The federal rehabilitation tax credit can support the reuse of qualifying historic buildings, but the 20% figure applies only to qualified rehabilitation expenditures and only when the federal requirements are met.
The federal rehabilitation tax credit is the federal income-tax incentive under Internal Revenue Code Section 47 for rehabilitating qualifying historic buildings. It's also commonly called the federal historic tax credit or federal historic rehabilitation tax credit. For a qualifying project, the credit equals 20% of qualified rehabilitation expenditures, or QREs. Under the rules that generally apply to post-2017 expenditures, that credit is allowed ratably over five years beginning with the year the qualified rehabilitated building is placed in service.
That doesn't mean every historic building qualifies, or that 20% of the entire development budget becomes a credit. The building, the rehabilitation, the use, and the expenses all have to satisfy separate federal requirements.
If you're interested in what tax-credit activity can reveal about an emerging project rather than the mechanics of the incentive itself, see Preserve Signal's guide to historic tax credits as a signal of future design and construction work.
What is the federal rehabilitation tax credit?
The program is administered through a federal-state partnership. State Historic Preservation Offices, or SHPOs, are generally the first point of contact and review applications before forwarding them to the National Park Service. NPS makes the federal certification decisions about historic status and whether the rehabilitation meets the Secretary of the Interior's Standards for Rehabilitation. The IRS administers the tax rules, including qualified expenses, claiming the credit, and recapture.
At a high level, a project needs four things: a certified historic structure, a substantial rehabilitation, work that NPS certifies as consistent with the Standards, and a depreciable building used for a business or other income-producing purpose. An owner-occupied private residence doesn't qualify for the federal rehabilitation credit.
Which historic buildings can qualify?
For the 20% credit, the property must be a certified historic structure. A single building that is individually listed in the National Register of Historic Places is already a certified historic structure. A building in a registered historic district generally must be certified by NPS as contributing to the district's historic significance. A Part 1 application is also required for certain individually listed properties with more than one building.
Buildings that aren't yet listed can sometimes enter the process through a preliminary determination of significance, but the federal listing and certification requirements still have to be satisfied. The federal credit applies to buildings, not simply to every resource type that can be listed in the National Register.
The post-rehabilitation use matters too. The building must be depreciable for federal tax purposes, such as commercial, industrial, agricultural, office, hospitality, or rental residential use. That's one reason the credit is closely associated with historic adaptive reuse, even though adaptive reuse by itself doesn't create tax-credit eligibility.
Ownership isn't the only route to the credit. A lessee can claim the credit in certain circumstances, including when the lessee incurs qualifying rehabilitation expenditures. For those expenditures to qualify, the remaining lease term on the date the rehabilitation is completed, disregarding renewal periods, can't be shorter than the applicable federal recovery period, generally 27.5 years for residential rental property and 39 years for nonresidential real property. Separate federal rules can also allow a lessor to elect to treat a lessee as having acquired the property for rehabilitation-credit purposes.
For a broader look at how reuse projects surface before construction, see where historic adaptive reuse projects first appear in public records.
What counts as a qualified rehabilitation expenditure?
The 20% credit is calculated from QREs, not the project's total cost. In general, QREs are capitalized costs incurred in connection with rehabilitating the qualified building and its structural components. Depending on the facts and tax treatment, they can include work on walls, roofs, floors, ceilings, windows, doors, plumbing, electrical systems, HVAC, elevators, sprinkler systems, and other building components. Certain professional and construction-related soft costs, including architectural and engineering fees, can also qualify when the tax requirements are met.
Common nonqualified costs include acquiring the property, enlarging the building, new construction, furniture, landscaping, sidewalks, and parking lots. A cost can also fail to qualify for tax reasons even if the related physical work is acceptable to NPS. That distinction is important: NPS reviews the rehabilitation for preservation certification, while the IRS rules determine whether an expenditure is a QRE.
