Historic tax credits

The federal historic rehabilitation tax credit is one of the most valuable incentives in real estate, because it is a credit, not a deduction, a dollar-for-dollar reduction of your tax bill worth 20% of what you spend rehabilitating a certified historic building. Spend $500,000 on a qualifying rehab and you get $100,000 back off your taxes, not off your income. Stack the state historic credits most states offer on top, and the combined credits can offset a third to a half of total project cost. The catch is that the rules are strict, the certification process is bureaucratic, and the credit is now spread over five years rather than taken all at once.

Credit versus deduction, and why 20% is huge

The distinction that makes this worth understanding is credit versus deduction. A deduction reduces your taxable income; a 20% credit reduces your actual tax, dollar for dollar. So the historic credit under IRC Section 47 is worth far more than a 20% deduction would be, it is 20% of your qualified spending coming straight off your tax liability.

Qualified rehabilitation expenditures, QREs, are the hard costs of restoring the building itself plus architectural and engineering fees and construction-period interest and taxes. They do not include the cost of acquiring the building, the land, or any new addition or enlargement, the credit rewards restoring the historic structure, not buying it or expanding it. Since the 2017 tax law, the credit is claimed ratably over five years, 4% of QREs per year, beginning the year the building is placed in service, rather than all in year one. The old 10% credit for non-historic pre-1936 buildings was permanently repealed; only the 20% certified-historic credit remains.

The historic credit is 20% of qualified rehab spending taken directly off your tax bill, not your income, and it is claimed ratably at 4% per year over five years.

The substantial-rehabilitation test and certification

Two gates control eligibility. First, the building must be a certified historic structure, listed on the National Register of Historic Places or contributing to a registered historic district, and it must be income-producing (a rental or commercial property, not your personal residence). The rehabilitation itself must meet the Secretary of the Interior’s preservation standards, which is why a preservation-experienced architect is essential.

Second, the substantial-rehabilitation test: your QREs during a 24-month measurement period (or 60 months for a phased project) must exceed the greater of $5,000 or the building’s adjusted basis at the start, roughly what you paid minus land value and prior depreciation. In plain terms, you generally have to spend more on the rehabilitation than the building’s depreciated structure was worth going in. This is a serious rehab incentive, not a credit for cosmetic touch-ups. The certification runs through a three-part application to the National Park Service via your State Historic Preservation Office, and getting Part 2 approved before you build is critical, because work done outside the approved plan can disqualify the credit.

The building must be a certified historic, income-producing structure, and your rehab spending must exceed the greater of $5,000 or the building’s adjusted basis within a 24-month window to qualify.

The seam with depreciation, and stacking state credits

Here is the cross-discipline point that a single-focus advisor can miss. The historic credit interacts with your depreciable basis: the qualified rehabilitation expenditures that generate the credit also would otherwise be depreciable, and claiming the credit reduces the basis you depreciate. So the credit and a cost-segregation study on the same project have to be coordinated, you are not double-dipping the same dollars, and the interplay of a 20% credit against reduced depreciation needs modeling to see the true after-tax benefit. Done right, a historic rehab can still layer some cost-segregation acceleration on non-QRE components.

And the stacking that makes these projects pencil: most states offer their own historic credits, ranging from 10% to as high as 50% of qualified costs, and they generally stack on top of the federal 20%. In a strong-credit state, the combined federal-plus-state credits can offset a very large share of project cost, which is often what turns an otherwise marginal historic rehab into a viable deal. This is why historic-credit deals cluster in states with generous programs.

Claiming the credit reduces depreciable basis, so it must be coordinated with cost segregation, and stacking state historic credits on the federal 20% can offset a third to a half of total project cost.

The bottom line

• The historic credit is 20% of qualified rehab spending, taken directly off your tax bill as a credit.
• It applies only to certified historic, income-producing buildings meeting preservation standards.
• Qualified expenditures exclude acquisition, land, and enlargements; the credit is claimed 4% per year over five years.
• The substantial-rehabilitation test requires spending more than the building’s adjusted basis within 24 months.
• Claiming the credit reduces depreciable basis, and stacking state credits can offset much of project cost.

For the depreciation it interacts with, read what is cost segregation. For other credits, see energy tax credits. For the full picture, start at the advanced real estate tax strategies hub.

Last verified August 2026.