This study examines the effect of the 2007 reform pertaining to the corporate tax system on the tax burden of listed firms in Nigeria using the “t” test and canonical correlation analysis. Data were collected from the financial statements of the 86 sampled firms for the period 2003-2011 subdivided into pre-reform (2003-2006) and post reform (2008-2011) sub-periods for the purpose of comparing periods’ tax burdens. Data were also segregated along the Nigerian Stock Exchange industrial sector classifications. This study finds, on the whole, that the 2007 corporate tax reform has brought no additional tax burden on listed firms, however, sectoral analysis reveals the heterogeneity in the effect of the tax reform as firms within the agricultural and natural resources sectors witnessed increases in tax burden while firms in health and oil and gas sectors were favoured with reduced tax burden. The tax burden of other sectors is unaffected by the reform.