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CBO's Revenue Forecasting Record 1 (November 2015)

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                                                                              NOVEMBER  2015






           CBO's Revenue Forecasting Record

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Summary
To prepare the baseline budget projections on which much of its analysis is based, the
Congressional  Budget Office must regularly produce revenue forecasts. As a part of that
process, the agency assesses the accuracy of its past projections and continually refines
its methods for projecting revenues to attempt to make them more accurate. This report
examines  the accuracy of CBO's revenue  projections since 1982, the earliest year for
which the information necessary to assess the forecasts is available. On average, the
agency's projections have been a bit too high-more  so for projections spanning six
years than for those spanning two-owing  mostly to the difficulty of predicting when
economic  downturns  will occur. The overall accuracy of CBO's revenue projections has
been  similar to that of the projections of other government agencies.

How  Accurate Have  CBO's Two-Year  Revenue  Projections Been?
On  average, CBO   has overestimated  total revenues by 1 .1 percent in its two-year
projections-those  that provide estimates of revenues for the fiscal year following
the year in which they are released. A misestimate of that size in its January 2015
baseline projection, for example, would amount  to $37 billion out of the roughly
$3.5  trillion in total revenues that CBO projected for fiscal year 2016.1 Overestimates

1.  See Congressional Budget Office, The Budget and Economic Outlook: 2015 to 2025 (January
    2015), www.cbo.gov/publication/49892.


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 tables may not add up to totals because of rounding.
Some figures have vertical bars that indicate the duration of recessions. (A recession extends from the
peak of a business cycle to its trough.)The historical data on revenues and gross domestic product used
in this report are based on information available as of January 2015. Incorporating more recent data
into this analysis would have only a very minor effect on the results.
Supplemental data for this analysis are posted along with this report on CBO's website (www.cbo.gov/
publication/50831).


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