- 40 -                                         
               Section 6662(a) provides that if any portion of an                     
          underpayment of tax is attributable to any one of the factors               
          listed in section 6662(b), then there shall be added to the tax             
          an amount equal to 20 percent of the amount of the underpayment             
          to which it is so attributable.  Petitioner has the burden of               
          proving that respondent's determination of the penalty is                   
          erroneous.  Rule 142(a); Welch v. Helvering, 290 U.S. at 115.               
               Petitioner did not address the section 6662 penalty issue at           
          trial or on brief.  Therefore, it failed to carry its burden of             
          proof, and we sustain respondent's determination of the penalty             
          for 1990.                                                                   
               To reflect the foregoing,                                              
                                             Decision will be entered                 
                                         under Rule 155.                              
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