Historic Tax Credit — Rehabilitation of Historic Buildings

The federal Historic Tax Credit (26 U.S.C. § 47) provides a 20% tax credit for the qualified rehabilitation of certified historic structures — buildings listed on the National Register of Historic Places or located in registered historic districts. Since its creation in 1976, the HTC has been the most effective federal incentive for preserving historic buildings while putting them back to productive use — financing the rehabilitation of over 47,000 historic buildings and generating over $130 billion in private investment. The credit works like this: if you spend $1 million on a qualified rehabilitation of a certified historic building, you receive a $200,000 federal tax credit (claimed over 5 years at $40,000/year since the Tax Cuts and Jobs Act of 2017). The rehabilitation must be substantial (exceeding the building's adjusted basis or $5,000, whichever is greater) and must meet the Secretary of the Interior's Standards for Rehabilitation — ensuring that the rehabilitation preserves the building's historic character. The HTC is frequently combined with the LIHTC to create affordable housing in historic buildings.

Current Law (2026)

Legal Authority

• 26 U.S.C. § 47 — Rehabilitation credit (20% credit for qualified rehabilitation expenditures on certified historic structures; building must be a certified historic structure; rehabilitation must be substantial; expenditures must be certified as consistent with the historic character of the building; credit claimed ratably over 5-year period)

How It Works

The HTC requires a three-part certification process administered by the National Park Service (NPS) in partnership with State Historic Preservation Officers (SHPOs) under 36 CFR Part 67. Part 1 certifies that the building is a historic structure — listed on or eligible for the National Register. Part 2 certifies that the proposed rehabilitation plan is consistent with the historic character of the building. Part 3 certifies that the completed rehabilitation matches the approved plan. The 10 Secretary's Standards for Rehabilitation govern what qualifies: use the property for its historic purpose or compatible new use, retain distinctive features rather than removing them, repair rather than replace deteriorated historic materials, make new additions distinguishable from original construction, and ensure new work is reversible. Qualified rehabilitation expenditures (QREs) under 26 U.S.C. § 47 include structural work, mechanical systems (HVAC, plumbing, electrical), walls, floors, ceilings, and windows — but not land, acquisition costs, building additions, furniture, or site improvements. The rehabilitation must be substantial: total QREs must exceed the building's adjusted basis or $5,000.

The Tax Cuts and Jobs Act of 2017 changed the credit from a single-year claim to a 5-year ratable claim — 4% per year for 5 years — reducing the credit's present value and triggering ongoing advocacy to restore the pre-TCJA structure. TCJA also eliminated the 10% credit for pre-1936 non-historic buildings. The most powerful HTC application pairs it with the Low-Income Housing Tax Credit (LIHTC): developers rehabilitate certified historic buildings into affordable housing, claiming both the 20% HTC for the historic rehabilitation and the LIHTC for the affordable units. This combination can cover 60–80% of total development costs, making projects viable that neither credit could support alone — turning historic school buildings, warehouses, factories, and hotels across America into affordable apartments.

How It Affects You

If you own a historic building and are planning a major rehabilitation: The HTC can cut your rehabilitation cost by 20% of qualified expenditures — but only if you structure the project correctly from the start. The three critical requirements: (1) the building must be a certified historic structure (listed on the National Register or eligible for listing), (2) the rehabilitation must be substantial (QREs must exceed the building's adjusted basis or $5,000), and (3) the work must meet the Secretary of the Interior's Standards for Rehabilitation. Contact your State Historic Preservation Office (SHPO) before finalizing your project design — the Part 2 review (approval of your rehabilitation plan) must happen before work begins. Work done before certification approval may not qualify as QREs. SHPO contact information and the NPS online certification portal are at nps.gov/subjects/historictaxcredits/how-to-apply. The 20% credit is claimed ratably over 5 years (4% per year), so a $500,000 rehabilitation yields $100,000 in credits claimed at $20,000/year for 5 years — reducing your federal income tax bill over that period. Keep the building in income-producing use; the HTC does not apply to owner-occupied residences.

