The ACMA said the SMS and emails suggest that users are owed a refund. The email will lure users to click on a malicious link or visit a fake website in order to receive a tax refund.
Other emails may ask users to update personal details through a link or attachment.
These messages will also often reference other government agencies or services such as the Australian Taxation Office (ATO) or programs like Medicare.
They may also use government logos to make the message look legitimate.
The ACMA strongly advises to not click on any links or open any attachments as these are phishing scams that can steal personal or financial details.
According to ACMA, myGov will never send users an email or SMS with a link. If in doubt, users are instructed to type my.gov.au into their browser and sign into their myGov account or contact Services Australia direcly.
Users can find more information on how to identify scams via the myGov website.
Services Australia also provides advice to consumers on these and other similar scams on its website.