The "impôt sur le revenu" (IR) is a tax on all income available to individuals in a year. With certain exceptions, net income is determined from total income, whatever its origin, after applying certain deductions, and then a single scale of taxation is applied. This scale is characterized by rates applied to slices of income according to the principle of progressivity. However, there are numerous provisions, so there are many systems of taxation depending on the type of income received. In addition, some income and capital gains are subject to a fixed rate of tax. The IR is payable each year on the total taxable income of the household. In 2007, proceeds from the IR amounted to €57 bn.