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 highest household income quartile held the largest share among households with income in Mount Martin, accounting for 39.3%.

Section overview

Household income quartiles

Mount Martin - Households (Enumerated)

This table summarises household income quartiles for Mount Martin in 2021 for persons, with comparison against Mackay (R) and change since 2016.

Household income quartiles snapshot

2021 distribution by category for Mount Martin, with comparison markers for Mackay (R).

Mount Martin
Mackay (R)

Lowest group

2021 count

14

% of total

23.0%

Change from 2016

-

Medium lowest

2021 count

10

% of total

16.4%

Change from 2016

-

Medium highest

2021 count

13

% of total

21.3%

Change from 2016

-

Highest group

2021 count

24

% of total

39.3%

Change from 2016

-

Data table

Household income quartiles for Mount Martin. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Mackay (R).

Household income quartiles for Mount Martin. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Mackay (R).
Household income quartiles for Mount Martin. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Mackay (R).
Category20212016Change
Count%Mackay (R)%Count%Mackay (R)%Countpp
Lowest group1423.0%23.9%613.6%25.2%--
Medium lowest1016.4%21.6%1329.5%23.1%--
Medium highest1321.3%25.8%1227.3%25.3%--
Highest group2439.3%28.6%1329.5%26.5%--
Total Households61100.0%100.0%44100.0%100.0%--