Exhibit 12.1

Aon Corporation and Consolidated Subsidiaries

Combined With Unconsolidated Subsidiaries

Computation of Ratio of Earnings to Fixed Charges

	Nine Months Ended
	Sept. 30,						Years Ended December 31,
(millions except ratios)	2009			2008			2008		2007			2006		2005		2004
Income from continuing operations before provision for income taxes and noncontrolling interests	$	733		$	703		$	879	$	1,025		$	738	$	567	$	519
Less: Earnings from unconsolidated entities under the equity method of accounting	10			2			5		6			5		7		3
Add back fixed charges:
Interest on indebtedness	87			96			126		138			129		125		136
Interest on uncertain tax positions	(2		)	(1		)	—		(2		)	—		—		—
Portion of rents representative of interest factor	30			39			47		75			79		71		73
Income as adjusted	$	838		$	835		$	1,047	$	1,230		$	941	$	756	$	725
Fixed charges:
Interest on indebtedness	$	87		$	96		$	126	$	138		$	129	$	125	$	136
Portion of rents representative of interest factor	30			39			47		75			79		71		73
Total fixed charges	$	117		$	135		$	173	$	213		$	208	$	196	$	209
Ratio of earnings to fixed charges	7.2			6.2			6.1		5.8			4.5		3.9		3.5

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