GDP and IGR are two common terms used when discussing the Nigerian economy, state finances and government performance. They are often mentioned in news reports, budget analysis, political debates and state rankings.

However, many people wrongly use them as if they mean the same thing. They do not.

GDP measures the value of goods and services produced in an economy. IGR measures the revenue a government raises within its own area, excluding federal allocations. A state can have strong economic activity but still collect low IGR. Another state may not have the largest economy but may collect more revenue because of better tax systems, a larger formal sector or stronger revenue administration.

This article explains the difference between GDP and IGR in Nigeria, why both matter, and why readers should be careful when comparing Nigerian states by economic size or revenue.

Quick Summary

• GDP means Gross Domestic Product. It measures the monetary value of goods and services produced within an economy.
• IGR means Internally Generated Revenue. It is money a state raises from taxes, licences, fees and other internal sources.
• GDP measures economic output, while IGR measures government revenue collection.
• Nigerian state IGR data is regularly published by the National Bureau of Statistics.
• Recent official state-level GDP data is limited. NBS has published partial state GDP data for selected states, especially the 2013–2017 series.
• A high-GDP state does not automatically have high IGR.
• Most Nigerian states still depend heavily on FAAC allocations from the Federation Account.

What Is GDP?

GDP means Gross Domestic Product. It is the total monetary value of final goods and services produced within a country, state or region over a specific period.

For example, if factories produce goods, farmers sell crops, banks provide services, hospitals treat patients, schools collect fees, transport companies move passengers and real estate developers build houses, the value of those activities can contribute to GDP.

In simple terms, GDP helps answer this question:

How much economic activity happened in this place during a period?

Nigeria’s national GDP is reported regularly by the National Bureau of Statistics through its GDP reports and methodology notes. The NBS GDP methodology page explains how GDP compilation is carried out using surveys, administrative records and internationally recognised statistical methods.

GDP can be measured at different levels:

• National GDP
• Regional GDP
• State GDP
• Sector GDP
• Real GDP
• Nominal GDP

For most ordinary readers, the most important thing to remember is that GDP is about production and economic output, not government cash in the bank.

What Is IGR?

IGR means Internally Generated Revenue. It refers to the money a government raises from sources within its own jurisdiction.

For Nigerian states, IGR is revenue generated internally by the state and the FCT. It does not include money received from the Federation Account, commonly called FAAC allocation.

According to the NBS Internally Generated Revenue at State Level 2023 report, state IGR is grouped into two broad categories:

1. Taxes
2. Ministries, Departments and Agencies revenue

Taxes under IGR include PAYE, Direct Assessment, Road taxes, Stamp duties, Capital gains tax, Withholding taxes, Other taxes and local government revenue where reported.

MDA revenue refers to money generated by government ministries, departments and agencies through fees, charges, licences and other non-tax sources.

In simple terms, IGR helps answer this question:

How much money did the state government raise by itself?

Simple Difference Between GDP and IGR

The most important difference is this:

GDP belongs to the wider economy. IGR belongs to the government’s revenue system.

A state may have many businesses, farms, factories and markets, but if much of that activity is informal or poorly captured by tax authorities, its IGR may still be low.

Why GDP and IGR Are Often Confused

GDP and IGR are often confused because both are used to describe economic performance.

When people hear that a state has a large GDP, they may assume the state government has a lot of money to spend. That is not always true.

GDP reflects the value of economic activities within the state. But the state government can only spend what it receives through IGR, FAAC allocations, VAT share, grants, loans and other public revenue sources.

For example, an oil-producing state may have large economic output because of petroleum-related activity. But if a significant part of public revenue comes through FAAC rather than locally collected taxes, the state may still depend heavily on federal allocations.

This is why IGR is useful for understanding a state’s fiscal strength, while GDP is better for understanding the size and structure of the economy.

What Counts as IGR in Nigerian States?

State IGR comes from different sources. The major ones include:

The NBS 2023 IGR report shows that PAYE was the largest tax component in 2023, recording ₦1.24 trillion and accounting for 63.83% of total taxes collected.

This explains why states with many formal workers and companies tend to collect more IGR. PAYE is easier to collect from formal salaries than taxes from informal businesses.

How Nigerian State IGR Data Is Collected

State IGR data is not guessed. It is compiled from official state revenue records.

The NBS methodology note on state IGR data explains that state IGR data is computed by the National Bureau of Statistics and the Joint Tax Board from official records and submissions by the 36 State Boards of Internal Revenue. The submissions are then validated and authenticated by the Joint Tax Board.

