The Federal Budget is more than $19 billion better off than forecast, boosted by economic growth and falling unemployment.
The final outcome for the 2017-18 budget showed a deficit of $10.1 billion - a $19.3 billion improvement on the predicted bottom line.
It's the smallest deficit in ten years
Treasurer Josh Frydenberg said the result showed the budget's "on path" to return to balance, as expected, in 2019-20.
"The economy is on track. It's growing strongly and it has good momentum," he said.
The $10 billion deficit is 0.6 percent of gross domestic product - clear evidence, the Treasurer said, the government's economic plan is working.
The outcome was boosted by company profits and a growing workforce, with revenues $13.4 billion higher than expected at the time of the budget.