Why these contributions are mandatory, not optional
Every payslip in the Philippines carries a handful of deductions that never feel optional, and three of the biggest are SSS, GSIS, and Pag-IBIG. They aren't fees or taxes in the usual sense, they're forced participation in systems designed to catch you when something goes wrong, sickness, disability, job loss, old age, or a place to live, precisely because most people, left to choose for themselves, wouldn't set that money aside on their own.
Which system covers you depends on who you work for. Private-sector employees, self-employed individuals, and voluntary members fall under the Social Security System, or SSS. Employees of national and local government agencies, from public school teachers to city hall staff, fall under the Government Service Insurance System, or GSIS, instead. Pag-IBIG, the Home Development Mutual Fund, sits apart from that split entirely, it covers nearly everyone with a formal income, government and private-sector employees alike, plus OFWs and voluntary members, because its job isn't income-loss insurance, it's a shared housing and savings fund.
This course goes deep into the mechanics behind those three systems specifically: how much you actually pay, how that amount is calculated, what it builds toward, and how to keep your own contribution record in good enough shape that the benefits are actually there when you need them. Everything from here is peso math and practical steps, not just definitions.
A private-sector employee earning ₱25,000 a month sees roughly ₱1,375 deducted for her SSS share and ₱200 for Pag-IBIG every payday, about ₱1,575 in forced monthly savings and insurance she likely wouldn't set aside voluntarily. A public school teacher earning the same ₱25,000 sees a GSIS deduction instead of an SSS one, since her employment is covered by the government system, but still has the same Pag-IBIG deduction alongside it.
Mini quiz: Which statement correctly describes who is covered by which system?
SSS, GSIS, and Pag-IBIG are mandatory precisely because they force savings and insurance most people wouldn't set aside on their own, with SSS and GSIS split by employer type and Pag-IBIG covering nearly everyone.