The WA Premier and Opposition Leader say they do not expect today's federal election announcement to distract from the state election campaign.

The Prime Minister Julia Gillard made a surprise announcement today that federal elections will be held on September 14.

The WA Premier Colin Barnett says he does not think it will distract from the state elections on March 9.

"I think it's the right decision to set the election date earlier," he said.

"I would actually go further and have a fixed election date for federal elections as we have introduced into Western Australia."

The Opposition Leader Mark McGowan says he is not concerned either.

"It makes it completely clear," he said.

"You can vote on federal issues in September, you can vote on state issues in March.

"The two campaigns should not be confused and I'm sure West Australians completely and utterly understand that."

The federal member for O'Connor, Tony Crook, says while he is surprised by the early announcement of the election date, he thinks it creates certainty.

The WA Nationals MP says he was not expecting the announcement but he sees the benefits in it.

"I think in many respects it's a good thing," he said.

"It gives us some certainty about where we're heading, people can plan, people can make up their own minds about why it has been done.

"For me it's business as usual."