Exxon Mobil Corporation and Affiliated Companies, f.k.a. Exxon Corporation and Affiliated Companies - Page 22




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               Accordingly, for the years in issue, the PBU partnership               
          accrued ordinary business expense deductions relating to DRR                
          costs in the years in which the related DRR work was performed.             
               On the PBU partnership Federal income tax returns for the              
          years in issue (1979-82), with respect to estimated future                  
          Prudhoe Bay DRR costs associated with projected DRR work to be              
          performed in subsequent years upon termination of oil production            
          at Prudhoe Bay, no accrual was claimed for an increase to a                 
          capital liability account, for an increase in the depreciable tax           
          basis of capital assets at the Prudhoe Bay field, nor for                   
          ordinary and necessary business expenses.                                   
               During the years in issue, a PBU-sponsored DRR cost study              
          relating to the Prudhoe Bay field was not completed.                        
               On its 1979 and 1980 partnership Federal income tax returns,           
          the PBU elected to compute depreciation on its depreciable assets           
          placed in service in those years under the class life asset                 
          depreciation range (ADR) system of section 1.167(a)-11, Income              
          Tax Regs.  For those same years, PBU elected under section 167(f)           
          to reduce the amount taken into account as salvage value by an              
          amount not exceeding 10 percent of the basis of property                    
          depreciated under the ADR system.  In making this election, the             
          PBU claimed that the gross salvage value did not exceed 10                  
          percent of the unadjusted basis of the facilities.  This election           
          caused the salvage value of each ADR vintage account to be                  
          reduced to zero.  For 1981 and 1982, the PBU depreciated assets             




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