The pataca (or patacão in Portuguese) is the official currency of Macau. It is subdivided into 100 avos, with 10 avos called ho in Cantonese. The abbreviation MOP$ is commonly used. The pataca was introduced in Portuguese Macau and Portuguese Timor in 1894, replacing the real at a rate of 1 pataca = 5$00 reais. In 1945, the Japanese occupation authorities issued notes for 10, 20 and 50 avos, 1 and 5 patacas. In 1949, the authorities issued notes for 1, 5, 10, 20, 50 and 100 patacas. These notes were not accepted by the government of China, which had declared that the pataca was worth only 1⁄3 of its value before the occupation.
In 1952, new notes were issued for 1, 5, 10, 20, 50 and 100 patacas, with the 20 patacas note replaced by a 20 avos note in 1953. The 5 patacas note was replaced by a coin in 1962. In 1963, a new series of notes was introduced for 1, 5, 10, 20, 50 and 100 patacas. These notes were issued until 1999, when a new series of notes was introduced. The 1, 5 and 10 patacas notes were replaced by coins in 2000, 2002 and 2006, respectively. The 20 patacas note was replaced by a 20 avos coin in 2008.
In 2012, the government of Macau issued a new series of notes, which are very similar to the previous one. The only differences are the inclusion of the BNU logo on the obverse and the omission of the Portuguese text on the reverse. The 1, 5, 10 and 20 patacas notes were replaced by coins in 2013, 2015, 2017 and 2019, respectively.