Reader Morris pointed out that I had written, “The American Rescue Plan Act of 2021 amended Internal Revenue Code section 85 to provide that the first $10,200 of unemployment compensation is excluded from federal gross income if the taxpayer’s adjusted gross income is less than $150,000.” He directed my attention to a revised IRS instruction and explanation publication that begins, “If your modified adjusted gross income (AGI) is less than $150,000, the American Rescue Plan enacted on March 11, 2021, excludes from income up to $10,200 of unemployment compensation paid in 2020, . . .” His implicit question was why the difference between the phrase I used, “adjusted gross income,” and the phrase the IRS used, “modified adjusted gross income.”
In my reply to reader Morris, I first shared the text of the amendment to section 85 made by section 9042 of the American Rescue Plan Act of 2021:
SEC. 9042. SUSPENSION OF TAX ON PORTION OF UNEMPLOYMENT COMPENSATION.I noted to reader Morris that the statute does not use the term “modified adjusted gross income.” Instead, it defines adjusted gross income by reference to certain other Internal Revenue Code sections. I invited reader Morris to compare section 86, which deals with taxation of social security benefits:
(a) In General.—Section 85 of the Internal Revenue Code of 1986 is amended by adding at the end the following new subsection:
“(c) Special Rule For 2020.—
“(1) IN GENERAL.—In the case of any taxable year beginning in 2020, if the adjusted gross income of the taxpayer for such taxable year is less than $150,000, the gross income of such taxpayer shall not include so much of the unemployment compensation received by such taxpayer (or, in the case of a joint return, received by each spouse) as does not exceed $10,200.
“(2) APPLICATION.—For purposes of paragraph (1), the adjusted gross income of the taxpayer shall be determined—
“(A) after application of sections 86, 135, 137, 219, 221, 222, and 469, and
“(B) without regard to this section.”.
SEC. 86. Social security and tier 1 railroad retirement benefitsProbably thinking it would simplify things, the IRS decided to “rewrite” the statute by using the term “modified adjusted gross income” to describe the result of using the different definition for adjusted gross income provided in section 85(c)(2). Though this “rewrite” or this different way of describing the computation rules might be an improvement, It also poses a danger. Someone looking at the term “modified adjusted gross income” might think that the term refers to one computational concept, when in fact that is not the case. A close look at the definition of the term in section 86 and the definition of recomputed adjusted gross income in section 85 reveals differences.
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(b) Taxpayers to whom subsection (a) applies
(1) In general. A taxpayer is described in this subsection if—
(A) the sum of—
(i) the modified adjusted gross income of the taxpayer for the taxable year, plus
(ii) one-half of the social security benefits received during the taxable year, exceeds
(B) the base amount.
(2) Modified adjusted gross income. For purposes of this subsection, the term “modified adjusted gross income” means adjusted gross income—
(A) determined without regard to this section and sections 135, 137, 221, 222, 911, 931, and 933, and
(B) increased by the amount of interest received or accrued by the taxpayer during the taxable year which is exempt from tax.
Does it need to be this complicated? Not necessarily. The reason that there is a need for recomputing or modifying adjusted gross income is to get a measurement of a taxpayer’s income that is closer to economic income than is adjusted gross income. Adjusted gross income reflects a long list of exclusions, so that a taxpayer with substantial economic income might have an adjusted gross income that is much lower. Because Congress uses adjusted gross income as a benchmark to determine whether a taxpayer’s economic situation is “low enough” to warrant access to gross income exclusions intended to assist those with “low income,” it can bring within the exclusion taxpayers with high economic income. To block those taxpayers from taking advantage of the exclusion, Congress creates another benchmark.
The complexity could be reduced by eliminating many of the exclusions, particularly those subject to some sort of adjusted gross income limit, and in turn lowering tax rates for taxpayers with lower incomes. Not only would that reduce complexity by removing the words and efforts required to determine if an exclusion applies, it would also simplify the need to play with adjusted gross income definitions because there would be fewer exclusions requiring a redefined adjusted gross income and fewer adjustments needed to reflect exclusions in the process of redefining adjusted gross income for purposes of computing the exclusion.