Chapter One — 1.1 Background to the Study

In recent years, Presumptive Tax Assessment has emerged as a critical factor shaping internally generated revenue across organizations operating in and around the Nigerian Oil and Gas Sector. As institutions grapple with the pressures of globalization, regulatory reform, and shifting stakeholder expectations, understanding how presumptive tax assessment relates to internally generated revenue has become an important area of both scholarly and practical concern.

the Nigerian Oil and Gas Sector presents a useful setting for examining this relationship precisely because the conditions there — structural, regulatory, and behavioural — differ from those typically assumed in the broader literature, most of which draws on evidence from more developed economies.

1.2 Statement of the Problem

While presumptive tax assessment is widely discussed in policy and industry circles, empirical evidence on its actual effect on internally generated revenue within the Nigerian Oil and Gas Sector remains sparse and, in places, contradictory. This lack of localized, rigorous evidence makes it difficult for decision-makers to know with confidence whether current approaches to presumptive tax assessment are helping or hindering internally generated revenue — a gap this study sets out to close.

1.3 Objectives of the Study

1. To examine the effect of Presumptive Tax Assessment on internally generated revenue in the Nigerian Oil and Gas Sector.
2. To assess the extent to which presumptive tax assessment influences internally generated revenue within the study area.
3. To identify the challenges associated with presumptive tax assessment in relation to internally generated revenue.
4. To recommend strategies for optimizing presumptive tax assessment in order to improve internally generated revenue.

1.4 Research Questions

1. What is the effect of presumptive tax assessment on internally generated revenue in the Nigerian Oil and Gas Sector?
2. To what extent does presumptive tax assessment influence internally generated revenue within the study area?
3. What challenges are associated with presumptive tax assessment in relation to internally generated revenue?
4. What strategies can be adopted to optimize presumptive tax assessment in order to improve internally generated revenue?

1.5 Significance of the Study

Beyond its academic contribution to the field of taxation, this study has practical value for management teams within the Nigerian Oil and Gas Sector seeking to understand how presumptive tax assessment translates into measurable outcomes around internally generated revenue. It is equally useful to students and future researchers looking for a localized empirical reference on this relationship.

1.6 Scope of the Study

In terms of scope, this study confines itself to the Nigerian Oil and Gas Sector, focusing specifically on how presumptive tax assessment relates to internally generated revenue within that setting. Findings are interpreted within these boundaries rather than as universal claims applicable to every organization or market.