Does a New Roof Qualify for Section 179? Limits and Recapture

Yes, a new roof does qualify for a Section 179 deduction, provided the building is nonresidential and the roof replaces or improves the existing structure rather than being installed as part of the original build. The Tax Cuts and Jobs Act added roofs to the list of qualified real property under IRC Section 179(e), and the One, Big, Beautiful Bill Act signed in 2025 raised the base deduction ceiling to $2,500,000, which inflation-adjusts to roughly $2,560,000 for the 2026 tax year.¹ The deduction is generous, but it comes with income limits, eligibility carve-outs, and recapture rules worth understanding before you claim it.

What Kind of Roof Actually Qualifies

Section 179(e)(2) lists roofs as qualified real property eligible for immediate expensing.¹ Before the 2017 change, a full roof replacement on a commercial building had to be depreciated across 39 years. A $200,000 roof that would have produced about $5,100 per year in depreciation now delivers a $200,000 deduction in the year it’s placed in service.

Two distinctions matter. First, the building must be nonresidential real property. Apartment buildings, rental houses, condominiums, and similar residential structures are excluded. Warehouses, offices, retail spaces, and medical facilities are the target. Mixed-use buildings require an allocation between the business and residential portions, and the math gets complicated fast.

Second, the roof has to go on an existing building. A brand-new building’s original roof does not qualify. The deduction is aimed at improvements and replacements on structures that were already operating for their business purpose before the roofing work began.

Repairs and replacements are treated differently. Patching a few leaks or fixing a small area of storm damage is typically an ordinary business expense under Section 162. A full tear-off and new roofing system is the capital improvement Section 179 is designed for. The roofing material itself doesn’t drive eligibility.

Home Offices and Rental Property Landlords

A home office does not open the door. IRS Publication 587 states that a taxpayer cannot claim a Section 179 deduction for the business portion of a home.² The business-use share of a new roof on that home is depreciated over its recovery period instead.

Noncorporate landlords face their own barrier. An individual (not a corporation) who buys property and leases it to someone else generally can’t use Section 179 unless the taxpayer manufactured the property or the lease term runs less than half the property’s class life and meets a minimum expense-to-rent threshold.³ For most noncorporate landlords leasing out commercial buildings, that rule effectively blocks the deduction on a new roof.

Dollar Limits and Phase-Out for 2026

The One, Big, Beautiful Bill Act permanently lifted the Section 179 ceiling, with a $2,500,000 base for 2025 that is indexed for inflation. For 2026, the maximum deduction is approximately $2,560,000, and the phase-out begins at roughly $4,090,000 in total qualifying property purchases for the year.

The phase-out is dollar for dollar. Every dollar of qualifying purchases over the threshold reduces the maximum deduction by a dollar, which zeroes out the deduction near $6,650,000 in total purchases. Most small and mid-sized commercial roof projects sit well below these caps.

The Taxable Income Cap Catches People Off Guard

Even when a roof costs far less than the dollar limit, a second ceiling applies: the Section 179 deduction cannot exceed the total taxable income you earned from actively running your businesses during the year.¹ Section 179 cannot create or increase a net operating loss.

Say the roof cost $300,000 and the business generated $180,000 in taxable income. The deduction this year is $180,000. The remaining $120,000 isn’t gone. It carries forward indefinitely and can be used in any future year with enough business income to absorb it, subject to that year’s limits.⁴ Owners who had a slow year often assume the full deduction will wipe out their tax bill and are surprised to find the income limit shrank it.

Section 179 or Bonus Depreciation

The two mechanisms both produce first-year write-offs, but they don’t cover the same property. The One, Big, Beautiful Bill Act restored permanent 100% bonus depreciation for qualified property acquired after January 19, 2025.⁵ Bonus depreciation, though, applies to qualified improvement property, which the IRS defines as improvements to the interior of a nonresidential building. A roof is not an interior improvement. That single fact usually settles which tool applies: Section 179 for the roof, bonus depreciation for any interior work done alongside it.

