The State Liberal Party has received more than half of all political donations and gifts in the financial year leading up to the March 9 election.
The Electoral Commission says the Liberals received almost $3.9 million compared with the Australian Labor Party's total of $1.85 million and the Greens' $355,000.
But the National Party was the biggest improver, doubling donations and income in 2011-2012 to $1.33 million from its usual average of $600,000.
Despite having no members in parliament, the Australian Christians have also bolstered their financial support, from an average of about $200,000 a year to $281,000 this year.
The Liberal Party received the largest single gift of $250,000 from Furama Pty Ltd.
The ALP scored its two biggest contributions from union groups United Voice and the Shop, Distributive and Allied Employees Association which totalled $215,000.
WA Electoral Commissioner Warwick Gately said overall party income was down from the previous financial year when $11.2 million was received, compared with the $7.6 million revealed in the latest figures.
Last year, the top 10 donations were each over $100,000, he said in a statement yesterday.
"It is cyclical. At both State and Federal levels, last financial year was between elections," Mr Gately said.
"But with potentially big donations in the lead-up to the March state poll I would expect receipts to jump significantly in the current year."