Casual workers who want financial help as they isolate themselves or seek medical treatment for coronavirus will have to apply for Centrelink to access the government's Sickness Allowance, which will be abolished and rolled into another payment in just over a week.

But it will take up to five days to get registered with Centrelink, and they may have to wait up to 13 weeks if they have money in the bank.

Prime Minister Scott Morrison said on Thursday that casual workers who were affected by coronavirus would be able to apply the long-standing Sickness Allowance payment.

Prime Minister Scott Morrison announced a multibillion-dollar stimulus package in Canberra on Thursday. Credit:Alex Ellinghausen

"It is a Newstart-level payment and people who are casual employees that wouldn’t be able to go to work or because they have to self-isolate or, indeed, have the virus, they would be able to access that payment," Mr Morrison said.