GST push to follow SA budget, treasurer says

SA Treasurer Tom Koutsantonis handed down the budget on Thursday. (ABC News: Che Chorley)

Treasurer Tom Koutsantonis is pushing to secure SA's share of GST money, which will account for around 30 per cent of state revenue in the next financial year.

The opposition says a recent GST "windfall" should be used to counter the state's debt, which is expected to hit $53 billion within the next few years.

The federal government's "no worse off" guarantee to compensate states for WA's favourable GST share is set to end in 2030.

A day after the South Australian budget, Treasurer Tom Koutsantonis has foreshadowed a push to secure the state's share of GST revenue over the long term, calling on MPs across the political spectrum to step up advocacy efforts.

But the opposition has criticised the way in which GST money is being used, saying the government should be putting it aside to counter soaring debt.

GST is set to account for around 30 per cent of the state's revenue next financial year, but the federal government's "no worse off" guarantee to compensate other states for Western Australia's favourable share is set to expire in 2030.

The SA government has handed down its first budget since winning the March election in a landslide.

According to the budget papers, South Australia will benefit from a "stronger national GST pool" over the next three years, with GST grant revenue forecasts revised up since the mid-year budget review by $794 million.

But the picture is different on a proportional basis, with the budget forecasting SA will receive "around 9.8 per cent" of the total GST pool in the next financial year — "a lower share to that received in 2025-26".

The treasurer said the government would be pushing "very hard" to secure the state's slice of GST revenue, and urged his political rivals in SA to do the same.

"I've seen a lot of advocacy from Western Australia and Western Australian MPs about the importance of GST to Western Australia," Mr Koutsantonis said.

"Well, it's important to South Australia too — it's important to Victoria, it's important to New South Wales. We want to see more of it.

"You're going to see a much more prolific attempt by the government to make this known."

Mr Koutsantonis has foreshadowed a push to secure the state's GST share. (ABC News: Che Chorley)

Asked whether the government would launch a campaign for GST revenue, Mr Koutsantonis replied: "You'll be seeing more about that in the coming days and weeks."

The state's net debt is expected to hit $53.6 billion by 2029-30 — a figure the government said was being driven