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Role of the 25 Percent Revenue Offset in Estimating the Budgetary Effects of Legislation 1 (January 2009)

handle is hein.congrec/cbo8355 and id is 1 raw text is: A series of issuze summaries from
the Congressional Budget Office
JANUARY 13, 2009

The Role of the 25 Percent Revenue Offset in
Estimating the Budgetary Effects of Legislation

When excise taxes, customs duties, and other types of
indirect taxes are imposed on goods and services, they
tend to reduce income for workers or business owners in
the taxed industry and for others throughout the econ-
omy. Consequently, revenue derived from existing
direct tax sources-such as individual and corporate
income taxes and payroll taxes-will also be reduced. To
approximate that effect, the Congressional Budget Office
(CBO), the Joint Committee on Taxation (JCT), and the
Treasury Department's Office of Tax Analysis (OTA)
apply a 25 percent offset when estimating the net revenue
that legislation imposing some form of indirect tax is
expected to generate. In other words, the estimated pro-
ceeds from the indirect tax are reduced by 25 percent to
account for the resulting reductions in income and pay-
roll taxes. The offset is made in addition to accounting
for behavioral responses to the new tax.
Although applying the 25 percent offset for budget esti-
mates is a longstanding convention, proposals to address
global climate change have created greater public aware-
ness of that practice. Because tradable emission permits
would have economic effects that are identical to those of
a tax on emissions, which would be an indirect tax, CBO
applies the offset when calculating the revenue that such
policies might generate. For example, if the issuance of
emission permits was estimated to generate $100 billion
in revenues in a given year, the estimate would also reflect
an offsetting reduction of $25 billion in income and pay-
roll taxes, for a net revenue gain of $75 billion. This brief
explains that estimating convention-its rationale, appli-
cation, and implications for policy decisions.

Why an Offset Is Needed
More than 90 percent of federal revenue comes from
income and payroll taxes-what economists generally
refer to as direct taxes. Much of the remainder is gener-
ated by excise taxes, tariffs, and a variety of governmental
fees and assessments that are all thought of as indirect
forms of taxation.1
The distinction stems from the way in which total
income and total production are measured in the econ-
omy. In the absence of taxes, all that is spent on goods
and services in the economy becomes income for those
who produce, or supply the means to produce, those
goods and services. Proceeds from that spending are used
to provide compensation-in the form of wages, profits,
rent, and interest-to those who supply the labor,
machines, buildings, and other inputs that are needed to
produce those goods and services. Taxes imposed on that
compensation are considered direct. Taxes imposed at an
intermediate stage of production and sale are indirect.
Because the prices of goods and services must reflect all
the costs of production, imposing an indirect tax would
divert some of the proceeds from spending on those
goods and services that otherwise would be available for
compensation to those firms or individuals that provide
the productive inputs.
1. That classification is in contrast to the way that direct and indirect
taxes are distinguished under law. Under the legal definition, indi-
rect taxes are imposed on an action or event, such as importing,
manufacturing, buying a good, paying for a service, or transferring
an asset. Direct taxes are imposed on objects, such as property or
wealth. Under that classification scheme, income and payroll taxes
are also considered indirect taxes.

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