- 31 -                                         
          Mich. v. Commissioner, 353 U.S. 180, 189-190 (1957); Brown v.               
          Helvering, 291 U.S. 193, 203 (1934).  Taxpayers challenging the             
          Commissioner's authority must prove that the Commissioner's                 
          determination is "clearly unlawful" or "plainly arbitrary".                 
          Thor Power Tool Co. v. Commissioner, supra at 532-533.  The                 
          Commissioner's authority under section 446(b) encompasses overall           
          methods of accounting, as well as specific methods utilized to              
          report any item of income or expense.  Id. at 531; Ford Motor Co.           
          v. Commissioner, 102 T.C. at 100; Prabel v. Commissioner, 91 T.C.           
          1101, 1112-1113 (1988), affd. 882 F.2d 820 (3d Cir. 1989); sec.             
          1.446-1(a), Income Tax Regs.                                                
                The fact that the Commissioner possesses broad authority              
          under section 446(b) does not mean that the Commissioner can                
          change a taxpayer's method of accounting with impunity.  See,               
          e.g., Prabel v. Commissioner, supra at 1112-1113.  Thus, for                
          example, if a taxpayer uses a method of accounting that clearly             
          reflects income, the Commissioner may not require a change to               
          another method merely because the Commissioner believes that the            
          latter method will reflect income more clearly.  Ansley-Sheppard-           
          Burgess Co. v. Commissioner, 104 T.C. 367 (1995); Auburn Packing            
          Co. v. Commissioner, 60 T.C. 794 (1973); Garth v. Commissioner,             
          56 T.C. 610 (1971); see also St. James Sugar Co-op, Inc. v.                 
          United States, 643 F.2d 1219 (5th Cir. 1981); Photo-Sonics, Inc.            
          v. Commissioner, 357 F.2d 656, 658 (9th Cir. 1966), affg. 42 T.C.           
          926 (1964); Bay State Gas Co. v. Commissioner, 75 T.C. 410, 417             
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