Labor says the prime minister has put politics ahead of policy in moving the budget forward a week to May 3 and threatening a July 2 double-dissolution election.
"Malcolm Turnbull's decision to bring forward the budget is all to do with politics and nothing to do with the economy or tax reform," shadow treasurer Chris Bowen said in a statement on Monday.
It is the first budget to be brought forward since Arthur Fadden's in 1952.