PricewaterhouseCoopers (PwC), one of the big four accountancy and auditing firms. Photograph: Philip Toscano/PA Wire

Regulators need to focus more intently on the facilitation of tax avoidance globally by the giant big four accountancy firms , a report commissioned b(...)

Minister for Finance Michael Noonan with secretary-general Angel Gurria during an OECD meeting at EU headquarters in Brussels last month. Photograph: Dursun Aydemir/Anadolu Agency/Getty Images

Some of the key ideas governing how multinational business is taxed are being questioned in a project being run by the Paris-based Organisation(...)