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Tax planning, avoidance and evasion: disclosure, anti-avoidance rules, thin capitalisation and tax havens

ICAN Professional, Advanced Taxation. Syllabus area E, tax management and planning

16 min read · Updated 8 November 2026

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In this part

Two companies in the same trade report similar profit before tax. One pays far more tax. The difference is not luck. The cheaper one chose hire over purchase, timed its asset purchases, kept its accounting date away from a bad commencement year and claimed every incentive open to it. All of that is legal.

A third company in the same town leaves rent income out of its return and writes in costs that were never incurred. That is also a way of paying less, and it is a crime. The exam tests where the line falls, and what the tax authority does on each side of it.

This topic covers tax planning, mandatory disclosure of planning arrangements, tax avoidance and how the law fights it, tax evasion, the comparison between them, thin capitalisation, tax havens, treaty shopping and the non-tax factors in choosing a location. The previous topic covered tax practice management. The next covers tax audit and investigation.

In 30 seconds

Planning: arranging affairs within the law to pay the least tax (timing, choice of structure, reliefs, incentives). Avoidance: using loopholes to reduce tax; legal unless the scheme is artificial. Evasion: illegal reduction by fraud or concealment; criminal, and assessments can be reopened beyond six years. Law: Nigeria Tax Administration Act (NTAA) 2025: s. 30 disclosure of tax planning, s. 46 artificial transactions, s. 47 prohibited tax avoidance arrangements.

Thin capitalisation: interest on related party loans is limited to 30% of EBITDA; excess carries forward up to five years. Tax havens: nil or nominal tax, secrecy and lack of transparency. Treaty shopping: setting up a company in a treaty country only to use its treaty.

Key terms in plain English

TermWhat it means
Tax planningArranging affairs to reduce or defer tax within the law
Tax avoidanceReducing tax by using gaps in the law; legal unless artificial
Tax evasionReducing tax by fraud, concealment or false returns; illegal
Disclosable arrangementA transaction whose main purpose is a tax advantage and which must be reported to the tax authority
Thin capitalisationFunding a company mainly by debt, so that interest erodes profit
EBITDAEarnings before interest, tax, depreciation and amortisation
Tax havenA place with nil or nominal tax, secrecy and low transparency
Treaty shoppingUsing a company in a treaty country only to get treaty benefits
General anti-avoidance ruleA broad rule that lets the authority disregard schemes whose main purpose is tax saving

Syllabus check

This topic is in syllabus area E (tax management and planning, 10% of marks). It covers:

  • tax planning, mandatory disclosure, avoidance and evasion, and the differences between them;
  • thin capitalisation, tax havens, treaty shopping and non-tax factors;
  • advising on planning activities and strategies.

CAMA 2020 and tax planning

The Companies and Allied Matters Act 2020 (CAMA 2020) is the company law of Nigeria. The sections below apply to this topic.

SectionWhat it saysLink to this topic
s. 305 and s. 308Directors must act in good faith in the interest of the company and with the care, diligence and skill of a prudent directorA director who approves an evasion scheme breaks these duties; lawful planning is part of acting in the company’s interest
s. 119A person with significant control must notify the company within seven daysOwnership records make it harder to hide behind offshore structures
s. 54A foreign company that wants to carry on business in Nigeria must incorporate a Nigerian companyA real Nigerian company has substance; a paper offshore entity does not
s. 377(1) and s. 378Directors prepare financial statements that give a true and fair viewFalse or incomplete accounts are the start of most evasion cases

The rules in more depth

Direct and indirect taxes

Direct taxes fall on income, profit or gains and are paid by the taxpayer to the authority: personal income tax, company income tax, hydrocarbon tax with company tax for petroleum companies, and the development levy. Indirect taxes are added to the price of goods, services or instruments and borne by the end user, while the seller remits them: value added tax, customs and excise duties and stamp duties.

If the person who remits the tax does not bear it, the tax is indirect.

Tax planning

Tax planning is a conscious effort to organise income and spending so as to lower tax within the law, at every point in time. Tax is a statutory duty and the penalties for non-payment are severe, but no one is bound to pay more than the law requires. Planning looks ahead for ways to cut or defer tax.

