- 6 - reckless, or intentional disregard.” Id. Under caselaw, “‘Negligence is a lack of due care or the failure to do what a reasonable and ordinarily prudent person would do under the circumstances.’” Freytag v. Commissioner, 89 T.C. 849, 887 (1987) (quoting Marcello v. Commissioner, 380 F.2d 499, 506 (5th Cir. 1967), affg. on this issue 43 T.C. 168 (1964) and T.C. Memo. 1964-2990), affd. 904 F.2d 1011 (5th Cir. 1990), affd. 501 U.S. 868 (1991). There is a “substantial understatement” of income tax for any taxable year where the amount of the understatement exceeds the greater of (1) 10 percent of the tax required to be shown on the return for the taxable year or (2) $5,000. Sec. 6662(d)(1)(A)(i) and (ii). However, the amount of the understatement is reduced to the extent attributable to an item (1) for which there is or was substantial authority for the taxpayer’s treatment thereof, or (2) with respect to which the relevant facts were adequately disclosed on the taxpayer’s return or an attached statement and there is a reasonable basis for the taxpayer’s treatment of the item. See sec. 6662(d)(2)(B). There is an exception to the section 6662(a) penalty when a taxpayer can demonstrate (1) reasonable cause for the underpayment and (2) that the taxpayer acted in good faith with respect to the underpayment. Sec. 6664(c)(1). Regulations promulgated under section 6664(c) further provide that thePage: Previous 1 2 3 4 5 6 7 8 9 10 11 NextLast modified: November 10, 2007