It is unclear whether this question is referring to the income from other nations which Australia derives from exporting its goods and services, or of the highest individual Australian wage earner. The following answer presumes the former: According to the Australia Dept of Foreign Affairs and Trade (refer to the link, below), Australia's primary export in 2008 (i.e., that year being the latest, complete information as of July 2009) was coal, and its primary export destination/recipient is Japan, though not necessarily for coal. Reference: www.dfat.gov.au