It aims to secure all allowances, exemptions and reliefs, takes account of the timing of asset purchases and disposals, the choice of accounting date and the effect of the commencement and cessation rules, and looks at when profit is earned and tax paid. Planning must itself be lawful and fully compliant: all taxes due are paid on time.

Checklist.

  • The taxes and levies that apply, and the critical dates: returns, objections, monthly PAYE, year-end PAYE, withholding tax, VAT, pension, housing fund and tax payments.
  • Timing of acquisition and disposal of assets, and of capital allowance claims.
  • Hire of an asset instead of purchase: the full hire charge is deductible.
  • Specific rather than general provisions for bad debts and similar items.
  • Gains: the exemption thresholds and any relief on reinvestment.
  • Incentives: the economic development incentive, export processing and free trade zone reliefs, exempt income and agriculture.
  • Where to invest: for example government bonds, and dividends that are franked investment income.
  • Pay structure for staff, with the tax effect of benefits in kind; PAYE and withholding tax deducted correctly.
  • Company size: a small company with turnover up to ₦100 million and fixed assets up to ₦250 million pays 0%.

A corporate review looks at income sources, expenses, deductions, profit distribution and rates against the law. Multinationals can also plan internationally by using differences in rates and reliefs between countries, although more and more countries restrict profit shifting.

Mandatory disclosure (NTAA s. 30)

A person who enters into, or intends to enter into, a transaction or agreement whose principal purpose is a tax advantage must give the tax authority information on it without notice or request. “Transaction” includes a course of action, agreement, scheme or arrangement.

The authority may make regulations on the information to be given, the form and manner, the time limit and administrative penalties for non-disclosure, false, incomplete or late disclosure. Authority guidance puts the time limit at 30 days from the earliest of the date the arrangement is implemented, the date the taxpayer becomes aware of it, or the date of the transaction document. Failure to disclose is an offence under s. 127.

A tax advantage means:

  • a relief or bigger relief
  • a repayment or bigger repayment
  • avoiding or reducing a charge or an assessment
  • avoiding a possible assessment
  • deferring a payment or advancing a repayment
  • avoiding an obligation to deduct or account for tax

Tax avoidance

Avoidance is arranging affairs to pay the least tax, by studying the law and using gaps. Avoiding VAT by not buying the goods is the simplest case. To the extent that no law is broken it is legal. The courts have said so.

In Ayrshire Pullman Motor Services v IRC, Lord Clyde said that no one is under any obligation, moral or otherwise, to arrange his affairs so as to enable the revenue to put the largest possible shovel into his stores, and the taxpayer is entitled to be astute to prevent, so far as he lawfully can, the depletion of his means.

In FIRS v American International Insurance Co (Nig) Plc, Belgore CJ said that tax is an obligation, not a duty, and that one is not a bad citizen for organising a trade lawfully to cut the burden. When a scheme is stretched, the transactions have form but no substance and no commercial effect, and the authority steps in.

High rates make elaborate schemes worth the cost, so widespread avoidance suggests the system needs reform.

Anti-avoidance legislation

TypeAdvantagesDisadvantages
Specific, to block known devicesClear and certain; easy to amendAdds complexity; taxpayers find new gaps, so there is no end to the legislation
General, giving power to disregard transactions made solely to avoid taxFewer rules; discourages all future schemes against the spirit of the lawVague; relies on the discretion of officials, who may go too far or not far enough

In the United Kingdom the courts developed a doctrine against schemes with pre-ordained steps and steps with no commercial purpose. In Ramsey v IRC a scheme to create allowable losses was genuine in every step but self-cancelling and produced neither gain nor loss, so it was disregarded. Furniss v Dawson extended the idea to a step inserted only to avoid tax.

A taxpayer can defend by showing the steps had a commercial reason and tax saving was not a main object. General rules have worked poorly in Australia, New Zealand and Canada, which supports specific rules.

