This research seeks to comparatively identify the revenue performances of the oil and non-oil tax revenue with regards to Nigeria’s GDP. In comparing these independent variables against the GDP, it is observed that there has been umpteenth reliance of government tax revenue and the GDP on oil tax revenue causing a neglect in revitalising non-oil tax revenue sectors. Data for this research comprised of revenue figures over the period 2004-2013. Results were analysed using statistical packages for social science (SPSS) version 15.0. The findings were that oil tax revenue has outperformed non-oil tax revenue, oil and non-oil tax revenue has positively impacted the GDP and that the neglect of the non-oil tax created an atmosphere of reliance on oil tax revenue. From the study, it was recommended that the FIRS gear up efforts to optimise non-oil tax revenue collection by using special audit teams, investigation and stiffer penalties for tax evaders. Also sensitise and encourage voluntary self-compliance and implementation of a carefully planned National Tax Policy. Thirdly, the FIRS, must advice the government on emerging and failing sectors for development purposes.