When the government went about drafting new tax avoidance laws in 2014, it turned to the big consulting firm, PwC, to help put together the best policy possible. 

But it had no idea the very firm it was paying to do that would use the highly confidential information it obtained to try to help its own multinational clients avoid the new tax. 

Today, ABC business reporter, Daniel Ziffer, on the evolving scandal, and whether Australian taxpayers are being ripped off. 

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Daniel Ziffer, ABC business reporter