Nigeria:

  • NTAA s. 46, artificial transactions. If the authority thinks a disposition is not given effect to, or a transaction that reduces tax is artificial or fictitious, it may disregard it or make adjustments to counteract the reduction and assess accordingly. A transaction between connected persons is deemed artificial if it is not on arm’s length terms.
  • NTAA s. 47, prohibited tax avoidance arrangements. The authority may counteract an arrangement by adjusting, disregarding or recharacterising it, unless the taxpayer proves that the benefit is in line with the object and purpose of the tax law. An arrangement is prohibited where it is reasonable to conclude that its main purpose is a tax benefit, the advantage is contrary to the object and purpose of the law, it misuses or abuses the law, or it lacks commercial substance in whole or in part. “Arrangement” covers any agreement, understanding, scheme, transaction or series of transactions, enforceable or not.
  • NTA s. 192, related party arrangements at arm’s length, with the Transfer Pricing Regulations.

Tax evasion

Evasion is the breach of the tax law by neglecting to pay tax due or by making fraudulent or untrue claims: understating income, overstating spending, false claims for reliefs, omitting income, and the failure to file that is common in Nigeria. It is more common where the system seems unfair or governance is opaque. The authority treats it seriously and may reopen assessments beyond the usual limit of six years.

The evader may be prosecuted and fined or jailed. Unless the sum is large and the taxpayer will not co-operate, the authority will often settle out of court for a lump sum covering tax and penalty.

Avoidance and evasion compared

PointAvoidanceEvasion
LegalityLegalIllegal
MethodExploits gaps in the lawFraud, deceit or false returns
ResultLeast tax without breaking the lawWrong tax or less tax, by breaking the law
CourtsSupported in decided casesNot supported
LiabilityNo criminal liabilityCriminal liability
Revenue actionMay disregard a scheme that is stretchedInvestigation and prosecution
Past yearsNot reopenedReopened beyond six years

Thin capitalisation

A company is thinly capitalised when it is funded far more by debt than equity. It worries creditors, who carry the risk of a company that has to repay most of its capital with interest and has little reserve, and tax authorities, who fear excessive interest deductions. Banks and insurers must hold a minimum of paid-up capital because their failure harms others.

Authorities limit the interest deduction, particularly on loans at non-commercial rates from connected parties; some limit it only for groups with foreign entities.

Nigeria (Third Schedule, para 2 NTA 2025). Interest is normally deductible. Interest on a loan from a foreign related party is limited to 30% of EBITDA. The part above that is excess interest and is disallowed. A disallowed amount may be carried forward and claimed in later years within the 30% limit, for up to five consecutive years after the year it arose.

The rule does not apply to Nigerian subsidiaries of foreign banks or insurers.

Tax havens

A tax haven is a state or territory that charges little or no tax on profit from transactions carried on there. The OECD looks at three factors:

  • nil or nominal tax and a presentation as a place for non-residents to escape high tax
  • protection of financial information against foreign scrutiny
  • lack of transparency in the legal and administrative rules, such as secret rulings

Havens are grouped into primary (where profit ends up, with shell companies owning the group’s intellectual property), semi-havens (producing goods for sale outside, with free zones or territorial taxation) and conduit havens (collecting and passing on income, such as Luxembourg and the Netherlands). Using all three is the “Dutch sandwich”. Other examples are Switzerland, Ireland, Jersey, the Isle of Man, Bermuda, the British Virgin Islands and the Cayman Islands.

Uses: personal residence (tax exiles), corporate residence (subsidiaries in many countries) and asset holding through an offshore trust or company.

Counter-measures:

  1. Controlled foreign company rules, which attribute the offshore profit to the home taxpayer.
  2. Transfer pricing rules, aided by the OECD guidelines.
  3. Limits on deductions and withholding tax on payments to offshore recipients.
  4. Tax on receipts from the haven entity, sometimes with notional interest.
  5. Exit charges on unrealised gains when a person or company emigrates.

Others include forced disclosure of tax schemes. Criticisms: idle cash that is costly to bring home; a heavier burden on the poor; links to fraud, money laundering and terrorism; and few convictions.

Treaty shopping

A resident of country C, which has no treaty with country A, sets up a company in country B, which has a treaty with A, and invests in A through it to claim the A to B treaty.

