SSO is a non-governmental organisation and it is solely financed by contributions (with participation of insured (7%), employer (20–23%) and government (3%)).[1][7][8] Social protection is extended to the self-employed workers, who voluntarily contribute between 12% and 18% of income depending on the protection sought. Civil servants, the regular military, law enforcement agencies, and the Islamic Revolutionary Guard Corps, Iran’s second major military organisation, have their own pension systems.