PurposeThe purpose of this study is to examine the effect of consolidating off-balance sheet entities on firm-level investment efficiency. Financial Accounting Standards Board Interpretation No. 46, consolidation of variable interest entities – an Interpretation of ARB No. 51 (FIN 46) is used as a quasi-exogenous shock to financial reporting in this study.Design/methodology/approachThe authors empirically test the change of investment efficiency for a sample of firms affected by FIN 46 in the post-FIN 46 periods. In the regression, a group of matched pairs selected from unaffected firms is used as the control sample and firm characteristics are used as control variables.FindingsThe authors find that firms affected by FIN 46 experience improvement in investment efficiency after adopting the standard compared to unaffected firms. The authors also document that FIN 46 firms’ level of investment decreases after FIN 46 compared to unaffected firms. These empirical results suggest that the improvement in investment efficiency is likely to be achieved by the reduction in over-investment. Further analyses show that amongst the affected firms, firms consolidating off-balance sheet special purpose entities (SPEs) improve investment efficiency mainly by reducing over-investment, whereas firms avoiding the consolidation of SPEs do not display such tendency.Originality/valueThis study contributes to the literature on the relation between financial reporting and investment efficiency, as well as the literature on the impact of FIN 46. To the best of the authors’ knowledge, this study is the first to examine the relation between the consolidation of off-balance sheet entities and investment efficiency.