The principle of reciprocity is breached because A and B residents get no matching benefit from C. The answers are anti-treaty-shopping rules and limitation on benefits clauses that deny benefits to companies not truly resident in the treaty country or set up for the purpose.

Nigeria’s NTA 2025 (s. 121) gives treaty benefit only to a resident that is the beneficial owner of the income. Refuses it where a principal purpose is to obtain the advantage.

Non-tax factors in choosing a location

  • Economic and political stability.
  • Adequate physical, business, accounting and legal infrastructure.
  • Little bureaucracy.
  • Good communication channels.
  • Freedom to negotiate and repatriate profit.
  • An effective banking system.
  • A reliable dispute resolution system, including arbitration, and respect for the rule of law.
  • A common commercial language, and a few highly skilled professionals, since holding companies need few staff.

Worked examples

Example 1: which side of the line? (a) A company chooses to hire a machine instead of buying it. (b) A director leaves ₦20m of rent out of his return. (c) A company inserts a loop of transactions with an offshore company that has no staff, only to create a loss.

  1. (a) Planning: the hire charge is deductible and the law allows the choice.
  2. (b) Evasion: omission of income, criminal, and earlier years can be reopened.
  3. (c) Avoidance that is artificial: the authority may disregard it under ss. 46 and 47 NTAA.

Example 2: thin capitalisation. A Nigerian company has EBITDA of ₦400m and pays ₦150m of interest on a loan from a foreign related party. Next year its EBITDA is ₦600m and interest is ₦100m.

  1. Year 1 limit = 30% × 400 = ₦120m.
    Excess interest = 150 − 120 = ₦30m, disallowed.
    Extra tax at 30% = ₦9m.
  2. Year 2 limit = 30% × 600 = ₦180m.
    Interest is ₦100m, so there is ₦80m of room.
  3. The ₦30m brought forward can be claimed in year 2, because it fits within the room, and it is within the five years.

Example 3: disclosure date. A company signs an arrangement on 10 February, becomes aware of its tax effect on 15 February and implements it on 1 March.

  1. The earliest of the three dates is 10 February, the date of the transaction document.
  2. Disclosure is due 30 days later, on 12 March.
  3. Failure to disclose is an offence.

Example 4: treaty shopping. A company in country C has no treaty with Nigeria. It forms a shell in country B, which has a treaty, to receive a dividend from Nigeria at the treaty rate.

  1. The shell is not the beneficial owner of the dividend, and a principal purpose of the structure is the treaty benefit.
  2. The benefit is refused and the domestic rate of 10% applies.

How to score full marks

  • Define planning, avoidance and evasion in one line each, with legality.
  • Cite NTAA ss. 30, 46 and 47 and NTA s. 192.
  • Compute thin capitalisation with the 30% EBITDA limit, then carry forward.
  • Give the three OECD factors for a tax haven.
  • Add a remedy for each abuse: CFC rules, transfer pricing, limitation on benefits.

Common mistakes in the exam

  • Calling avoidance illegal.
  • Forgetting that evasion lets the authority go beyond six years.
  • Using the wrong base for thin capitalisation: it is EBITDA, not profit or turnover.
  • Losing the five-year carry forward limit.
  • Listing only two of the three OECD factors for a tax haven.
  • Writing about avoidance with no mention of the anti-avoidance rules.

Quick revision

  • Planning legal; avoidance legal until artificial; evasion illegal.
  • NTAA s. 30 disclosure (30 days, offence s. 127); s. 46 artificial; s. 47 prohibited arrangement.
  • Thin capitalisation: 30% of EBITDA, five-year carry forward, banks and insurers excluded.
  • Tax haven: nil tax, secrecy, no transparency.
  • Treaty shopping: beneficial owner and principal purpose tests.
  • CAMA 2020: ss. 54, 119, 305, 308, 377(1), 378.

Practice questions

These are original questions written in the style of the Institute of Chartered Accountants of Nigeria (ICAN) exam. Try each one before you open the answer. Full model answers follow the written questions.

Recall check: multiple choice

Recent ICAN papers are written, although older papers such as May 2014 included multiple-choice questions. These questions are for quick recall. The written questions that follow are closer to the exam.

