- 106 -                                         
          fraudulent transactions under section 6621(c)(3)(A)(v).                      
          Respondent notes that transactions constituting either shams in              
          fact or shams in substance are shams for purposes of section                 
          6621(c)(3)(A)(v).  Cherin v. Commissioner, 89 T.C. 986, 1000-1001            
          (1987); see Thomas v. United States, 166 F.3d 825, 834 (6th Cir.             
          1999) (holding that once a transaction is found to be a sham,                
          section 6621(c) interest is imposed regardless of a taxpayer’s               
          investment motive); Anderson v. Commissioner, 62 F.3d 1266, 1274             
          (10th Cir. 1995) (same), affg. T.C. Memo. 1993-607.                          
          B.   Section 6621(c)                                                         
               Section 6621(c)21 (formerly section 6621(d)) provides for an            
          increased rate of interest with respect to “any substantial                  
          underpayment” of tax in any taxable year “attributable to 1 or               
          more tax motivated transactions” if the amount of the                        
          underpayment for such year so attributable exceeds $1,000.                   
          Section 6621(c)(3)(A) generally lists the types of transactions              
          which are considered “tax motivated transactions”.  A tax                    
          motivated transaction includes any valuation overstatement within            
          the meaning of section 6659(c), and such a valuation                         
          overstatement exists, among other situations, if the adjusted                
          basis of property claimed on any return exceeds 150 percent of               
               21  The Omnibus Budget Reconciliation Act of 1989 (OBRA                 
          1989), sec. 7721(b), 103 Stat. 2106, 2399, repealed sec. 6621(c).            
          This repeal was effective for returns the due date for which                 
          (determined without extensions) is after Dec. 31, 1989.  See OBRA            
          1989 sec. 7721(c), 103 Stat. 2400, Pub. L. 101-239.                          
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