Chapter 1

Part A: Income tax

Taxation concepts and the regulatory framework

Last updated November 202612 sectionsabout 11 min read

Key takeaways

A tax is a compulsory charge imposed by government to fund public expenditure, not given in direct exchange for a specific service.
Taxes are classified by rate (progressive, digressive, regressive, proportional) and by effect: a direct tax falls on the person who bears it, an indirect tax is levied on a transaction and can usually be shifted through the price.
Tax impact is where a tax is first levied; tax incidence is where it is finally borne after shifting, and the two coincide only where the tax cannot be shifted.
The canons of a good tax are equity, economy, convenience, certainty, simplicity, elasticity, flexibility, productivity and diversity.
Evasion reduces a tax bill illegally; avoidance arranges affairs lawfully, though a scheme with no genuine commercial purpose can be disregarded under general anti-avoidance rules.

Kenya's tax system rests on the Income Tax Act, the VAT Act, the Tax Procedures Act and the East African Community Customs Management Act, administered by the Kenya Revenue Authority (KRA). This chapter fixes the vocabulary and principles every later chapter in this paper assumes.

Which rates to apply

The tax rates, bands, reliefs and thresholds used throughout this material are the general ones, and they are given so that each computation can be worked through end to end. They apply unless the exam paper states otherwise. Where the question, or the tax tables supplied with it, indicates different rates, those are the rates to apply. Finance Acts change rates from year to year, but the method does not change, and the method is what earns the marks.

Definitions

Tax

A compulsory financial charge imposed by government on persons or entities, not given in direct exchange for a specific service, used to fund public expenditure.

Income tax

A direct tax charged on income accrued in or derived from Kenya, and on certain income of a Kenyan resident earned elsewhere, chargeable under the Income Tax Act.

Value Added Tax

An indirect tax charged on the value added at each stage of the supply of taxable goods and services, ultimately borne by the final consumer.

Excise duty

A duty charged on the local manufacture or importation of specified goods and services (alcohol, tobacco, fuel, and certain other excisable goods and services), whether or not they are essential.

Customs duty

A duty charged on goods imported into, or in some cases exported from, Kenya and the wider East African Community customs territory.

Advance tax

Tax paid in advance by the owner or operator of certain public service and commercial vehicles before a licence is issued, later credited against the tax finally assessed.

Instalment tax

Income tax paid in periodic instalments during the year, in advance of the final self-assessment, based on the taxpayer's estimated or prior-year tax liability.

Capital gain tax

A tax charged on the gain realised when certain property (land, buildings and shares in unlisted companies among the categories) is transferred at a price above its adjusted cost.

Purposes of taxation

Revenue raising, funding public expenditure on infrastructure, security, health and education
Redistribution of income and wealth, through progressive rates and targeted relief
Regulation of economic activity, discouraging consumption of demerit goods (e.g. excise on tobacco and alcohol) or encouraging desired behaviour through relief
Protection of local industry, through import duty that makes competing imports relatively more expensive
Correction of externalities, taxing activities that impose a cost on society beyond the price paid by the producer or consumer
Price stability, used alongside monetary policy to manage aggregate demand

Statutory deductions

Statutory deductions are amounts an employer is legally required to withhold from an employee's pay and remit to the relevant authority; ATD Business Mathematics and Statistics covers how each is computed, this guide places them in the wider tax framework.

Pay As You Earn (PAYE)

Income tax withheld by the employer from an employee's taxable pay, computed on the graduated individual tax bands currently in force, and remitted to KRA.

NSSF

The mandatory National Social Security Fund retirement contribution, shared between employer and employee; not itself a tax, but a compulsory statutory deduction.

NHIF

The statutory health-cover deduction named in the syllabus; now collected as the Social Health Insurance Fund (SHIF) contribution under the Social Health Insurance Act, the same successor noted in ATD Business Mathematics and Statistics, at 2.75% of gross pay.

Affordable Housing Levy

Not on the syllabus's list of three, but on every Kenyan payslip since 2024: 1.5% of gross pay from the employee, matched by 1.5% from the employer, under the Affordable Housing Act, 2024. Like NSSF and SHIF it is deducted from pay before PAYE is computed.

Rates as at 1 July 2025

SHIF is 2.75% of gross pay with a KES 300 minimum under the Social Health Insurance Act, 2023, from October 2024; the Affordable Housing Levy is 1.5% from the employee and 1.5% from the employer under the Affordable Housing Act, 2024; NSSF follows the NSSF Act, 2013 tiers in force from February 2025, 6% of pay up to KES 8,000 (tier I) and 6% of pay between 8,000 and 72,000 (tier II), employer matching. Finance Acts revise these figures: use the rates a question supplies.

Classification by rate

Progressive

The rate of tax rises as the taxable amount rises, so a higher earner pays a higher proportion of income in tax. Kenya's individual PAYE bands are progressive.

Digressive

Rates rise with income but at a diminishing rate beyond a certain point, so the tax is progressive only up to that point and closer to proportional above it.

Regressive

The rate of tax falls as the taxable amount rises, so a lower earner pays a higher proportion of income; a flat-rate tax on a necessity (such as VAT on a basic good) behaves regressively relative to income, since it takes a larger share of a poorer household's income.

Proportional

A single, constant rate applies regardless of the amount taxed, so tax paid rises in direct proportion to the taxable amount. Kenya's standard corporate income tax rate is proportional.

Classification by effect

Tax effect

The overall economic consequence a tax has, on prices, on behaviour, and on the distribution of income.

