- 29 -                                        
          or without sound basis in fact, Mailman v. Commissioner, supra at           
          1084.                                                                       
               Petitioner did not provide any evidence to show that he had            
          authority for the understatements of income on his 1983 and 1984            
          income tax returns.  Petitioner did not disclose any part of the            
          underpayments for these years.  Petitioner did not provide any              
          evidence that he requested a waiver or that respondent denied any           
          such request.  Even if petitioner had requested a waiver, the               
          lack of evidence in the record indicates that he would not have             
          been able to show reasonable cause for the understatements or               
          that he acted in good faith.  Respondent's determinations of                
          section 6661(a) additions to tax for 1983 and 1984 will be                  
          sustained, subject to recomputation under Rule 155.                         
          Issue 6:  Section 6651(a)--Late Filing                                      
               Section 6651(a) provides for an addition to tax where a                
          taxpayer files a tax return after the due date.  The addition is            
          equal to 5 percent of the underpayment for every month the return           
          is late, with a maximum of 25 percent.  If the Commissioner                 
          determines this addition in the deficiency notice, the taxpayer             
          bears the burden of proving that the return was timely filed, or            
          that his failure to file was due to reasonable cause and not                
          willful neglect.  Rule 142(a); United States v. Boyle, 469 U.S.             
          241, 245 (1985); Wm. J. Lemp Brewing Co. v. Commissioner, 18 T.C.           
          586, 591-592 (1952).                                                        
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