Income
Individual income quartiles
About this topic
Individual income quartiles group people aged 15 years and over into four evenly sized income ranges so the distribution of personal income can be compared objectively across areas and over time. The quartile method focuses on relative position in the income distribution rather than raw dollar brackets.
This topic is useful because direct income amounts are affected by inflation and wider economic change. Quartiles provide a clearer way to compare whether an area is becoming relatively lower, middle, or higher income over time.
Interpretation notes
- This is a derived distribution of personal income for people aged 15 years and over, with each quartile representing a quarter of the income distribution.
- Quartiles show relative position rather than fixed dollar brackets, which makes them more robust for comparisons over time.
Key insight
In 2021, the medium-low income quartile held the largest share among residents aged 15 and over in Kogan, accounting for 37.9%.
Section overview
Individual income quartiles
Kogan - Persons aged 15+ (Usual residence)
This table summarises individual income quartiles for Kogan in 2021 for persons, with comparison against Western Downs (R) and change since 2016.
Individual income quartiles snapshot
2021 distribution by category for Kogan, with comparison markers for Western Downs (R).
Lowest group
2021 count
44
% of total
28.8%
Change from 2016
+7.4pp
44
28.8%
+7.4pp
Medium lowest
2021 count
58
% of total
37.9%
Change from 2016
-4.6pp
58
37.9%
-4.6pp
Medium highest
2021 count
31
% of total
20.3%
Change from 2016
-1.7pp
31
20.3%
-1.7pp
Highest group
2021 count
20
% of total
13.1%
Change from 2016
-0.9pp
20
13.1%
-0.9pp
Chart view
Individual income quartiles change
Absolute change in category counts between 2016 and 2021.
Lowest group
-55
+7.4pp
Medium lowest
-139
-4.6pp
Medium highest
-71
-1.7pp
Highest group
-45
-0.9pp
Data table
Individual income quartiles for Kogan. Individual income quartiles. 2021 and 2016 counts, percentages, and change compared with Western Downs (R).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Western Downs (R)% | Count | % | Western Downs (R)% | Count | pp | |
| Lowest group | 44 | 28.8% | 24.4% | 99 | 21.4% | 22.7% | -55 | +7.4pp |
| Medium lowest | 58 | 37.9% | 30.3% | 197 | 42.5% | 28.7% | -139 | -4.6pp |
| Medium highest | 31 | 20.3% | 25.4% | 102 | 22.0% | 26.0% | -71 | -1.7pp |
| Highest group | 20 | 13.1% | 19.9% | 65 | 14.0% | 22.6% | -45 | -0.9pp |
| Total persons aged 15+ | 153 | 100.0% | 100.0% | 463 | 100.0% | 100.0% | -310 | 0.0pp |