A few other differences shape planning:

Bonus depreciation can generate a net operating loss; Section 179 cannot. If your business income is thin relative to the project cost, bonus depreciation on other assets may be more useful.
Section 179 lets you pick which assets to expense and how much of each cost to elect. Bonus depreciation applies to the entire asset class unless you elect out of the class.
Section 179 has the dollar cap and phase-out. Bonus depreciation has no dollar limit.
Noncorporate landlords locked out of Section 179 may still use bonus depreciation on eligible interior improvements, but not on the roof itself.

Recapture If You Sell or Change How You Use the Building

A large first-year deduction plants a possible tax bill down the road. If business use of the building drops below 50% before the end of the property’s recovery period, part of the Section 179 benefit has to be recaptured as ordinary income.⁶ The recapture amount is the difference between what you deducted under Section 179 and what regular depreciation would have produced over the same period, added back to income in the year the use changes. Recapture from a business-use decline is reported on Form 4797, Part IV.⁷

Selling the building triggers a separate mechanism. Gain on the sale of Section 179 property is subject to Section 1245 recapture, which taxes the gain as ordinary income up to the amount of the Section 179 deduction previously claimed.⁸ Deducting $250,000 for a roof and later selling at a gain can convert up to $250,000 of that gain from capital gain to ordinary income. The deduction still delivered years of tax savings, but a sale on the horizon changes the calculation.

How to Claim the Deduction

Section 179 is claimed on Form 4562, which handles depreciation and amortization. In Part I, Line 6, enter a description of the roofing property and the cost allocable to business use.⁹ The subsequent lines apply the dollar cap and the taxable income limitation.

Before filing, pull together:

All invoices for materials, labor, permit fees, and related project expenses.
The placed-in-service date, meaning the specific date the roof became fully functional, not the contract date or deposit date.
The business-use percentage if the building serves any non-business purpose, since only that share qualifies.

Form 4562 attaches to your primary return. C corporations file with Form 1120,¹⁰ partnerships and multi-member LLCs with Form 1065, S corporations with Form 1120-S, and sole proprietors and single-member LLCs through Form 1040 with the appropriate schedules.¹¹

Timing and the Election

The deduction must be claimed for the year the roof is placed in service. You make the Section 179 election on your original return for that year, identifying the property and the amount elected.¹ You can revoke the election later, but a revocation is permanent — you can’t reinstate it. Missing the election on the original return is a real problem, since the IRS has limited tolerance for late Section 179 elections. Keep the filed return and every receipt tied to the roof for at least as long as the building’s recovery period; audits and recapture calculations both reach back years.

State Tax Treatment May Differ

A federal Section 179 deduction doesn’t automatically translate on the state return. Some states fully conform to the federal rules. Others cap the state-level deduction at a lower amount, require add-back adjustments for the difference, or decouple from the qualified real property provisions entirely. Check your state’s current conformity status before assuming the full federal deduction reduces your state tax bill by the same amount.

1
Office of the Law Revision Counsel. 26 USC 179 – Election to Expense Certain Depreciable Business Assets
2
Internal Revenue Service. Publication 587 (2025) – Business Use of Your Home
3
Office of the Law Revision Counsel. 26 US Code 179 – Election to Expense Certain Depreciable Business Assets
4
eCFR. 26 CFR 1.179-3 – Carryover of Disallowed Deduction
5
Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One, Big, Beautiful Bill
6
eCFR. 26 CFR 1.179-1 – Election to Expense Certain Depreciable Assets
7
Internal Revenue Service. Instructions for Form 4797
8
Office of the Law Revision Counsel. 26 US Code 1245 – Gain From Dispositions of Certain Depreciable Property
9
Internal Revenue Service. 2025 Instructions for Form 4562 – Depreciation and Amortization
10
Internal Revenue Service. About Form 1120 – US Corporation Income Tax Return
11
Internal Revenue Service. LLC Filing as a Corporation or Partnership