In
American public finance
Public finance is the study of the role of the government in the economy. It is the branch of economics that assesses the government revenue and government expenditure of the public authorities and the adjustment of one or the other to achi ...
, discretionary spending is
government spending
Government spending or expenditure includes all government consumption, investment, and transfer payments. In national income accounting, the acquisition by governments of goods and services for current use, to directly satisfy the individual ...
implemented through an
appropriations bill
An appropriation, also known as supply bill or spending bill, is a proposed law that authorizes the expenditure of government funds. It is a bill that sets money aside for specific spending. In some democracies, approval of the legislature is ne ...
.
This spending is an optional part of
fiscal policy, in contrast to
social programs for which funding is mandatory and determined by the number of eligible recipients.
Some examples of areas funded by discretionary spending are
national defense
National security, or national defence, is the security and defence of a sovereign state, including its citizens, economy, and institutions, which is regarded as a duty of government. Originally conceived as protection against military att ...
,
foreign aid
In international relations, aid (also known as international aid, overseas aid, foreign aid, economic aid or foreign assistance) is – from the perspective of governments – a voluntary transfer of resources from one country to another.
...
,
education
Education is a purposeful activity directed at achieving certain aims, such as transmitting knowledge or fostering skills and character traits. These aims may include the development of understanding, rationality, kindness, and honesty. ...
and
transportation
Transport (in British English), or transportation (in American English), is the intentional movement of humans, animals, and goods from one location to another. Modes of transport include air, land ( rail and road), water, cable, pipel ...
.
United States discretionary spending
In the United States, discretionary spending refers to optional spending set by appropriation levels each year, at the discretion of Congress.
During the
budget process A budget process refers to the process by which governments create and approve a budget, which is as follows:
* The Financial Service Department prepares worksheets to assist the department head in preparation of department budget estimates
* The A ...
, Congress issues a
budget resolution which includes levels of discretionary spending,
deficit
A deficit is the amount by which a sum falls short of some reference amount.
Economics
* Balance of payments deficit, when the balance of payments is negative
* Government budget deficit
* Deficit spending, the amount by which spending exceeds ...
projections, and instructions for changing
entitlement programs and tax policy.
After setting discretionary spending levels, both the
House Appropriations Committee and
Senate Appropriations Committee divide the agreed-upon amount of discretionary spending into twelve suballocations for each of their twelve subcommittees.
These subcommittees produce twelve annual appropriation bills for the next fiscal year.
While these bills are subject to revision as they move through hearings, markups, Floor consideration, and
conference, the level of discretionary spending remains constrained by the budget resolution.
Eventually, these twelve bills must be approved by the full Appropriations Committee, followed by both Houses of Congress. Once passed, the president either signs them, vetoes them, or allows them to become law by not signing them within ten days.

In 2016, the U.S. federal government spent $1.2 trillion on U.S. discretionary spending. Of this $1.2 trillion, nearly half ($584 billion) was spent on national defense. The rest of U.S. discretionary spending was allocated for education, training, employment, and social services ($92 billion), as well as transportation ($91 billion), veterans' benefits and services ($68 billion), income security ($66 billion), health ($57 billion), administration of justice ($53 billion), international affairs ($52 billion), and other areas related to natural resources, the environment, science, space, and technology ($122 billion).
United States mandatory vs. discretionary spending
In 1962, U.S. discretionary spending made up 47.2% of total U.S. spending, remaining the largest component of federal spending until the mid-1970s.
From this time forward, however, discretionary spending levels as a share of total federal spending has decreased significantly. This is largely due to the rapid growth of entitlement spending, also known as
mandatory spending
The United States federal budget is divided into three categories: mandatory spending, discretionary spending, and interest on debt. Also known as entitlement spending, in US fiscal policy, mandatory spending is government spending on certai ...
.
As more participants become eligible for entitlement programs, mandatory spending automatically increases. This trend is projected to continue in the future. In fact, according to the
Congressional Research Service
The Congressional Research Service (CRS) is a public policy research institute of the United States Congress. Operating within the Library of Congress, it works primarily and directly for members of Congress and their committees and staff on ...
, over the next decade, mandatory spending is projected to reach 14% of GDP, while discretionary spending is projected to continue getting smaller, eventually reaching 5% of GDP.
By 2022, the Congressional Research Service projects that discretionary spending's share of the economy "will be equal to or less than spending in each of the two largest categories of mandatory programs,
Social Security
Welfare, or commonly social welfare, is a type of government support intended to ensure that members of a society can meet basic human needs such as food and shelter. Social security may either be synonymous with welfare, or refer specificall ...
and
Major Health Programs."
See also
*
Budget process A budget process refers to the process by which governments create and approve a budget, which is as follows:
* The Financial Service Department prepares worksheets to assist the department head in preparation of department budget estimates
* The A ...
*
Appropriations bill (United States)
In the United States Congress, an appropriations bill is legislation to appropriate federal funds to specific federal government departments, agencies and programs. The money provides funding for operations, personnel, equipment and activities ...
References
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Government spending