Federal Parliament is back this week for a final few days before the country heads off to the polls, with the government hoping to use tomorrow's budget as a springboard for a successful re-election campaign.

In turn, Labor has set up a showdown with the Coalition over climate change by releasing key elements of its 45 per cent emission reduction policy.

With the May election the backdrop to everything that happens from here-on-in, Bill Shorten has declared Labor is primed for government.