It is well recognized that liquid storage tanks possess low ductility and energy absorbing capacity as compared to the conventional buildings. Accordingly, various design codes provide higher level of design seismic forces for tanks. In this article, provisions of IBC 2000, Euro code 8, and NZSEE guidelines are reviewed to assess the severity of design seismic forces for tanks than those for buildings. It is seen that, depending on the type of tank, design seismic force for tanks can be to 7 times higher than that for buildings. Based on the comparison of provisions in these documents, various similarities, discrepancies and limitations are found in their provisions.