If the adjudicator believes there is reason to question the reported SEI, proceed
            as follows:
         
         
            - 
               
                  • 
                     Obtain and review at least one Schedule C or F (Form 1065 in partnership cases) and
                        Schedule SE.
                      
 
 
- 
               
                  • 
                     Correct the Master Earnings File (MEF) if appropriate. 
 
 
- 
               
                  • 
                     Question earlier years open to correction and correct the MEF for such years if development
                        results in:
                      
 
 
A finding that the return was not bona fide; or
         A determination that the correct NE was less than $400; or
         A change of more than 10 percent in the reported NE.
         
            - 
               
                  • 
                     If the claimant does not have the required evidence in his or her possession, contact
                        the IRS, see RS 01804.400 for instructions on how to contact the IRS.