<p>Not only is excessive consumption of sugar-sweetened beverages (SSB) harmful for health but it also constitutes a significant burden on Australia’s healthcare system, with widespread social, economic, and ethical implications. Peak health authorities in Australia and the Grattan Institute have advocated strongly for implementing a tax on SSB to reduce its consumption, based on evidence of compelling health and economic benefits. However, beverage and sugar industries heavily oppose the tax. This article analyses the implementation of an SSB tax in Australia using a set of widely accepted public health ethics principles: effectiveness, proportionality, necessity, least infringement, equity, and transparency. By navigating the moral framework of key ethical issues, this article argues that Australia is justified in implementing an SSB tax, thus adding a nuanced ethical dimension to this important public health policy debate.</p>