OSCA codes: changes to our contribution file data specifications

An important part of serving around 250,000 GESB members involves supporting employers in providing the information we need to help you meet your super obligations. Here are key details to know about recent changes to our contribution file data specifications, in line with a new jobs classification system.

New workforce reporting requirements

From 1 July 2026, WA Government agencies are required to use updated Human Resource Minimum Obligatory Information Requirements (HR MOIR) data definitions for all quarterly workforce reporting.

These updated data definitions include the new Occupation Standard Classification for Australia (OSCA). This is a new jobs classification system, which has been designed to replace ANZSCO to better reflect Australia’s modern workforce.

How we’re supporting employers with this change

To align with HR MOIR data definitions, we’re updating Employer Online so we can accept OSCA values in contribution files from 1 July 2026.

We’ve also published our updated SuperStream Alternative File Format (SAFF) data specification document to help your agency prepare for this change.

The correct format for contribution data

When using OSCA codes in contribution files for GESB accounts, you’ll need to submit these in the correct format:

• For GESB Super and West State Super contributions, you’ll need to provide an ‘O’ value in front of the OSCA code in the Occupation description field of the Superfund member registration section of the SuperStream Alternative File Format (SAFF) file. This value allows us to identify the job classification system you are using.
• For Gold State Super contributions, we’ll publish updated Electronic data exchange specifications on the brochures and forms page of this website by 1 July

If you are not using OSCA codes in your payroll process, you can continue to provide ANZSCO codes (prefixed with the letter ‘Z’) and ASCO codes (prefixed with the letter ‘A’) in your contribution files.

Why this information is important

The job classification you provide in your contribution file is used to determine the occupation category for members that are eligible for insurance. This helps to ensure these members will be set up with the correct insurance cover and charged the correct premium.

As your employees may be aware, insurance cover in their super can provide financial support if they become sick or injured. This can be an important source of support, in addition to their super or other entitlements, if they are eligible to make a claim.