Clegg will say that these are real tax cuts, "big, permanent and fair", that would benefit those who need help.
He will also call for the government to clamp down on tax havens.
"There's a particular UK responsibility here, since half the world's significant tax havens are under British sovereignty," he will say.
"I know tighter regulation of offshore companies and banks will be painful for some small Commonwealth states and British dependencies. But it has to happen.
"Up to £40bn is lost every year in the UK alone through tax avoidance, much of it through offshore havens. That's money that should be recycled into tax cuts for ordinary families."
There are strong hints of the impact of the arguments in this blog in there. I can live with that.