Treasurer Josh Frydenberg on Wednesday outlined a plan to phase out billions of dollars in federal cash assistance once 70 and 80 per cent of over-16s are immunised.

The COVID disaster payment provides $750 a week for people who have lost more than 20 hours of work and $450 for those under that threshold.

People on income support who lose eight hours can access $200 a week.

But once a state reaches 70 per cent two-dose vaccination coverage, workers will have to reapply each week for the payments to prove they are eligible.

At 80 per cent, there will be a two-week transition to support being cut off.

More than 1.5 million Australians living under lockdowns in NSW, Victoria and the ACT are receiving the payments.

Frydenberg said restriction-ending road maps showed people would be back at work and businesses reopened.

“These COVID disaster payments, these business support payments have been emergency payments and we can’t continue them forever,” he said.

“Nor can we continue lockdowns forever. If you look abroad, the United Kingdom, Canada, the United States – countries are starting to live with COVID.”

Australian Council of Social Service chief executive Cassandra Goldie said there was a gaping hole in income support payments for people hardest hit by the pandemic.

“It’s unconscionable to be cutting off payments to people on low-payments when the government is not ensuring safe vaccination rates,” she told AAP.

Co-funded federal business support payments will also taper off under agreements to be worked out with states and territories.

In the first week after a state of territory hits 80 per cent vaccination coverage, people who have lost more than eight hours work will receive a $450 payment.

Those on income support will have their assistance halved to $100.

In week two, the payment will mirror JobSeeker at $320 and be ended for income support recipients.

The pandemic leave disaster payment for workers forced to isolate or care for someone with coronavirus will remain until the end of June next year.

Finance Minister Simon Birmingham said that would help people affected by localised lockdowns, which are possible under the national reopening plan.

“We are leaving that in place all the way through until July next year, as a certainty measure there of ongoing assistance in those particular cases of isolation requirements,” he told the ABC.

Senior Labor frontbencher Tanya Plibersek is concerned with some restrictions remaining in place at 80 per cent vaccination coverage, people could be left behind.

“We don’t want to see support withdrawn from those areas too quickly,” she told Sky News.

Plibersek said $13 billion in JobKeeper wage subsidies that flowed to companies which boosted revenues during the pandemic could have been used on continued targeted support.

The treasurer said separate economic support for sectors with ongoing struggles like hospitality and tourism would be considered.

More than $9 billion has flowed to locked-down workers since COVID disaster payments started in June.

Australia has fully vaccinated more than 52.5 per cent of its population aged 16 and above.