What happens to social security funds once they are paid into the system?

Once Social Security funds are paid into the system through payroll taxes, they are used to provide benefits to current retirees, disabled individuals, and survivors of deceased workers. Any surplus funds are invested in special U.S. Treasury bonds, which earn interest and are intended to help finance future benefits. However, as the population ages and the ratio of workers to beneficiaries declines, funds may become insufficient to cover all promised benefits, leading to potential shortfalls in the program.