Taxation is crucial to the functioning of the modern state. Tax revenues pay for public services - roads, the courts, defence, welfare assistance to the poor and elderly, and in many countries much of health care and education too. More than one third of national income in the industrialized (OECD) countries is on average taken in taxation. Taxes affect individuals in many ways. Taxes paid on income and spending directly reduce taxpayer disposable income, taxpayers face the hassle of tax returns and making payments, and they may be anxious about the possibility of investigation and...