Project – Effect of Tax Compliance on the Revenue Generation of State Governments: A Case Study of Lagos State Internal Revenue Service.

CHAPTER ONE

INTRODUCTION

1.1 Background to the Study

Taxation is one of the major instruments through which governments mobilise financial resources to provide public goods and services, maintain infrastructure, promote economic development, and fulfil their constitutional responsibilities. For state governments, internally generated revenue is particularly important because it helps finance public expenditure without excessive dependence on allocations from the Federation Account, borrowing, or other external sources. Taxes collected from individuals, employees, businesses, and other taxable entities provide a regular source of funding for essential services such as education, healthcare, transportation, sanitation, and public administration. However, the capacity of a government to obtain adequate revenue from taxation depends not only on the tax rates established by law but also on the willingness and ability of taxpayers to comply with their tax obligations. Alm (2019) explains that taxation is influenced by economic incentives, institutional arrangements, and taxpayers’ behavioural responses, while the Organisation for Economic Co-operation and Development (OECD, 2023) identifies effective domestic revenue mobilisation as an important element of sustainable public finance. Consequently, tax compliance is a significant factor in determining whether a state government can convert its legally established tax system into actual revenue for development.

Tax compliance generally refers to the extent to which taxpayers fulfil their obligations under applicable tax laws and regulations. Such obligations may include registering with the relevant tax authority, submitting accurate tax returns, declaring taxable income, maintaining appropriate financial records, and paying assessed taxes within the prescribed period. Non-compliance occurs when taxpayers fail to meet these obligations, whether through deliberate tax evasion, underreporting of income, late payment, inaccurate declarations, or failure to register with the tax authority. Kirchler (2007) explains that tax compliance cannot be understood exclusively through financial penalties because taxpayers’ decisions are also influenced by trust, perceptions of fairness, institutional legitimacy, and their relationship with tax authorities. Similarly, Alm (2019) observes that compliance behaviour reflects the interaction between enforcement mechanisms and the broader economic and institutional environment. This implies that a state government may possess an adequate legal framework for taxation and still experience revenue shortfalls when taxpayers do not fully comply. Therefore, examining tax compliance is essential for understanding the factors that influence the actual revenue obtained by state governments.

The relationship between tax compliance and revenue generation is especially important in developing economies, where governments often face competing demands for public expenditure alongside limitations in their revenue bases. When taxpayers fulfil their obligations accurately and promptly, the government is more likely to collect the revenue legally due to it, improve fiscal planning, and reduce the gap between expected and actual tax receipts. Conversely, persistent non-compliance can reduce government revenue, increase the cost of tax administration, encourage unfair competition between compliant and non-compliant businesses, and shift a greater tax burden onto those who regularly pay. The International Monetary Fund (IMF, 2015) identifies domestic revenue mobilisation as a critical issue for developing countries seeking to finance public services and achieve sustainable development. In addition, the OECD (2023) emphasises the importance of strengthening tax administration, improving compliance, and widening the effective tax base to support public revenue mobilisation. These concerns are relevant to Nigerian state governments because their ability to deliver public services depends partly on how effectively they identify taxable persons and activities, assess tax liabilities, and ensure that amounts due are collected.

In Nigeria, internally generated revenue provides state governments with an important means of strengthening fiscal independence and responding to the needs of their residents. Although states receive statutory allocations from the Federation Account, differences in economic activity, administrative capacity, tax bases, and collection practices influence their ability to generate revenue internally. The National Bureau of Statistics (NBS, 2024), through its reports on state-level internally generated revenue, provides an important basis for examining the revenue performance of individual states and comparing their capacity to mobilise domestic resources. The Nigerian tax administration framework also establishes legal responsibilities for tax assessment, collection, enforcement, and the treatment of taxpayers. Nevertheless, the existence of tax laws does not automatically guarantee compliance, since actual outcomes depend on taxpayer awareness, accessibility of payment systems, administrative efficiency, the credibility of tax assessments, and the effectiveness of enforcement. Kirchler (2007) notes that taxpayers’ perceptions of fairness and trust in tax institutions influence their willingness to comply. Accordingly, understanding the effect of tax compliance on revenue generation requires attention to both the formal tax system and the practical circumstances in which taxpayers meet their obligations.

