We estimate the effect of temporary tax incentives on equipment investment using shifts in accelerated depreciation. Analyzing data for over 120,000 firms, we present three findings. First, bonus depreciation raised investment in eligible capital relative to ineligible capital by 10.4 percent between 2001 and 2004 and 16.9 percent between 2008 and 2010. Second, small firms respond 95 percent more than big firms. Third, firms respond strongly when the policy generates immediate cash flows, but not when cash flows only come in the future. This heterogeneity materially affects investment-weighted estimates and supports models in which financial frictions or fixed costs amplify investment responses. (JEL D21, D22, D92, G31, H25, H32)

for comments. Laurence O'Brien and Igor Kuznetsov provided excellent research assistance. João Granja gratefully acknowledges support from the Jane and Basil Vasiliou Faculty Scholarship and from the Booth School of Business at the University of Chicago. Yannelis and Zwick gratefully acknowledges financial support from the Booth School of Business at the University of Chicago. We are grateful to the Small Business Administration, Womply, and Homebase for providing data. This draft is preliminary and comments are welcome. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research. At least one co-author has disclosed a financial relationship of potential relevance for this research. Further information is available online at http://www.nber.org/papers/w27095.ack NBER working papers are circulated for discussion and comment purposes. They have not been peer-reviewed or been subject to the review by the NBER Board of Directors that accompanies official NBER publications.

NBER working papers are circulated for discussion and comment purposes. They have not been peer-reviewed or been subject to the review by the NBER Board of Directors that accompanies official NBER publications.

for comments. Laurence O'Brien and Igor Kuznetsov provided excellent research assistance. João Granja gratefully acknowledges support from the Jane and Basil Vasiliou Faculty Scholarship and from the Booth School of Business at the University of Chicago. Yannelis and Zwick gratefully acknowledge financial support from the Booth School of Business at the University of Chicago. We are grateful to the Small Business Administration, Homebase, Womply, and Opportunity Insights for data, and to the CDBA for helping us understand the institutional background. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.At least one co-author has disclosed a financial relationship of potential relevance for this research. Further information is available online at http://www.nber.org/papers/w27095.ack NBER working papers are circulated for discussion and comment purposes. They have not been peer-reviewed or been subject to the review by the NBER Board of Directors that accompanies official NBER publications.

Sahai, and Iris Song provided excellent research assistance. DeFusco and Nathanson thank the Guthrie Center for Real Estate Research for financial support, and Zwick gratefully acknowledges financial support from the Fama Miller Center and Booth School of Business at the University of Chicago. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research. NBER working papers are circulated for discussion and comment purposes. They have not been peerreviewed or been subject to the review by the NBER Board of Directors that accompanies official NBER publications.