An open letter addressed to Prime Minister Anthony Albanese and signed by more than 300 people said it was long past time to address the structural injustice of welfare payments.

Last week, the government's economic inclusion committee recommended a substantial increase to the JobSeeker payment and related working age payments as a top priority.

Independent senator David Pocock said he would be disappointed to see the government ignore expert advice in the budget which will be handed down in the second week of May.

"It shouldn't take independents to negotiate a deal for the government to look after Australians. It's frankly ridiculous," he told reporters in Canberra.

Four government backbenchers Alicia Payne, Kate Thwaites, Louise Miller-Frost and Michelle Ananda-Rajah signed the open letter along with Liberal MP Bridget Archer, independents and Greens MPs on the cross bench.

Australian Council of Social Service chief executive Cassandra Goldie said MPs who supported raising the rate had listened to their communities.

The current JobSeeker payment amounts to about $50 a day, which Dr Goldie said was unacceptable for a country as wealthy as Australia.

She said ACOSS was keenly watching every word from decision makers in the lead-up to the budget.

"This is a live debate ... I don't think (an increase) has been ruled out," she said.

Mr Albanese said he understood the struggles people were facing due to the cost-of-living crisis, and the budget measures had not yet been finalised.

"I know what it is like to grow up in a household reliant upon a pension ... and I know the pressure that can place people under," he told reporters in Sydney.

"What we will be doing in the budget is balancing the need to provide cost-of-living relief for people while making sure we show restraint so we don't add to inflationary pressure."

Treasurer Jim Chalmers said the budget would prioritise the most vulnerable Australians.

"I recognise that it is tough to live on the JobSeeker payment and that's why we want to move as many people as we can off that payment and into good, secure, well-paid jobs," he told reporters in Sydney.

"I have a lot of respect for the people who have made this suggestion in the letter that has been released. These are good people making suggestions in good faith."

Dr Chalmers said he needed to weigh up competing demands on the government while also being fiscally responsible.

Grattan Institute chief executive Danielle Wood, Australia Institute executive director Richard Denniss and former Treasury secretary Ken Henry were among the prominent economists who backed the call.

ACTU president Michele O'Neil, human rights activist Craig Foster, Indigenous academic Megan Davis and Climate 200 convenor Simon Holmes a Court also signed the open letter.

Australian Associated Press