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          equal to 20 percent of the portion of the underpayment to which             
          section 6662 applies.  Section 6662(b)(1) provides that section             
          6662 shall apply to the portion of any underpayment attributable            
          to negligence or disregard of rules or regulations.  Section                
          6662� provides that the term "negligence" includes any failure to           
          make a reasonable attempt to comply with the provisions of this             
          title, and the term "disregard" includes any careless, reckless,            
          or intentional disregard of rules or regulations.  Negligence is            
          the lack of due care or failure to do what a reasonable and                 
          ordinarily prudent person would do under the circumstances.                 
          Neely v. Commissioner, 85 T.C. 934, 947 (1985).                             
               However, under section 6664(c), no penalty shall be imposed            
          under section 6662(a) with respect to any portion of any                    
          underpayment if it is shown that there was a reasonable cause for           
          such portion and that the taxpayer acted in good faith with                 
          respect to such portion.  The Commissioner's determination is               
          presumptively correct and will be upheld unless the taxpayer is             
          able to rebut the presumption.  Luman v. Commissioner, 79 T.C.              
          846, 860-861 (1982); Bixby v. Commissioner, 58 T.C. 757, 791                
          (1972); Reily v. Commissioner, 53 T.C. 8, 13-14 (1969).                     
               In the notices of deficiency issued to the corporation,                
          William R. Norwalk, and Robert and Patricia DeMarta, respondent             
          applied the section 6662(a) penalty to "all or part of the                  
          underpayment of tax".  With regard to the $23,320 adjustment                
          conceded by petitioners Robert and Patricia DeMarta, they have              
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