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Antivirus is one of those purchases Australians either ignore until something goes wrong or overthink to the point of installing three overlapping programs that grind the machine to a halt. The truth sits in between. Modern Windows and macOS already include solid baseline protection, and a single well-chosen antivirus, used sensibly, is plenty for most households.
This matters more than it used to. The ACSC's annual Cyber Threat Report and the ACCC's Scamwatch both record hundreds of millions of dollars lost to online scams in Australia each year, much of it starting with malware, phishing or a fake "tech support" pop-up. Good security software helps, but so does knowing that real antivirus is never sold through an alarming browser pop-up or an unsolicited phone call claiming to be from "Microsoft" or "Telstra".
This guide cuts through the marketing, explains when the built-in tools are enough, and lists trusted vendors. We only link to official vendor sites, because fake antivirus is itself a common form of malware. Paid suites are typically billed in AUD with GST included on Australian checkout pages.
Top picks & alternatives
Bitdefender
Highly rated antivirus with free and AUD-priced premium editions.
Visit official site ↗
Do you even need third-party antivirus?
If you run Windows 10 or 11, Microsoft Defender is built in, free, and genuinely good in independent tests. For many Australians it's all they need, especially combined with safe browsing habits and the ACSC's basic advice. macOS also has layered protections. A third-party product makes sense if you want extras like a VPN, password manager, ransomware shields or parental controls, or if you handle high-risk files regularly.
The point is to choose deliberately rather than installing antivirus out of habit, or because a JB Hi-Fi checkout suggested a boxed subscription.
Free vs paid antivirus and AUD pricing
Reputable free antivirus from vendors like Avast, AVG or Bitdefender covers core malware detection well. Paid tiers add a firewall, VPN, identity monitoring, multi-device cover and priority support, usually billed annually in AUD.
- Free: solid malware detection, occasional upsell prompts, no cost.
- Paid: typically around AUD 40 to AUD 120 per year depending on devices and features, GST included.
Decide based on whether you'll actually use the extras. Paying for features you ignore is wasted money, and many bundled boxed copies sold in stores cost more than buying direct online.
On-demand scanners for a second opinion
Even with real-time protection running, it's useful to keep an on-demand scanner like Malwarebytes Free for spot checks. It doesn't run constantly, so it won't conflict with your main antivirus, and it's handy if you suspect something slipped through after clicking a dodgy link in a text message, a tactic Scamwatch reports constantly with fake parcel and toll notices.
Scams, scareware and the fake "tech support" call
One of the oldest tricks is a pop-up screaming that your PC is infected and urging you to ring a number or download a "cleaner." In Australia these often impersonate Telstra, the NBN, Microsoft or even the ATO. They are scams. Real antivirus never advertises through alarming web pop-ups, and no legitimate company will cold-call to fix your computer. Report these to Scamwatch, hang up, and only ever download security software from the vendor's official site.
Don't run two real-time antivirus at once
Installing two full antivirus programs that both run in real time causes conflicts, false positives and serious slowdowns as they fight over the same files. Pick one for real-time protection. You can pair it with an on-demand scanner like Malwarebytes, which is designed to coexist peacefully. If a new laptop came with a 30-day trial you don't want, uninstall it before adding your chosen product.
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