LIHTC + IRA Credits: Stacking Guide for Affordable Housing
Affordable housing developers have access to one of the most powerful incentive stacks in the US tax code. By combining Low-Income Housing Tax Credits (LIHTC) with IRA credits, particularly the ITC for on-site solar and the energy community bonus adder, developers can reduce project gap funding requirements significantly and improve project feasibility in markets where affordable housing is desperately needed.
Updated September 10, 2026: Earlier versions of this guide listed the Section 45L new energy efficient home credit as a LIHTC stacking layer. The One Big Beautiful Bill Act (P.L. 119-21) ended 45L for homes acquired after June 30, 2026, so it no longer appears in the stack below. For New York projects, the state, NYC and utility programs in the IncentEdge catalog are not affected by that law.
LIHTC Basics: 9% vs. 4% Credits
The Low-Income Housing Tax Credit (LIHTC) is the primary federal affordable housing production subsidy. Created by the Tax Reform Act of 1986, LIHTC provides tax credits to investors in affordable housing developments, with the credits allocated to developers through state Housing Finance Agencies (HFAs).
9% LIHTC (Competitive)
- Annually competitive allocation from state HFA
- Produces ~70% of affordable project cost in credit equity
- Typical credit: $8,000–$20,000 per unit
- Requires competitive application — scored against other projects
- Best for projects that cannot access tax-exempt bonds
4% LIHTC (Non-Competitive)
- Paired with tax-exempt private activity bond financing that meets the bond-financed test in IRC §42(h)(4); confirm the current threshold with tax counsel
- Produces ~30–40% of project cost in credit equity
- Typical credit: $3,000–$8,000 per unit
- Non-competitive — available as-of-right with qualifying bonds
- Best for larger projects in high-cost bond markets
LIHTC investors purchase credits at roughly 90–95 cents per dollar of credit value, providing cash equity to the project. A 200-unit 9% LIHTC project at $15,000/unit in credits generates $3 million per year for 10 years — or $30 million in total LIHTC equity at face value, typically syndicated for ~$27–28.5 million in actual equity.
Which IRA Credits Stack with LIHTC?
There is no statutory prohibition against combining LIHTC with IRA credits. The key consideration is the eligible basis calculation — IRA credits that reduce eligible basis (like grants or rebates) require adjustments, but tax credits in different code sections generally stack cleanly.
Investment Tax Credit (ITC) — On-Site Solar
30%–50%+ of solar costOn-site solar for a LIHTC multifamily building qualifies for the ITC. The ITC and LIHTC are in entirely different code sections (Section 48E vs. Section 42) and do not interact with each other's basis calculations. The ITC low-income bonus (+10 points for a low-income community location, +20 points for a qualifying low-income residential building project) can apply on top, but it requires a capacity allocation through an annual application. Under the One Big Beautiful Bill Act, the solar ITC and its bonuses are available only if construction began by July 4, 2026, or the system is placed in service by December 31, 2027.
Important: For LIHTC deals where the solar system is part of the same partnership structure, tax counsel should confirm that the ITC partnership allocations do not conflict with LIHTC investor requirements.
Energy Community ITC Bonus (+10%)
+10% on ITC rateMany LIHTC-eligible census tracts overlap with energy community designations. The IRS energy community map and HUD's low-income census tract data share significant geographic overlap in legacy industrial communities. Projects in both LIHTC-eligible areas and energy communities get the ITC bonus automatically.
PACE Financing
Non-credit, capital toolPACE financing for energy improvements (solar, efficiency, geothermal) can be incorporated into LIHTC capital stacks with the consent of the senior lender and the approval of the state HFA. HFA policies on PACE differ, so confirm with the HFA in your state before structuring it into a deal.
Full Stack Example: 120-Unit Affordable Multifamily
120-Unit 4% LIHTC + Bonds, Energy Community Census Tract
Illustrative example. Numbers vary by state, project, and market conditions. The solar ITC line assumes the array began construction by July 4, 2026 or is placed in service by December 31, 2027.
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