- 23 -                                         
               For example, in Rev. Rul. 66-317, 1966-2 C.B. 510, the                 
          taxpayer claimed an ITC in year 1.  In year 4, an NOL arose which           
          was carried back to year 1, eliminating taxable income and tax              
          liability for year 1, and thereby displacing the ITC originally             
          claimed.  The ruling holds that the taxpayer was not required to            
          pay interest from year 1 to year 4 on that portion of the tax               
          that had been originally offset by the ITC that was displaced by            
          the NOL.                                                                    
               In Rev. Rul. 71-534, 1971-2 C.B. 414, the taxpayer incurred            
          an NOL for year 6, which was carried back to year 3, eliminating            
          taxable income against which an FTC had been claimed in year 3.             
          As a result, the FTC was carried back to year 1, for which year a           
          refund was claimed.  The ruling holds that interest was due to              
          the taxpayer on the refund from the first day after the close of            
          year 6, because the significant event that gave rise to the year            
          1 overpayment was the year 6 NOL.16                                         
               In Rev. Rul. 82-172, 1982-2 C.B. 397, the taxpayer had an              
          unused ITC in year 3 that it carried back to year 1.  In year 4,            
          the taxpayer incurred an NOL which it carried back to year 1,               
          eliminating all income and resultant tax liability against which            
          the ITC could be applied, and resulting in a refund for year 1.             
          The displaced ITC was carried to year 2, resulting in an                    
          overpayment of tax for year 2.  The ruling holds that the                   
          16  See infra note 18.                                                      
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