Tax and Investment: Two Pillars of Economic Growth
Economic growth in developing countries depends heavily on two interconnected forces: government tax revenue and private investment. Tax revenue funds infrastructure, education, and public services, while private investment expands production capacity, creates jobs, and drives innovation.
However, taxation can produce both positive and negative outcomes. Efficient tax systems can stimulate growth by financing development. Excessive or poorly structured taxes, on the other hand, can discourage business investment.
The study from Nwafor Orizu College of Education and Chukwuemeka Odumegwu Ojukwu University highlights a key insight: tax revenue alone does not determine economic growth. The level of private investment changes how taxation influences economic performance.
Understanding this interaction is essential as Nigeria continues to reform its tax system and attract private sector investment.
Thirty Years of Economic Data Analyzed
The researchers examined annual economic data covering the period from 1994 to 2023. They analyzed:
- Corporate income tax revenue
- Value-added tax revenue
- Private investment levels
- Real gross domestic product (GDP), the standard measure of economic growth
These data were obtained from credible national and international sources, including the Central Bank of Nigeria and the World Bank.
The researchers used advanced statistical modeling to evaluate both short-term and long-term relationships between tax revenue, investment, and economic growth.
This approach allowed them to identify not only direct effects but also how private investment modifies the impact of taxes.
Private Investment Boosts Corporate Tax Benefits
The study revealed a clear and important pattern.
Private investment strengthens the positive impact of corporate income tax on economic growth.
In the long term:
- A 1 percent increase in the combined effect of private investment and corporate tax increased economic output significantly.
- Private investment amplified the effectiveness of corporate taxation as a driver of growth.
This means corporate tax revenue contributes more to economic growth when the private sector is actively investing.
The findings show that tax revenue and private investment work together as complementary forces.
Value-Added Tax Shows Mixed or Negative Interaction
The study found a different pattern with value-added tax (VAT), which is a consumption-based tax.
Private investment had:
- Negative or mixed interaction with VAT in both short- and long-term analysis
- A tendency to reduce VAT’s positive contribution to economic growth in some cases
This suggests consumption taxes may have unintended effects when combined with private sector expansion.
One explanation is that VAT increases costs across supply chains, which may limit investment-driven growth.
Short-Term Effects Also Positive but Smaller
In the short term, the study found:
- Corporate income tax had a small positive effect on economic growth
- Value-added tax also contributed positively
- Private investment independently increased economic output
The economy adjusted toward long-term equilibrium at a speed of 26.1 percent per year after disruptions.
This confirms a stable long-term relationship between tax revenue, private investment, and growth.
Researchers Highlight Strategic Role of Private Investment
The researchers emphasized that private investment plays a central moderating role in economic development.
Ifeoma Florence Okpalanwabude and colleagues from Nwafor Orizu College of Education explained that private investment enhances the growth effects of corporate taxation while producing different outcomes for consumption-based taxes.
Their analysis demonstrates that tax policy effectiveness depends heavily on investment conditions.
This finding reinforces the importance of encouraging private sector participation in the economy.
Implications for Economic Policy and Development
The study provides important guidance for policymakers in Nigeria and other developing economies.
Key policy implications include:
These findings are particularly relevant as Nigeria seeks to diversify its economy and reduce dependence on oil revenue.
A strong private sector can enhance tax revenue productivity and long-term growth.
Broader Significance for Developing Economies
The study contributes to a growing body of evidence showing that taxation alone cannot drive economic growth.
Investment plays a critical role in determining whether tax revenue supports or hinders development.
For developing economies facing fiscal challenges, attracting private investment may be as important as increasing tax collection.
This insight has global relevance, especially for countries working to balance fiscal sustainability with economic expansion.
Author Profiles
Source
Moderating Effect of Private Investment on the Relationship Between Tax Revenue and Economic Growth in Nigeria
International Journal of Management and Business Intelligence, 2026
DOI: https://doi.org/10.59890/ijmbi.v4i1.320
Official URL: https://dmimultitechpublisher.my.id/index.php/ijmb
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