The primary goal of a national tax system is to generate revenues to pay for the expenditures of government at all levels. Because public expenditures tend to grow at least as fast as the national product, taxes, as the main vehicle of government finance, should produce revenues that grow correspondingly. Income, sales, and value-added taxes generally meet this criterion; property taxes and taxes on nonessential articles of mass consumption such as tobacco products and alcoholic beverages do not.
In addition to producing revenue, tax policy may be used to promote economic stability. Changes in tax liabilities not matched by changes in expenditures cushion cyclical fluctuations in prices, employment, and production. Built-in flexibility occurs because liabilities for some taxes, most notably income taxes, respond strongly to changes in economic conditions. A more-active approach calls for changes in the tax rates or other provisions to increase the anticyclical effects of tax receipts.
Some economists propose tax policies to promote economic growth. This approach may imply a qualitative restructuring of the tax system (for example, the substitution of taxes on consumption for taxes on income) or special tax advantages to stimulate saving, labour mobility, research and development, and so on. There is, however, a limit to what tax incentives can accomplish, especially in promoting economic development of specific industries or regions. An emphasis on economic growth implies the need to avoid high marginal tax rates and the tax-induced diversion of resources into relatively unproductive activities.
