Australian Treasurer Scott Morrison`s budget on Tuesday will double as an unofficial election campaign launch.
Small tax cuts and spending on health, infrastructure and education have already been foreshadowed or announced.
The cost of these will likely be offset by closing tax loopholes for multinational companies, ending some pension concessions for the wealthy and hiking tobacco taxes.
The opposition says the reforms are too modest and favour the wealthy.
Prime Minister Malcolm Turnbull will dissolve parliament and call an early election on or before 11 May. Australia will almost certainly go to the polls on 2 July.
Tuesday`s budget will form the backbone of the Liberal-led coalition government`s pitch to voters for re-election.
The treasurer and the prime minister say their budget will create additional jobs and grow the economy.
The government will create a A$5bn (US$3.8bn; £2.6bn) fund for critical infrastructure in cities, Mr Morrison announced on Monday.
There will almost certainly be small cuts in the company tax rate and those earning more than A$80,000 will also benefit as the earning threshold for the second-highest tax bracket is pushed higher.
Additional spending on health and education is also being promised, but at more modest levels than in the opposition Labor party`s proposals.
Labor has already announced a number of policies, including a plan to end "negative gearing" tax concessions for property investors buying existing homes that would raise money to pay for its spending.
The government opposes Labor`s policy to end negative gearing and says it will cause house prices to crash.
Mr Morrison`s budget announcement will begin at 19:30 AEST (10:30 GMT) on Tuesday.
- Prada seeks younger customers in bid for growth
- Lotte vice chairman Lee In-won found dead
- German business confidence falls post-Brexit, says Ifo
- Tesla touts speed and driving range with new upgraded battery
- Stocks creep up amid Fed limbo, dollar dips leftright 22leftright 12leftright
- China Crinkles Aluminum Foil Makers
- Cisco to lay off about 14,000 employees: tech news site CRN leftright 22leftright
- UK to avoid recession and world economy to ‘stabilise’ as Brexit shock passes - but US poses biggest risk to global growth
- Fuel prices push up UK inflation rate to 0.6%
- Rio 2016: Kohei Uchimura gets £3,700 Pokemon Go bill