Yes, HVAC work is generally Qualified Improvement Property when it upgrades the interior of an existing nonresidential building, and that classification matters because QIP has a 15-year depreciation life instead of 39 years. For systems placed in service after January 19, 2025, QIP is once again eligible for 100% bonus depreciation under the One Big Beautiful Bill Act, so the full cost can be deducted in the year the system goes into service.1Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill Not every HVAC dollar automatically qualifies, though, and the exclusions are specific.
The Three Tests HVAC Has To Pass
Qualified Improvement Property is defined in Section 168(e)(6) of the Internal Revenue Code. An HVAC expenditure qualifies only if it meets all three of the following:
- It improves an interior portion of a building that is nonresidential real property, such as an office, warehouse, or retail store.
- You are the taxpayer paying for the improvement. A prior owner’s HVAC upgrades don’t transfer to you as QIP.
- The work is placed in service after the building itself was first placed in service by any taxpayer.
The statute also carves out three categories that can never be QIP no matter how the invoice reads: expenditures tied to enlarging the building, installing or replacing an elevator or escalator, or modifying the building’s internal structural framework. When HVAC work clears those hurdles, it becomes 15-year MACRS property instead of falling into the 39-year class that applies to most nonresidential real property.2Office of the Law Revision Counsel. 26 U.S. Code 168 – Accelerated Cost Recovery System
HVAC Work That Clearly Qualifies
Interior HVAC work is the strongest case for QIP. Replacing an air handler inside a commercial office, running new ductwork through a warehouse, or upgrading thermostats and zone controls within the building envelope all improve the interior of an existing structure. Provided the building was already in service before the project began, these costs meet the definition and get the 15-year recovery period.
HVAC Work That Doesn’t Qualify
Rooftop units sit in a gray area. A rooftop condenser or packaged unit lives outside the building envelope, so under the statute’s literal text it may not count as an improvement to the “interior portion” of the building. Some practitioners argue that because the unit conditions the interior, it should qualify; others take the view that physical location controls. The dispute matters less than it once did because Section 179 separately covers HVAC property, but it can still determine whether bonus depreciation reaches that specific component.
New-construction HVAC is never QIP. If you add a wing onto your warehouse and install HVAC in the new space, the entire cost falls into the enlargement exclusion and depreciates over 39 years. The same is true for HVAC in a brand-new building, because there’s no pre-existing structure for the improvement to follow.
Residential rental property is also outside the definition. QIP applies only to nonresidential real property, so HVAC work in an apartment complex doesn’t qualify no matter how extensive the project is.
Mixed projects need to be split. Replacing interior ductwork and an exterior condenser under the same contract requires allocating the invoice so the qualifying portion gets the faster write-off and the rest follows its appropriate recovery period. Contractor documentation that separates interior from exterior labor and materials makes that allocation defensible.
What Qualifying As QIP Gets You Right Now
For QIP acquired after January 19, 2025, the One Big Beautiful Bill Act provides a permanent 100% first-year depreciation deduction.1Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill An HVAC replacement placed in service in 2026 that meets the QIP definition can be fully deducted in the year it’s completed, with no cap on the dollar amount. Bonus depreciation can even create a net operating loss that carries forward to offset income in later years.
One narrow gap: HVAC placed in service between January 1 and January 19, 2025 is still on the old phase-down schedule at 40%. Work completed in that window keeps the lower rate. Anything placed in service after January 19, 2025 gets the full 100%.1Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill
Section 179 When HVAC Doesn’t Fit QIP
HVAC work that falls outside the QIP definition may still be eligible for immediate expensing under Section 179. Congress specifically listed heating, ventilation, and air-conditioning property as “qualified real property” for Section 179 purposes, alongside roofs, fire protection and alarm systems, and security systems.3Office of the Law Revision Counsel. 26 U.S. Code 179 – Election to Expense Certain Depreciable Business Assets That’s why Section 179 catches HVAC that doesn’t meet the interior-improvement test, including rooftop units.
For tax years beginning in 2026, the maximum Section 179 deduction is $2,560,000. The ceiling begins to phase out dollar-for-dollar once total qualifying property placed in service during the year exceeds $4,090,000.4Internal Revenue Service. Revenue Procedure 2025-32 Unlike bonus depreciation, Section 179 can’t create a net operating loss; the deduction is capped at the taxpayer’s taxable income from all active trades or businesses for the year.
Section 179 and bonus depreciation can be combined. A taxpayer can elect Section 179 on part of the cost and apply bonus depreciation to the remaining basis. For most owners with clean QIP-eligible HVAC work, bonus depreciation is simpler because it has no dollar cap and no income limitation.
Why The Method You Pick Matters At Sale
Writing off the full cost in year one feels like a windfall, but every dollar of depreciation creates a potential tax bill when you sell. The rate depends on which deduction you used.
QIP depreciated through bonus depreciation is treated as Section 1250 property. On sale, the depreciation is recaptured as “unrecaptured Section 1250 gain,” which tops out at 25%.
QIP expensed under Section 179 is treated as Section 1245 property, meaning the full amount of depreciation is recaptured as ordinary income on sale.3Office of the Law Revision Counsel. 26 U.S. Code 179 – Election to Expense Certain Depreciable Business Assets Ordinary rates can run above 37%. On a $200,000 HVAC system, the gap between 25% and 37% recapture is $24,000 in additional tax. Owners who plan to hold the building and eventually sell should weigh that cost before defaulting to Section 179.
The 163(j) Election That Blocks Bonus Depreciation
Real estate businesses carrying significant debt often elect to be treated as an “electing real property trade or business” under Section 163(j)(7)(B). The election lets you deduct all of your business interest expense without the 30% adjusted taxable income cap.
The price is steep for HVAC planning. The election requires you to depreciate QIP under the Alternative Depreciation System, which stretches the recovery period from 15 to 20 years and uses straight-line depreciation. ADS property is also ineligible for bonus depreciation. A $500,000 interior HVAC replacement that would otherwise be fully deductible in year one instead gets spread over 20 years of equal deductions.
Whether the trade-off makes sense depends on the size of your interest expense relative to your depreciable asset base. Businesses with large mortgages and modest annual improvement budgets usually come out ahead with the full interest deduction. Capital-intensive renovators spending heavily on QIP-eligible work may find the lost bonus depreciation outweighs the interest benefit. The election applies for the life of the business, so run both scenarios with real numbers before making it.
Reporting And Documentation
All depreciation deductions for QIP, including bonus depreciation and Section 179 elections, are reported on IRS Form 4562.5Internal Revenue Service. About Form 4562, Depreciation and Amortization The form asks for the property class, placed-in-service date, cost basis, and depreciation method for each asset or group of assets.
Hold onto contractor invoices that separate interior work from exterior work, identify the building address and placed-in-service date, and confirm that the project did not enlarge the structure. When you’re splitting costs between QIP and non-QIP components, the paperwork should make the allocation traceable. Misclassifying a 39-year improvement as 15-year QIP accelerates the deduction by decades, so it’s exactly the kind of error that draws audit attention. The upside of getting it right is just as large: a $400,000 HVAC replacement that qualifies as QIP and is fully deducted in year one delivers a federal tax reduction north of $80,000 for a business in the 21% corporate bracket.