There are considerable studies regarding the contribution of international migrants' remittances to economic growth while there is a lack of studies which investigate the effect of remittances on shadow economy. The authors explore empirically the effect of remittances and its interaction effect with tax on shadow economy by using panel data covering the period 2004-2015 and applying the GMM method for 141 countries. Their empirical model, in which a remittance-recipient government, operating in tax environment of some regimes (imposition of different levels and kinds of taxes), predicts a negative effect of remittances on shadow economy, is mitigated by a higher tax regime. In other words, the paper argues that a well-established negative correlation between remittances and shadow economy has been weakened by tax rule. The study contributes to the current literature on public policy that gives importance to know the causes of shadow economy and boost remittances effect. The authors' baseline results are robust to various computations of macroeconomics variables, institutions variables and freedom variables.