EXHIBIT 12.1

CDW CORPORATION

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

(unaudited)

	Years ended December 31,										Six months ended June 30,
(dollars in millions)	2012		2013		2014		2015		2016		2016		2017
Computation of earnings:
Income (loss) before income taxes and adjustment for (income) loss from equity investees	$	185.8	$	194.9	$	385.5	$	657.2	$	671.2	$	310.5	$	268.8
Distributed income from equity investees		1.2		1.0		1.1		1.0		1.1		0.7		0.2
Fixed charges		312.4		254.3		202.8		164.5		153.9		77.7		77.7
Total earnings	$	499.4	$	450.2	$	589.4	$	822.7	$	826.2	$	388.9	$	346.8
Computation of fixed charges:
Interest expense	$	294.4	$	241.8	$	191.3	$	153.5	$	141.8	$	72.0	$	71.9
Amortization of deferred financing costs and debt premium		13.6		8.8		6.4		6.4		6.5		3.3		3.7
Portion of rent expense representative of interest (1)		4.4		3.7		5.1		4.6		5.6		2.4		2.2
Total fixed charges	$	312.4	$	254.3	$	202.8	$	164.5	$	153.9	$	77.7	$	77.7
Ratio of earnings to fixed charges		1.6		1.8		2.9		5.0		5.4		5.0		4.5

⁽¹⁾ Fixed charges include a reasonable estimation of the interest factor included in rental expense.