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 lowest household income quartile held the largest share among households with income in Kwinana (C), accounting for 25%.

Section overview

Household income quartiles

Kwinana (C) - Households (Enumerated)

This table summarises household income quartiles for Kwinana (C) in 2021 for persons, with comparison against Greater Perth.

Chart view

Household income quartiles snapshot

2021 distribution by category for Kwinana (C), with comparison markers for Greater Perth.

Kwinana (C)
Greater Perth

Lowest group

2021 count

3,522

% of total

25.0%

Medium lowest

2021 count

3,522

% of total

25.0%

Medium highest

2021 count

3,522

% of total

25.0%

Highest group

2021 count

3,522

% of total

25.0%

Data table

Household income quartiles for Kwinana (C). Household income quartiles. 2021 counts and percentages compared with Greater Perth.

Household income quartiles for Kwinana (C). Household income quartiles. 2021 counts and percentages compared with Greater Perth.
Household income quartiles for Kwinana (C). Household income quartiles. 2021 counts and percentages compared with Greater Perth.
Category2021 count2021 %Greater Perth %
Lowest group3,52225.0%25.0%
Medium lowest3,52225.0%25.0%
Medium highest3,52225.0%25.0%
Highest group3,52225.0%25.0%
Total Households14,088100.0%100.0%