This process is important because it gives IGR data a clearer official basis than many online state wealth rankings.

However, users should still understand that quality and completeness can vary, especially where some revenue categories are underreported or inconsistently captured across states.

Recent IGR Figures in Nigeria

The NBS 2022 IGR report showed that the 36 states and the FCT generated about ₦1.93 trillion as IGR in 2022.

In 2023, the NBS 2023 IGR report showed that total IGR increased to ₦2.43 trillion. This represented a 26.03% growth from the previous year.

For 2023, the top three IGR performers were:

The lowest three in 2023 were:

For 2024, Punch reported the NBS 2024 IGR release, stating that the 36 states and FCT generated about ₦3.6 trillion in IGR. The report listed Lagos, Rivers, FCT, Ogun and Enugu as the top five IGR generators.

According to the report, Lagos generated about ₦1.26 trillion in 2024, making it the clear national leader.

Why Lagos Generates More IGR Than Other States

Lagos has consistently led Nigerian states in IGR because of its economic structure.

Several factors help Lagos collect more revenue:

• Large concentration of companies
• High number of formal-sector workers
• Stronger tax administration systems
• High commercial activity
• Ports, trade and logistics
• Real estate and construction activity
• Banking, telecoms and professional services
• Large consumer market
• Better digital revenue collection than many states

This does not mean every resident of Lagos is rich. It means the state has a large and formal economic base that can be taxed more effectively than many other states.

A state with many informal businesses may have active markets and hardworking citizens, but if economic activities are not properly documented or taxed, its IGR will remain limited.

Does High GDP Mean High IGR?

Not always.

A high GDP means a state has significant economic activity. But IGR depends on how much of that activity the government can legally and efficiently collect as revenue.

Several things affect IGR:

• Size of the formal economy
• Number of salaried workers
• Taxpayer database quality
• Ease of tax payment
• Business registration levels
• Enforcement capacity
• Public trust in government
• Revenue leakages
• State tax laws and administration

This is why GDP and IGR should not be used interchangeably.

A state may have strong agricultural production, mining activity, oil production or trade, but if much of that activity is informal or if the tax system is weak, IGR may not reflect the full size of the economy.

Why State GDP Data in Nigeria Needs Caution

One major problem in comparing Nigerian states is that recent comprehensive state-level GDP data is limited.

The NBS States Nominal Gross Domestic Product 2013–2017 Phase II report covered 22 states for which data was available. In 2017, the nominal GDP for those 22 states stood at ₦63.8 trillion, representing about 56% of Nigeria’s nominal GDP that year.

The same NBS report stated that the FCT had the highest GDP among the 22 states covered, at ₦10.6 trillion, followed by Akwa Ibom and Rivers.

This is useful, but it is not a complete current GDP ranking for all 36 states and the FCT.

That is why recent online rankings of Nigerian states by GDP should be treated carefully. Many of them rely on estimates, projections or secondary analyses rather than a regularly updated official NBS state GDP series for every state.

GDP vs IGR: Which One Should Citizens Care About?

Citizens should care about both, but for different reasons.

GDP matters because it shows the strength and structure of the economy. If a state has growing production, more businesses, more jobs and stronger sectors, that can improve opportunities for residents.

IGR matters because it affects the state government’s ability to provide services without depending completely on monthly federal allocations.

A state with rising IGR may have more capacity to fund:

• Roads
• Schools
• Hospitals
• Waste management
• Water projects
• Transport systems
• Salary payments
• Local infrastructure
• Economic development programmes

However, high IGR alone does not guarantee good governance. The money must still be managed transparently and spent wisely.

Why Many Nigerian States Depend on FAAC

Most Nigerian states still rely heavily on FAAC allocations. FAAC refers to revenue shared from the Federation Account, including statutory allocations and other federally distributed revenues.

This dependence matters because when oil revenue falls, exchange rates shift or federal receipts decline, many states can struggle to pay salaries or fund projects.

Higher IGR can make a state more financially resilient. But increasing IGR should not simply mean overtaxing poor residents or small businesses. A better approach is to expand the economy, improve collection systems, reduce leakages and formalise more businesses gradually.

Common Mistakes People Make About GDP and IGR

Mistake 1: Treating IGR as the size of a state economy

IGR is not the same as GDP. IGR is public revenue collected by the government. GDP is the value of economic production.

