Section 179 and 179D: What Should Roof Owners Do Before December 31?
By Sam Pipiras, Director of Commercial Development · Published October 2026 · 6 min read
Late in the fourth quarter, the roof on your CapEx list starts to look different. If a tax deduction is on the table, timing matters, and a roof project that is not finished by the end of the year may land in the next one. This is a deadline checklist for owners and CFOs. We are a roofing contractor, not tax advisors, so every point below is something to confirm with your CPA.
Quick Answer
Section 179 generally allows qualifying property to be expensed in the year it is placed in service, and roofs on nonresidential real property may qualify. Residential rental property, which includes most apartment buildings, generally does not. Section 179D was ended by the 2025 federal tax law for buildings whose construction begins after June 30, 2026, so do not plan around it. The practical move is to inspect, scope and contract early, then ask your CPA to confirm treatment for your entity and property.
What Does Section 179 Generally Cover for Roofs?
Section 179 lets a business deduct the cost of certain qualifying property in the year it is placed in service instead of depreciating it over many years. A roof on a nonresidential building, such as an industrial building, a retail strip, an office or a school, may fall within the types of improvements that qualify. Whether your project does, and how much you can deduct, depends on your entity, your income and the limits for the year.
That last part is the CPA's call. We bring the scope, the dates and the documentation, and your advisor decides how it is treated.
Does the Roof Have to Be Finished by December 31?
The question to ask your CPA is what "placed in service" means for your project. In general terms, the property needs to be ready and available for its intended use by the end of the tax year, not just contracted or deposited. For a roof, that usually points to substantial completion, not a signed proposal.
That is why this is a scheduling question as much as a tax question. Late-season roofing depends on temperature, adhesive and sealant requirements, and the weather, so a project started in December can slip into January. If the deduction matters to you, the time to act is now, not after Thanksgiving.
What Happened to Section 179D?
Section 179D is the energy efficient commercial building deduction. The 2025 federal tax law ended it for buildings whose construction begins after June 30, 2026. If you read older articles that mention 179D as a year-end roof lever, check the date on them. Ask your CPA whether any 179D treatment applies to your property at all, and treat it as unavailable for planning unless they tell you otherwise.
Which Properties Does This Not Fit?
Section 179 for roofs generally applies to nonresidential real property. Residential rental property, which covers most multifamily, is generally outside it. Owners of apartments, condos and townhome communities should not assume the deduction applies and should ask before building a plan around it. Mixed-use buildings can be more complicated, and an owner with several entities may find that the same roof is treated differently depending on who holds title.
What Should You Do Before December 31?
Work backward from the date your roof has to be complete:
- Get the roof inspected now. Photos, drone views, moisture readings where used, and core samples tell you what the roof needs, so the scope is based on evidence.
- Pick the scope. Repair, coating, recover or full replacement are different projects with different tax treatment. Your CPA will want to know which one it is.
- Ask your CPA the three questions. Does this property qualify, how is this scope classified, and what completion date do you need.
- Get the contract signed and the materials ordered early. Lead times and weather are the usual reasons a year-end project slips.
- Keep the paperwork. The invoice, the scope, the completion date and photos of the finished work are what your advisor will ask for.
For a longer-range view of the budget side, read our 2027 CapEx planning guide. This post is the deadline checklist; that one is the planning framework.
Repair or Capital Project: Does the Difference Matter?
Yes, and it is another reason to define scope early. A repair and a capital improvement are often treated differently, and a recoat, a recover and a tear-off sit in different places on that line. We write scopes that say clearly what is being done and where. If you need a replacement or recover on a building you plan to hold, our commercial roofing team can build the timeline around your year-end date.
Frequently Asked Questions
It may be possible for a roof on nonresidential real property, depending on your entity, income and the limits for the year. The answer depends on your facts, so confirm treatment with your CPA before relying on it.
Generally no. Residential rental property is typically outside Section 179 for roofs. Owners of multifamily properties should ask their CPA before assuming any year-end deduction applies.
The 2025 federal tax law ended Section 179D for buildings whose construction begins after June 30, 2026. Do not plan a roof project around it, and ask your CPA whether anything applies to your existing building.
Generally it means the work is complete and the roof is ready for use by the end of the tax year. A signed contract or deposit alone is typically not enough. Ask your CPA how they want completion documented.
There is no single date. Weather, material lead times and project size all matter, and late-season work can slip. If the year-end date is important, get an inspection and a scope in hand as early as you can.