OTTAWA — The federal carbon tax will have a negative economic impact on Canada’s real gross domestic product (GDP) of $25 billion, or approximately one per cent, in 2030 according to the government’s own internal data it released on Thursday.

Those numbers, which were shared with the Parliamentary Budget Officer (PBO) last month on the condition they remain confidential, were published as Conservative Leader Pierre Poilievre was about to deliver a speech to call on the government to disclose them publicly.