Wintrust Financial (WTFC) S-3ASR Automatic shelf registration

Exhibit 12.1

Wintrust Financial Corporation

Computation of Ratio of Earnings to Fixed Charges

The following table presents the calculation of the ratio of earnings to fixed charges for the nine months ended September 30, 2008 and the last five fiscal years.

(dollars in thousands)

		Nine
		Months Ended
		September 30,			Years ended December 31,
		2008			2007			2006			2005			2004			2003
Income before income taxes	A	$	27,914		$	83,824		$	104,241		$	104,950		$	80,887		$	59,344
Interest expense:
Interest on deposits		$	168,697		$	294,914		$	265,729		$	156,252		$	83,135		$	67,963
Interest on other borrowings	C		38,386			55,093			43,330			34,025			20,787			15,536
Total interest expense	B	$	207,083		$	350,007		$	309,059		$	190,277		$	103,922		$	83,499
Ratio of earnings to fixed charges:
Including deposit interest	(A+B) / B		1.13	x		1.24	x		1.34	x		1.55	x		1.78	x		1.71	x
Excluding deposit interest	(A+C) / C		1.73	x		2.52	x		3.41	x		4.08	x		4.89	x		4.82	x