NSW short-changed in federal budget: Labor

The federal budget has let down NSW, according to the opposition, which has accused Premier Gladys Berejiklian of failing to stand up for her state.

NSW received just $1.5 billion of the almost $25 billion set aside in Tuesday night's federal budget for infrastructure projects Australia-wide.

Opposition treasury spokesman Ryan Park said the modest allocation of federal funds was evidence Ms Berejiklian had let her state down.

"Gladys has failed to stand up for NSW," Mr Park tweeted.

"This Budget shows that the Turnbull Government just doesn't trust Gladys Berejiklian when it comes to spending taxpayer dollars on major infrastructure projects," he said in a statement on Wednesday.

NSW Treasurer Dominic Perrottet, however, is optimistic about the budget, saying it's responsible and forward-focused, which will ensure "more Australians get to keep more of their hard-earned money".

"It also supports key projects across NSW and will help our state remain the beating heart of the national economy, driving Australia forward," Mr Perrottet said in a statement.

Canberra has set aside $50 million for a business case into a rail line from St Marys to Western Sydney Airport, matching the state government's contribution.

About $971 million of the money being handed to NSW is slated for a road that bypasses Coffs Harbour's famed Big Banana.

The budget also confirmed NSW will get $4.02 billion for sale of its share of Snowy Hydro to the Commonwealth.

The state will also have access to a $1 billion congestion fund "to support projects at a state level to fix pinch points and improve traffic flow and safety in our cities", Treasurer Scott Morrison told parliament.

The state's peak business organisation said the budget was a "solid economic blueprint" but needed more measures to tackle business debt and support small businesses.

NSW Business Chamber chief executive Stephen Cartwright said NSW was a victim of its own prudent economic management and discipline when it came to infrastructure.

"The inactivity of other state governments over recent years seems to have been rewarded by the federal government, keen to ensure road and rail projects are commenced across the nation," Mr Cartwright said in a statement.