Question 1. Reducing tax by fraud or concealment is:

  1. Tax planning
  2. Tax avoidance
  3. Tax evasion
  4. Tax relief
Show the answer

C. Evasion is illegal.

Question 2. Value added tax is an example of a:

  1. Direct tax
  2. Indirect tax
  3. Levy on profit
  4. Final tax
Show the answer

B. The seller remits it, the buyer bears it.

Question 3. Which section of the NTAA 2025 deals with artificial transactions?

  1. Section 30
  2. Section 46
  3. Section 47
  4. Section 51
Show the answer

B. Section 46.

Question 4. Which section of the NTAA 2025 requires disclosure of tax planning arrangements?

  1. Section 30
  2. Section 46
  3. Section 57
  4. Section 64
Show the answer

A. Section 30.

Question 5. Interest on a related party loan is limited to what share of EBITDA?

  1. 10%
  2. 20%
  3. 30%
  4. 50%
Show the answer

C. 30%.

Question 6. Excess interest can be carried forward for up to:

  1. 1 year
  2. 3 years
  3. 5 years
  4. 10 years
Show the answer

C. Five consecutive years.

Question 7. Which is not one of the OECD factors for a tax haven?

  1. Nil or nominal tax
  2. Protection of financial information
  3. Lack of transparency
  4. High tax rates
Show the answer

D. High rates do not make a haven.

Question 8. Ramsey v IRC concerned a scheme that was:

  1. Self-cancelling
  2. Fraudulent
  3. Statute-barred
  4. Exempt
Show the answer

A. Every step was genuine but the scheme produced no real gain or loss.

Question 9. Evasion allows the tax authority to reopen assessments beyond:

  1. 1 year
  2. 3 years
  3. 6 years
  4. 20 years
Show the answer

C. Beyond the normal six years.

Question 10. Which section of CAMA 2020 sets the director's duty to act in good faith?

  1. Section 119
  2. Section 305
  3. Section 377
  4. Section 426
Show the answer

B. Section 305.

Written questions

Question 11 (10 marks). Distinguish tax avoidance from tax evasion in a table of five points. (10 marks)

Question 12 (20 marks). A Nigerian company has EBITDA of ₦400m and pays ₦150m of interest on a loan from a foreign related party. Next year its EBITDA is ₦600m and interest is ₦100m. (a) State the rule on interest and the carry forward. (6 marks) (b) Compute the excess interest and extra tax at 30% for year 1. (6 marks) (c) State the treatment in year 2. (4 marks) (d) State two problems thin capitalisation causes. (4 marks)

Question 13 (10 marks). (a) State the OECD factors for identifying a tax haven. (3 marks) (b) State four measures countries use against tax havens. (4 marks) (c) Explain treaty shopping and one answer to it. (3 marks)

Model answers

Show the model answer to Question 11

Any five points, 2 marks each:

  • avoidance is legal, evasion is illegal
  • avoidance uses gaps in the law, evasion uses fraud, deceit or false returns
  • avoidance gives the least tax without breaking the law, evasion gives the wrong tax by breaking it
  • the courts support avoidance but not evasion
  • avoidance has no criminal liability, evasion has
  • a stretched avoidance scheme may be disregarded, evasion is investigated
  • avoidance does not reopen past years, evasion can reopen assessments beyond six years
Show the model answer to Question 12

(a) Rule (6 marks). Interest on a loan from a foreign related party is limited to 30% of EBITDA. (2) The excess is disallowed. (2) It may be carried forward and claimed within the 30% limit for up to five consecutive years. (2)

(b) Year 1 (6 marks).

  1. Limit = 30% × 400 = ₦120m. (2)
  2. Excess = 150 − 120 = ₦30m. (2)
  3. Extra tax.
    30% × 30 = ₦9m. (2)

(c) Year 2 (4 marks).

