BC's carbon tax ceased being revenue neutral in 2013/14.

http://business.financialpost.com/opinion/how-b-c-s-formerly-revenue-neutral-carbon-tax-turned-into-another-government-cash-grab

"According to data from the government’s own projections, the carbon tax will result in a cumulative $865 million tax increase on British Columbians between 2013/14 and 2018/19. So much for revenue neutrality."