Opposition parties are united in slamming the NDP over a leaked report from the fall, detailing what effects the upcoming carbon tax would have on Alberta’s economy.

The report by the NDP’s own finance officials was obtained by Postmedia and says there would be $4 billion in lost household income, lower growth and 15,000 job losses.

Deputy Premier Sarah Hoffman repeated the party’s stance on Friday that the report was based on out-of-date projections.

“It was based on a hypothetical from a scenario that could’ve been derived from the independent report on climate change, it certainly had nothing to do with actual government policy or decision that are being made,” she said. “The numbers that were made public certainly aren’t the numbers or the assumptions that have guided the Climate Leadership Plan.”

Hoffman said every dollar being brought in from the tax will either be rebated back to families, used to cut the small business tax or back into diversification.

Hoffman said up-to-date figures came out on Page 60 of the Fiscal Plan two months ago and when asked if she thought the report would have long-term negative impacts on the party, she said the real long-term negative impact would be failing to do anything on climate change.

But the Wildrose, PCs and Liberals are demanding more from the government.

Wildrose Leader Brian Jean said in a release that Albertans deserve better following the loss of thousands of jobs, yet the NDP refuses to release real numbers.

That was echoed by MLA Leela Aheer, speaking with reporters on Friday.

“During the debate, we asked them for where we were starting, where we were going and how it’s going to end up, because if this is actually to bend behaviour, Albertans need to know how that’s going to work,” she said. “To find out on top of that that more job losses were already in the works, that $4 billion of taxes are going to be less, I mean these are huge numbers.”

“How can you just hold on to that information?”

PC Leader Ric McIver said in a release that Environment Minister Shannon Phillips should release more internal data.

“This leaked report shows that from the very beginning, the NDP government hasn’t been honest with Albertans when it comes to the true costs of both the carbon tax and the overall climate leadership plan,” McIver said. “We are deeply troubled by the fact that instead of coming clean with Albertans about the real economic impacts of their plan, the Minister has doubled down on her deception by denying the existence of current data.”

Liberal Leader David Swann said the message of ‘Just Trust Us’ isn’t good enough.

“Even now, the NDP is disputing the accuracy of the report but have not produced updated figures. We are told, yet again, that all will be made clear in the next budget, the next business plans and in the coming years,” Swann said in a statement. “Albertans deserve the right to make informed decisions and they deserve the right to a transparent process.”