EX-12.(A) 3 a2084204zex-12_a.htm EX 12(A)
QuickLinks -- Click here to rapidly navigate through this document


Exhibit 12(a)


AON CORPORATION AND CONSOLIDATED SUBSIDIARIES
COMBINED WITH UNCONSOLIDATED SUBSIDIARIES
COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
(millions except ratios)

 
   Three Months Ended
March 31,
   Years Ended December 31,
 
   2002
   2001
   2001
   2000
   1999
   1998
   1997
 
   (Restated)

   (Restated)

    
    
    
    
    
Income before provision for income taxes and minority interest    $ 271   $ 48   $ 309   $ 854   $ 635   $ 931   $ 542

ADD BACK FIXED CHARGES:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  Interest on indebtedness     29     36     127     140     105     87     70
  Interest credited on investment-type insurance contracts     12     16     56     71     77     72     45
  Interest on ESOP     —     —     —     —     1     2     3
  Portion of rents representative of interest factor     15     14     57     54     49     51     44
   
 
 
 
 
 
 
    INCOME AS ADJUSTED   $ 327   $ 114   $ 549   $ 1,119   $ 867   $ 1,143   $ 704
   
 
 
 
 
 
 
FIXED CHARGES:                                          
  Interest on indebtedness   $ 29   $ 36   $ 127   $ 140   $ 105   $ 87   $ 70
  Interest credited on investment-type insurance contracts     12     16     56     71     77     72     45
  Interest on ESOP     —     —     —     —     1     2     3
  Portion of rents representative of interest factor     15     14     57     54     49     51     44
   
 
 
 
 
 
 
    TOTAL FIXED CHARGES   $ 56   $ 66   $ 240   $ 265   $ 232   $ 212   $ 162
   
 
 
 
 
 
 
RATIO OF EARNINGS TO FIXED CHARGES     5.8     1.7     2.3     4.2     3.7     5.4     4.3
   
 
 
 
 
 
 


QuickLinks

AON CORPORATION AND CONSOLIDATED SUBSIDIARIES COMBINED WITH UNCONSOLIDATED SUBSIDIARIES COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES (millions except ratios)