If you're a real estate developer or preservation finance professional: The HTC's power is in stacking. A HTC + LIHTC combination (20% federal historic credit plus 4% or 9% low-income housing tax credits) can cover 60–80% of total development costs for qualifying projects, making previously infeasible affordable housing projects in historic buildings viable. New Markets Tax Credits (NMTCs) from CDFI Fund add another layer for projects in distressed census tracts. State historic credits (available in 35+ states at 10–50% of QREs) stack on top of the federal 20%. The HTC syndication market — where tax credit investors buy the credit at $0.85–$0.95 per dollar of credit — is mature; national syndicators include Raymond James, Raymond James Tax Credit Funds, Boston Capital, and National Partnership Investments. NPS certification delays (currently 6–18 months for Part 2 and Part 3 reviews) are the primary project scheduling risk; build in buffer time, especially post-DOGE where NPS staffing has been under pressure.

If you're a tax credit investor or corporate investor: HTC investments offer a 20% return on QREs claimed over 5 years, structured as a limited partnership or LLC equity investment. Unlike LIHTC where the IRS requires a 10-year holding period to avoid recapture, HTC has a 5-year recapture period — if the building is sold or ceases to be a qualified rehabilitated building within 5 years of being placed in service, the credit is subject to recapture at a declining rate (20% per year reduction). After 5 years, the credit is fully vested. Banks and insurance companies seeking CRA credit often invest in HTC deals in their assessment areas. Direct investment (rather than syndicated fund) avoids fund management fees but requires in-house underwriting capacity for NPS certification risk and construction completion risk. The Historic Tax Credit Coalition (historictaxcredit.com) publishes market data and investor guidance.

If you're a community development organization or local government: The HTC is a market-rate tool that works through the tax equity market — public entities don't receive the credit directly. But cities and CDCs can use HTC as leverage: a municipally owned historic building contributed to a developer partnership can generate HTC equity that funds rehabilitation while the city retains the ultimate ownership or ground lease. Many downtown revitalization initiatives in smaller cities have used HTC to rehabilitate historic commercial buildings on Main Street into mixed-use retail and residential. Community Development Block Grants (hud.gov/program_offices/comm_planning/cdbg) are frequently paired with HTC for gap financing on challenging projects. If you're trying to catalyze historic preservation in your community, the NPS's Technical Preservation Services publishes the Standards and interpretive guidelines for free at nps.gov/tps.

State Variations

Federal HTC works alongside state historic credits:

• Over 35 states offer their own state historic tax credits, ranging from 10% to 50% of QREs
• State credits are often stackable with the federal credit, significantly improving project economics
• State SHPO offices administer the federal Part 1-3 certification process
• State historic preservation enabling legislation and National Register nomination processes vary
• Local historic district designations may qualify buildings for the federal credit (if the district is also National Register-listed)

Implementing Regulations

• 26 CFR 1.47-1 through 1.48-12 — IRS rehabilitation tax credit regulations: qualified rehabilitation expenditures, certified historic structures, phased rehabilitation, the 5-year credit claiming period, recapture rules, and what work qualifies for the credit — the primary IRS regulatory framework interpreting 26 U.S.C. § 47

• 36 CFR Part 67 — Historic Preservation Certifications Under the Internal Revenue Code: the NPS regulations governing the three-part certification process:

  • § 67.4 — Part 1 (historic significance): certifies the property is a "certified historic structure" — listed on the National Register, contributing to a registered historic district, or eligible for individual listing; non-contributing properties in districts qualify only for the 10% credit for pre-1936 buildings
  • § 67.6 — Part 2 (project approval): NPS approves proposed plans before work begins; plans must demonstrate the rehabilitation is consistent with historic character; work begun before Part 2 approval may be disqualified from QRE calculation even if NPS would have approved the work; submit Part 2 before breaking ground
  • § 67.7 — Secretary's Standards for Rehabilitation (10 Standards): the substantive certification criteria — preserve historic fabric, repair rather than replace, differentiate new from old, make new work reversible; applied case-by-case for each project; the original windows rule (replace only when repair is impossible) is the most frequently contested standard
  • § 67.6(f) — Part 3 (completed work): after completion, owner documents that work matches Part 2 approved plans; NPS reviews photos and documentation; differences from approved plans may result in denial or correction requirements; required before the credit can be claimed on Form 3468
  • § 67.10 — Appeals: owners may appeal NPS certification denials within 30 days to the Keeper of the National Register
  • § 67.11 — Fees: project-cost-based fees for NPS review ($200–$5,000+ depending on project scale); SHPO fees are separate and vary by state

