Crime: Establishing the Average System Cost per Recorded Offence in South Australia

To estimate the fiscal impact of crime and justice-system demand in South Australia, we apply a system-aligned unit cost methodology focused on total justice-system activity.

The model incorporates the operational expenditure of major justice-system agencies involved in managing the downstream workload associated with criminal offences, including policing, courts, prosecution, judicial administration, and correctional services.

This produces a more realistic and policy-relevant estimate of the average cost imposed on the State each time a new offence enters the justice system.

1. Defining the Relevant Cost Pool

The calculation uses estimated statewide justice-system expenditure for 2024–25, including:

  • police attendance, investigation, and arrest activity
  • court administration and judicial processes
  • prosecution and legal support services
  • custodial services and prison operations
  • community corrections, parole, and offender supervision.

The figures are derived from:

These establish:

  • total justice-system expenditure
  • operational policing costs
  • court-system demand
  • correctional-system capacity pressures
  • overall growth in justice-system workload.

Estimated combined justice-system expenditure:

  • ~$1.87 billion annually

This includes:

  • South Australia Police (SAPOL): ~\$1.14 billion
  • Attorney-General’s Department and Courts: ~\$310 million
  • Department for Correctional Services: ~\$420 million

2. Establishing the Activity Baseline

To estimate an average system cost, we use an activity baseline of approximately:

  • 200,000 recorded offences annually

This figure reflects the broad operational workload imposed on the justice system across metropolitan and regional South Australia.

It captures the cumulative demand that drives policing, court processing, correctional supervision, and custodial expenditure.

3. Calculating the Average Cost per Recorded Offence

The system-average cost per offence is calculated by dividing total justice-system expenditure by the total annual offence volume.

Calculation:

$1,870,000,000 ÷ 200,000 = $9,350 per recorded offence

This produces an estimated average system cost of:

  • ~$9,350 per recorded offence

This represents a system-average activity cost, not the literal cost of every individual offence.

Actual costs vary substantially depending on offence severity, investigative complexity, court duration, incarceration requirements, and repeat offending.

4. Estimated Fiscal Impact of Reducing Crime Demand

Using the estimated average cost of approximately $9,350 per offence, the potential reduction in justice-system expenditure pressure associated with lower crime rates can be estimated as follows:

Reduction in Recorded Offences Offences Avoided Approximate Annual Expenditure Pressure Avoided
5% ~10,000 ~$93.5 million
10% ~20,000 ~$187 million
20% ~40,000 ~$374 million

These figures represent estimated reductions in justice-system expenditure pressure and operational demand rather than immediate cash-releasable savings, because policing, courts, and correctional systems contain substantial fixed infrastructure and workforce costs.

5. Key Policy Insight

A significant proportion of justice-system expenditure is generated not by isolated incidents alone, but by repeated cycles of escalation, enforcement, court processing, incarceration, and recidivism.

Sustained reductions in crime demand therefore have the potential to:

  • reduce pressure on front-line policing
  • reduce court backlogs and judicial workload
  • reduce prison overcrowding and correctional expenditure
  • improve workforce sustainability across justice agencies
  • reduce long-term systemic demand pressures.

Even modest reductions in crime incidence therefore have the potential to generate significant statewide economic and operational benefits.

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