Act, Regulation, S.I., Gazette, Section and Schedule: How to Read Nigerian Tax Laws Correctly

When a Nigerian tax rule is announced, the first question should not be how much tax you must pay. It should be: where exactly does the law impose that obligation? An Act, a Regulation, a Statutory Instrument (S.I.), a Gazette, a Section and a Schedule each do a different job, and confusing them is how taxpayers misread their obligations and advisers end up citing the wrong authority.

The question has become more pressing since Nigeria's 2025 tax reform. Four new statutes now anchor the system: the Nigeria Tax Act, 2025, the Nigeria Tax Administration Act, 2025, the Nigeria Revenue Service (Establishment) Act, 2025 and the Joint Revenue Board (Establishment) Act, 2025. All were assented to in June 2025 and took effect on 1 January 2026. Beneath them, a growing body of regulations, orders, guidelines and notices is being issued. A reader who cannot tell an Act from a Regulation, or a Section from a Schedule, will struggle to know which of these documents actually binds them.

This article uses the Nigeria Tax Act, 2025 and the Nigeria Presumptive Tax Regulations, 2026 as a worked example. The governing principle is simple: identify the law, locate the provision, confirm the authority behind any subsidiary rules, and verify the detail before deciding what a taxpayer must do.

Where does Nigerian tax law come from?

Nigerian tax law sits within a clear hierarchy of authority, and every reference should be traceable up that hierarchy.

1. The Constitution. Section 1(1) and (3) of the Constitution of the Federal Republic of Nigeria 1999 (as amended) make it supreme; any law inconsistent with it is void to the extent of the inconsistency. Section 4 vests federal legislative power in the National Assembly, and Item 59 of the Exclusive Legislative List reserves the taxation of incomes, profits and capital gains to that body. Section 59(1)(b) treats a bill for the imposition of, or increase in, any tax, duty or fee as a money bill, subject to a special procedure.
2. Acts of the National Assembly. Primary legislation. Section 2(1) of the Interpretation Act (Cap. I23, Laws of the Federation of Nigeria 2004) provides that an Act is passed when the President assents to the Bill; it commences on the date it provides for, or on the date of passing if it is silent.
3. Subsidiary legislation. Regulations, rules, orders and similar instruments made under a power conferred by an Act. Section 37(1) of the Interpretation Act defines a "subsidiary instrument" as any order, rules, regulations, rules of court or bye-laws made under an enactment, and defines "enactment" to include any provision of an Act or subsidiary instrument.
4. Administrative guidance. Circulars, public notices and practice notes issued by the Nigeria Revenue Service or a State Internal Revenue Service. These explain the administrator's position but do not themselves create legal obligations.

Two judicial principles complete the picture. First, tax may only be imposed by clear words of statute. The Nigerian courts have long followed the rule in Cape Brandy Syndicate v. Inland Revenue Commissioners [1921] 1 KB 64 that in a taxing statute one looks only at what is clearly said, and in A. O. Williams v. Lagos State Development and Property Corporation (1978) 3 SC 11 the Supreme Court affirmed that no pecuniary burden may be imposed on the subject except under clear legal authority. Second, subsidiary legislation lives and dies by its enabling Act. A regulation that exceeds or contradicts the Act under which it is made is ultra vires and void to that extent (see Governor of Oyo State v. Folayan (1995) 8 NWLR (Pt. 413) 292).

What is the difference between an Act and a Regulation?

An Act is legislation passed by the National Assembly and assented to by the President under Section 58 of the Constitution. It establishes the principal legal framework: who is taxable, on what, at what rate, with what exemptions, and under whose administration. The Nigeria Tax Act, 2025 is Act No. 7 of 2025, published in Federal Republic of Nigeria Official Gazette No. 117, Vol. 112 of 26 June 2025, with a stated commencement date of 1 January 2026.

A Regulation is subsidiary legislation. It supplies the detailed rules needed to implement an Act, but only where, and only to the extent that, the Act authorises it. Section 194 of the Nigeria Tax Act, 2025 confers a general power on the Minister to make regulations for giving effect to the Act, and specific provisions delegate further rule-making powers on particular subjects.

Section 29 is one of those provisions. It provides that, notwithstanding the ordinary rules of Chapter Two, where a person's income cannot practically be ascertained, or records are not kept in a manner that allows proper assessment, that person may be assessed under a presumptive tax regime on such terms and conditions as may be prescribed by the Minister, on the advice of the Joint Revenue Board. The Nigeria Presumptive Tax Regulations, 2026 are the Minister's exercise of that delegated power.

