Individual income tax return statistics by selected descending and ascending cumulative percentiles for Tax Years 2001 to 2010 are now available from the IRS.
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These tables show historical statistics from 2001 through 2010 on income and tax by cumulative percentiles based on numbers of returns. The tables show distributions of adjusted gross income and total income tax by descending and ascending cumulative percentiles of returns in both current and constant dollars. They can be used to make comparisons across cumulative percentile classes beginning with Tax Year 2001.
All individual income tax returns except returns of dependents are now used in the computation, whereas previous releases were based on only returns with positive AGI.