Victoria is set to get just 77¢ of every $10 handed out by the Commonwealth for infrastructure, prompting further claims that the Turnbull government is overlooking Australia's fastest-growing state.

The federal Treasury's budget update has revealed just $2.05 billion has been set aside for Victorian road, rail and regional projects over the four-year budget period.

That represents 7.7 per cent of the national total – well below the state's one-quarter share of the national population. A total of $26.4 billion has been set aside to state infrastructure projects, although about $2.3 billion of that remains unallocated.

In contrast, the federal government has set aside almost $8 billion for NSW, more than 30 per cent of the national total. Queensland, which is also seen as crucial to the Coalition's electoral fortunes, will get a 29 per cent slice, while Western Australia will get 12.2 per cent.