The Low-Income Housing Tax Credit (LIHTC - often pronounced "lie-tech", Housing Credit) is a dollar-for-dollar tax credit in the United States for affordable housing investments. It was created under the Tax Reform Act of 1986 (TRA86) and gives incentives for the utilization of private equity in the development of affordable housing aimed at low-income Americans, with affordability restrictions on the properties expiring 15-30 years later. LIHTC accounts for the majority (approximately 90%) of all newly created affordable rental housing in the United States today. The maximum rent that can be charged for designated affordable units is based on Area Median Income (AMI), and over 50% of residents in LIHTC properties are considered Extremely Low-Income (at or below 30% AMI). The credits are also commonly called Section 42 credits in reference to the applicable section of the Internal Revenue Code. The tax credits are more attractive than tax deductions as the credits provide a dollar-for-dollar reduction in a taxpayer's federal income tax, whereas a tax deduction only provides a reduction in taxable income. The "passive loss rules" and similar tax changes made by TRA86 greatly reduced the value of tax credits and deductions to individual taxpayers. Less than 10% of current credit expenditures are claimed by individual investors.

In 2010, the President's Economic Recovery Advisory Board (PERAB) estimated that the LIHTC program would cost the federal government $61 billion (an average of about $6 billion per year) in lost tax revenue from participating corporations from 2008-2017, as well as noting that some experts believe that vouchers would more cost-effectively help low income households.

A 2018 report by the GAO covering the years 2011-2015 found that the LIHTC program financed about 50,000 low-income rental units annually, with median costs per unit for new construction ranging from $126,000 in Texas to $326,000 in California. ^{: 1 : 1} LIHTC projects increase land value in surrounding neighborhoods.