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 Upper Ferntree Gully (part), accounting for 27.3%.
Section overview
Individual income quartiles
Upper Ferntree Gully (part) - Persons aged 15+ (Usual residence)
This table summarises individual income quartiles for Upper Ferntree Gully (part) in 2021 for persons, with comparison against Knox (C) and change since 2016.
Individual income quartiles snapshot
2021 distribution by category for Upper Ferntree Gully (part), with comparison markers for Knox (C).
Lowest group
2021 count
596
% of total
22.2%
Change from 2016
-2.0pp
596
22.2%
-2.0pp
Medium lowest
2021 count
698
% of total
26.0%
Change from 2016
+2.2pp
698
26.0%
+2.2pp
Medium highest
2021 count
657
% of total
24.5%
Change from 2016
+1.0pp
657
24.5%
+1.0pp
Highest group
2021 count
732
% of total
27.3%
Change from 2016
-1.2pp
732
27.3%
-1.2pp
Chart view
Individual income quartiles change
Absolute change in category counts between 2016 and 2021.
Lowest group
-1,302
-2.0pp
Medium lowest
-1,173
+2.2pp
Medium highest
-1,190
+1.0pp
Highest group
-1,507
-1.2pp
Data table
Individual income quartiles for Upper Ferntree Gully (part). Individual income quartiles. 2021 and 2016 counts, percentages, and change compared with Knox (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Knox (C)% | Count | % | Knox (C)% | Count | pp | |
| Lowest group | 596 | 22.2% | 25.7% | 1,898 | 24.2% | 24.9% | -1,302 | -2.0pp |
| Medium lowest | 698 | 26.0% | 24.5% | 1,871 | 23.8% | 24.0% | -1,173 | +2.2pp |
| Medium highest | 657 | 24.5% | 25.8% | 1,847 | 23.5% | 26.5% | -1,190 | +1.0pp |
| Highest group | 732 | 27.3% | 24.0% | 2,239 | 28.5% | 24.6% | -1,507 | -1.2pp |
| Total persons aged 15+ | 2,683 | 100.0% | 100.0% | 7,855 | 100.0% | 100.0% | -5,172 | 0.0pp |