Calculations of the size of a government budget deficit/surplus

Government and the Macro‑economy – Fiscal Policy (IGCSE 0455)

Learning Objective

  • Define the key terms related to the government budget.
  • Explain why governments spend and tax.
  • Identify the main fiscal‑policy measures.
  • Calculate the size of a budget deficit or surplus and interpret the result (AO1).
  • Analyse the likely macro‑economic impact of a deficit or surplus and evaluate the arguments for and against running a deficit (AO2/AO3).

Key Definitions (Syllabus 4.2.1)

TermCambridge definition
Government revenue All money received by the state, principally from taxes, duties, fees and income from state‑owned enterprises.
Government expenditure Total spending on goods and services, public‑sector wages, interest on the national debt, subsidies, welfare payments, etc.
Government budget The difference between total government revenue and total government expenditure for a given financial year.
Budget balance Revenue − Expenditure. A positive balance = surplus; a negative balance = deficit.
Budget deficit Occurs when total expenditure exceeds total revenue (expenditure > revenue).
Budget surplus Occurs when total revenue exceeds total expenditure (revenue > expenditure).
Fiscal policy The use of government spending and taxation to influence the macro‑economic objectives of growth, full employment, price stability and a fair distribution of income.

Why Does the Government Spend? (Syllabus 4.2.2)

  • Provision of public goods – defence, law‑enforcement, street lighting, security.
  • Redistribution of income – welfare benefits, pensions, progressive taxation.
  • Stabilisation of the economy – counter‑cyclical spending to smooth out recessions and booms.
  • Promotion of long‑term growth – investment in infrastructure, education and research.

Taxation – Purposes & Classifications (Syllabus 4.2.3)

Purposes of tax

PurposeExplanation
Revenue‑raisingFinances the core functions of the state.
RedistributionReduces inequality by taking more from higher incomes (progressive taxes) and providing benefits.
Discouraging demerit goodsExcise duties on tobacco, alcohol, fuel, etc.
Encouraging merit goodsTax reliefs for education, health, R&D.
Influencing aggregate demandChanges in tax rates can raise or lower total demand.

Classification of taxes

TypeDefinitionIGCSE examples
Direct Levied directly on individuals or organisations. Income tax, corporation tax, capital gains tax.
Indirect Collected by an intermediary (e.g., retailer) and passed to the government. VAT, excise duties, customs duties.
Progressive Rate rises as the tax base (income, profit) increases. Band‑based income tax.
Regressive Rate falls as the tax base increases – the poorer pay a larger proportion. VAT on basic goods.
Proportional (flat) Same rate for all levels of the tax base. Flat‑rate income tax, some payroll taxes.

Fiscal‑policy Measures (Syllabus 4.2.5)

The syllabus expects four specific measures:

  1. Changes in government spending (increase or decrease).
  2. Changes in taxation (cut or raise tax rates).
  3. Borrowing / deficit‑financing (issuing bonds to fund a deficit).
  4. Automatic stabilisers (welfare benefits, unemployment payments, progressive taxes that automatically change with income).

These measures are described as:

  • Expansionary fiscal policy – increase spending, cut taxes, or borrow more to raise aggregate demand (used in a recession).
  • Contractionary fiscal policy – decrease spending, raise taxes, or run a surplus to lower aggregate demand (used when inflation is a risk).

Effects of each measure on the four macro‑economic aims

MeasureGrowthEmploymentPrice stabilityIncome distribution
Increase spending ↑ AD → ↑ output ↑ AD → ↓ unemployment Risk of ↑ inflation if economy near full‑employment Can target disadvantaged groups (e.g., social housing)
Decrease spending ↓ AD → ↓ output ↓ AD → ↑ unemployment Helps contain inflation May hurt low‑income groups if cuts affect welfare
Cut taxes ↑ disposable income → ↑ consumption → ↑ AD ↑ AD → ↓ unemployment Potential inflationary pressure Progressive cuts can aid lower incomes; regressive cuts can widen inequality
Raise taxes ↓ disposable income → ↓ consumption → ↓ AD ↓ AD → ↑ unemployment Helps curb inflation Progressive taxes improve redistribution; regressive taxes may harm equity
Borrowing/deficit‑financing Provides extra resources for spending without immediate tax increase Same as increase spending – can boost employment Long‑term debt may raise interest rates (crowding‑out) → inflation risk Depends on how borrowed funds are used (investment vs consumption)
Automatic stabilisers Increase automatically in a downturn (welfare, unemployment benefits) → boost AD Reduce rise in unemployment Less likely to cause inflation because they are built‑in and temporary Progressive nature improves income distribution

