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SAL
: Knox (C)
: Persons

Income

Household income quartiles

About this topic

Household income quartiles group households into four evenly sized income ranges so relative income position can be compared across places and across Census years. They provide a distribution view of household income rather than a simple count in fixed dollar brackets.

This topic is useful because raw household income amounts are influenced by inflation and broader economic shifts. Quartiles make it easier to see whether an area's households are concentrated toward lower, middle, or higher income positions over time.

Interpretation notes

  • This is a derived distribution of total household income, so each quartile shows relative position rather than a fixed income bracket.
  • It is useful for over-time comparison because quartile groupings are less distorted by inflation than raw dollar bands.

Key insight

In 2021, the medium-low household income quartile held the largest share among households with income in Knoxfield, accounting for 26.6%.

Section overview

Household income quartiles

Knoxfield - Households (Enumerated)

This table summarises household income quartiles for Knoxfield in 2021 for persons, with comparison against Knox (C) and change since 2016.

Boundary-adjusted comparison

This area boundary has changed from 2016 to 2021. As a result, 2016 values are mapped onto 2021 suburb boundaries using ABS concordance.

Household income quartiles snapshot

2021 distribution by category for Knoxfield, with comparison markers for Knox (C).

Knoxfield
Knox (C)

Lowest group

Medium lowest

Medium highest

Highest group

Data table

Household income quartiles for Knoxfield. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Knox (C).

Household income quartiles for Knoxfield. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Knox (C).
Household income quartiles for Knoxfield. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Knox (C).
Category20212016Change
Count%Knox (C)%Count%Knox (C)%Countpp
Lowest group63223.5%22.5%48820.5%20.6%--
Medium lowest71326.6%24.4%65827.6%24.9%--
Medium highest70226.1%26.9%66728.0%27.4%--
Highest group63823.8%26.2%56823.9%27.1%--
Total Households2,685100.0%100.0%2,381100.0%100.0%--