First the Public Accounts Committee started investigating the tax status and contributions of multinationals, with major players like Google, Amazon and Starbucks probed and interrogated over their international tax activity. Then it was the Big Four and the tax lawyers. Now the House of Lords has convened a series of hearings on taxing corporations in a global economy, which asks whether a new approach is needed. The agenda is rather ambitious, covering everything from assessing what proportion of tax receipts should come from corporation tax to questioning whether the current complex definition of profits is the right basis for calculating corporation tax.