The former head of international tax for PwC Australia, Peter Collins, has been deregistered by the Tax Practitioners Board for dishonesty and for sharing confidential government briefings with PwC partners and clients.

The TPB, which oversees Australia’s 80,000 tax agents, also sanctioned PwC for failing to regulate conflicts of interest by partners and PwC staff, who knew the confidential information would be used to help clients sidestep new tax laws and to attract new clients.