The Home Development Mutual Fund (HDMF), commonly known as the Pag-IBIG Fund (acronym of its Filipino name: Pagtutulungan sa Kinabukasan: Ikaw, Bangko, Industriya at Gobyerno[a]), is a government-owned and controlled corporation under the Department of Human Settlements and Urban Development of the Philippines responsible for the administration of the national savings program and affordable shelter financing for Filipinos.

1530[1][2] which was signed by President Ferdinand E. Marcos on June 11, 1978, to answer the national need for savings program and affordable housing financing.

[5] Emily Abinoja, Norma Salud, and Marilou Adea, the vice president of the Shelter Savings Group (SSG), an arm of NHMFC, formed a team to conduct a study of the Central Provident Fund, Singapore's national savings program, with the objective of modeling its fund structure.

The team received support from advertising agency J. Romero & Associates that came up with the acronym Pag-IBIG, from actuaries Enrique Zalamea and Leo Tan, from Kapisanan ng mga Brodkaster ng Pilipinas (KBP) that disseminated information about HDMF across the country, from Technology Resource Center that provided computer facilities, and from Development Bank of the Philippines that offered the initial mortgage lending facilities.

It expanded coverage requiring mandatory membership of all employees regardless of status, which would include self-employed persons, regardless of trade, business or occupation with an income salary of at least ₱1,000.

However, the said individual shall be required to comply with the set of rules and regulations for Pag-IBIG members including the amount of contribution and schedule of payment.

[11] The following shall be allowed to apply for voluntary membership: The most popular program benefit of the Pag-IBIG Fund offers assistance to its members by providing affordable financing for their housing needs.

For members affected by unforeseen calamity like flood, fire, tropical cyclones/typhoons, volcanic eruption and other similar cases.

Unlike the money in a bank regular savings where the interest rate is given, member's earnings in the fund is not readily foreseen ahead of time.