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This study investigates the impact of institutional quality and banking competition on shadow economy for 127 economies for the period of 2005–2017. It further explores if institutional quality/competition shapes the relationship differently between banking competition/institutional quality and shadow economy. This paper uses the system GMM estimator to tackle potential omitted variable bias, endogeneity, and simultaneity issues. The findings suggest that overall, greater competition among banks and stricter institutions in the country reduce the size of shadow economy. Furthermore, impact of competition on shadow economy is even stronger in countries with weak institutions and the impact of institutional quality is greater in lower competitive environment. Only severe competition matters for shadow economy in case of developed countries. To sum up the novel findings of this research, competition and institutions complement each other in reducing the size of shadow economy. These findings are robust to different econometric estimators. The findings carry vital policy implications for the governments and regulators to play their part in reducing the shadow economy. [ABSTRACT FROM AUTHOR]