To explain the shadow economy in the Baltic states of Estonia, Lithuania and Latvia, this paper evaluates the relationship between the shadow economy and tax morale. Viewing tax morale as a measure of the symmetry between the codified laws and regulations of formal institutions (state morality) and the unwritten socially shared rules of informal institutions (civic morality), the proposition is that the lower the tax morale (i.e. the greater the asymmetry between state morality and civic morality), the greater is the likelihood to participate in the shadow economy. To evaluate this, a 2013 survey is reported involving 3036 face-to-face interviews in these 3 Baltic nations. Using logistic regression analysis, the finding is that the likeliho...