Treasurer Scott Morrison has laughed off suggestions he will hand down a "Santa Claus" budget next month.
Acting Prime Minister Michael McCormack has foreshadowed his "Father Christmas" cabinet colleague will craft a federal budget focused on infrastructure.
Mr Morrison took the comparison in his stride, but insisted he would be responsible.
"I'm not Santa Claus - it won't be Christmas in May - but I don't intend to be the Grinch either," he told ABC radio on Tuesday.
"What we will have is what we've always produced, and that is a responsible budget with measures the country can afford that are about investing in a stronger economy."
Mr McCormack said the budget would allocate "a record spend" in excess of last year's $75 billion for road and rail projects, and promised that no states or territories would be left out.
"On May 8, as on December 25, Scott 'Santa Claus' Morrison will be announcing some goodies," he told The Daily Telegraph.
"There's going to be some exciting projects elsewhere that have been called upon for many years that will be realised by this budget. We want people to cheer this budget home."
But Mr Morrison said his biggest single infrastructure announcement had already been made public - $5 billion for a rail link from Melbourne Airport to the CBD.
© AAP 2018