The $1.6 trillion Facebook and Instagram owner said a proposal to tax platforms 2.25% of all Australian ​revenue — including revenue unrelated to social media — was “indefensible” and went further than actions which had prompted a ​response by the US government.

Meta has previously said it opposed the so-called news bargaining incentive, for ⁠which Australia’s centre-left government is considering industry submissions.

But its latest missive shows how the law risks stirring ​up geopolitical tension between the allies.

The tax “plainly violates the commitments Australia and the United States made in their bilateral ​Free Trade Agreement, which commits Australia to grant American companies ‘treatment no less favourable’ than Australian peers”, Meta said in a blog post published on Thursday.

By drawing on the tech firms’ total domestic revenue, the Australian tax was “even broader than existing digital services taxes ​enacted by some governments, which resulted in the United States initiating trade actions”, the post added.

“We encourage any government ​considering a similar approach to look carefully at what this model actually represents.”

A spokesperson for Assistant Treasurer Daniel Mulino, who would ‌be ⁠responsible for overseeing the tax, said the government remained committed to the change and any takings would be distributed back to the news media industry.

The issue of making social media companies reimburse news outlets for content that drives clicks has been a point of contention between Australia and Meta since 2021, when the country became the first to ​pass a law forcing ​the platforms to negotiate deals ⁠or face government arbitration.

After briefly blocking all news feeds in Australia, Meta agreed on deals with most major outlets, but in 2024, it said it was stopping paying for ​news.

Instead of installing an arbitrator, the government said it would switch to a ​new model ⁠of charging a tax instead.

It also expanded the list of companies it applied to, from Meta and Google to Meta, Google and TikTok.

Google had struck deals under the previous model but had previously said it opposed the proposed tax.

Under ⁠the current ​Trump administration, Australia’s effort to regulate mostly US-based tech firms has ​emerged as a flashpoint.

A US congressional committee has called for Australia’s internet regulator to testify about what it has called a regime of censoring ​American free speech.

The regulator has not yet said if she will agree.