26 C.F.R. § 1.6664-2   Underpayment.


Title 26 - Internal Revenue


Title 26: Internal Revenue
PART 1—INCOME TAXES
ADDITIONS TO THE TAX, ADDITIONAL AMOUNTS, AND ASSESSABLE PENALTIES

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§ 1.6664-2   Underpayment.

(a) Underpayment defined. In the case of income taxes imposed under subtitle A, an underpayment for purposes of section 6662, relating to the accuracy-related penalty, and section 6663, relating to the fraud penalty, means the amount by which any income tax imposed under this subtitle (as defined in paragraph (b) of the section) exceeds the excess of—

(1) The sum of—

(i) The amount shown as the tax by the taxpayer on his return (as defined in paragraph (c) of this section), plus

(ii) Amounts not so shown previously assessed (or collected without assessment) (as defined in paragraph (d) of this section), over

(2) The amount of rebates made (as defined in paragraph (e) of this section).

The definition of underpayment also may be expressed as—

Underpayment=W−(X+Y−Z),

where W=the amount of income tax imposed; X=the amount shown as the tax by the taxpayer on his return; Y=amounts not so shown previously assessed (or collected without assessment); and Z=the amount of rebates made.

(b) Amount of income tax imposed. For purposes of paragraph (a) of this section, the “amount of income tax imposed” is the amount of tax imposed on the taxpayer under subtitle A for the taxable year, determined without regard to—

(1) The credits for tax withheld under sections 31 (relating to tax withheld on wages) and 33 (relating to tax withheld at source on nonresident aliens and foreign corporations);

(2) Payments of tax or estimated tax by the taxpayer;

(3) Any credit resulting from the collection of amounts assessed under section 6851 as the result of a termination assessment, or section 6861 as the result of a jeopardy assessment; and

(4) Any tax that the taxpayer is not required to assess on the return (such as the tax imposed by section 531 on the accumulated taxable income of a corporation).

(c) [Reserved]. For further guidance, see §1.6664–2T.

(d) Amounts not so shown previously assessed (or collected without assessment). For purposes of paragraph (a) of this section, “amounts not so shown previously assessed” means only amounts assessed before the return is filed that were not shown on the return, such as termination assessments under section 6851 and jeopardy assessments under section 6861 made prior to the filing of the return for the taxable year. For purposes of paragraph (a) of this section, the amount “collected without assessment” is the amount by which the total of the credits allowable under section 31 (relating to tax withheld on wages) and section 33 (relating to tax withheld at source on nonresident aliens and foreign corporations), estimated tax payments, and other payments in satisfaction of tax liability made before the return is filed, exceed the tax shown on the return (provided such excess has not been refunded or allowed as a credit to the taxpayer).

(e) Rebates. The term “rebate” means so much of an abatement credit, refund or other repayment, as was made on the ground that the tax imposed was less than the excess of—

(1) The sum of—

(i) The amount shown as the tax by the taxpayer on his return, plus

(ii) Amounts not so shown previously assessed (or collected without assessment), over

(2) Rebates previously made.

(f) Underpayments for certain carryback years not reduced by amount of carrybacks. The amount of an underpayment for a taxable year that is attributable to conduct proscribed by sections 6662 or 6663 is not reduced on account of a carryback of a loss, deduction or credit to that year. Such conduct includes negligence or disregard of rules or regulations; a substantial understatement of income tax; and a substantial (or gross) valuation misstatement under chapter 1, provided that the applicable dollar limitation is satisfied for the carryback year.

(g) Examples. The following examples illustrate this section:

Example 1.  Taxpayer's 1990 return showed a tax liability of $18,000. Taxpayer had no amounts previously assessed (or collected without assessment) and received no rebates of tax. Taxpayer claimed a credit in the amount of $23,000 for income tax withheld under section 3402, which resulted in a refund received of $5,000. It is later determined that the taxpayer should have reported additional income and that the correct tax for the taxable year is $25,500. There is an underpayment of $7,500, determined as follows:

   Tax imposed under subtitle A....................  ..........     $25,500Tax shown on return.............................     $18,000  ..........Tax previously assessed (or collected without           None  .......... assessment)....................................Amount of rebates made..........................        None  ..........                                                 -----------------------Balance.........................................  ..........     $18,000                                                 -----------------------      Underpayment..............................  ..........      $7,500 

Example 2.  The facts are the same as in Example 1 except that the taxpayer failed to claim on the return a credit of $1,500 for income tax withheld. This $1,500 constitutes an amount collected without assessment as defined in paragraph (d) of this section. The underpayment is $6,000, determined as follows:

   Tax imposed under subtitle A....................  ..........     $25,500Tax shown on return.............................     $18,000  ..........Tax previously assessed (or collected without          1,500  .......... assessment)....................................Amount of rebates made..........................        None  ..........                                                 -----------------------Balance.........................................  ..........     $19,500                                                 -----------------------      Underpayment..............................  ..........      $6,000 

Example 3.  On Form 1040 filed for tax year 1990, taxpayer reported a tax liability of $10,000, estimated tax payments of $15,000, and received a refund of $5,000. Estimated tax payments actually made with respect to tax year 1990 were only $7,000. For purposes of determining the amount of underpayment subject to a penalty under section 6662 or section 6663, the tax shown on the return is $2,000 (reported tax liability of $10,000 reduced by the overstated estimated tax of $8,000 ($15,000–$7,000)). The underpayment is $8,000, determined as follows:

   Tax imposed under subtitle A....................  ..........     $10,000Tax shown on return.............................      $2,000  ..........Tax previously assessed (or collected without           None  .......... assessment)....................................Amount of rebates made..........................        None  ..........                                                 -----------------------Balance.........................................  ..........      $2,000                                                 -----------------------      Underpayment..............................  ..........      $8,000 

[T.D. 8381, 56 FR 67506, Dec. 31, 1991; T.D. 8381, 57 FR 6165, Feb. 20, 1992, as amended by T.D. 9186, 70 FR 10039, Mar. 2, 2005]

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