  1. Limit = 30% × 600 = ₦180m. (1)
  2. Interest of ₦100m leaves room of ₦80m. (1)
  3. The ₦30m brought forward is claimed in full. (2)

(d) Problems (4 marks). Creditors bear the solvency risk of a company that must repay most of its capital with interest; (2) tax authorities face excessive interest deductions. (2)

Show the model answer to Question 13

(a) OECD factors (3 marks). Nil or nominal tax; (1) protection of financial information against foreign scrutiny; (1) lack of transparency. (1)

(b) Measures (4 marks). Any four:

  • controlled foreign company rules
  • transfer pricing rules
  • limits on deductions or withholding tax on payments offshore
  • taxing receipts from the haven entity
  • exit charges
  • forced disclosure

(1 each)

(c) Treaty shopping (3 marks). A resident of a country with no treaty sets up an entity in a treaty country to claim its treaty benefits. (2) It can be answered by anti-treaty-shopping rules and limitation on benefits clauses. (1)

Pathfinder on Planning, NTAA ss. 30, 46 and 47, thin capitalisation, tax havens, treaty shopping and non-tax factors

These are the ICAN Pathfinder questions that test this topic. ICAN owns the questions and the suggested solutions, so we point you to them and do not copy them. Open your Pathfinder, attempt each question under exam conditions, then check your answer against the notes above.

November Diet, 2025, Question 6(a)

Part (a) asked what thin capitalisation and treaty shopping mean and the tax consequences of each. Our sections on thin capitalisation and treaty shopping answer it; the 30% of EBITDA limit now sits in the NTA Third Schedule.

Revise first: Thin capitalisation

May Diet, 2024, Question 7(a) and (b)

Parts (a) and (b) asked for the concept and practice of treaty shopping and the strategies countries use against it, such as limitation on benefits clauses.

Revise first: Treaty shopping

May Diet, 2023, Question 6

The question asked for the meaning of thin capitalisation, the Finance Act 2019 rule, and six non-tax factors in choosing where a holding company is located. Our sections on thin capitalisation and non-tax factors cover each part.

Revise first: Thin capitalisation

November Diet, 2021, Question 3

The question asked for the meaning of tax planning, tax avoidance and thin capitalisation, planning strategies, and the tax effect of each, including the 30% of EBITDA interest limit. Our sections on tax planning, tax avoidance and thin capitalisation cover each part.

Revise first: Tax planning

Source: ICAN Pathfinder, Advanced Taxation. Diets covered: November Diet, 2025; May Diet, 2024; May Diet, 2023 and November Diet, 2021.

Spotted a mistake? Tell us and we will check it.

Where this fits

See every past question on Advanced Taxation and the topic each one tests in the Pathfinder question finder.

This course builds on Taxation. After it, move on to Case Study.

All Advanced Taxation topics

You are reading topic 24 of 37.

  1. National tax policy01
  2. Tax administration and multiplicity of taxes02
  3. Objections and tax appeals03
  4. Companies income tax: framework, residence and basis periods04
  5. Adjusted profit: allowable and disallowable expenses05
  6. Loss relief06
  7. Capital allowances07
  8. Chargeable gains08
  9. Taxation of investment income09
  10. Tax incentives and free trade zones10
  11. Assessable profit, total profit and the company tax computation11
  12. Taxation of leases12
  13. Non-resident taxation13
  14. Taxation of the digital economy14
  15. Tax treaties and double taxation relief15
  16. Transfer pricing16
  17. Base erosion and profit shifting17
  18. Regional integration and trade blocs18
  19. International tax policy and exchange of information19
  20. Current tax issues20
  21. Emerging trends: sustainable development and tax21
  22. Mergers and acquisitions: tax considerations22
  23. Tax practice management23
  24. Tax planning, avoidance and evasion24 here
  25. Tax audit and tax investigation25
  26. Ethics and professionalism in tax26
  27. Tax accounting and reporting27
  28. Petroleum industry: structure, licences and transition28
  29. Hydrocarbon tax and companies income tax of petroleum companies29
  30. Petroleum incentives, royalties and the host community fund30
  31. Petroleum companies: offences, filing and enforcement31
  32. Petroleum profits tax and production sharing contracts32
  33. Mining: regulation, titles and incentives33
  34. Mining: tax computation, royalties and penalties34
  35. Environmental, social and governance matters in the extractive industries35
  36. Nigeria Tax Act 2025: overview of the new tax laws36
  37. Withholding tax in Nigeria37
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