Here's what we do know about the package of measures the federal government will roll out to compensate for the impact of its carbon tax: more than half of the revenue of the tax will be used to assist low and middle-income households, largely through tax offsets and possibly through welfare increases.

"We expect that millions of households will be better off under the carbon price arrangements and the assistance will be permanent," Climate Change Minister Greg Combet told ABC Radio this morning, hinting that "one of the most efficient ways [of offering compensation] is through the tax and transfer system".