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Impact of Fiscal Deficit on Government Revenue Generation in Nigeria

Abstract

Fiscal deficit has become a major macroeconomic concern due to its implications for public finance, fiscal sustainability, government revenue generation, and economic development. Fiscal deficit occurs when government expenditure exceeds government revenue within a given fiscal period, thereby necessitating borrowing or other financing mechanisms to bridge the financing gap. In developing economies such as Nigeria, persistent fiscal deficits have been driven by increasing public expenditure, declining oil revenues, weak tax compliance, rising debt servicing obligations, subsidy payments, infrastructure deficits, and economic shocks. These deficits have raised concerns regarding the government's capacity to mobilize adequate revenue to finance public expenditure without compromising fiscal stability. Government revenue generation remains essential for financing public infrastructure, education, healthcare, security, and other socio-economic development programmes. Consequently, the Federal Government has implemented various fiscal reforms, including tax administration modernization, digital revenue collection systems, expansion of the tax base, and non-oil revenue diversification initiatives aimed at strengthening domestic revenue mobilization. However, persistent fiscal deficits may weaken fiscal discipline, increase public borrowing, constrain revenue-generating investments, and adversely affect the efficiency of public financial management. Although previous studies have examined fiscal policy and economic growth, empirical evidence regarding the impact of fiscal deficit on government revenue generation in Nigeria remains limited and inconclusive. Against this background, this study investigates the impact of fiscal deficit on government revenue generation in Nigeria. The study is anchored on Keynesian Fiscal Theory, the Fiscal Illusion Theory, and the Public Finance Theory. Keynesian Fiscal Theory posits that fiscal deficits may stimulate economic activities and increase future government revenues when borrowed funds are invested in productive sectors of the economy. Fiscal Illusion Theory argues that persistent fiscal deficits may distort taxpayers' perception of the actual cost of government spending, thereby influencing fiscal behaviour and revenue mobilization. Public Finance Theory emphasizes the importance of efficient fiscal management, prudent public expenditure, and effective revenue mobilization in achieving sustainable economic development and fiscal stability. Collectively, these theoretical perspectives provide a comprehensive framework for explaining the relationship between fiscal deficit and government revenue generation in Nigeria. The study adopts an ex post facto research design utilizing secondary data obtained from the Central Bank of Nigeria (CBN), the Federal Ministry of Finance, the Budget Office of the Federation, the National Bureau of Statistics (NBS), the Federal Inland Revenue Service (FIRS), and the Debt Management Office (DMO). A time-series research design covering a twenty-year period will be employed to examine the relationship between fiscal deficit and government revenue generation. Fiscal deficit will be measured using the annual fiscal deficit, fiscal deficit-to-Gross Domestic Product (GDP) ratio, budget deficit, and fiscal balance, while government revenue generation will be measured using total government revenue, tax revenue, non-tax revenue, oil revenue, non-oil revenue, and internally generated revenue. Data analysis will involve descriptive statistics to summarize the characteristics of the study variables, correlation analysis to determine the degree of association among variables, and time-series econometric techniques, including Ordinary Least Squares (OLS), Autoregressive Distributed Lag (ARDL), and Error Correction Model (ECM), depending on the time-series properties of the data. Diagnostic tests including unit root tests, cointegration tests, heteroskedasticity, autocorrelation, multicollinearity, normality, stability tests, and model specification tests will be conducted to ensure the validity, consistency, and robustness of the empirical findings. The study anticipates that fiscal deficit will have a significant impact on government revenue generation in Nigeria. Productive fiscal deficits arising from strategic public investments are expected to stimulate economic growth, expand the tax base, improve business activities, and increase government revenue over time. Conversely, persistent and unsustainable fiscal deficits resulting from recurrent expenditure, inefficient public spending, and excessive borrowing may reduce fiscal efficiency, increase debt servicing obligations, crowd out productive investments, and weaken revenue generation capacity. Furthermore, prudent fiscal management, improved expenditure control, enhanced tax administration, and effective revenue diversification strategies are expected to strengthen domestic revenue mobilization and improve fiscal sustainability. Consequently, effective fiscal deficit management is expected to contribute significantly to improving government revenue generation, fiscal stability, and long-term economic development in Nigeria. This study is expected to make significant theoretical and empirical contributions to the literature on public finance, government accounting, fiscal policy, and macroeconomic management by providing comprehensive evidence on the relationship between fiscal deficit and government revenue generation in Nigeria. Unlike previous studies that broadly examined fiscal policy or economic growth, this research specifically evaluates fiscal deficit as a determinant of government revenue generation using a longitudinal time-series approach and multiple indicators of fiscal performance. The findings will provide valuable insights for the Federal Ministry of Finance, the Budget Office of the Federation, the Central Bank of Nigeria (CBN), the Federal Inland Revenue Service (FIRS), the Debt Management Office (DMO), policymakers, development partners, public finance practitioners, and academic researchers regarding the strategic importance of prudent fiscal deficit management in enhancing government revenue mobilization and fiscal sustainability. The study will also provide evidence-based recommendations for strengthening fiscal discipline, expanding the tax base, improving expenditure efficiency, promoting non-oil revenue diversification, reducing excessive borrowing, and fostering sustainable public financial management and economic development in Nigeria.

Keywords: Fiscal deficit, government revenue generation, fiscal policy, public finance, tax revenue, non-oil revenue, Autoregressive Distributed Lag (ARDL), Federal Inland Revenue Service (FIRS), Nigeria, fiscal sustainability.