Monetary union
Australia’s monetary institutions developed into a common federal system after the Restoration. New Zealand’s state union required a coordinated conversion and banking settlement. Decimalisation adopted the Southern Dollar name in 1966, with 100 cents to each dollar. Territorial admissions brought their banking and payments systems into the common framework through local transition arrangements.
Notation
The currency symbol is S$, with the national registry code CSD. S$ can refer to other currencies outside the Commonwealth, so international records use CSD or the written name Southern Dollar. This registry notation does not establish a fixed exchange rate with the US dollar or any allied currency.
Reserve bank and banking
The Southern Reserve Bank manages monetary stability, national payments and reserve operations. Regulated private banks serve households and firms; public development banks finance approved long-term infrastructure and industrial programmes. Cabinet sets fiscal policy through parliamentary budgets, while reserve-bank operations and public lending are recorded separately.
National output
The 2026 GDP figure of US$10.4 trillion is expressed in US dollars for international comparison. It is not the same quantity as the Southern Dollar money supply. A population of 104 million at US$100,000 nominal output per person gives that total arithmetically. A conversion into CSD requires an exchange-rate assumption not yet assigned.