SECTION 3. BACKGROUND

.01 If section 6662 applies to any portion of an underpayment of tax required to be shown on a return, an amount equal to 20 percent of the portion of the underpayment is added to the tax. Under section 6662(b)(2), the penalty applies to the portion of any underpayment of tax that is attributable to a substantial understatement of income tax. The penalty rate increases to 40 percent in the case of gross valuation misstatements under section 6662(h), nondisclosed noneconomic substance transactions under section 6662(i), or undisclosed foreign financial asset understatements under section 6662(j). .02 Generally, there is a substantial understatement of income tax if the amount of the understatement exceeds the greater of (i) 10 percent of the amount of tax required to be shown on the return for the taxable year or (ii) $5,000. Section 6662(d)(1). Section 6662(d)(1)(C) provides a special rule for taxpayers claiming a section 199A deduction. In the case of any taxpayer who claims any deduction allowed under section 199A for the taxable year, there is a substantial understatement of income tax if the amount of the understatement exceeds the greater of (i) 5 percent of the amount of tax required to be shown on the return for the taxable year or (ii) $5,000. Section 6662(d)(1)(B) provides a special rule for corporations. A corporation (other than an S corporation or a personal holding company) has a substantial understatement of income tax if the amount of the understatement exceeds the lesser of (i) 10 percent of the tax required to be shown on the return for a taxable year (or, if greater, $10,000) or (ii) $10,000,000. Generally, an understatement is the excess of the amount of tax required to be shown on the return for the taxable year over the amount of the tax that is shown on the return reduced by any rebate, where the excess is determined without regard to items to

December 28, 2020 1806 Bulletin No. 2020–53

.06 This revenue procedure may apply to a return for a fiscal tax year that begins in 2020 and ends in 2021. This revenue procedure may also apply to a short year return for a period beginning in 2021 if the return is to be filed before the 2021 forms are available. (Note that individuals are generally not put in this position. The most frequent situation in which a short year arises is when filing a decedent’s final return for a fractional part of a year. In that situation, the 2021 form will be available because the final return is due the fifteenth day of the fourth month following the close of the 12-month period that began with the first day of such fractional part of the year (meaning the due date is not accelerated). See Treas. Reg. § 1.6072-1(b). In the case of fiscal year and short year returns, the taxpayer must take into account any tax law changes that are effective for tax years beginning after December 31, 2020, even though these changes are not reflected on the form or instructions.

.07 This document does not take into account the effect of tax law changes effective for tax years beginning after December 31, 2020. If a line referenced in this revenue procedure is affected by such a change and requires additional reporting, a taxpayer may have to file Form 8275, Disclosure Statement, or Form 8275-R, Regulation Disclosure Statement, until the Service prescribes criteria for complying with the requirement.

.08 A complete and accurate disclosure of a tax position on the appropriate year’s Schedule UTP, Uncertain Tax Position Statement, will be treated as if the corporation filed a Form 8275 or Form 8275-R regarding the tax position. The filing of a Form 8275 or Form 8275-R, however, will not be treated as if the corporation filed a Schedule UTP.