The project must be substantially rehabilitated
The federal rehabilitation tax credit isn't intended for a small repair project. A building generally satisfies the substantial rehabilitation test when QREs during the applicable measuring period exceed the greater of $5,000 or the building's adjusted basis. The standard measuring period is 24 months. Certain projects that are reasonably expected to be completed in phases can use a 60-month measuring period, but the phasing has to be established before physical rehabilitation begins. Treasury regulations require the phases to be set out in written architectural plans and specifications completed before the work starts; those plans can describe the phases generally and don't need to contain detailed working drawings. The 60-month rule isn't a measuring period that can simply be adopted retroactively after rehabilitation work is underway.
Adjusted basis is a tax calculation, not simply the purchase price. NPS summarizes it using the building and land purchase price, land value, depreciation, and later capital improvements. Owners should have their tax adviser calculate the threshold for the actual ownership and financing structure.
How the federal certification process works
The Historic Preservation Certification Application is organized around three parts, although Part 1 isn't required when the property consists of a single building already individually listed in the National Register:
- Part 1, Evaluation of Significance, establishes or requests the certification needed to treat the building as a certified historic structure.
- Part 2, Description of Rehabilitation, documents the existing condition and proposed work so NPS can evaluate the project against the Secretary of the Interior's Standards for Rehabilitation.
- Part 3, Request for Certification of Completed Work, documents the finished project. NPS approval of Part 3 certifies the completed rehabilitation.
Applications are submitted electronically through the applicable SHPO process and forwarded to NPS with the state's recommendation. NPS makes the federal certification decision. Applicants are strongly encouraged to obtain Part 2 approval before construction begins because proceeding without prior NPS approval is at the owner's risk. If the scope changes during construction, the federal amendment process should be used as required rather than assuming the original approval covers the change.
How the 20% credit is claimed
For current projects, the rehabilitation credit determined for the qualified rehabilitated building is generally allowed in equal shares over five tax years, beginning with the year the building is placed in service. Taxpayers claim the rehabilitation credit using IRS Form 3468, subject to the federal tax rules that apply to the taxpayer and transaction.
The credit also affects depreciable basis. Internal Revenue Code Section 50(c) generally requires the taxpayer to reduce the building's basis by the full amount of the rehabilitation credit determined in the year the property is placed in service, even though the credit itself is claimed ratably over five years. That reduction affects later depreciation deductions. If credit is later recaptured, the basis is increased by the recaptured amount. Certain lessor-to-lessee elections use special income-inclusion rules instead of the ordinary basis reduction.
The five-year period matters after completion too. A disposition or other event that causes the property to cease qualifying as investment credit property during the five-year recapture period can require part of the credit to be recaptured. The amount subject to recapture generally declines as the property remains in service through that period.
Federal and state historic tax credits aren't the same program
Many states have their own historic rehabilitation tax credits, and some projects use state and federal incentives together. State programs can differ significantly in credit percentage, caps, allocation rules, transferability, eligible property types, timing, and application procedures. A project's federal certification doesn't by itself answer every state-credit question.
Financing can also include grants and other public incentives. Preserve Signal's article on historic preservation grants explains why a funding action can be meaningful without proving that a project is fully financed or ready for construction.
Why the federal rehabilitation tax credit matters for project intelligence
The credit can influence the feasibility, design, sequencing, and professional team for a historic rehabilitation. A Part 2 application in particular requires a defined rehabilitation scope, which can make tax-credit activity a useful sign that an owner or developer has moved beyond a purely conceptual idea.
It still isn't a construction notice. A tax-credit project can change, pause, lose financing, or require additional approvals before work reaches the market. For project intelligence, the useful question is how the credit fits with property control, design progress, financing, permits, public approvals, and procurement.
The practical takeaway
The federal rehabilitation tax credit can provide a significant incentive for qualifying income-producing historic buildings, but the headline 20% is only the starting point. The building must qualify, the rehabilitation must be substantial, the work must receive preservation certification, and only qualified expenditures enter the credit calculation. For a real project, the preservation review and the tax analysis need to be handled as related but distinct workstreams.