Jim Chalmers is no stranger to the dynamics and pitfalls of federal budgets. He has worked on 16 of them in and out of government – as a staffer, adviser, shadow minister and finally, this week, at the helm himself. On Tuesday, in delivering the first Labor budget in almost a decade, he turned convention on its head. Most obviously, he presented his fiscal reckoning just five months into the government’s term and well ahead of the traditional May scheduling. The treasurer was firmly of the view he couldn’t wait another seven months to tell Australians the true state of the economy.