the ordering rule rarely matters for them. The typical treatment: identify the improvement as 15-year MACRS property, claim 100 percent bonus depreciation in the first year if you want the full deduction now, or take regular 15-year MACRS depreciation if spreading the deduction is more useful. You elect bonus depreciation (or elect out of it) on Form 4562.5Internal Revenue Service. Instructions for Form 4562 (2025) – Depreciation and Amortization
Mixed Projects: Split the Invoice
Construction projects often bundle land improvements with building improvements on a single invoice. The tax treatment does not follow the invoice — it follows what was actually built.
Consider a commercial renovation that resurfaces the parking lot, installs a new roof, and replaces the HVAC system. The roof and the HVAC unit are qualified real property and can be elected into Section 179. The parking lot cannot; it goes to 15-year MACRS with bonus depreciation available. Ask the contractor to break out the costs by component so each piece is depreciated under the correct rule.
A Note on State Taxes
States do not all follow the federal Section 179 or bonus depreciation rules. Some conform fully, some cap Section 179 at lower amounts, and some require you to add back the federal deduction and depreciate the asset over its normal recovery period on the state return. The federal treatment of a fence or parking lot tells you nothing definitive about the state result, so check your state’s income tax rules before assuming a first-year write-off flows through to your state liability.