That's the bold prediction of Treasurer Josh Frydenberg and his department, underpinning much of the government's economic recovery plan.

So far 2.7 million doses have gone into Australians' arms, but the rollout's weekly pace will need to triple if Mr Frydenberg is to be believed.

"The vaccine is likely to be rolled out by the end of this year to all those Australians who want that vaccine," he told reporters on Tuesday.

"There is the assumption they will get two doses by that time."

He noted it was based on "those who seek to have the vaccine" rather than the entire Australian population.

Australian Medical Association president Omar Khorshid said the prediction was "not ridiculous".

"But it will be a huge challenge for us to get the whole population vaccinated, both doses, by the end of the year," he told AAP.

He said the rollout would ramp up "very rapidly" in the last quarter of this year when Pfizer, which has its second dose within three to six weeks, will be the mainstay vaccine.

Dr Khorshid was concerned the hospital system may not cope with the next flu season running in parallel with COVID-19.

Labor frontbencher Katy Gallagher, who heads a committee examining the pandemic response, said the government had yet to come clean on the cost and risk of delays in the vaccine rollout, and had failed to deliver fit for purpose quarantine facilities.

Treasury expects international travel to "remain low" through to mid-2022 after which a gradual recovery in international tourism is assumed to occur.

"The rate of international arrivals will continue to be constrained by state and territory quarantine caps over 2021 and the first half of 2022, with the exception of passengers from safe travel zones," the budget papers say.

Finance Minister Simon Birmingham said trying to predict the reopening of Australia's border to the rest of the world was an "imprecise business".

But he said it would be done "as early as possible but no sooner than it is safe to do so".

The cautious approach on travel comes as the government revealed it would spend an extra $1.9 billion over the coming year to boost its COVID-19 vaccine supply to 170 million doses and speed up the rollout.

As well, the budget papers confirmed a plan to investigate domestic manufacturing of mRNA vaccines.

The plan - led by the federal industry and health departments - would complement the existing CSL facility in Melbourne, which makes the AstraZeneca viral vector vaccine. It would also ensure Australia is not at risk of blockages of supply from overseas.

The budget papers said a funding figure could not be put on the project due to "commercial in confidence sensitivities".

The Howard Springs facility in the Northern Territory, which is housing Australians returning from overseas, will cost $487 million over two years as it is expanded to 2000 places.

Part of the cost will be offset from people paying for their stay at the facility.

There will also be $879 million provided over two years to support access to health care services and reduce the risk of community transmission of COVID-19.

The funding covers subsidising testing and detection of the virus, telehealth services and operating dedicated commonwealth respiratory clinics.

The budget sets aside $37.1 million over two years to support India with urgently needed medical supplies.

Australian Associated Press