Want to know where Australia's biggest income earners live? 
The latest taxation statistics for 2017-18 which are based on the tax returns of 14.3 million Australians tell us where they are.
Seven of the nation's average highest-earning postcodes are in NSW, while six of the lowest-earning postcodes are in Queensland.
Sydney's eastern suburbs dominated the list of Australia's areas with the highest taxable incomes, topped by Double Bay residents with $242,428.
Ten highest earning postcodes 2017-18
| Postcode | Suburb | Average Taxable Income |
|---|---|---|
| NSW 2028 | DOUBLE BAY | $242,428 |
| NSW 2027 | DARLING POINT, EDGECLIFF, HMAS RUSHCUTTERS, POINT PIPER | $198,828 |
| VIC 3142 | HAWKSBURN, TOORAK | $196,816 |
| NSW 2023 | BELLEVUE HILL | $193,440 |
| VIC 3002 | EAST MELBOURNE | $185,437 |
| NSW 2030 | DOVER HEIGHTS, HMAS WATSON, ROSE BAY NORTH, VAUCLUSE,
WATSONS BAY |
$181,954 |
| NSW 2110 | HUNTERS HILL, WOOLWICH | $177,615 |
| NSW 2088 | MOSMAN, SPIT JUNCTION | $171,904 |
| NSW 2063 | NORTHBRIDGE | $169,142 |
| WA 6011 | COTTESLOE, PEPPERMINT GROVE | $167,090 |
Top income earning postcodes in NSW
Source: ATO and Sydney Morning Herald
Top income earning postcodes in Victoria
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Source: ATO and Sydney Morning Herald
Ten lowest-earning postcodes
The nation's poorest income earners mostly reside in small towns in Queensland.
Postcode 4732, which takes in Muttaburra and Tablederry in central-west Queensland, has the lowest average taxable income in the country at $14,681.
And third-lowest was NSW's 2308 — the Newcastle University, Callaghan area — with an average income of $21,054.
| Postcode | Suburb | Average Taxable Income |
|---|---|---|
| QLD 4732 | TABLEDERRY, MUTTABURRA | $14,681 |
| QLD 4426 | JACKSON, JACKSON NORTH, JACKSON SOUTH | $19,396 |
| NSW 2308 | NEWCASTLE UNIVERSITY, CALLAGHAN | $21,054 |
| QLD 4611 | MONDURE, MARSHLANDS | $22,524 |
| QLD 4467 | MUNGALLALA, TYRCONNEL, REDFORD | $22,795 |
| SA 5308 | GALGA, MANTUNG, COPEVILLE, PERPONDA, MERCUNDA | $24,714 |
| NSW 2387 | BULYEROI, ROWENA | $25,623 |
| VIC 3889 | ERRINUNDRA, MANORINA, CLUB TERRACE, COMBIENBAR,
BEMM RIVER, CABBAGE TREE CREEK, BELLBIRD CREEK |
$27,079 |
| QLD 4612 | KAWL KAWL, HIVESVILLE, KEYSLAND, STONELANDS, WIGTON | $27,617 |
| QLD 4423 | TEELBA, GLENMORGAN | $27,722 |
