Low-Income Housing Tax Credit (LIHTC) and Rental Properties

The Low-Income Housing Tax Credit program is the primary federal mechanism for stimulating private investment in affordable rental housing in the United States. Established under the Tax Reform Act of 1986 and codified at 26 U.S.C. § 42, LIHTC allocates tax credits to developers who agree to rent units at below-market rates to income-qualified tenants for a compliance period of at least 30 years. This page covers the program's definition and scope, its credit allocation mechanics, the causal factors that drive project feasibility, classification distinctions between credit types, and the tradeoffs that make LIHTC both powerful and contested in affordable housing policy.

• Definition and scope
• Core mechanics or structure
• Causal relationships or drivers
• Classification boundaries
• Tradeoffs and tensions
• Common misconceptions
• Checklist or steps (non-advisory)
• Reference table or matrix

Definition and scope

The Low-Income Housing Tax Credit is a dollar-for-dollar reduction in federal income tax liability, not a deduction from taxable income. Congress created LIHTC through the Tax Reform Act of 1986 (Public Law 99-514), and it has since become the largest source of financing for new affordable rental construction in the United States, supporting the production or preservation of more than 3.6 million housing units through 2021 according to the National Council of State Housing Agencies (NCSHA).

The Internal Revenue Service administers LIHTC at the federal level, but actual credit authority flows through state housing finance agencies (HFAs). Each state receives a per-capita credit allocation — $2.75 per resident in 2023, with a small-state minimum of $3,185,000 (IRS Revenue Procedure 2022-38) — which HFAs then award competitively to qualified projects. The program applies primarily to multifamily rental properties and certain single-room-occupancy facilities, though it also covers some single-family scattered-site developments.

The scope of LIHTC eligibility encompasses both new construction and substantial rehabilitation of existing rental stock. Projects must commit to income and rent restrictions for a minimum 15-year initial compliance period, followed by an extended-use period that typically runs an additional 15 years (for 30 years total), though HFA qualified allocation plans (QAPs) in many states require 40- to 55-year commitments.

Core mechanics or structure

LIHTC operates through a two-stage credit structure defined by the project's financing sources.

9% Credits (Competitive)
The 9% credit applies to new construction or substantial rehabilitation financed without tax-exempt bonds. The statutory rate is set to yield a present-value benefit equal to approximately 70% of qualified basis. The IRS publishes applicable percentage rates monthly; since 2014, the Consolidated Appropriations Act has fixed the 9% credit at a minimum of 9% of qualified basis (26 U.S.C. § 42(b)(2)).

4% Credits (Non-competitive)
The 4% credit is used alongside tax-exempt private activity bonds and covers existing acquisition costs or bond-financed new construction. The minimum rate was fixed at 4% starting in 2021 under the Consolidated Appropriations Act of 2021 (Public Law 116-260).

Qualified Basis Calculation
Eligible basis is the depreciable cost of the project, reduced by federal grants. Qualified basis equals eligible basis multiplied by the "applicable fraction" — the percentage of units or floor space set aside for income-restricted tenants. A Difficult Development Area (DDA) or Qualified Census Tract (QCT) designation (defined by HUD under 24 C.F.R. § 92) can increase eligible basis by 30%.

Equity Syndication
Developers rarely use credits directly. Syndicators pool credits and sell them to institutional investors — primarily banks seeking Community Reinvestment Act credit — in exchange for equity. Investors receive the annual credit stream over 10 years, which finances a significant share of project construction costs. As of 2022, LIHTC equity prices ranged from approximately $0.90 to $1.10 per dollar of credit, depending on market conditions and project risk profile (NCSHA).

Income and Rent Restrictions
Projects must satisfy one of three minimum set-aside tests under 26 U.S.C. § 42(g):
- 20-50 Test: At least 20% of units reserved for tenants at or below 50% of Area Median Income (AMI)
- 40-60 Test: At least 40% of units reserved for tenants at or below 60% AMI
- Average Income Test (added by the Consolidated Appropriations Act of 2018): At least 40% of units reserved with an average AMI at or below 60%, with no unit exceeding 80% AMI

Gross rents (including utilities) on restricted units cannot exceed 30% of the applicable AMI limit (26 U.S.C. § 42(g)(2)). This connects LIHTC directly to the affordable housing rental programs framework more broadly.

Causal relationships or drivers

Tax Appetite of Investors
LIHTC equity pricing rises and falls with corporate tax rates. The Tax Cuts and Jobs Act of 2017 reduced the corporate tax rate from 35% to 21% (Public Law 115-97), which temporarily compressed investor demand for tax credits because the credits' relative value diminished. Projects that were financially feasible at 35% corporate tax rates required additional subsidy sources after 2017.

Construction Cost Inflation
Because LIHTC provides a fixed credit stream against qualified basis, rising construction costs erode project feasibility by widening the gap between available equity and total development cost. Developers bridge this gap with soft loans from HOME Investment Partnerships funds, Community Development Block Grants, or state housing trust funds.

HFA Allocation Competition
States receive more credit applications than available allocation. HFAs score applications through QAPs that prioritize factors such as proximity to transit, energy efficiency, services for special populations, and local government support. This competitive dynamic means projects with strong location attributes and layered subsidies are more likely to receive awards.