Mistake 2: Saying the richest state is always the highest IGR state

A state may be economically important but still collect less IGR than expected because of weak revenue systems or heavy reliance on federal allocation.

Mistake 3: Using old GDP figures as current rankings

Because official state GDP data is not regularly updated for all states, old figures should not be presented as current rankings.

Mistake 4: Calling FAAC allocation IGR

FAAC is not IGR. IGR is generated internally by the state. FAAC is shared from the Federation Account.

Mistake 5: Ignoring inflation

When IGR grows in nominal naira terms, it does not automatically mean the state is financially stronger in real terms. Inflation can reduce the purchasing power of the money collected.

Practical Example

Imagine State A has a large farming economy, many markets and strong trading activity, but most businesses are informal and do not pay regular taxes. Its GDP may be significant, but its IGR may be low.

Now imagine State B has many companies, banks, formal workers and digital tax systems. Even if it is smaller in land area, it may collect more IGR because its tax base is easier to identify and manage.

This is why GDP and IGR must be interpreted carefully.

Data Limitations to Remember

When reading any article about Nigerian states by GDP or IGR, keep these limitations in mind:

• Recent official state GDP data for all 36 states and FCT is not regularly available.
• IGR figures are official, but they depend on state submissions and reporting quality.
• Some state revenue figures online combine IGR, FAAC, grants and loans without explaining the difference.
• Nominal naira values do not adjust for inflation.
• Estimated GDP rankings should be clearly labelled as estimates.
• A state’s revenue does not automatically prove good service delivery.

These limitations are important for students, researchers, journalists and citizens who want to use the data responsibly.

How We Prepared This Article

This article was prepared using official and reputable public sources, especially National Bureau of Statistics reports on state IGR and state GDP. The article separates official facts from estimates and avoids presenting incomplete state GDP data as a current full ranking.

The purpose is to help readers understand the difference between economic output and government revenue, and to avoid common errors in interpreting Nigerian state finance data.

Sources and References

• NBS Internally Generated Revenue at State Level, 2023
• NBS Internally Generated Revenue at State Level, 2022
• NBS States Nominal Gross Domestic Product, 2013–2017 Phase II
• NBS Internally Generated Revenue methodology note
• Punch report on NBS 2024 state IGR figures
• NBS GDP methodology

Frequently Asked Questions

What is the difference between GDP and IGR?

GDP measures the value of goods and services produced in an economy. IGR measures the money a state government raises internally from taxes, fees, licences and other local sources.

Is IGR the same as state revenue?

No. IGR is only one part of state revenue. Total state revenue may also include FAAC allocations, VAT share, grants, loans and other receipts.

Does high GDP mean a state is rich?

High GDP means a state has significant economic activity. It does not automatically mean the government has enough money or that residents are wealthy.

Does high IGR mean a state has a bigger economy?

Not always. High IGR may reflect a stronger tax base, better collection systems or more formal employment. It is not a direct measure of total economic output.

Which Nigerian state has the highest IGR?

Lagos State consistently records the highest IGR in Nigeria. In 2023, NBS reported Lagos at ₦815.86 billion, and 2024 reports based on NBS figures placed Lagos above ₦1.2 trillion.

Why is Lagos IGR so high?

Lagos has many companies, formal workers, commercial activities, ports, financial institutions, real estate activity and stronger revenue collection systems.

Are Nigerian state GDP rankings official?

Only some historical state GDP data has been officially published by NBS. Recent full GDP rankings for all 36 states and the FCT should be treated carefully unless they clearly show an official source.

Why do states depend on FAAC?

Many states do not generate enough IGR to fund their budgets. They depend on FAAC allocations shared from the Federation Account.

Can a state increase IGR without raising taxes?

Yes. A state can improve IGR by reducing leakages, expanding the taxpayer database, simplifying payment systems, formalising businesses and growing the economy.

Where can I find official state IGR data?

Official state IGR reports can be found in the National Bureau of Statistics elibrary through the NBS website.

Conclusion

GDP and IGR are both important, but they measure different things. GDP shows the size and output of an economy. IGR shows how much revenue a state government collects internally.

For Nigerian states, this difference matters because economic activity does not automatically become public revenue. A state can have industries, farms, markets or oil activity and still depend heavily on federal allocation if its internal revenue system is weak.

When comparing states, readers should avoid unsupported rankings and always check whether the data comes from NBS, audited state reports or another credible source. That is the safest way to understand Nigeria’s state economies without confusing production, revenue and government spending.