In order to identify the variable that contributed most to the variation in Nigeria’s total federal collected revenue, the individual effect of the fousr independent variables above were considered using R2 change (Rc2) which is the difference between the R2 with ith independent variable and R2 without ith variable where the ith is the variable that enter the equation next. In this study, table 1 revealed that the R2 for value added tax is 0.861 while that of petroleum profit tax is 0.12 (0.873-0.861) while company income tax is 0.42 (0.915-0.873) and that of education tax is 0.27 (0.942-0.915). From this, value added tax attracted the greatest importance. The implication of this result is that value added tax has contributed most to total federal collected revenue in Nigeria thus justifying the fact that value added tax has a significant effect on total federal collected revenue in Nigeria and an improved strategy such as monitoring aimed at improving the value added tax which will boost the total federal collected revenue in the country. This agrees with the position of Adekanola (2007) who observed that value added tax in this part of the world is seen largely as a major source of nations collected revenue.