Tax Revenue Emerges as Dominant Force in Nigeria's Federal Income Amid Oil Decline
According to a recent report by Quartus Economics, Nigeria's fiscal landscape has undergone a dramatic transformation over the past 15 years, with tax revenue surging by over 87% to become the primary driver of federal collected revenues. The report, which analyzed fiscal trends from 2010 to 2025, highlights a significant shift away from the country's long-standing dependence on crude oil earnings.
Sharp Decline in Oil Revenue and Rise of Non-Oil Sources
The report details that oil revenue, which accounted for as much as 73.9% of total federation revenues in 2010, declined sharply to 25.8% by 2024. In contrast, non-oil revenues rose from about 25% in 2010 to nearly 75% in 2024, driven by sustained reforms in tax administration and policy. Over the 15-year period, Nigeria generated a total of N161.1 trillion in federation revenues, split almost evenly between oil sources at N80.6 trillion (49.99%) and non-oil sources at N80.57 trillion (50.01%).
Impact of Fiscal Crisis and Economic Challenges
This transformation followed the fiscal crisis triggered by the 2014 oil price collapse, which exposed Nigeria's vulnerability to commodity shocks. The report notes that economic growth slowed sharply from 6.1% to 1.2% annually, while gross domestic product (GDP) per capita plunged by nearly 75% from $4,332 in 2014 to about $1,120 in 2024. Poverty worsened significantly, with an additional 65 million Nigerians falling below the poverty line by 2023.
Rising Public Debt and Revenue Performance
In response to these challenges, the government ramped up borrowing, leading to a surge in public debt. Over the past decade, Nigeria's debt-to-GDP ratio has nearly tripled by 2.87 times its 2015 level, outpacing Sub-Saharan Africa's 1.8 times average and the 1.6 times average for emerging markets. Despite these pressures, revenue performance has strengthened markedly in recent years, with total revenue by 2024 nearly four times 2019 levels, while tax collections grew even faster, reaching more than five times 2019 levels by 2025.
Recent Tax Revenue Growth and Sector Contributions
Between 2023 and 2025, Nigeria generated N62.3 trillion in tax revenues, with the non-oil sector contributing over 73%, amounting to N45.48 trillion, compared to just 27% from oil. Tax revenues nearly tripled within three years, rising from N10.18 trillion in 2022 to N28.29 trillion in 2025. In 2025 alone, tax collections increased by 30%, with non-oil taxes accounting for nearly 84% of the growth, while oil taxes contributed less than 15%.
Drivers of Revenue Surge and Fiscal Reforms
The report attributes the revenue surge to a mix of structural reforms, including the increase in Value Added Tax (VAT) from 5% to 7.5% in 2022, alongside improved tax administration and new fiscal policies. These measures have significantly broadened the tax base and reduced reliance on volatile oil earnings. Further gains are emerging from reforms in the oil and gas sector, such as Executive Order 9, which centralised revenue collection and led to oil and gas royalty remittances increasing by over N200 billion in February 2026 alone.
Debt Concerns and Fiscal Outlook
However, the report warns that fiscal gains are tempered by rising debt obligations. Nigeria's public debt has expanded to 14.4 times its 2013 level, while yearly debt service costs have surged to nearly 15 times pre-crisis levels. External debt, when measured in naira, has ballooned to 51.2 times its 2013 value, largely due to currency depreciation, with dollar terms being 5.2 times higher. While debt levels remain within sustainable thresholds, weak returns on borrowed funds pose a significant risk to long-term fiscal stability.
Future Implications and Citizen Expectations
On fiscal outlook growth, the report states that Nigeria's transition to a tax-driven fiscal state marks a critical turning point, reducing vulnerability to external shocks and improving revenue resilience. It stresses that without disciplined spending and productive investment, the benefits of increased revenues could be undermined. With taxes now forming the bulk of public revenues, citizens are expected to demand greater accountability across all levels of government, particularly in the management of both earned revenues and rising public debt. Nigeria's fiscal outlook will depend on the government's ability to convert growing revenues into tangible improvements in infrastructure, productivity, and living standards, while sustaining reforms that have driven the diversification of its revenue base.
