Includes the Alaskan permanent fund, reported by residents of Alaska on Forms 1040A and 1040EZ's. This fund only applies to statistics in the U.S. totals, and the state of Alaska.
 "Itemized deductions" include any amounts reported by the taxpayer, even if they could not be used in computing "taxable income," the base on which the regular income tax was computed. Thus, total itemized deductions include amounts that did not have to be reported by taxpayers with no "adjusted gross income." (Adjusted gross income is the total from which these deductions would normally be subtracted.) In addition, if standard and itemized deductions were both reported on a tax return, the form of deduction actually used in computing income tax was the one used for the statistics. Therefore, if the standard deduction was the form of deduction used, the total reported for itemized deductions was excluded from the statistics. However, the component deductions were not similarly excluded. As a result, the number of returns and related amounts for the component deductions are slightly overstated in relation to the grand total shown for itemized deductions. These components are also overstated in relation to the total because there was a statutory limitation on the total of itemized deductions that could be claimed by certain high-income taxpayers. This limitation did not affect the component deductions, the sum of which therefore exceeded the total used in computing income tax.
 "Total tax credits" excludes the "earned income credit" which is shown separately.
 "Earned income credit" includes both the refundable and non-refundable portions. The non-refundable portion could reduce income tax and certain related taxes to zero. The earned income credit amounts in excess of total tax liability, or amounts when there was no tax liability at all, were refundable. See footnote 7 below for explanation of the refundable portion of the earned income credit.
 The refundable portion of the "earned income credit" equals "total income tax" minus the "earned income credit". If the result is negative, this amount is considered the refundable portion.
 "Income tax" is in general, the same as "income tax after credits" which was redefined in Tax Year 2000 to include the "alternative minimum tax (AMT)". Zip Code table "Income tax" differs from "total income tax" (in other tables) in that the Zip Code table "Income tax" is after the subtraction of all tax credits except the earned income credit. See footnote 6 and 7 above, for an explanation of the treatment of the earned income credit. "Income tax" reflects the amount reported on the tax return and is, therefore, before any examination or enforcement activities by the Internal Revenue Service. It represents the tax filer reported income tax liability that was payable to the U.S. Department of the Treasury.
 For the Zip Code tables, "Total tax liability" differs from "Income tax," in that "Total tax liability" includes the taxes from recapture of certain prior-year credits, tax applicable to individual retirement arrangements (IRA's), Social Security taxes on self-employment income and on certain tip income, advanced earned income payments, household employment taxes, and certain "other taxes" listed in the Form 1040 instructions.
 Reflects payments to or withholdings made to "Total tax liability" (footnote 9). The amount the tax filer owes when the income tax return is filed.
 The amount of overpayments the tax filer requested to have refunded.
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