the money raised by government through the imposition of TAXES. Tax revenue from income (INCOME TAX, etc.) depends upon the income TAX RATE and the level of TAXABLE INCOME, while tax revenue from expenditure (VALUE-ADDED TAX, etc.) depends upon the indirect tax rate and the level of taxable expenditure. Government's tax revenue varies with the level of economic activity, increasing during periods of prosperity when more people have jobs and taxable incomes and spend more.