Labor's election commitments will cost state taxpayers $3.4 billion over the next three years if it is re-elected for a third term in office in Western Australia.
Cost-of-living relief, housing, health and education have all been targeted in the lead-up to the poll on Saturday.
Treasurer Rita Saffioti also zeroed in on training, local manufacturing, infrastructure, law and order and transport.
"I'm really confident on the figures, because we still have a very conservative budgeting system in relation to, in particular, commodity prices," she said in Perth.
Ms Saffioti spruiked WA's strong economic performance in recent years and her party's track record since winning office in 2017.
"We've been able to cut debt, even after eight years of record infrastructure spend, and also after accommodating all of our commitments," she said.
Net debt is expected to climb from $33.8 billion in 2024-25 to $40.9 billion in 2027-2028.
Opposition and National Party leader Shane Love said there was a more than $2 billion difference between Labor's election promise announcements and the figures it submitted to the WA Treasury Department.
"WA Labor has promised big cash splashes via media releases and press conferences, only to quietly submit smaller figures to Treasury, hiding the true cost of their commitments," he said.
"These inconsistent costings suggest these projects either will not be delivered in the next term of government or will require additional taxpayer funds to deliver."
Premier Roger Cook visited Albany in WA's south, where he again pitched Labor's key commitment to diversify the state's economy by developing the manufacturing sector.
"Under our WA Labor 'Made in WA' plan, we are going to bring manufacturing back to the heart of the Western Australian economy," he said.
"We'll do more things to create local jobs and to keep the economy strong and build more things here."
This includes investing in wind turbine and household battery manufacturing, the wine industry, renewable energy products and freight rail network.
Mr Cook also addressed calling US Vice-President JD Vance "a knob" during a speech at a business breakfast on Tuesday, which he later apologised for.
"The consensus after 24 hours since I made those comments is that it was a very poor choice of words and a very popular choice of words," he said.
"These things happen from time to time and, you know, it was lighthearted, no malice was intended, maybe I'm the knob."
The WA Liberals focused on health as the party reaffirmed its commitment and plans to reduce ambulance ramping.
Liberals leader Libby Mettam said if her party was elected, ambulances with low-priority patients would be sent to privately owned urgent care clinics for treatment.
"Every hour an ambulance is ramped represents a patient who is waiting for urgent care," she said.
"Free access to urgent care clinics, and the expansion of urgent care clinics, according to St John, will immediately reduce ambulance presentations by about 20 per cent."
Experts are tipping a comfortable win for Labor. The party holds 53 of 59 seats in the lower house after an unprecedented landslide victory in 2021.
The Liberals are expected to release election commitment costings on Thursday.
The Nationals are the official opposition party in WA after winning four seats to the Liberals' two seats in the last election.
But Ms Mettam is viewed as the alternative premier and her party is expected to be the opposition after the election.
