The following excerpt is from Rakosi v. C.I.R., 46 F.3d 1144 (9th Cir. 1995):
Section 6651(a)(1) of the Tax Code imposes further penalties on a taxpayer when "any part of an underpayment of tax ... is due to negligence (or disregard of rules or regulations) ...." Negligence is here defined as a "lack of due care or failure to do what a reasonable and prudent person would do under similar circumstances." Allen v. C.I.R., 925 F.2d 348, 353 (9th Cir. 1991).
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