Aon (AON) 10-Q 2005 Q2 Quarterly report

Exhibit 12(a)

Aon Corporation and Consolidated Subsidiaries
Combined With Unconsolidated Subsidiaries
Computation of Ratio of Earnings to Fixed Charges

	Six Months Ended March 31,				Years Ended December 31,
(millions except ratios)	2005		2004		2004		2003		2002		2001			2000
Income from continuing operations before provision for income taxes and minority interest	$	605	$	582	$	880	$	1,131	$	840	$	367		$	846
Less: Earnings from unconsolidated entities under the equity method of accounting	3		38		34		49		19		(139		)	44
Add back fixed charges:
Interest on indebtedness	65		69		136		101		124		127			140
Interest credited on deposit-type insurance contracts	—		—		1		—		29		56			71
Portion of rents representative of interest factor	35		34		73		67		59		57			54
Income as adjusted	$	702	$	647	$	1,056	$	1,250	$	1,033	$	746		$	1,067
Fixed charges:
Interest on indebtedness (1)	$	65	$	69	$	136	$	101	$	124	$	127		$	140
Interest credited on deposit-type insurance contracts	—		—		1		—		29		56			71
Portion of rents representative of interest factor	35		34		73		67		59		57			54
Total fixed charges	$	100	$	103	$	210	$	168	$	212	$	240		$	265
Ratio of earnings to fixed charges	7.0		6.3		5.0		7.4		4.9		3.1			4.0

(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 ($29 million for both the six months ended June 30, 2005 and 2004 and $58 million for the year ended December 31, 2004) on these notes payable is reported as part of interest expense on the condensed consolidated statements of income.

Exhibit 12(b)

Aon Corporation and Consolidated Subsidiaries
Combined With Unconsolidated Subsidiaries
Computation of Ratio of Earnings to Combined Fixed Charges
and Preferred Stock Dividends

	Six Months Ended March 31,				Years Ended December 31,
(millions except ratios)	2005		2004		2004		2003		2002		2001			2000
Income from continuing operations before provision for income taxes and minority interest	$	605	$	582	$	880	$	1,131	$	840	$	367		$	846
Less: Earnings from unconsolidated entities under the equity method of accounting	3		38		34		49		19		(139		)	44
Add back fixed charges:
Interest on indebtedness	65		69		136		101		124		127			140
Interest credited on deposit-type insurance contracts	—		—		1		—		29		56			71
Portion of rents representative of interest factor	35		34		73		67		59		57			54
Income as adjusted	$	702	$	647	$	1,056	$	1,250	$	1,033	$	746		$	1,067
Fixed charges and preferred stock dividends:
Interest on indebtedness (1)	$	65	$	69	$	136	$	101	$	124	$	127		$	140
Preferred stock dividends (2)	2		2		3		61		58		70			70
Interest and dividends	67		71		139		162		182		197			210
Interest credited on deposit-type insurance contracts	—		—		1		—		29		56			71
Portion of rents representative of interest factor	35		34		73		67		59		57			54
Total fixed charges and preferred stock dividends	$	102	$	105	$	213	$	229	$	270	$	310		$	335
Ratio of earnings to combined fixed charges and preferred stock dividends	6.9		6.2		5.0		5.5		3.8		2.4			3.2

(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 ($29 million for both the six months ended June 30, 2005 and 2004 and $58 million for the year ended December 31, 2004) on these notes payable is reported as part of interest expense on the condensed consolidated statements of income.

(2)Included in preferred stock dividends are $57 million and $54 million for the years ended December 31, 2003 and 2002, respectively, and $66 million for the years ended December 31, 2001 and 2000 of pretax distributions on the capital securities.