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 highest income quartile held the largest share among residents aged 15 and over in Mount Barker Springs, accounting for 43.7%.
Section overview
Individual income quartiles
Mount Barker Springs - Persons aged 15+ (Usual residence)
This table summarises individual income quartiles for Mount Barker Springs in 2021 for persons, with comparison against Mount Barker (DC) and change since 2016.
Individual income quartiles snapshot
2021 distribution by category for Mount Barker Springs, with comparison markers for Mount Barker (DC).
Lowest group
2021 count
30
% of total
22.2%
Change from 2016
-2.6pp
30
22.2%
-2.6pp
Medium lowest
2021 count
25
% of total
18.5%
Change from 2016
+2.8pp
25
18.5%
+2.8pp
Medium highest
2021 count
21
% of total
15.6%
Change from 2016
-0.9pp
21
15.6%
-0.9pp
Highest group
2021 count
59
% of total
43.7%
Change from 2016
+0.7pp
59
43.7%
+0.7pp
Chart view
Individual income quartiles change
Absolute change in category counts between 2016 and 2021.
Lowest group
0
-2.6pp
Medium lowest
+6
+2.8pp
Medium highest
+1
-0.9pp
Highest group
+7
+0.7pp
Data table
Individual income quartiles for Mount Barker Springs. Individual income quartiles. 2021 and 2016 counts, percentages, and change compared with Mount Barker (DC).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Mount Barker (DC)% | Count | % | Mount Barker (DC)% | Count | pp | |
| Lowest group | 30 | 22.2% | 22.2% | 30 | 24.8% | 21.9% | 0 | -2.6pp |
| Medium lowest | 25 | 18.5% | 26.6% | 19 | 15.7% | 26.2% | +6 | +2.8pp |
| Medium highest | 21 | 15.6% | 27.6% | 20 | 16.5% | 27.1% | +1 | -0.9pp |
| Highest group | 59 | 43.7% | 23.6% | 52 | 43.0% | 24.8% | +7 | +0.7pp |
| Total persons aged 15+ | 135 | 100.0% | 100.0% | 121 | 100.0% | 100.0% | +14 | 0.0pp |