In classical literatures, the informal sector is regarded as all those economic activities that are neither taxed nor monitored by any form of government. However, with the downturn of economic activities in Nigeria due to the dwindling oil revenue which forms the major revenue generation and export earnings of Nigeria, the informal sector, specifically the motorcycle transport business popularly known in Nigeria as Okada has come under some form of government taxation and monitoring in some states in the country. This was to shore up their revenue base which has dwindled over the years. Extant literatures have not been able to examine the contribution of informal sector, specifically, the motorcycle transport business to internally generated revenue of the sub-units, especially Ebonyi State within the period under study. Thus, we pose the question: has the taxation of the motorcycle transport business operation improved on the internally generated revenue of Ebonyi State between 2015 and 2021? We anchored our analysis on Public Choice Theory of politics and economics. Data for the study were collected through both primary and secondary sources. The study found that despite the intensive taxation of the informal sector in Ebonyi State, specifically, the motorcycle transport business; the internally generated revenue of the state seems to be decreasing rather than increasing, given the number of taxable objects that has been brought under its internally generated revenue sources. The study recommended that the government should do more in the area of its internally generated revenue to ensure efficiency in collectability and remittances.