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1 Legislation Enacted in the 115th Congress That Affects Mandatory Spending or Revenues 1 (March 2019)

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                                                                                              MARCH 2019






     Legislation Enacted in the 115th Congress

That Affects Mandatory Spending or Revenues


This report of the Congressional Budget Office sum-
marizes the agency's estimates of the budgetary effects
of authorizing legislation enacted during the first and
second sessions of the 115th Congress (calendar years
2017  and 2018) that affected mandatory spending or
revenues.) The estimates incorporated into this report are
for the enacted versions of the corresponding laws. Each
estimate was prepared when the legislation was consid-
ered or enacted, and each was measured over the period
of time and against the baseline projections used for
budget enforcement  purposes by the House and  Senate
Committees  on  the Budget at the time the legislation was



1. In addition to the budgetary effects of authorizing legislation, the
   amounts in this report and the accompanying tables include
   the estimated effects on revenues from provisions included
   in enacted appropriation legislation. The estimated effects on
   budget authority and outlays of appropriation legislation are not
   included in this report because most of those effects are classified
   in the budget as discretionary spending. Although annual
   appropriation legislation typically provides a large amount of
   mandatory spending authority each year (estimated at more than
   $1 trillion in fiscal year 2017 and again in 2018), most of those
   amounts are already included in CBO's baseline projections, as
   required by section 257 of the Balanced Budget and Emergency
   Deficit Control Act of 1985. Accordingly, relative to CBO's
   baselines, most mandatory spending ascribed to appropriation
   legislation has no budgetary effect.


last considered by the Congress.2 The periods referred to
are consistent with those that CBO used for its cost esti-
mates during each Congressional session. The cumulative
effects of the legislation are presented in Table 1.

According  to CBO's estimates, the laws that were
enacted during the first session of the 115th Congress
will increase budget deficits in every fiscal year from
2017  through 2026  but will decrease the deficit in
2027. In total, CBO  estimated, those laws will add
about $1.5 trillion to the cumulative deficit over the
2017-2027   period. The largest estimated increase in the
deficit stems from Public Law 115-97, the major tax
legislation enacted in December 2017, which  amended
numerous  provisions of U.S. tax law and reduced most
income  tax rates for individuals and corporations. At the
time that P.L. 115-97 (H.R. 1) was considered by the
Congress, CBO   and the staff of the Joint Committee
on Taxation (JCT)  estimated that its enactment would
increase the deficit in every fiscal year from 2017 through
2026  before decreasing it in 2027. In total, CBO and
JCT  estimated, P.L. 115-97 would decrease revenues
by about $1,649  billion and would decrease outlays by

2.  For more information related to the budgetary effects identified
    in CBO's estimates, see Congressional Budget Office, How
    CBO Prepares Cost Estimates (February 2018), www.cbo.gov/
    publication/535 19.


Notes: Unless otherwise indicated, all years referred to are federal fiscal years, which run from October 1 to September 30 and are
designated by the calendar year in which they end. Numbers in the text and table may not sum to totals because of rounding.

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