Lagos State provides a particularly relevant setting for investigating the relationship between tax compliance and revenue generation because of its large population, substantial commercial activity, concentration of formal and informal businesses, and extensive demand for public infrastructure and social services. These characteristics create considerable opportunities for generating tax revenue but also present administrative challenges in identifying taxable persons, determining taxable income, maintaining reliable records, and ensuring compliance across different economic sectors. The Lagos State Internal Revenue Service (LIRS) is the state agency responsible for administering relevant state taxes and supporting the mobilisation of internally generated revenue within the applicable legal framework. The effectiveness of its activities depends partly on its ability to maintain taxpayer records, provide accessible tax services, communicate tax obligations, monitor compliance, and apply lawful enforcement measures. The OECD (2023) highlights the importance of effective tax administration and compliance management in improving domestic revenue mobilisation, while Alm (2019) demonstrates that the design of enforcement and taxpayer-facing institutions can influence compliance behaviour. In this context, Lagos State offers a useful case through which to examine whether compliance with tax obligations contributes to improved revenue generation and which compliance-related factors may be associated with revenue performance.

Tax compliance can be influenced by several factors, including taxpayer education, perceptions of tax fairness, the simplicity of tax procedures, the perceived quality of public services, the risk of detection, the level of penalties, and confidence in tax administration. Where taxpayers understand their obligations and consider tax assessments fair, they may be more willing to declare income and make payments voluntarily. However, complicated procedures, limited awareness, distrust of public institutions, weak enforcement, and opportunities for evasion may discourage compliance. Kirchler, Hoelzl, and Wahl (2008) distinguish between enforced compliance, which is encouraged through audits and penalties, and voluntary compliance, which is supported by trust and a cooperative relationship between taxpayers and tax authorities. Alm (2019) similarly argues that effective tax compliance policy requires more than punishment, as the motivations behind taxpayer behaviour are complex. For LIRS, this suggests that revenue outcomes may be influenced by a combination of enforcement, taxpayer education, administrative accessibility, and institutional credibility. Assessing tax compliance in Lagos State therefore requires consideration of how these factors affect taxpayers’ fulfilment of their obligations and, in turn, the revenue available to the state government.

Despite the importance of tax compliance, the existence of a large economic base does not necessarily translate into the collection of all revenue legally due to a government. A state may have substantial taxable economic activity but still experience revenue losses when taxable income is concealed, tax returns are inaccurate, payments are delayed, or some taxpayers remain outside the formal tax system. It is therefore necessary to distinguish between the potential revenue that could be collected under existing tax laws and the revenue actually received by the tax authority. The IMF (2015) explains that strengthening domestic revenue mobilisation requires attention to the design and implementation of tax systems, while the OECD (2023) stresses the importance of improving administrative capacity and compliance management. In Lagos State, a systematic examination of tax compliance and revenue generation can help clarify whether improved compliance is associated with stronger revenue performance and identify areas where tax administration may be strengthened. This study, therefore, investigates the effect of tax compliance on the revenue generation of state governments, using the Lagos State Internal Revenue Service as its case study. It focuses on the relationship between taxpayers’ fulfilment of their obligations and the capacity of the state to mobilise revenue for public expenditure and development.

1.2 Statement of the Problem

Revenue generation remains a major concern for state governments in Nigeria because adequate financial resources are necessary for the provision of public services, infrastructure development, and the implementation of government policies. Although taxation provides an important source of internally generated revenue, the ability of a state to collect the taxes legally due to it depends significantly on taxpayers’ compliance with their obligations. When individuals and businesses fail to register, underdeclare their income, submit inaccurate tax returns, or delay tax payments, government revenue may fall below its potential level. This situation can constrain government expenditure and increase dependence on other sources of funding. Alm (2019) establishes that tax compliance is influenced by several economic, institutional, and behavioural factors, while the OECD (2023) emphasises that effective compliance management is necessary for tax administrations to mobilise revenue successfully. The problem, therefore, is not simply whether tax laws exist, but whether taxpayers comply sufficiently with those laws to enable state governments to realise the revenue required for governance and development.

In Lagos State, the size and diversity of economic activities provide a considerable potential tax base, but identifying taxable persons, assessing their liabilities accurately, and ensuring timely payment remain important responsibilities for the Lagos State Internal Revenue Service. Taxpayers may fail to comply because of inadequate knowledge of tax obligations, perceived unfairness in tax assessment, complicated payment procedures, distrust of tax authorities, or the belief that the likelihood of detection is low. These factors may contribute to underpayment, delayed remittance, inaccurate reporting, and the exclusion of some eligible taxpayers from the tax system. Kirchler (2007) explains that tax compliance is affected by taxpayers’ perceptions of fairness, trust, and the legitimacy of tax institutions, while Kirchler et al. (2008) demonstrate the importance of both enforcement and voluntary cooperation in achieving compliance. Consequently, the existence of a strong economic base in Lagos State does not, by itself, guarantee that all potential tax revenue will be collected. The extent to which taxpayers’ compliance behaviour affects revenue generation by LIRS therefore requires systematic examination.

