Taxation (UK) · The overall function and purpose of taxation in a modern economy

Function and Purpose of Taxation in a Modern Economy

Updated 11 October 2026 · Fact-checked

Governments levy taxes mainly to raise revenue to pay for public services. They also use tax to redistribute wealth and to influence behaviour, such as encouraging saving or discouraging harmful activity. To answer exam questions, state the purpose, then link it to a specific UK tax example.

Understand Function and Purpose of Taxation in a Modern Economy

A modern government needs money to pay for health, education, defence, courts and welfare. Taxes are compulsory payments to the state. You do not get a direct, matching benefit in return for what you pay. That is what separates tax from a fee.

The first purpose is raising revenue. Income tax, National Insurance, VAT, corporation tax and capital gains tax all fund government spending. Without revenue the state would have to borrow all it spends.

The second purpose is redistribution of wealth and income. Progressive taxes take a higher share from those who earn or own more. Income tax does this with its rising rates: 20% on the basic rate band, 40% on the higher rate band and 45% above that. Inheritance tax, with its nil rate band and 40% death rate, also reduces the concentration of wealth passing between generations.

The third purpose is influencing behaviour, sometimes called economic and social regulation. Governments give reliefs to encourage things they want, such as pension saving, charitable giving, investment in business assets and saving through ISAs. They may also tax things they want to discourage. Tax can also be used to manage the economy, for example by changing rates to stimulate or slow spending.

In practice one tax often serves several purposes. Capital gains tax raises revenue, but its annual exempt amount and business asset disposal relief shape behaviour. The exam asks you to explain, not just list, so always tie each purpose to an example.

Key rules to remember

Main purposes of taxation: Raise revenue + Redistribute wealth + Influence behaviour; Use these three headings to structure any written answer on why governments levy taxes.
Progressive tax: Higher income → higher percentage of tax; Example: income tax rates of 20%, 40% and 45% on normal income.
UK income tax normal rates: 20% up to £37,700; 40% to £125,140; 45% above; These are the bands ACCA gives you in the exam. Use them to illustrate redistribution.
Inheritance tax rates: Nil rate band £325,000; death rate 40%; lifetime rate 20%; Use to illustrate redistribution of wealth.
Capital gains tax annual exempt amount: £3,000; An example of a relief that shapes behaviour and removes small gains from the tax net.

How to solve Function and Purpose of Taxation in a Modern Economy questions

Use this method for any question asking why a tax exists or what a relief is designed to achieve.

1Read the question and identify the tax, relief or rule named.
2Decide which purpose it mainly serves: revenue, redistribution or behaviour.
3State the purpose in one clear sentence using the exact word from the question.
4Give a specific UK example with a figure or rate from the ACCA rates provided.
5Explain how the example achieves the purpose, using a 'because' or 'so that' link.
6If marks allow, mention a second purpose the same tax may serve.
7Check that you made as many distinct points as there are marks.

Quickest way: Purpose, example, link

When to use it: Use for short written parts or objective questions on why a tax or relief exists.

Name the purpose: revenue, redistribution or behaviour.
Attach one real UK tax or relief to it.
Add one phrase explaining the effect.
Move on once you have one point per mark.

Common mistakes in Function and Purpose of Taxation in a Modern Economy

Saying tax exists only to raise money.
Revenue is the most obvious purpose, so students stop there.
Fix: Always cover redistribution and influencing behaviour too, with an example of each.
Listing purposes without examples.
Students memorise headings and skip application.
Fix: Attach a named UK tax or relief to every purpose, such as ISAs for saving or inheritance tax for wealth.
Confusing a tax with a fee or charge.
Both involve paying the state.
Fix: Remember tax is compulsory and not linked to a specific benefit received by the payer.
Calling a regressive tax progressive.
Students see that the rate is the same for everyone and assume this means the tax is fair or redistributes. A flat rate is not the same thing as a progressive tax.
Fix: VAT at 20% is charged at the same rate on spending. Lower earners spend a higher proportion of their income, so VAT takes a larger share of their income. It is regressive in effect, so it is not designed to redistribute.
Quoting rates from memory that are out of date.
Rates change with each Finance Act.
Fix: Use only the rates in the ACCA tax tables for Finance Act 2025, and describe the purpose in words if unsure.

Worked examples

Example 1

Explain three reasons why a government levies taxes, giving a UK example of each. (3 marks)

Show the solution

Reason 1: raising revenue. Governments need funds for public services. Example: income tax and VAT at 20% raise general revenue, which the government uses to fund public services such as health and education.
Reason 2: redistributing wealth. Progressive taxes take more from those with more. Example: income tax at 20%, 40% and 45% as income rises, and inheritance tax at 40% on death above the nil rate band.
Reason 3: influencing behaviour. Reliefs and charges steer choices. Example: ISAs encourage saving and gift aid encourages giving to charity.

Answer: Taxes raise revenue for public services, redistribute wealth through progressive rates and inheritance tax, and influence behaviour through reliefs such as ISAs.

Example 2

Mia says that the £3,000 capital gains tax annual exempt amount has nothing to do with the purpose of taxation. Explain whether she is right. (2 marks)

Show the solution

The annual exempt amount means gains up to £3,000 in a tax year are not taxed for an individual.
This removes small gains from the tax system, which lowers administration for both taxpayers and HMRC.
It also shapes behaviour, because individuals can plan disposals across tax years to use the exemption.

Answer: Mia is wrong. The annual exempt amount is a relief that influences behaviour and keeps small gains out of the tax net, while the tax itself raises revenue.

Exam tips

Structure written answers under the three purposes so the marker can award a mark for each.
Always give a UK example. A bare statement of purpose rarely earns the full mark.
Learn the purpose of each tax and relief. Quote any rate or figure from the tax tables supplied in the exam, and check it against the tables before you write it.
In objective questions, check whether the question asks about the purpose of the tax or its administration. They are different topics.
Link this topic to later chapters. Relief questions often ask what behaviour the government wants to encourage.

Practice questions from The overall function and purpose of taxation in a modern economy

Function and Purpose of Taxation in a Modern Economy: frequently asked questions

Why do governments levy taxes?

Mainly to raise revenue to fund public services. They also redistribute wealth and influence economic and social behaviour. A good answer covers all three.

How does tax redistribute wealth?

Progressive taxes take a higher share from people with higher income or wealth. UK income tax rates rise from 20% to 40% to 45%, and inheritance tax charges 40% on death above the nil rate band.

Which taxes influence behaviour?

Many reliefs do. ISAs encourage saving, pension relief encourages retirement provision, and business asset disposal relief encourages investment in businesses.

Is this topic examined as calculations?

Rarely. It is mostly tested through short written points or objective questions, so learn the three purposes with a UK example for each.