Exhibit 12(a)
Aon Corporation and Consolidated Subsidiaries
Combined With Unconsolidated Subsidiaries
Computation of Ratio of Earnings to Fixed Charges
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| Nine Months Ended |
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| Sept. 30, |
| Years Ended December 31, |
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(millions except ratios) |
| 2007 |
| 2006 |
| 2006 |
| 2005 |
| 2004 |
| 2003 |
| 2002 |
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Income from continuing operations before provision for income taxes and minority interest |
| $ | 989 |
| $ | 672 |
| $ | 920 |
| $ | 808 |
| $ | 733 |
| $ | 960 |
| $ | 676 |
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Less: Earnings from unconsolidated entities under the equity method of accounting |
| 5 |
| 3 |
| 4 |
| 7 |
| 34 |
| 49 |
| 19 |
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Add back fixed charges: |
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Interest on indebtedness (1) |
| 102 |
| 99 |
| 129 |
| 125 |
| 136 |
| 101 |
| 124 |
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Interest on FIN 48 liabilities |
| (1 | ) | — |
| — |
| — |
| — |
| — |
| — |
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Interest credited on deposit-type insurance contracts |
| — |
| — |
| — |
| — |
| 1 |
| — |
| 29 |
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Portion of rents representative of interest factor |
| 54 |
| 55 |
| 79 |
| 71 |
| 73 |
| 67 |
| 59 |
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Income as adjusted |
| $ | 1,139 |
| $ | 823 |
| $ | 1,124 |
| $ | 997 |
| $ | 909 |
| $ | 1,079 |
| $ | 869 |
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Fixed charges: |
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Interest on indebtedness (1) |
| $ | 102 |
| $ | 99 |
| $ | 129 |
| $ | 125 |
| $ | 136 |
| $ | 101 |
| $ | 124 |
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Interest credited on deposit-type insurance contracts |
| — |
| — |
| — |
| — |
| 1 |
| — |
| 29 |
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Portion of rents representative of interest factor |
| 54 |
| 55 |
| 79 |
| 71 |
| 73 |
| 67 |
| 59 |
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Total fixed charges |
| $ | 156 |
| $ | 154 |
| $ | 208 |
| $ | 196 |
| $ | 210 |
| $ | 168 |
| $ | 212 |
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Ratio of earnings to fixed charges |
| 7.3 |
| 5.3 |
| 5.4 |
| 5.1 |
| 4.3 |
| 6.4 |
| 4.1 |
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(1) |
| As a result of the adoption of FIN 46 on December 31, 2003, Aon was required to deconsolidate its 8.205% mandatorily redeemable preferred capital securities. This decrease was offset by an increase in notes payable. Beginning in 2004, interest expense ($43 million for both the nine months ended September 30, 2007 and 2006 and $58 million for the years ended December 31, 2006, 2005 and 2004) on these notes payable is reported as part of interest expense on the condensed consolidated statements of income. |