Previous studies have examined aspects of taxation and revenue generation in Lagos State, including tax administration, tax reforms, taxpayer identification, electronic tax systems, and tax compliance. Enahoro and Jayeola (2012) investigated tax administration and revenue generation in Lagos State and reported that administrative effectiveness was relevant to revenue performance. Asaolu et al. (2015) also examined tax reforms and revenue generation in Lagos State, identifying a positive relationship between reforms and the state’s revenue structure. More directly, Isimoya (2022) investigated tax compliance and revenue generation in Lagos State and reported a statistically significant relationship between tax compliance and revenue generation. These studies provide useful foundations for the present research, but their different emphases make it necessary to examine tax compliance specifically in relation to revenue generation through the Lagos State Internal Revenue Service. The central concern is to establish how the fulfilment of tax obligations relates to the revenue collected and to consider the practical factors that may strengthen or weaken this relationship.

The persistence of tax compliance concerns raises an important question about the extent to which improving taxpayer compliance can enhance the revenue-generation capacity of Lagos State. Although tax audits, electronic filing, taxpayer education, improved identification systems, and enforcement measures may help strengthen compliance, their contribution to actual revenue outcomes needs to be understood within the operations of the relevant state tax authority. Without a clear understanding of this relationship, revenue-enhancement policies may concentrate on expanding tax rates or introducing new collection measures without adequately addressing the reasons taxpayers fail to comply. Alm (2019) argues that effective compliance strategies must consider both deterrence and the factors that motivate taxpayers to meet their obligations, while the OECD (2023) highlights the importance of making compliance easier and improving tax administration. Against this background, this study examines the effect of tax compliance on the revenue generation of state governments, using the Lagos State Internal Revenue Service as a case study. It seeks to provide evidence that may assist tax administrators and policymakers in identifying measures for improving compliance and strengthening revenue mobilisation.

1.3 Aim and Objectives of the Study

The main aim of this study is to examine the effect of tax compliance on the revenue generation of state governments, using the Lagos State Internal Revenue Service as a case study.

The specific objectives are to:

1. Examine the effect of timely payment of taxes on revenue generation by the Lagos State Internal Revenue Service.

2. Determine the effect of accurate tax returns and income declaration on revenue generation in Lagos State.

3. Assess the influence of tax audits and enforcement measures on taxpayers’ compliance and revenue generation by LIRS.

4. Examine the effect of taxpayer awareness and knowledge of tax obligations on revenue generation in Lagos State.

1.4 Research Questions

The following research questions will guide the study:

1. What is the effect of timely payment of taxes on revenue generation by the Lagos State Internal Revenue Service?

2. To what extent do accurate tax returns and income declaration affect revenue generation in Lagos State?

3. How do tax audits and enforcement measures influence taxpayers’ compliance and revenue generation by LIRS?

4. What is the effect of taxpayer awareness and knowledge of tax obligations on revenue generation in Lagos State?

1.5 Research Hypothesis

The following null hypothesis will be tested in the study:

H₀: Tax compliance has no statistically significant effect on revenue generation by the Lagos State Internal Revenue Service.

1.6 Significance of the Study

This study is expected to be beneficial to the Lagos State Government, the Lagos State Internal Revenue Service, taxpayers, policymakers, researchers, and students of accounting, taxation, economics, and public administration.

Lagos State Government: The findings may provide useful information on the relationship between taxpayers’ compliance and revenue generation. This could assist the government in developing policies aimed at improving internally generated revenue and supporting the financing of public infrastructure and social services.

Lagos State Internal Revenue Service: The study may help LIRS identify compliance-related issues affecting revenue collection. Its findings may support improvements in taxpayer education, tax assessment, payment procedures, monitoring, audit practices, and lawful enforcement.

Taxpayers: The study may increase awareness of the importance of fulfilling tax obligations. It may also highlight the need for accessible tax procedures, transparent administration, fair assessment, and effective communication between taxpayers and the tax authority.