The test to apply: a Regulation can fill in detail; it cannot create a charge, a taxable person or a penalty that the parent Act does not contemplate. Where a regulation appears to go further than its enabling section, the enabling section is the safer guide and the point should be flagged for legal review.

Two further rules from the Interpretation Act are useful here. Section 10(3) allows a subsidiary instrument to be made after an Act is passed but before it commences, provided the instrument does not take effect before the Act itself comes into force. Section 12(1)(b) confirms that a power to make an instrument includes the power to vary and revoke it, which is why regulations can be amended without returning to the National Assembly.

What does S.I. mean?

S.I. stands for Statutory Instrument. It is the formal label given to a piece of subsidiary legislation when it is published, and the serial number distinguishes it from every other instrument made in the same year. A citation such as "S.I. No. 24 of 2026" tells you that the document is the twenty-fourth statutory instrument registered in 2026. It tells you nothing about the content, the enabling Act or the obligations created.

A Statutory Instrument may contain regulations, rules, orders, notices or directions, and may be made by a Minister, a statutory body or another official, depending on who the enabling Act empowers. When you pick up an S.I., check the following before reading anything else:

1. The full title and citation clause (usually Regulation 1).
2. The enabling Act and the specific section under which it is made, normally stated in the preamble.
3. The commencement provision, which may differ from the publication date.
4. Who signed it and in what capacity.
5. Whether it contains Schedules, forms or lists that carry operative content.

What is a Gazette, and why should taxpayers care?

The Federal Republic of Nigeria Official Gazette is the official publication through which Acts, subsidiary legislation, appointments, proclamations and government notices are formally published. States maintain their own gazettes for state laws. The Gazette is not itself a law; it is the authoritative record in which the text of a law appears. It is also the document courts take judicial notice of under Section 122 of the Evidence Act, 2011, which is why practitioners cite Gazette numbers in formal opinions and in correspondence with tax authorities.

The practical importance is illustrated by the presumptive tax regime itself. The Nigeria Presumptive Tax Regulations, 2026 were signed by the Minister of Finance in March 2026, published in Official Gazette No. 85 of 13 May 2026, and expressed to commence on 1 January 2026, the same day the Nigeria Tax Act, 2025 came into force (see the summaries by Mondaq and Andersen Nigeria). Anyone who relied only on the publication date, or only on a newspaper report, would have misjudged the period the regime covers. The commencement clause, not the headline, settles the question.

Suppose you read an online article claiming that a new regulation imposes an obligation on small businesses. The article may be accurate. It is still not a substitute for the instrument. Where legal wording, publication details or effective dates matter, go to the Gazette text, and where the Gazette is unavailable, obtain the certified text from the Federal Ministry of Finance, the Nigeria Revenue Service or the relevant State Internal Revenue Service.

What is a Section, and what does Section 29 mean?

A Section is a numbered provision within an Act or other legislation. It is the basic unit of legal citation and directs the reader to one specific rule. Section 29 of the Nigeria Tax Act, 2025 is the presumptive taxation provision; Section 56 sets the companies income tax rates; Section 58 sets individual rates by reference to the Fourth Schedule; Section 201 is the general interpretation section that defines terms used throughout the Act.

References become more precise as you descend through the structure:

• Section 29 refers to the whole section.
• Section 29(1) refers to subsection (1) only.
• Section 29(1)(a) refers to paragraph (a) within subsection (1).
• Section 29(1)(a)(i) refers to sub-paragraph (i) within that paragraph.

These distinctions matter because the operative conditions, exceptions or cross-references usually sit in a particular subsection rather than in the opening words. Two technical rules from Section 3 of the Interpretation Act are worth remembering. Punctuation forms part of an enactment and may be used in construing it (Section 3(1)). A heading or marginal note does not form part of the enactment and is for reference only (Section 3(2)). The heading "Presumptive taxation" therefore helps you find Section 29; it cannot be used to widen or narrow what Section 29 actually says.

When an accountant or tax adviser cites a provision, the reference should be precise enough to take the reader directly to the rule relied upon. "Section 29" is a signpost. "Section 29(1) of the Nigeria Tax Act, 2025, read with Regulation 4 of the Nigeria Presumptive Tax Regulations, 2026" is an authority.

What is a Schedule, and when should you read it?

