Mortgage Repayment Burden Index (MRBI) — methodology

What this metric measures

Modelled percentage of average gross income required to service a typical new mortgage. Assumes 80% LVR on a median-priced dwelling at the prevailing standard variable rate over a 30-year term.

Why it matters: Shows how much of a typical income goes to mortgage repayments for a new buyer. Higher values indicate reduced housing affordability.

Source & provenance

Publisher

ABS

Update frequency

monthly

Licence

CC BY 4.0

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How the score is computed

The score is a 0–100 normalisation of the latest observation, compared to a baseline window. The traffic-light rating (RAG) reflects both the absolute level and the recent trend.

Direction

Lower is better

Trend window

60 months

Baseline

Last 10 years

{
  "mode": "absolute",
  "red_min": 35,
  "amber_max": 35,
  "green_max": 25
}