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Above-the-line deduction
Above the line deductions are also known as "adjustments to income" and are shown on lines 23-36 of Form 1040.
In the United States tax law, an above-the-line deduction is a deduction that the Internal Revenue Service allows a taxpayer to subtract from his or her gross income in arriving at "adjusted gross income" for the taxable year. These deductions are set forth in Internal Revenue Code Section 62. A taxpayer's gross income minus his or her above-the-line deductions is equal to the adjusted gross income. Because these deductions are taken before adjusted gross income is calculated, they are designated "above-the-line." Thus, those deductions allowed in computing "taxable income" under section 63 of the IRC are "below the line deductions" (thus, adjusted gross income represents "the line"). Above-the-line deductions may be more valuable to high income taxpayers than below-the-line deductions.
==Impact==
Above-the-line deductions are generally more advantageous for a high income taxpayer than so-called below-the-line deductions. Below the line deductions are subtracted from a taxpayer's adjusted gross income. Above-the-line deductions may also be subject to income-sensitive phaseouts or limitations, e.g., MAGI limits on Tuition and Fees deduction on line 34. Certain below the line deductions are also phased out for high income taxpayers pursuant to Internal Revenue Code Section 68. Medical and dental expenses are below the line deductions pursuant to Internal Revenue Code Section 67. These expenses may only be deducted, however, to the extent they exceed 10% (7.5 % for 65 and over ) of a taxpayer's AGI. (〔http://www.law.cornell.edu/uscode/text/26/213〕 Accordingly, if a taxpayer had an adjusted gross income of $100,000 and medical expenses of $11,000, he or she would only be entitled to deduct the amount by which these expenses exceed 10% of $100,000, or $10,000. Because these expenses exceed $10,000 by $1,000, the taxpayer is only entitled to a $1,000 deduction.
Above-the-line deductions are also preferred because they can be taken by ALL taxpayers regardless of whether they take standard or itemized deductions (see attached tax ladder). Moreover, they are desirable because they reduce adjusted gross income (AGI). Generally, the smaller the AGI, the greater the percentage of deductibility of itemized deductions.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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