|Value||100 Australian dollars|
|Security features||Clear window with embossing, micro printing, slightly raised printing, hold the note towards light and the Australian coat of arms plus a seven pointed star will appear, ultraviolet, Unic serial number and different fonts, watermark|
|Years of printing||1996, 1998-99, 2008, 2010-11, 2013-14, 2017|
|Design||Dame Nellie Melba|
|Design||Sir John Monash|
The Australian one hundred-dollar note was first issued in 1984 as a paper note. There have been two different issues of this denomination: initially a very light turquoise-blue paper note, and from May 1996, a green polymer note.
According to Reserve Bank of Australia statistics, the number of $100 banknotes in circulation in June 2005 was 149 million--18.5% of all notes in circulation. The cash value for these notes was $14,924 million--41.9% of the total value for all denominations. Only the $50 note had more cash value in circulation. In June 2008 there were 176.9 million notes in circulation (19%), with a value of $17,690 million (42.1%). Again, the value of cash in circulation is more for the $50 note. The larger value in $50 notes can be explained by the fact that almost all automated teller machines dispense $20 and $50 notes, but not $100 notes.
In December 2016 it was reported that Australia may abolish its $100 note to close down loopholes used by the black economy. However, the Reserve Bank of Australia officially stated that there are no plans to abolish the $100 note.
The paper issue has a portrait of Antarctic explorer Sir Douglas Mawson, with a background of a mountain range with a geological strata format. A large diamond shape appears to the left of the main picture. Astronomer John Tebbutt is on the reverse, with a background of the observatory he built and a local church.
The paper design includes a watermark of Captain James Cook in the white field, and a metallic strip embedded in the paper to the left (on the obverse side) of the note. The same watermark was used in the last issue of the pre-decimal banknotes.
The polymer issue includes a shadow image of the Australian Coat of Arms, which is printed over. In the clear window, there is embossing--or a raised image--of the number 100 and a print of a lyrebird. Also for this issue, fluorescent colouring was added to the serial numbers, as well as a patch that shows the banknote's value under ultraviolet light. The star's four points on the obverse and three on the reverse join to form the seven-pointed Federation Star when the note is held up to the light. Raised print and micro-printing of the denomination value are also included.