Exhibit 12.1

Aon plc and Consolidated Subsidiaries

Combined With Unconsolidated Subsidiaries

Computation of Ratio of Earnings to Fixed Charges

	Years Ended December 31,
(millions except ratio)	2016		2015		2014		2013		2012
Income from continuing operations before income taxes and noncontrolling interests	$	1,669	$	1,689	$	1,765	$	1,538	$	1,380
Less: Equity in earnings on less than 50% owned entities	13		13		12		20		13
Add back fixed charges:
Interest on indebtedness	282		273		255		210		228
Interest on uncertain tax positions	—		—		4		5		5
Portion of rents representative of interest factor	32		45		50		52		42
Income as adjusted	$	1,970	$	1,994	$	2,062	$	1,785	$	1,642
Fixed charges:
Interest on indebtedness	$	282	$	273	$	255	$	210	$	228
Interest on uncertain tax positions	—		—		4		5		5
Portion of rents representative of interest factor	32		45		50		52		42
Total fixed charges	$	314	$	318	$	309	$	267	$	275
Ratio of earnings to fixed charges	6.3		6.3		6.7		6.7		6.0