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NotesEconomicsTopic 3.4Taxation and equity
Back to Economics Topics
3.4.45 min read

Taxation and equity

IB Economics · Unit 3

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Contents

  1. 1Progressive, proportional, regressive
  2. 2Direct and indirect taxes
  3. 3The limits of taxation
  4. 4Exam-style question

Who pays more tax, as a share of income? It depends on the kind of tax.

Three kinds of tax

1

Progressive

The share of income taken rises as income rises.

Rich pay a higher %
2

Proportional

Everyone pays the same share of income.

Same %
3

Regressive

The share of income taken falls as income rises.

Poor pay a higher %

Corland (made-up numbers): the % is of each person's income

TaxMia earns €20,000Leo earns €80,000Kind
Income tax in bands€2,000 (10%)€20,000 (25%)Progressive
A flat 15% tax€3,000 (15%)€12,000 (15%)Proportional
20% VAT on spending€2,700 (13.5%)€8,000 (10%)Regressive

The points to remember

  • Marginal rate: the tax on the next euro earned (Leo's is 40%).
  • Average rate: total tax ÷ income (Leo's is €20,000 ÷ €80,000 = 25%).

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Direct taxes fall on income and wealth; indirect taxes fall on spending.

Direct taxes: on income and wealth

  • Personal income tax, often in bands with higher rates.
  • Corporate income tax on firms' profits.
  • Wealth taxes: property, inheritance (the UK charges 40% above £325,000).

Indirect taxes: on spending

  • VAT or GST on most goods and services.
  • Excise taxes on fuel, alcohol and tobacco.
  • Usually regressive: the poor spend more of their income.

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Taxation narrows the gap, but it has limits.

How far can taxes go?

1

Less incentive

Very high top rates may reduce work, saving and enterprise.

Disincentive
2

Avoidance

The rich can move income or wealth abroad, or into lower-taxed forms.

Leakage
3

Regressive taxes

VAT raises the cost of living most for the poor.

Indirect
4

Only half the job

Taxes take money; transfers and services must deliver it.

Spending

The points to remember

  • Zero-rate essentials: the UK charges no VAT on most food.
  • Other policies help too: transfers, education, minimum wages (the next micro-topic).

Paper 1 asked this in May 2025, as part (b) for 15 marks.

IB-style questionDiscuss[15 marks]

Using real-world examples, discuss the role of taxation in reducing income and wealth inequalities.

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How the 15 marks are given

MarksWhat your answer needs
13–15Theory fully explained, terms right all the way through, balanced evaluation, real examples fully developed to support the argument
10–12Theory explained, terms mostly right, evaluation mostly balanced, real examples developed
7–9Theory partly explained, some evaluation but one-sided, examples partly developed
4–6Theory only described, evaluation superficial, examples only named
1–3Theory stated but not relevant, no evaluation

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A text notes that Halden’s income tax is progressive.

the term progressive tax.
[2 marks]

Related Economics Topics

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3.1.1What is GDP and how is it measured?3.1.2Real vs nominal GDP and comparisons3.1.3GDP and well-being3.1.4The business cycle
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