Tax impact

The point at which a tax is initially levied, on whoever is legally liable to pay it to the authority in the first instance.

Tax incidence

The point at which a tax is finally borne, after any shifting (see Tax shifting, above) has taken place; impact and incidence coincide only where the tax cannot be shifted.

Direct taxes

Taxes levied directly on the income or wealth of the person who bears them, and which cannot be shifted to someone else; income tax and capital gains tax are direct taxes.

Indirect taxes

Taxes levied on a transaction (typically a supply of goods or services) rather than directly on income, and which can usually be shifted, wholly or partly, to another party through the price charged; VAT, excise and customs duty are indirect taxes.

Tax shifting

Forward shifting

The person initially liable passes the burden of the tax forward, to the buyer, through a higher price.

Backward shifting

The person initially liable passes the burden backward, to their supplier, by negotiating a lower purchase price.

Factors that determine the tax shifting

Chiefly the price elasticity of demand and supply for the good in question: the more inelastic demand is relative to supply, the more of the tax a seller can shift forward to the buyer, and vice versa. Market structure (how much competition the seller faces) and the length of time available to adjust also matter.

Principles of taxation

These are the classical canons of a good tax, first set out by Adam Smith and extended since, and a recurring source of short-answer questions.

Equity

Taxpayers in similar circumstances should bear a similar burden (horizontal equity), and those with greater ability to pay should bear more (vertical equity).

Economy

The cost of collecting a tax should be small relative to the revenue it raises.

Convenience

The manner and timing of payment should be convenient for the taxpayer, PAYE deducted at source is a deliberately convenient design.

Certainty

The amount, timing and manner of payment should be clear and predictable to the taxpayer, not arbitrary.

Simplicity

Tax rules should be easy for an ordinary taxpayer to understand and comply with.

Elasticity

Revenue should be capable of rising as national income rises, without needing a new tax to be introduced.

Flexibility

The system should be capable of being adjusted relatively quickly to changing economic circumstances.

Productivity

A tax should raise a significant amount of revenue relative to the administrative effort of collecting it.

Diversity

Government should draw revenue from a range of tax sources rather than relying too heavily on any one, spreading the burden and reducing the risk of one source underperforming.

Tax evasion

Ways of tax evasion

Deliberately illegal methods of reducing a tax bill:

Understating income
Inflating expenses
Failing to register or file returns
Smuggling goods to avoid customs and excise duty
Issuing fraudulent tax invoices

Measures the government can put in place to prevent tax evasion

The measures include:

Stronger audit and investigation capacity
Third-party data matching (banks, employers, land registries)
Simplifying compliance so evasion is less attractive than compliance
Harsher penalties
Taxpayer education
Technology such as iTax and the Electronic Tax Register (see the chapter on administration of income tax) that makes transactions harder to conceal

Tax avoidance

Tax avoidance is the lawful arrangement of one's affairs to minimise tax liability, using provisions Parliament itself has enacted, structuring transactions to qualify for a relief, an allowance or a lower rate, rather than breaking the law as evasion does. KRA and the courts nonetheless treat avoidance schemes with no genuine commercial purpose beyond obtaining a tax advantage as abusive, and general anti-avoidance rules allow such arrangements to be disregarded for tax purposes even though no law was technically broken.

Sources of taxable income

Employment
Business, trade, profession or vocation
Investment income, dividends, interest, capital gains, rent and royalties
Farming
Any other gains or profits not otherwise exempted

Rules for taxing income

Kenya's Income Tax Act taxes income on a source basis as its default rule: any income accrued in, or derived from, Kenya is taxable regardless of who earns it or where they are resident. Residents are, in addition, brought into charge on certain categories of income earned outside Kenya, which is why residence status (see Residence, below) has to be established before a person's full tax position can be determined.

Residence

Body corporates

A company is resident in Kenya if it is incorporated under Kenyan law, or if its management and control were exercised in Kenya in the year of income, even if it was incorporated elsewhere.

Individuals

An individual is resident in Kenya if they:

Have a permanent home in Kenya and were present in Kenya at any time during the year; or
Have no permanent home in Kenya but were present in Kenya for 183 days or more in aggregate during the year; or
Were present in Kenya for an average of more than 122 days a year in that year and each of the two preceding years

Exam tip

Residence questions almost always give a set of facts (days present, where a permanent home is) and ask you to apply the residence tests directly. Work through all three individual tests in order rather than stopping at the first one that seems to apply, since a candidate can be resident under more than one limb.

Self-check

(a) Distinguish tax impact from tax incidence. (3 marks)

(b) An individual was present in Kenya for 190 days in the current year and has no permanent home in Kenya. State whether they are resident, and why. (2 marks)

(d) State two of the classical canons of a good tax besides equity. (2 marks)

Show worked answer

(a) Tax impact is the point at which a tax is initially levied, on whoever is legally liable to pay it in the first instance; tax incidence is the point at which the tax is finally borne, after any shifting has taken place, the two coincide only where the tax cannot be shifted (3 marks).

(b) Resident, since they have no permanent home in Kenya but were present in Kenya for 183 days or more in aggregate during the year, and 190 days exceeds that threshold (2 marks).

(c) Tax evasion is the illegal reduction of a tax bill, understating income, inflating expenses, failing to file; tax avoidance is the lawful arrangement of one's affairs to minimise tax liability using provisions Parliament has enacted, not illegal, though schemes with no genuine commercial purpose can be disregarded under general anti-avoidance rules (3 marks).

(d) Any two of: economy; convenience; certainty; simplicity; elasticity; flexibility; productivity; diversity (2 marks).