In this paper, we test for Wagner's law for 15 Indian states. We consider nine panels of states based on geography and level of economic development. Using panel unit-root, panel-cointegration, and panel-Granger causality analysis, we unravel strong evidence of Wagner's law. However, we find that the Wagner's law relationship is consumption rather than capital expenditure driven. This is a fresh revelation and our results are robust to different model specifications. © 2012 Elsevier B.V.