ACTU secretary Sally McManus and president Michele O'Neil announced on Monday night they will step down from the peak union body, ending an eight-year leadership partnership that was the first all-female team in the organisation's 99-year history The Guardian.

The pair broke the news via a farewell video posted to social media. McManus, 54, will depart in August 2026. O'Neil, 64, will leave before the end of the year, staying on to help the new secretary settle in The Guardian; The Age.

The timing is staggered, and deliberately so. McManus goes first; O'Neil remains to manage the transition rather than leaving the building empty. For an organisation that sits at the centre of the Labor movement's institutional architecture, a handover period of several months is standard practice and reduces the risk of a vacuum that affiliate unions could exploit to jockey for position.

McManus and O'Neil took the ACTU's helm in 2017. Over eight years their policy agenda delivered a string of legislative wins that materially reshaped the industrial relations landscape: right to disconnect laws, same job same pay protections closing the labour-hire loophole, criminalisation of wage theft, and minimum pay, insurance and safety standards for gig economy workers The Guardian. In the farewell video, McManus pointed to union membership growth and more than 47 new workplace rights secured under their watch.

Prime Minister Anthony Albanese moved quickly to frame the departure, describing McManus and O'Neil as personal friends and "giants of the labour movement." He credited their leadership with significant wage increases in undervalued sectors, the gender pay gap at a record low, and union membership growing for the first time in decades The Guardian.

That tribute carries political weight. The Albanese government's industrial relations agenda and the ACTU's legislative wishlist have been closely aligned, and Albanese's framing of the departures as a victory lap rather than a retreat signals the government wants the policy legacy locked in before any successor recalibrates.

O'Neil appeared on ABC Radio RN Breakfast on Tuesday morning to discuss the resignation. She told the program that new leadership would be "the best thing for workers" and "the best thing for the union movement" The Guardian. That is a notable framing. Leaders stepping down rarely volunteer that their departure is good for the movement unless they are pre-empting a narrative that it isn't.

The leadership change comes at a pointed political moment. The ACTU recently began targeting Pauline Hanson and One Nation as the biggest political threat to Labor The Guardian. That shift in the ACTU's threat assessment — away from the Coalition and toward the right-populist crossbench — tells you the political environment the incoming leadership will inherit is not the same one McManus and O'Neil walked into. The industrial relations gains of the past term are largely legislated. The next fight is electoral, and the enemy has moved.

For the government, the departures remove two of its most effective external advocates at a time when the political contest is widening beyond the traditional Labor-Coalition axis. For the union movement, the question is whether a successor can hold the affiliate coalition together while pivoting to a campaign against a threat that some unions may not see as their primary target.

The succession process itself will be the first real test. The ACTU secretary is elected by the executive, which is in turn shaped by the relative weight of affiliated unions. McManus's successor will need to command majority support across a diverse and occasionally fractious membership, from the CFMEU to the SDA. Whoever emerges will inherit a policy legacy that is substantial but largely complete — and a political fight that is only beginning.