A Schedule is an annex to an Act or Regulation that carries detail too long or too tabular for the body of the text: rates, classifications, lists, forms, procedures, exemptions or transitional provisions. It is incorporated by a section in the main body, and once incorporated it has the same legal force as that section. As Lord Sterndale MR put it in Inland Revenue Commissioners v. Gittus [1920] 1 KB 563, a schedule is as much a part of the statute as any other part, and where the section and the schedule conflict, the section that introduces the schedule governs.

The Nigeria Tax Act, 2025 cannot be applied without its Schedules. Examples include:

• First Schedule: capital allowances, incorporated by Sections 18, 27, 39, 41 and 43.
• Third Schedule: interest deductibility, incorporated by Section 20(1)(a).
• Fourth Schedule: the individual income tax rate table, incorporated by Section 58.
• Fifth Schedule: settlements, trusts and estates, incorporated by Section 16.
• Fourteenth Schedule: allocation of the Development Levy, incorporated by Section 59(6).

Regulations carry Schedules too. Schedule 1 to the Nigeria Presumptive Tax Regulations, 2026 lists the categories of nano businesses that fall outside the regime, including roadside food vendors, newspaper vendors and similar petty traders. A reader who stops at the operative regulations and never opens Schedule 1 would miss the single most important exclusion in the instrument.

Practical rule: read the section and its Schedule together. A rate without its charging section tells you nothing about who pays; a charging section without its Schedule tells you nothing about how much.

How do these legal terms fit together?

Consider the full citation: Nigeria Presumptive Tax Regulations, 2026 (S.I. No. 24 of 2026), Official Gazette No. 85 of 13 May 2026, made under Section 29 of the Nigeria Tax Act, 2025 (Act No. 7 of 2025). Each element answers a different question.

• Act (Nigeria Tax Act, 2025): where does the power to tax, and the power to make rules, come from?
• Section (Section 29): which specific provision authorises a presumptive regime?
• Regulation (Nigeria Presumptive Tax Regulations, 2026): what are the detailed terms, rate, turnover bands, filing and payment?
• S.I. number (S.I. No. 24 of 2026): which instrument, among all made in 2026, is this?
• Gazette (Official Gazette No. 85, 13 May 2026): where is the authentic published text, and when was it published?
• Schedule (Schedule 1 to the Regulations; Fourth Schedule to the Act): what lists, rates or exclusions complete the operative rule?
• Commencement (1 January 2026): from what date do the obligations run?

Each element performs one function. The skill lies in reading them as a connected chain of authority rather than as seven separate tax laws.

How should an accountant verify a tax obligation?

Before advising a client, computing a liability or responding to an assessment, work through the following sequence and document each step in the working file.

1. Identify the governing Act. Establish whether the issue falls under the Nigeria Tax Act, 2025 (charging provisions), the Nigeria Tax Administration Act, 2025 (registration, filing, assessment, objection and enforcement), or another statute such as the Customs and Excise Management Act or a State revenue law.
2. Locate the exact section. Read the full section, including every subsection, proviso and cross-reference, and check the definitions in Section 201 of the Nigeria Tax Act, 2025 or the equivalent interpretation section.
3. Check for delegated rule-making. Determine whether the section, or Section 194, empowers the Minister, the Joint Revenue Board or the Nigeria Revenue Service to prescribe further rules, and confirm the limits of that power.
4. Examine the Regulation and its Schedules. Read the enabling preamble, the operative regulations and every Schedule, list and form. Confirm the instrument stays within the authority of its enabling section.
5. Verify publication and commencement. Note the Gazette number and date, the S.I. number and the commencement clause. Where commencement precedes publication, as with the 2026 Regulations, record the basis on which the earlier date applies.
6. Confirm who is covered. Test the taxpayer's facts against the charging words, the exclusions and any thresholds (for example, the ₦12 million nano-business turnover ceiling under the presumptive regime and the Schedule 1 exempt categories).
7. Check the administrative requirements. Identify the relevant tax authority, the return, the due date, the mode of payment and the objection window, which under the Regulations is 30 days from receipt of an assessment.
8. Check for amendments and later instruments. Confirm that the section and Regulation remain in force in their original form and that no later S.I., Finance Act provision or court decision has altered the position.

This discipline reduces the risk of relying on secondary summaries, applying a rule outside its intended scope, or defending a position before the Tax Appeal Tribunal on the strength of a circular rather than a statute. The same habit protects you on every other 2025 Act question, from zero-rated versus exempt VAT to the development levy.

What does this mean for your business?

