- 96 - Year Amount 1985 $1,287 1986 957 1987 1,385 1988 2,195 1989 2,796 1990 3,129 The increase in taxable Social Security income resulted from the adjustments respondent made to Frank and Katherine’s income for those years. Section 86(a) provides that gross income includes a portion of Social Security benefits received by individuals whose (1) modified adjusted gross income increased by one-half of the Social Security benefits received during the years (readjusted modified adjusted gross income) exceeds (2) the base amount. See sec. 86(a) and (b)(1). Modified adjusted gross income is adjusted gross income without regard to Social Security benefits and other adjustments not pertinent to these cases. See sec. 86(b)(2). The base amount for a joint return is $32,000. See sec. 86(c). For the years in issue, the portion of Social Security benefits included in gross income equals the lesser of one-half of the Social Security benefit received or one-half of the excess of the taxpayer’s readjusted modified adjusted gross income over the base amount. See sec. 86(a)(1). Petitioners contend that respondent’s determination was made on the erroneous assumption that Frank and Katherine underreported their income for the years in issue; therefore, noPage: Previous 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 Next
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