For real estate investors and business owners, the IRS Section 179 election to expense depreciable assets can turn the cost of certain property into an immediate deduction in the year it is placed in service, instead of depreciating it over several years.

For property owners, the harder questions are what qualifies, whether a rental activity can use Section 179 at all, and who should make the election. This guide covers those eligibility and election questions. If you are deciding between Section 179 and a cost segregation study, or planning to use both, see our comparison of cost segregation and Section 179.

What Is Section 179?

Section 179 of the Internal Revenue Code lets a business elect to deduct the cost of qualifying property in the year it is placed in service, up to an annual limit. It typically applies to tangible personal property used predominantly in a trade or business, such as machinery, equipment, furniture, and off-the-shelf software, and to certain improvements to nonresidential buildings.

Unlike bonus depreciation, Section 179 is never automatic. You choose whether to use it, which assets to apply it to, and how much to expense.

Section 179 Limits for 2025 and 2026

The One Big Beautiful Bill Act more than doubled the Section 179 limits for tax years beginning after December 31, 2024:

If you place more than the phase-out threshold of Section 179 property in service during the year, the maximum deduction is reduced dollar for dollar above that threshold.

Two more limits matter for property owners:

• Business income limit: The deduction cannot exceed your taxable income from the active conduct of a trade or business for the year. Wages count toward this limit. Section 179 cannot create a net operating loss.
• Carryforward: Any amount disallowed by the income limit carries forward to future years as Section 179 expense.

So even a large investment in qualifying property can produce a smaller deduction if business income is limited.

What Property Qualifies?

Most tangible personal property used in a business, such as office furniture, computers, equipment, and certain vehicles, can qualify. Real property, such as buildings and their structural components, generally does not.

The exception is "qualified real property" under Section 179(f). It covers:

• Qualified improvement property (QIP): improvements to the interior of nonresidential real property made after the building was first placed in service, excluding enlargements, elevators, escalators, and internal structural framework.
• Roofs, HVAC property, fire protection and alarm systems, and security systems for nonresidential real property, placed in service after the building itself.

These building-improvement categories apply only to nonresidential property. They do not cover apartments or single-family rentals.

Can You Take Section 179 on Rental Property?

Sometimes, but rental owners face hurdles that other businesses do not.

1. The rental must be a trade or business

Section 179 property must be used in the active conduct of a trade or business. A rental can meet this standard when you are regularly involved in running it, for example by making management decisions, directing repairs, marketing vacancies, and handling tenant relations. A triple-net lease where you have minimal involvement typically will not qualify.

2. Lodging property is no longer automatically excluded

For tax years beginning after 2017, property used predominantly to furnish lodging, such as appliances, furniture, and carpeting in a rental unit, is no longer automatically excluded from Section 179. IRS Publication 946 lists certain lodging-related property as eligible. Older guidance that says residential rental furnishings never qualify reflects the pre-2018 rules.

3. Noncorporate lessor rules can still block the deduction

If you are an individual, or own through another noncorporate structure, and you lease property to others, Section 179 is generally not available for that leased property unless specific tests are met. The tests depend on the lease term relative to the property's class life and on the size of your business expenses compared with rental income. This rule often decides whether a landlord can use Section 179, so confirm it with your CPA before planning around the deduction.

4. What this means in practice

• Commercial property owners who operate a trade or business may be able to expense QIP, roofs, HVAC, fire protection, and security systems, subject to the income limit and lessor rules.
• Residential rental owners cannot use the Section 179(f) building-improvement categories, and appliances and furnishings depend on the trade-or-business and lessor tests.
• Many residential owners find that bonus depreciation through a cost segregation study is the more broadly available tool, because it does not depend on business income or the lessor rules. Our cost segregation vs. Section 179 guide explains how the two work together.

How the Section 179 Election Works

• It is made asset by asset. You decide which qualifying property to expense and how much of its cost to elect.
• It is made on Form 4562. The election is reported in Part I of Form 4562 with your return.
• It can be changed. Under current law, a Section 179 election can generally be made, changed, or revoked on an amended return for the year, without IRS consent.
• State treatment varies. Some states limit Section 179 well below the federal amounts, so the federal and state results can differ.
• Business use matters after the election. If business use of the property drops to 50% or less in a later year, part of the deduction can be recaptured as ordinary income.

Because the election interacts with your income, other elections, and future plans, the timing and amount are best decided by your CPA.

Why R.E. Cost Seg Does Not Include 179 Election Recommendations in Our Studies

At R.E. Cost Seg, we focus on delivering detailed, well-documented cost segregation studies. We provide a comprehensive breakdown of your assets, including placed-in-service dates, basis, and recovery periods, which makes it easier to identify eligible 1245 property that could be considered for Section 179 expensing.

We refrain from making direct recommendations on Section 179 because we believe this decision is best made by the CPA, who completely understands the client’s overall tax situation. This includes factors such as the client’s investment limits and any other Section 179 elections, which we may not be aware of since our review focuses on a single property.

The decision to elect Section 179 is deeply tied to broader tax implications, including other deductions, income limitations, and future business planning. Your CPA has a holistic view of your finances and can help you make the right choice.

Key Takeaways

1. Section 179 is an elective, immediate deduction for qualifying property placed in service during the year.
2. Limits are year-specific: $2,500,000 with a $4,000,000 phase-out threshold for 2025, and $2,560,000 with a $4,090,000 threshold for 2026. The deduction also cannot exceed business income.
3. Building improvements qualify only for nonresidential property: QIP, roofs, HVAC, fire protection and alarm, and security systems.
4. Rental property is possible but not automatic. The rental must be a trade or business, and noncorporate lessor rules can block the deduction. Lodging property is no longer automatically excluded.
5. Your CPA should make the election decision. It depends on your entire tax picture, not on a single property.

At R.E. Cost Seg, we aim to provide the data you need for your tax planning, without making assumptions about your overall tax strategy. We believe your CPA, armed with our detailed asset breakdown, can help you make the best decision when it comes to electing Section 179 expensing.

Final Thoughts

Section 179 can reduce your tax in the right circumstances, but for rental property owners eligibility depends on how the property is used and owned. With guidance from your CPA and the asset detail in a cost segregation study, you can decide whether the election fits your situation. Reach out to us today to see how a cost segregation study can benefit your real estate investments.