For a business owner, these distinctions are not an academic exercise. They are the difference between paying what the law requires and paying what someone says the law requires. Do not assume that every tax announcement applies to you. Identify the enabling Act, read the relevant section, examine the authorised regulations, check the Schedules and confirm the commencement date before changing your pricing, payroll or cash flow planning.

For accountants, auditors and tax advisers, precise legal referencing lifts the quality of every deliverable: tax computations, compliance reviews, opinions, objection letters and responses to audit queries. A sound tax opinion identifies the legal authority for its conclusion, explains how the provision applies to the facts, and states candidly where the law is unsettled or where a regulation may be open to challenge.

The objective is not simply to know what a tax rule says. It is to establish, with authority you can cite, what the law actually requires in the client's circumstances.

FAQ

Is a Regulation the same as an Act? No. An Act is primary legislation passed by the National Assembly. A Regulation is subsidiary legislation made by a Minister or other authority under a power the Act confers, and it is valid only within that power.

Does an S.I. number mean a new tax has been introduced? No. The S.I. number is a registration reference. Whether a new charge exists depends on the enabling Act and the wording of the instrument. A regulation cannot create a tax the Act does not authorise.

Is a Gazette the same as a law? No. The Gazette is the official publication in which laws and instruments appear. Its date is evidence of publication, not necessarily the commencement date, which is governed by the instrument's own commencement clause and Section 2 of the Interpretation Act.

Can a taxpayer rely on a Schedule without reading the main Act? That is risky. A Schedule has legal force only because a section incorporates it, and that section defines who it applies to and on what conditions. Read them together.

Do circulars and public notices from the Nigeria Revenue Service bind me? They set out the administrator's interpretation and practice and are useful guidance, but they are not legislation. Where a circular and the Act differ, the Act prevails.

Where should I obtain reliable Nigerian tax legislation? Start with the Official Gazette, the National Assembly's published Acts, and the legislation pages of the Federal Ministry of Finance, the Nigeria Revenue Service and the Joint Revenue Board. Verify the current text, amendments, commencement and transitional provisions before relying on any rule.

The bottom line

When you encounter a reference such as Nigeria Presumptive Tax Regulations, 2026 (S.I. No. 24 of 2026), you should be able to identify the instrument, trace it to Section 29 of the Nigeria Tax Act, 2025, locate the Gazette in which it was published, confirm its commencement date and find the Schedule that completes it.

The Act establishes the framework. The Section identifies the provision. The Regulation supplies the authorised detail. The S.I. number identifies the instrument. The Gazette provides the official published text. The Schedule carries the supplementary content. Read in that order, Nigerian tax law becomes far less intimidating, and far harder to misquote.

Need help applying the Nigeria Tax Act, 2025 or the presumptive tax regime to your business, or responding to an NRS assessment? Contact VOG Global in Area 10, Garki, Abuja, or visit vog.global to speak with our tax team.

References

• Constitution of the Federal Republic of Nigeria 1999 (as amended), ss. 1, 4, 58 and 59; Second Schedule, Part I, Item 59.
• Interpretation Act, Cap. I23, Laws of the Federation of Nigeria 2004, ss. 2, 3, 10, 12 and 37.
• Evidence Act, 2011, s. 122.
• Nigeria Tax Act, 2025 (Act No. 7 of 2025), Official Gazette No. 117, Vol. 112, 26 June 2025; ss. 18, 20, 29, 56, 58, 59, 194 and 201; First, Third, Fourth, Fifth and Fourteenth Schedules.
• Nigeria Tax Administration Act, 2025; Nigeria Revenue Service (Establishment) Act, 2025; Joint Revenue Board (Establishment) Act, 2025.
• Nigeria Presumptive Tax Regulations, 2026 (S.I. No. 24 of 2026), Official Gazette No. 85, 13 May 2026; Schedule 1.
• Cape Brandy Syndicate v. Inland Revenue Commissioners [1921] 1 KB 64; Inland Revenue Commissioners v. Gittus [1920] 1 KB 563.
• A. O. Williams v. Lagos State Development and Property Corporation (1978) 3 SC 11; Governor of Oyo State v. Folayan (1995) 8 NWLR (Pt. 413) 292; Ahmadu v. Governor of Kogi State (2002) 3 NWLR (Pt. 755) 502.

This article is for general information and educational purposes and does not constitute legal or tax advice. Always consult the applicable official text and obtain professional advice before making a compliance or advisory decision.