Within the Housing and Urban Development Act of 1965, Congress authorized the Rent Supplement Program, which provided rental subsidies to low-income tenants living in privately-owned housing. The program was created to provide affordability to low-income households in federal Section 221(d)(3) projects. Under the program, eligible tenants paid 25 percent of their income toward the rent. The difference between the tenant payment and the market rent was made up by a Rent Supplement payment provided directly to the project owner. The program was ultimately replaced by the Section 8 New Construction and Substantial Rehabilitation (Section 8 NC/SR) program; however, a number of units under the original program still receive Rent Supplement payments under existing contracts. Tenants in buildings currently receiving Rent Supplement payments pay 30 percent of their household income towards rent.