Both major parties are under pressure to outline the cost of their promises ahead of the May 18 election, with climate change and tax cuts in the spotlight.
The opposition's much anticipated costings will be released on Friday, as leader Bill Shorten continues to face pressure over his party's climate plan.
Deputy Labor leader Tanya Plibersek says the cost of Labor's 45 per cent emissions reduction policy will be just over $500 million, but admits the impact on the economy is different.




