Exhibit 12.1

Aon plc and Consolidated Subsidiaries

Combined With Unconsolidated Subsidiaries

Computation of Ratio of Earnings to Fixed Charges

	Nine Months Ended
	September 30					Years Ended December 31,
(millions except ratio)	2012		2011			2011		2010			2009		2008		2007
Income from continuing operations before income taxes and noncontrolling interests	$	971	$	1,000		$	1,384	$	1,059		$	949	$	879	$	1,023
Less: Equity in earnings on less than 50% owned entities	8		(7		)	7		10			11		5		6
Add back fixed charges:
Interest on indebtedness	173		186			245		182			122		126		138
Interest on uncertain tax positions	3		1			—		(1		)	2		—		2
Portion of rents representative of interest factor	27		37			55		48			48		47		75
Income as adjusted	$	1,166	$	1,231		$	1,677	$	1,278		$	1,110	$	1,047	$	1,232
Fixed charges:
Interest on indebtedness	$	173	$	186		$	245	$	182		$	122	$	126	$	138
Interest on uncertain tax positions	3		1			—		(1		)	2		—		2
Portion of rents representative of interest factor	27		37			55		48			48		47		75
Total fixed charges	$	203	$	224		$	300	$	229		$	172	$	173	$	215
Ratio of earnings to fixed charges	5.7		5.5			5.6		5.6			6.5		6.1		5.7