Rent-to-Cost Ratios in High-Cost Markets
In markets where land and construction costs are high, below-market rents generate insufficient operating income to support debt, making LIHTC projects difficult to finance even with full credit allocation. This structural tension makes LIHTC production volume inversely correlated with housing affordability severity in the highest-cost metros.

Classification boundaries

LIHTC projects are distinguished from other market-rate vs. subsidized rentals primarily by their regulatory agreement structure:

LIHTC also differs from the Section 8 Housing Choice Voucher program in a fundamental way: LIHTC restricts the unit itself, while Housing Choice Vouchers subsidize the tenant. A LIHTC unit must serve income-qualified households regardless of which specific tenant occupies it; a voucher follows the tenant to any qualifying landlord.

Tradeoffs and tensions

Depth vs. Breadth of Affordability
LIHTC most efficiently serves households at 50–60% AMI. Households below 30% AMI — the most cost-burdened renters — typically cannot afford even restricted rents without additional subsidy. Advocates including the National Low Income Housing Coalition have documented a shortage of 7.3 million rental homes affordable to extremely low-income renters (NLIHC, The Gap: A Shortage of Affordable Homes, 2023), a population LIHTC alone cannot reach.

Compliance Period Length vs. Investor Return
Longer extended-use periods reduce the likelihood of conversion to market-rate housing but also reduce residual value for investors, compressing equity pricing and project feasibility.

Credit Allocation Method
The per-capita formula distributes credits based on population rather than housing need. States with severe affordability crises and dense populations receive more total credits, but smaller rural states receive minimums that may not reflect their relative need. The formula is set by statute and has not been adjusted on a needs-basis.

Property Tax Exemptions
LIHTC projects in many states receive property tax abatements that reduce local tax revenue. Municipalities sometimes resist LIHTC siting because of this fiscal impact, creating tension between regional housing supply goals and local government budget concerns.

Common misconceptions

Misconception: LIHTC provides direct grants to developers.
Correction: LIHTC is a tax credit, not a grant. Developers receive value by syndicating credits to investors in exchange for equity. The developer receives upfront cash; the investor receives 10 annual installments of tax credit.

Misconception: LIHTC units are public housing.
Correction: LIHTC projects are privately owned and managed, typically by limited partnerships or LLCs. The federal government does not own or operate LIHTC properties. HFAs monitor compliance, not the Department of Housing and Urban Development directly (though HUD may be involved where other subsidies are layered).

Misconception: Any low-income tenant can move into a LIHTC unit.
Correction: Tenants must qualify through an income certification process at move-in. Income limits are based on HUD-published AMI figures for the metropolitan area or non-metropolitan county. Qualification does not guarantee placement; availability depends on vacancies in specific projects.

Misconception: The 9% credit rate is always exactly 9%.
Correction: For projects placed in service before the 9% minimum floor was enacted, the applicable percentage was a floating rate published monthly by the IRS. The 9% floor applies specifically to new construction financed without tax-exempt bonds placed in service after the Consolidated Appropriations Act of 2014.

Misconception: LIHTC and rental property tax deductions are the same type of benefit.
Correction: Standard rental property tax deductions reduce taxable income; LIHTC reduces tax liability dollar-for-dollar. These are structurally different benefits with different investors, different compliance requirements, and different property types.

Checklist or steps (non-advisory)

The following sequence reflects the standard phases of a LIHTC project cycle as described in HFA qualified allocation plans and IRS guidance:

1. Site Control — Developer secures a purchase option or ownership interest in the property to be developed or rehabilitated.
2. QAP Review — State HFA's Qualified Allocation Plan is reviewed to identify scoring criteria, application deadlines, and required set-aside elections (9% competitive or 4%/bond).
3. Financial Feasibility Analysis — Development budget is structured with eligible basis calculation, applicable fraction determination, and DDA/QCT status verified against HUD's annual designations.
4. Tax-Exempt Bond Application (if 4% path) — State volume cap bond allocation is requested from the relevant bond issuer (often the HFA or a local authority).
5. LIHTC Application Submission — Application submitted to HFA with site plans, market study, financial proforma, and evidence of local government support.
6. Reservation Letter Issued — HFA issues a conditional credit reservation if the application scores competitively.
7. Equity Syndication — Syndicator underwrites the credit stream and structures a limited partnership or LLC with institutional investors.
8. Carryover Allocation — If project is not placed in service by December 31 of the allocation year, a carryover allocation is executed under 26 U.S.C. § 42(h)(1)(E) — project must demonstrate at least 10% of expected basis has been incurred.
9. Construction and Lease-Up — Project is built or rehabilitated; units are leased to income-certified tenants.
10. Cost Certification and 8609 Issuance — Certified public accountant prepares a final cost certification; HFA issues IRS Form 8609 (Low-Income Housing Credit Allocation and Certification) to the ownership entity.
11. Annual Owner Compliance Filing — Owner files IRS Form 8609-A each year of the 10-year credit period; HFA conducts physical and file inspections per 26 U.S.C. § 42(m)(1)(B)(iii).
12. Extended-Use Period Monitoring — HFA monitors compliance through the full regulatory agreement term; noncompliance triggers credit recapture and interest under IRS rules.

Reference table or matrix

LIHTC Credit Type Comparison Matrix

AMI Targeting by Set-Aside Test

Key Federal Statutes and Thresholds