One of the important factors for economic development is the existence of an effective tax system. The paper, which is the second part of Le, Moreno-Dodson, and Rojchaichaninthorn (2008), deals with the concept and empirical estimation of countries' taxable capacity and tax effort to develop further country tax effort typologies. It employs a cross-country study from a sample of 110 developing and developed countries during 1994-2009. Taxable capacity refers to the predicted tax to gross domestic product ratio that can be estimated with the regression, taking into account a country's specific macroeconomic, demographic, and institutional features. Tax effort is defined as an index of the ratio between the share of the actual tax collection in gross domestic product and the predicted taxable capacity. The use of tax effort and actual tax collection benchmarks allows us to rank countries into four different groups: low tax collection, low tax effort; high tax collection, high tax effort; low tax collection, high tax effort; and high tax collection, low tax effort. This classification is based on the benchmark of the global average of tax collection and a tax effort index. The analysis provides guidance for tax reforms in countries with various levels of tax collection and tax effort.