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any property claimed on the return is 25 percent or less of the
amount determined to be the correct value. See sec. 6662(h).
Section 6664 provides an exception to the imposition of
accuracy-related penalties if the taxpayer shows that there was
reasonable cause for the understatement and that the taxpayer
acted in good faith. See sec. 6664(c); see also United States v.
Boyle, 469 U.S. 241, 242 (1985). Whether a taxpayer acted with
reasonable cause and in good faith is a factual question. See
sec. 1.6664-4(b), Income Tax Regs. Generally, the most important
factor is the extent to which the taxpayer exercised ordinary
business care and prudence in attempting to assess his or her
proper tax liability. See Estate of Simplot v. Commissioner, 112
T.C. 130, 183 (1999) (citing Mandelbaum v. Commissioner, T.C.
Memo. 1995-255), revd. on another issue 249 F.3d 1191 (9th Cir.
2001); sec. 1.6664-4(b), Income Tax Regs.
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