The Morrison government plans to pump $1.78 billion into the economy over the next 18 months through spending more on roads and rail projects and bringing other cash to the table faster.
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Scott Morrison is expected to announce the infrastructure deals he's struck with Queensland and Western Australia in a speech on Wednesday night.
That comes after the prime minister detailed on Monday his $415 million plan to make money available immediately to three road projects in South Australia - rather than in two to three years as was budgeted - and put extra funding towards other construction.
Announcements for the other states and territories are anticipated in coming days.
"This will support the economy in two ways - by accelerating construction activity and supporting jobs in the near term and by reaping longer run productivity gains sooner," Mr Morrison will say, according to draft speech notes provided to AAP.
The government has lionised its $100 billion infrastructure pipeline since the April federal budget but has faced criticism in recent months about the speed of its delivery.
Labor, big banks, economists and the Reserve Bank have called for the government to bring forward some of the planned projects to stimulate the economy.
But it has been protective of the slim budget surplus it expects to deliver this financial year.
Mr Morrison is expected to trumpet his successful economic management in the speech to the Business Council of Australia's annual dinner in Sydney, contrasting it with what he says is Labor's instinct to panic and spend.
"A panicked reaction to contemporary challenges would amount to a serious misdiagnosis of our economic situation," he will say.
"A responsible and sensible government does not run the country as if it is constantly at DEFCON 1 the whole time, whether on the economy or any other issue.
"It deals with issues practically and soberly."
Mr Morrison sees the expected surplus as a significant achievement that is "the product of difficult and disciplined choices over six successive coalition budgets", three of which he delivered as treasurer.
And the point of that surplus is to pay down the nation's debt and reduce the $19 billion in annual interest paid.
"It's not extra money that just lies around, squirrelled away for no good purpose, or like coins down the back of the sofa," he is expected to say.
Australian Associated Press