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Historical Effective Federal Tax Rates: 1979-2002 1 (March 2005)

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               Historical Effective Federal Tax Rates:
                                1979 to 2002

                                   March 2005


  The following tables update the series of historical effective lax rates estimated by
  the Congressional Budget Office (C3O) by providing values for an additional
  year--2002.' The tables show effective tax rates for the four largest sources of'
  federal revenues--individual income taxes, corporate income taxes, payroll taxes,
  and excise taxes--as well as the total effective rate For the four taxes combined.
  The tables also present average pretax and after-tax household income; counts of'
  households; and shares of taxes, income, and households for each fifth (quintile)
  of the income distribution and for the top percentiles ol'houscholds.


  Tax Law Changes in 2002
  Cornpared to those in 2001, effective tax rates in 2002 were affected by two major
  tax bills. The provisions of the Economic Growth and Tax Relief* Reconciliation
  Act of 2001 (EGTRRA) continued to phase in, lowering the effective individual
  income tax rate. In 2002, EGTRRA reduced the statutory tax rates for the top four
  brackets below their 2001 levels, increased the income range over which married
  couples could claim the earned income tax credit, and allowed for higher tax
  credits to offset child and dependent care expenses. '[he Job Creation and Worker
  Assistance Act of 2002 (JCWAA) lowered effective rates for both the individual
  income and corporate income taxes by increasing depreciation allowances for
  some property and altering tax rules concerning operating losses.'


  Effective Tax Rates in 2002
  The overall effective tax rate fell by 0.7 percentage points, firom 21,4 percent in
  2001 to 20.7 percent in 2002, largely because of a 0.7 percentage point drop in the
effective individual income tax rate. Tihe effective corporate income tax rate fbll
by 0.3 percentage points, while the effective social insurance tax rate rose by an
equivalent amount.

A combination of tax law changes and income changes accounted for the drop in
effective individual tax rate. EGTRJ(A lowered rates and increased credits, while

I.     See .ongreaional Budget Office, Effective Federal Twt Rates 1997 to 2000 (August 2003), An
       update extended the sries to 2001; see Effective Federal Tax Rates: 1979-2001 (April 2104),
       available at wvw,cb.gov.
2.     For a mare detailed deseription of legislative chung.es to the tax law, wc Congressional Budget
       Office. Effective Federal Ttix Rates Under Current Lwa 2001 to 2014 (August 2004).

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