What happened:

…based their high-profile analysis of the federal fuel charge — commonly known as the carbon tax — on calculations that included more than just the federal fuel charge.

It turns out the PBO’s complex computer code had actually included the federal output-based pricing system — commonly known as industrial carbon pricing — when it wasn’t supposed to.

The new numbers is not going to available for a while:

As we’ve heard, Giroux doesn’t think the “economic” costs will be all that different once the PBO is done rerunning all its mathematical models in several months’ time.