Centre for Tax Policy and Administration:rnrnIn a drive to encourage risk-taking, entrepreneurship and competitive fiscal advantage, many OECD countries have reformed their personal income tax system fundamentally over the last two decades. At the same time, governments are aware that they must maintain taxpayer?? faith in the integrity of their tax systems to fund public spending. Fairness and simplicity have become the byword of reformers, but the double challenge has meant that no clear consensus has emerged on an ideal personal income tax.