Policymakers: The research may provide information to support the development of tax policies that encourage voluntary compliance while maintaining appropriate enforcement. Such policies may help reduce avoidable revenue losses and improve the effectiveness of tax administration.

Researchers and students: The study may contribute to the literature on tax compliance and public revenue generation, particularly within the Nigerian state-government context. It may also serve as a reference for future studies on taxation, fiscal administration, and internally generated revenue.

1.7 Scope of the Study

The study focuses on the effect of tax compliance on revenue generation by state governments, with particular reference to the Lagos State Internal Revenue Service. Its geographical scope is Lagos State, Nigeria, while its institutional focus is LIRS and its role in administering relevant state taxes.

The content scope covers four principal dimensions of tax compliance: timely payment of taxes, accurate tax returns and income declaration, tax audits and enforcement measures, and taxpayer awareness and knowledge of tax obligations. Revenue generation constitutes the dependent variable, while the identified compliance dimensions provide the principal areas through which the relationship will be examined.

The study is concerned with the relationship between tax compliance and revenue generation rather than every possible source of internally generated revenue. It will therefore distinguish tax-related revenue from other sources of state revenue where the available evidence permits. The study period should be specified in the research methodology according to the availability and reliability of relevant records.

1.8 Limitations of the Study

The study may encounter limitations relating to access to tax records, the availability of detailed revenue data, and the difficulty of obtaining information on non-compliant taxpayers. Some tax-related records may be confidential or restricted, which could limit the level of detail available for analysis.

Another possible limitation is the difficulty of separating the effect of tax compliance from other factors that influence revenue generation, such as economic growth, inflation, changes in tax legislation, administrative reforms, and changes in the number of registered taxpayers. Revenue increases cannot automatically be attributed to improved compliance without considering these factors.

The study may also be limited by the period covered by available data and differences in how tax compliance and revenue performance are measured. These limitations will be addressed by using credible sources, clearly defining the variables, acknowledging gaps in the available evidence, and avoiding conclusions that extend beyond the findings.

1.9 Operational Definition of Terms

Tax Compliance: The extent to which individuals and businesses fulfil their tax obligations in accordance with applicable tax laws, including registration, income declaration, filing of returns, and timely payment.

Tax Revenue: Money collected by the government through taxes legally imposed on individuals, employees, businesses, and other taxable entities.

Revenue Generation: The process through which the government mobilises financial resources to finance public expenditure and fulfil its responsibilities. In this study, the term primarily refers to tax revenue collected through the relevant state tax administration system.

Taxpayer: An individual or legal entity that is required by applicable tax laws to register, declare taxable income, file returns, or pay taxes.

Tax Evasion: An unlawful act through which a taxpayer deliberately avoids or reduces tax liability, such as by concealing income, submitting false information, or failing to declare taxable transactions.

Tax Audit: An examination of a taxpayer’s records, declarations, and financial information to determine whether the taxpayer has complied with applicable tax laws and reported tax liabilities accurately.

Tax Enforcement: Lawful measures used by tax authorities to encourage compliance and address non-compliance, including assessments, audits, penalties, and recovery procedures where legally permitted.

Taxpayer Awareness: The level of knowledge and understanding taxpayers possess concerning their tax obligations, filing requirements, payment procedures, and the consequences of non-compliance.

Internally Generated Revenue (IGR): Revenue generated by a state government from sources within its jurisdiction, including taxes and other legally recognised non-tax revenue sources.

Lagos State Internal Revenue Service (LIRS): The state revenue administration agency responsible for administering relevant taxes within Lagos State under the applicable legal framework.

1.10 Organisation of the Study

The study is organised into five chapters. Chapter One presents the introduction, background to the study, statement of the problem, aim and objectives, research questions, research hypothesis, significance, scope, limitations, operational definitions, and organisation of the study.

Chapter Two reviews relevant conceptual, theoretical, and empirical literature on tax compliance and revenue generation. It also discusses the theories underpinning the study and identifies gaps in existing research.

Chapter Three explains the research methodology, including the research design, study population, sampling procedure where applicable, sources of data, research instrument where applicable, methods of data collection, and techniques of data analysis.

Chapter Four presents, analyses, and discusses the findings in relation to the research questions and hypothesis.

Chapter Five summarises the findings, draws conclusions, presents recommendations, discusses the implications of the study, and suggests areas for further research.

Project – Effect of Tax Compliance on the Revenue Generation of State Governments: A Case Study of Lagos State Internal Revenue Service.