Labor won't block supply but will scrutinise the budget for its fairness, Opposition Leader Bill Shorten has vowed.
Prime Minister Malcolm Turnbull wants the budget appropriations bills, which will be delivered next Tuesday, dealt with next week "in the appropriate way".
The government will need at least interim budget bills passed by May 11 - the deadline for Mr Turnbull to call a double-dissolution election for July 2.
The lower house is scheduled to sit for four days next week but the Senate will only sit for three days before going into two days of budget estimates hearings.
This leaves Monday, Tuesday and Wednesday of the following week to pass budget bills.
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Mr Shorten declined to say whether Labor would agree to pass the bills quickly.
"Let's see what's in their budget," he told reporters in Gatton on Wednesday.
"We won't block supply."
The Labor leader said the opposition had concerns about tax cuts for the wealthy and not doing enough to tackle multinational tax dodgers.
"I don't think it's right that the very wealthy in Australia are getting a disproportionate amount of taxpayer subsidies and you've got everyday Australians ... facing the prospect of not having their schools properly funded, of not having hospitals properly funded," Mr Shorten said.
