Since 1998, the WTO Members have applied a moratorium against tariffs on international electronic transmissions (commonly referred to as the WTO "E-Commerce" Moratorium). However, some WTO Members have recently debated whether the moratorium remains in their economic interest, given the potential revenues that might be generated by imposing tariffs on electronic transmissions. This study examines the impact on India, Indonesia, South Africa and China (and the general case for developing countries) and concludes that imposing such tariffs would be fiscally counter-productive. Putting aside any legal questions, a country that opted out of the moratorium may apply tariffs that affect a wide range of cross-border business activities. Our research shows that if countries ceased to uphold the moratorium and levied import duties on digital goods and services, they would suffer negative economic consequences in the form of higher prices and reduced consumption, which would in turn slow GDP growth and shrink tax revenues. Yet our research indicates that the payoff in tariff revenues would ultimately be minimal relative to the scale of economic damage that would result from import duties on electronic transmissions.