Unemployment is set to soar to its highest rate in almost three decades, with 1.4 million Australians expected to be out of work.

Key points: The unemployment rate will rise from 5.1 per cent to 10 per cent in the June quarter, according to Treasury figures

The unemployment rate will rise from 5.1 per cent to 10 per cent in the June quarter, according to Treasury figures But estimates show the rate would have been higher without the JobKeeper program

But estimates show the rate would have been higher without the JobKeeper program The Treasurer said the economic shock from coronavirus was set to be far more significant than the global financial crisis

New Treasury figures forecast the jobless rate will double in the June quarter from 5.1 per cent to 10 per cent, all but confirming Australia will enter a recession as it deals with the COVID-19 pandemic.

It will be the first time the unemployment rate has hit double digits since April 1994 and the figure is a fraction below Australia's peak unemployment rate of 11.2 per cent in 1992.

But Treasury's estimates show the unemployment rate would be much higher, and peak at 15 per cent, had the Government not intervened with the $130 billion wage subsidy program known as JobKeeper.

"The economic shock facing the global economy from the coronavirus is far more significant than what was seen during the global financial crisis over a decade ago," Treasurer Josh Frydenberg said in a statement.

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"Every arm of government and industry is working to keep Australians in jobs and business in business, and to build a bridge to recovery on the other side."

Treasury's estimate follows a similar prediction by Westpac, which had anticipated the economic impact of coronavirus could see Australia's unemployment rate rise as high as 17 per cent — a figure it revised down to 9 per cent once JobKeeper was introduced.

Economist Chris Richardson, from Deloitte Access Economics, said studies from Australia and overseas had shown if a person did not regain employment within two years of losing a job in a recession, they were unlikely to ever work again.

"So you're not just saving a job today … this is a lifetime of savings," Mr Richardson said.

More than 800,000 businesses have registered for the JobKeeper program, which will provide $1,500 per employee per fortnight to eligible businesses.

The first payments are expected early next month, backdated to March 30.

Up to 6 million workers, almost half the Australian workforce, are expected to benefit from the six-month wage subsidy.

Treasury's unemployment forecast comes just one week after credit ratings agency Standard and Poor's reaffirmed Australia's AAA credit rating but predicted Australia's economy would plunge into recession for the first time in three decades.