Exxon Corporation - Page 18




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               Based on industry data that is in evidence and that was                
          gathered from Exxon and approximately 33 other oil companies                
          involved in North Sea oil and gas production, the cumulative                
          total uplift allowed the companies for 1975 through 1988 was                
          �12.4 billion, as compared to cumulative total interest expense             
          not allowed the companies under PRT of �8.6 billion.  In the                
          Appendix to this Opinion, for 1975 through 1988, we set forth the           
          amount of uplift and other deductions allowed to Exxon and to the           
          other oil and gas companies and the amount of ring fence interest           
          expense not allowed to Exxon and the other oil and gas companies            
          in the computation of PRT liability.                                        
               As a result of the special allowances such as oil, tariff              
          receipts, safeguard, and uplift, PRT represents and constitutes a           
          tax on a subset of net income subject to the Ring Fence Tax.                
               Through 1992, Exxon had interests in 23 oil-producing North            
          Sea fields, but significant PRT was paid only with regard to five           
          of the fields (Brent, Forties, Dunlin, Fulmar, and North                    
          Cormorant).  More than 60 percent of total PRT paid by Exxon                
          through 1992 was paid with respect to only one field -- the Brent           
          field which was the highest oil-producing field in the North Sea.           
               Generally for the industry, the bulk of PRT was paid with              
          respect to a limited number of the largest and most profitable              
          fields.  More specifically, through 1988, approximately 75                  
          percent of total cumulative PRT collected by the United Kingdom             






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