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A tax expenditure program is government spending through the tax code. Tax expenditures alter the horizontal and vertical equity of the basic tax system by allowing exemptions, deductions, or credits to select groups or specific activities. For example, two people who earn exactly the same income can have different effective tax rates if one of the tax payers qualifies for certain tax expenditure programs by owning a home, having children, and receiving employer health care and pension insurance. Static scoring perpetuates the assumption that tax expenditures have the same effect on the budget deficit as appropriations spending. A new tax expenditure program, say to encourage employment, that costs the government $500 million dollars in revenues has the same effect on the national deficit providing $500M in grants to businesses that hire the unemployed, only if the assumption holds that no increased economic activity results due to the incentives created by the tax expenditure. In some circumstances, increased economic interactions spurred on by tax expenditures can generate augmented revenues that more than offset the amount not taken by the government.
The History of Tax Expenditures 
In 1967, the tax expenditure concept was created by Stanley S. Surrey, former Assistant Secretary of the Treasury, as a way to represent the political use of tax breaks for means that were usually accomplished through budget spending. Secretary Surrey argued that members of Congress were using tax policy as a ``vast subsidy apparatus to reward favored constituencies or subsidize narrow policy areas. The Congressional Budget and Impoundment Act of 1974 (CBA) defines tax expenditures as "those revenue losses attributable to provisions of the Federal tax laws which allow a special credit, a preferential rate of tax, or a deferral of tax liability" (Surrey 1985). They are equally common in other countries.
The Process of Tax Expenditures 
The Congressional Joint Committee on Taxation (hereafter JCT) annually estimates tax expenditures in terms of revenues lost to the U.S. Treasury for each special tax provision included in the U.S. tax code. In 2009, the JCT listed over 180 tax expenditure programs that cost the U.S. government over $1 trillion dollars in revenues. Their cost varies with the level of economic activity. A major tax expenditure is enjoyed by tax payers who own their own home and can deduct the interest on their mortgage payments. Since tax expenditures are claimed against a progressive tax code, individual tax expenditure programs are worth more to wealthier taxpayers. The majority of tax expenditure programs are targeted for private social benefits and services. The administration of tax expenditures falls on the IRS, and is not accounted for.
The Politics of Tax Expenditures 
Tax expenditures are considered "off-budget" spending by most economists and budget experts. Tax expenditures are easier to pass through Congress than increases in appropriations spending. They are easily seen as free benefits, when government grants are viewed as giveaways. Unlike direct spending, tax spending must only pass through two committees, the House Ways and Means and Senate Finance. Tax expenditure programs, once in the tax code, do not come up for annual review and can only be removed through tax legislation. Tax expenditure programs are a form of entitlement spending in that every tax payer that qualifies can claim government money. Faricy (2011) demonstrated that when tax expenditures are counted as a type of government spending, Democratic and Republican parties are indistinguishable in annual changes to federal government spending. This study also finds that Republicans are more likely to increase tax expenditures when in control of government thereby subsidizing the activities of businesses and the wealthy. Jacob Hacker (2002) shows that the federal subsidization of private health insurance has grown over the years and has made efforts for nationalized health care more difficult. Ellis and Faricy (2011) find that when tax expenditures rise, public opinion adjusts and becomes more liberal to counteract the conservative policies.
- ^ Surrey 1973, p. 6
- ^ Christian M.A. Valenduc, Hana Polackova Brixi, Zhicheng Li Swift: Tax Expenditures - Shedding Light on Government Spending Through the Tax System: Lessons from Developed and Transition Economies; World Bank Publications, 31 Jan 2003
- ^ Thomas L. Hungerford: Tax Expenditures and the Federal Budget; Congressional Research Service, RL34622, 1 June 2011.
- ^ Burman, Leonard E; Geissler, Christopher; Toder, Eric J (2008). "How Big Are Total Individual Income Tax Expenditures, and Who Benefits from Them?". American Economic Review 98 (2): 79–83. doi:10.1257/aer.98.2.79. JSTOR 29729999.
- ^ a b Faricy 2011
- ^ Howard 1997
- ^ Leonard E. Burman: Is the Tax Expenditure Concept Still Relevant?; National Tax Journal, September 2003
Further reading 
- Faricy, Christopher (2011). "The Politics of Social Policy in America: The Causes and Effects of Indirect versus Direct Social spending". The Journal of Politics 73 (1): 74–83. doi:10.1017/S0022381610000873.
- Ellis, Christoper and Christopher Faricy. 2011. Social Policy and Public Opinion: How the Ideological Direction of Spending Influences Public Mood. (Forthcoming at The Journal of Politics).
- Hacker, Jacob S. 2002. The Divided Welfare State: The Battle over Public and Private Social Benefits in the United States. New York: Cambridge University Press.
- Howard, Christopher. 1997. The Hidden Welfare State: Tax Expenditures and Social Policy in the United States. Princeton: Princeton University Press.
- Surrey, Stanley S. 1974. Pathways to Tax Reform: The Concept of Tax Expenditures. Cambridge. Harvard University Press.
External links 
-  - The Joint Committee on Taxation
-  - A Briefing Book on Tax Expenditures by the Tax Policy Center
-  - The largest tax expenditures according to the Tax Policy Center.
-  - Data on Tax Expenditures from the JCT
-  - Article from the Center for American Progress