What is the Section 179 expensing limit for 2026?

What is the Section 179 expensing limit for 2026?

The Section 179 expensing limit for 2026 is $1,220,000, so you can deduct the full cost of a new rooftop HVAC unit placed in service that year.

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The specifics

The IRS sets the Section 179 limit annually; for 2026 it’s $1,220,000 IRS. Any new rooftop HVAC unit you purchase or finance that you install and activate before the end of 2026 can be fully expensed, subject to the dollar cap. If you buy multiple pieces of equipment, the total cost of all qualifying purchases cannot exceed the limit; the remaining amount is placed on a 5‑ or 7‑year modified accelerated cost recovery schedule (MACRS) IRS. The rule applies regardless of whether you pay cash or secure an equipment loan, but you must own the unit and it must be in active use in the same tax year.

Key eligibility criteria

• Tangible personal property used in an active trade or business is eligible; real property, land, and the building itself are excluded SBA.
• The equipment must be new or purchased as new. Used equipment generally does not qualify, unless it is newly manufactured or otherwise “new” to you.
• Placed in service means the unit is installed and operational. Purchasing in December 2026 and installing in January 2027 would shift the deduction to 2027.
• The $1,220,000 limit is a dollar ceiling; you may expense up to that amount. Anything beyond is depreciated under MACRS.

Financing the unit does not affect eligibility. If you secure a loan with an average 9–12% APR available today for equipment, you can still claim the full deduction, which effectively reduces your taxable income and improves cash flow, making the loan easier to service. Financial institutions often accept a soft pull credit check—no impact on your score—so you can see rates in 2 minutes without affecting your credit profile. For an instant assessment, try the affordability calculator.

Qualification & edge cases

• High‑cost purchases: Should your business spend more than the $1,220,000 limit in a single year, the IRS requires you to take the deduction on the first limit‑sized portion and depreciate any excess. You might prioritize high‑duty units that will bring the most benefit.
• Used equipment: Routine refurbishment or re‑branding often doesn't reset the “new” status. Consult a tax adviser to verify whether a used rooftop unit sold as “new” qualifies.
• Timing: Works‑in‑progress items that aren't fully installed by year‑end can’t be deducted until the next tax year. Communicate with your installer to schedule the completion for 2026 if you want the deduction now.
• Multiple locations: If you own several facilities, you can claim Section 179 expensing separately for each unit, but the overall limit still applies to the combined total cost across all units for that year.

Background & how it works

Section 179 was created in 1981 to spur small‑business investment by allowing an immediate write‑off of qualifying equipment. The Tax Cuts and Jobs Act of 2017 greatly expanded the available deduction, raising the dollar limit and prolonging the 5‑ and 7‑year depreciation classes. For HVAC systems, the IRS classifies new rooftop units as 5‑year property under MACRS, meaning without Section 179 you would recover the cost over five years by annual depreciation. The Section 179 provision collapses that schedule into a single‑year deduction, which can significantly lower your taxable income in the same calendar year.

When financed, the interest payments on the loan are also deductible as a business expense, further reducing taxable income. Combined, these tax advantages can improve cash flow and accelerate return on investment for small‑business owners who need to upgrade their climate control systems.

Optionally, you may also explore leasing alternatives. Leasing does not qualify for Section 179 because you do not own the equipment; however, lease payments may be deducted as operating expenses.

In Louisville, KY, owners often choose suitable capital solutions—equipment financing, working‑capital lines, or SBA 504 loans—to balance cost and speed. See the HVAC capital path in Louisville for detailed options.

Bottom line

If you plan to replace or upgrade a rooftop HVAC unit in 2026, you can fully expense its cost—up to $1,220,000—by placing it in service that year. Use the quick affordability calculator to estimate your deduction and see if you qualify for fast, low‑APR financing today.

Disclosures

This content is for educational purposes only and is not financial advice. rooftopunit‑financing.com may receive compensation from partner lenders, which may influence which products are featured. Rates, terms, and availability vary by lender and applicant qualifications.

Sources

• IRS
• SBA
• Bankrate