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          that allows the residuary legatee's overpayment to be taken into            
          account in determining petitioner's estate tax deficiency.                  
               As Judge Chabot points out, the Tax Court's task in this               
          case is to redetermine petitioner's estate tax deficiency, and              
          "deficiency" is a term of art in Federal taxation that has                  
          special significance for our jurisdiction.  See Murphree v.                 
          Commissioner, 87 T.C. 1309, 1311 (1986); Martz v. Commissioner,             
          77 T.C. 749, 754 (1981); Hannan v. Commissioner, 52 T.C. 787, 791           
          (1969).  Section 6211(a) defines "deficiency" as follows:                   
               SEC. 6211 DEFINITION OF A DEFICIENCY.                                  
                    (a) In General.-- For purposes of this title in                   
               the case of income, estate, and gift taxes imposed by                  
               subtitles A and B and excise taxes imposed by chapters                 
               41, 42, 43, and 44 the term "deficiency" means the                     
               amount by which the tax imposed by subtitle A or B, or                 
               chapter 41, 42, 43, or 44 exceeds the excess of--                      
                         (1) the sum of                                               
                              (A) the amount shown as the tax by the                  
                         taxpayer upon his return, if a return was                    
                         made by the taxpayer and an amount was shown                 
                         as the tax by the taxpayer thereon, plus                     
                              (B) the amounts previously assessed (or                 
                         collected without assessment) as a                           
                         deficiency, over--                                           
                         (2) the amount of rebates, as defined in                     
                    subsection (b)(2), made.                                          
          In other words, the deficiency (d) equals the correct tax imposed           
          (t) less the total tax shown on the return (s) plus prior                   
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