  The three-part certification is the earned element of the HTC — unlike a simple tax deduction, the owner must demonstrate NPS approval of both the plan and the completed work before claiming the credit. NPS's four regional offices handle federal review after initial SHPO processing. The fee schedule is updated periodically by Federal Register notice; an electronic submission system was implemented at nps.gov in 2018. Recent guidance: NPS publishes Preservation Briefs covering specific rehabilitation topics (windows, roofs, masonry, storefronts) that clarify how the Standards apply to common building elements.

• IRS Form 3468 — Investment Credit computation: the IRS form used to compute and claim the historic rehabilitation tax credit, along with the required NPS certification documentation that must be attached to substantiate the claim

Pending Legislation

Historic tax credit expansion provisions appear in broader tax and historic preservation legislation. See Historic Preservation and Tax Credits & Deductions.

Recent Developments

The Historic Tax Credit Coalition has advocated for reversing the TCJA's 5-year ratable claiming requirement (returning to the pre-2018 one-year claim), increasing the credit rate to 30% for small projects, and expanding eligibility. The Bipartisan Infrastructure Law and Inflation Reduction Act did not include HTC provisions, though energy efficiency incentives in the IRA can be combined with HTC projects. NPS has modernized its certification process with an online application system. The combination of HTC with Opportunity Zone investments has created new financing structures for historic rehabilitation in designated low-income census tracts. See also Historic Preservation & Antiquities for the broader preservation framework and Community Development Block Grants for complementary federal funding often paired with HTC projects. Rising construction costs have challenged HTC project economics, as the 20% credit rate hasn't been adjusted even as rehabilitation costs have increased significantly.

• Historic Tax Credit Enhancement Act introduced in 119th Congress: The Historic Tax Credit Enhancement Act — a perennial bipartisan bill — was reintroduced in 2025, proposing to increase the credit rate from 20% to 30% for projects involving small buildings (under $2.5M in qualified rehabilitation expenditures) and increase the 10% non-certified buildings credit to 15%. The bill also proposes returning to pre-TCJA single-year credit claiming (rather than TCJA's 5-year ratable schedule). Similar bills have passed the House in prior Congresses; Senate passage remains elusive due to revenue cost concerns (~$2.5B over 10 years).
• HTC + IRA energy credits stacking: IRA energy efficiency credits (Section 48C advanced manufacturing, Section 179D commercial building deduction, Section 25C home energy credits) can be stacked with HTC for qualifying rehabilitation projects — but the stacking requires careful coordination. IRA's energy credits often require "prevailing wage" and "apprenticeship" labor requirements that, if not met, reduce credit rates to 6% rather than 30%. Historic rehabilitation projects combining HTC with IRA energy credits must meet both NPS historic certification standards and IRA labor requirements.
• NPS certification capacity strain (2025): The National Park Service's State Historic Preservation Office (SHPO) network — which certifies the "certified historic structure" status required for the 20% credit — has faced staffing pressure from DOGE-related federal workforce reductions. NPS review times for Part 2 (description of rehabilitation work) and Part 3 (completed work) certifications had already been criticized as slow (6-18 months); workforce reductions at SHPO-partnered federal offices threaten further delays. Project developers that need certification to close tax credit equity deals face timing risks.
• Office-to-residential conversion and HTC: Post-COVID commercial real estate vacancies have created demand for office-to-residential conversions — many of which involve historic buildings in downtowns. HTC can be used for qualified rehabilitation of certified historic structures converted from office to residential use. The conversion preserves historic building exteriors while creating new housing supply; several major cities (New York, Chicago, Washington D.C.) have offered state-level HTC enhancements to support office conversion. The "substantial rehabilitation test" (QREs must exceed adjusted basis) is challenging for residential conversions where the adjusted basis includes prior commercial improvements.