Understanding the Australian Dollar: A Complete Guide to Australia's Currency
The Australian dollar (AUD) is more than just a medium of exchange; it is a symbol of the nation's economic history and a major player in the global financial landscape. As the seventh most traded currency in the world, the Australian dollar plays a vital role in international trade and foreign exchange markets.
Whether you are a traveler planning a trip to the Land Down Under or a student of economics, understanding how this currency works—from its historical roots to its modern polymer banknotes—is essential. This guide explores the technical details, history, and practical usage of the Australian dollar.
Key Facts
- ISO 4217 Code: AUD
- Subunit: 1/100 of a dollar (the cent)
- Central Bank: Reserve Bank of Australia (RBA)
- Introduction Date: 14 February 1966
- Preceding Currency: The Australian pound (£A)
- Global Standing: 7th most traded currency globally (6.1% daily share as of 2025)
The History and Evolution of Australian Money
From the Australian Pound to the Dollar
Before the decimal system was introduced, Australia used the Australian pound (£A), which was established in 1910. Initially, it was at par (equal value) with the British pound sterling. The pound was a complex system divided into 240 pence. However, following a 25% devaluation in December 1931, the relationship between the two currencies shifted.
The transition to the modern Australian dollar occurred on 14 February 1966, replacing the pound and simplifying the system into a decimal format. This change marked a significant milestone in Australia's economic sovereignty.
The Adoption of the Dollar Beyond Australia
The Australian dollar is not only used within Australia but also serves as the official currency for several nations and territories. It is used in Kiribati, Nauru, and Tuvalu (where it is pegged at par with the Tuvaluan and Kiribati dollars). Additionally, it remains legal tender in Australia's external territories, including Christmas Island, Cocos (Keeling) Islands, and Norfolk Island.
Modern Currency: Banknotes and Coins
The Shift to Polymer Banknotes
Australia is a pioneer in banknote technology. While the first paper issues were released in 1966, the country transitioned to polymer banknotes—notes made from a specialized plastic film—starting in 1992. These notes are highly durable and feature advanced security elements like clear windows.
The current second polymer series features prominent Australian figures and landmarks. For example, the $50 note honors Aboriginal writer and inventor David Unaipon and Australia's first female parliamentarian, Edith Cowan.
The Coinage System
Australia's coins range from small denominations like the 5c to the $2 coin. While 1c and 2c coins were withdrawn from circulation in 1992, they technically remain legal tender for very small amounts. Modern coins often feature unique Australian fauna, such as the echidna on the 5c coin or the platypus on the 20c coin.
Currency Denominations Summary
| Type | Common Denominations | Rare/Discontinued |
|---|---|---|
| Banknotes | $5, $10, $20, $50, $100 | $1, $2 (no longer in production) |
| Coins | 5c, 10c, 20c, 50c, $1, $2 | 1c, 2c (no longer in production) |
Legal Tender and Economic Value
Understanding Legal Tender Laws
In Australia, the rules for legal tender (money that must be accepted for the settlement of a debt) differ between notes and coins. Under the Reserve Bank Act 1959, Australian banknotes are legal tender throughout the country without any limit on the amount.
However, the Currency Act 1965 imposes specific limits on coins. For instance, $1 coins are legal tender for payments up to $10, while $2 coins are limited to payments up to $20. Using large amounts of small change to pay for significant debts may be restricted by these regulations.
Global Market Position
The value of the Australian dollar is determined by various economic factors. As of 2025, it remains a heavyweight in the foreign exchange market, holding a 6.1% share of daily global trading volume. It sits behind major currencies such as the U.S. dollar, the euro, the Japanese yen, the pound sterling, the Renminbi, and the Swiss franc.
Frequently Asked Questions
What is the ISO code for the Australian dollar?
The ISO 4217 code for the Australian dollar is AUD. Its numeric code is 036.
Are old Australian banknotes still valid?
Yes. Although the $1 and $2 banknotes are no longer printed, all previous issues of Australian banknotes remain lawful legal tender in Australia.
Which central bank issues Australian money?
The Reserve Bank of Australia (RBA) is responsible for the issuance of banknotes, while the Royal Australian Mint is responsible for the production of coins.
Is the Australian dollar used in other countries?
Yes, the Australian dollar is the official currency in Kiribati, Nauru, and Tuvalu. It is also legal tender in Christmas Island, Cocos (Keeling) Islands, and Norfolk Island.
What is the difference between a subunit and a unit in AUD?
The unit is the dollar, and the subunit is the cent. There are 100 cents in one Australian dollar.