(a) 
         The sum of pay for nonovertime hours that are part of a firefighter's regular tour of duty (as computed under  § 550.1303) and the straight-time portion of overtime pay for hours in a firefighter's regular tour of duty is treated as basic pay only for the following purposes:
     
    
        
        (1) 
         Retirement deductions and benefits under chapters 83 and 84 of title 5, United States Code;
     
    
        
        (2) 
         Life insurance premiums and benefits under chapter 87 of title 5, United States Code;
     
    
        
        (3) 
         Severance pay under  section 5595 of title 5, United States Code;
     
    
        
        (4) 
         Cost-of-living allowances and post differentials under  section 5941 of title 5, United States Code; and
     
    
        
        (5) 
         Advances in pay under  section 5524a of title 5, United States Code.
     
    
        
        (b) 
         The straight-time portion of overtime pay for hours in a firefighter's regular tour of duty is derived by multiplying the applicable firefighter hourly rate of basic pay computed under  § 550.1303(a) and (b)(2) by the number of overtime hours in the firefighter's regular tour of duty.
     
    
        
        (c) 
         Pay for any nonovertime hours outside a firefighter's regular tour of duty is computed using the firefighter hourly rate of basic pay as provided in  § 550.1303(a) and (b)(2), but that pay is not considered basic pay for any purpose, except in applying  §§ 550.105 and 550.106.
     
    
        
        (d) 
         For firefighters compensated under  § 550.1303(b), pay for nonovertime hours within the regular tour of duty, but outside the basic 40-hour workweek, is basic pay only for the purposes listed in paragraph (a) of this section and for the purpose of applying  § 410.402(b)(6) of this chapter and  §§ 550.105 and 550.106.
     
    
        
        (e) 
         Locality pay under 5 U.S.C. 5304 is basic pay for firefighters only to the extent provided in this subpart,  § 531.610 of this chapter, or other specific provision of law.
     
    
        
            Code of Federal Regulations
        
        [63 FR 64593, Nov. 23, 1998, as amended at 67 FR 15467, Apr. 2, 2002; 70 FR 31314, May 31, 2005]