The Australian Council of Trade Unions will push for a five per cent increase in wages for low-paid workers.
If its submission to the Fair Work Commission's annual wage review is successful, would rise to $21.35, taking the full-year wage to $42,183.96.
One in four workers, or more than 2.5 million workers, rely on the annual wage review for pay rises.
The Australian Council of Trade Unions (ACTU) secretary Sally McManus said workers need a five per cent increase to keep ahead of rising inflation and living costs.
"We are calling on [Prime Minister] Scott Morrison to support the workers of Australia and back this pay increase," she said in a statement on Thursday.
"If this government is serious about addressing cost of living pressures, it starts with wage growth."
The federal government for the 2022/23 financial year, emphasising new measures to ease cost of living pressures.
These include a halving of the fuel excise to 22 cents per litre, a one-off $420 tax offset for 10 million low- and middle-income earners and a one-off $250 payment for pensioners, carers, veterans, job seekers, eligible self-funded retirees and concession cardholders.
The 2020/21 annual wage review delivered a 2.5 per cent increase to workers, equating to $20.33 an hour or $772.60 a week.
At that review, the ACTU argued for a 3.5 per cent rise while business groups proposed a 1.1 per cent increase.
Ms McManus said wages growth was lagging inflation forecasts, effectively cutting take home pay for an average worker by $500 in the first six months of this year.
"An increase of five per cent, that the ACTU will be arguing for, is what is needed to get real wages growing and to avoid further pay cuts," she said.
"The one-off payments of Morrison's federal budget will do nothing to generate the long-term, sustainable wage growth that workers need or stop the nation's workforce suffering another year of real wage cuts."
Federal Treasurer Josh Frydenberg said on Wednesday the measures were about helping change real people's lives, now.
"There is a need right now for this targeted, temporary, responsible support and what we have done in this budget is seen a material improvement to the bottom line," he told ABC Radio National on Wednesday morning.
Financial market economists fear annualised inflation could accelerate to at least five per cent from the current, high rate of 3.5 per cent.