Calculating the Budget Deficit / Surplus

Formula (expressed in the same monetary unit, e.g. £ million)

Budget Balance = Revenue – Expenditure

  • If Balance > 0 → Surplus
  • If Balance < 0 → Deficit

Step‑by‑Step Procedure

  1. Obtain the latest figures for total government revenue and total government expenditure (usually from the national budget or national accounts).
  2. Convert both figures to the same unit (e.g., £ million or £ billion).
  3. Apply the formula: Balance = Revenue – Expenditure.
  4. Interpret the sign:
    • Positive → surplus; state the amount.
    • Negative → deficit; state the absolute amount and note that it is a deficit.
  5. Write the answer in a full sentence, e.g. “The government recorded a £ 45 billion deficit in 2022/23.”

Worked Example – Deficit

ItemAmount (£ million)
Total Revenue850,000
Total Expenditure1,020,000

Balance = 850,000 – 1,020,000 = ‑170,000 £ million

Interpretation: Country A ran a **£ 170 billion deficit** in 2023/24.

Worked Example – Surplus

ItemAmount (£ million)
Total Revenue1,150,000
Total Expenditure1,080,000

Balance = 1,150,000 – 1,080,000 = +70,000 £ million

Interpretation: Country B recorded a **£ 70 billion surplus** in 2023/24.

Common Pitfalls (AO1)

  • Mixing units – always convert to the same unit before calculating.
  • Omitting interest payments on the national debt from total expenditure.
  • Mis‑reading the sign of the balance; a negative result from “Revenue − Expenditure” means a deficit.
  • Confusing “budget deficit” with “trade deficit”.

Analysis & Evaluation (AO2/AO3)

Why might a government deliberately run a deficit?

  • Counter‑cyclical stimulus (Keynesian) – increased spending or tax cuts raise aggregate demand, helping lift output and employment during a recession.
  • Long‑term investment – borrowing to finance infrastructure, education or research can raise future productive capacity and potential output.
  • Automatic stabilisers – welfare payments and unemployment benefits rise automatically when the economy slows, creating a built‑in deficit without active policy change.

Arguments against running a deficit

  • Higher public debt leads to larger interest payments, which can crowd out other spending (the “crowding‑out effect”).
  • If the economy is already near full employment, extra spending may fuel inflation.
  • Persistent deficits can undermine confidence in fiscal sustainability, raising borrowing costs and possibly leading to a debt crisis.
  • Deficits financed by borrowing may increase the future tax burden.

How to structure an essay‑type answer

  1. State the relevant economic theory (Keynesian, classical, monetarist).
  2. Explain the mechanism (e.g., how increased government spending shifts AD right, how borrowing affects interest rates).
  3. Provide real‑world examples (e.g., US stimulus after 2008, UK austerity 2010‑15, Japan’s long‑term deficits).
  4. Weigh short‑term benefits against long‑term risks, considering the country’s existing debt level, interest‑rate environment and inflationary pressures.
  5. Conclude by summarising which argument appears stronger in the given context.

Practice Questions

  1. Calculation: Country C reported total revenue of £ 920 million and total expenditure of £ 1,050 million. Calculate the budget balance and state whether it is a deficit or a surplus.
  2. Reverse calculation: Country D’s budget shows a surplus of £ 45 million. If total revenue was £ 1,200 million, what was total expenditure?
  3. Short answer: Explain why a government might deliberately run a deficit during a recession.
  4. Evaluation: Discuss the advantages and disadvantages of using expansionary fiscal policy to reduce unemployment in a country that already has a high level of public debt.

Suggested Diagram

A simple bar chart comparing “Revenue” and “Expenditure” for two fictional countries – one with a deficit (expenditure bar higher) and one with a surplus (revenue bar higher). Label the vertical axis in £ billion and add the caption: “Comparing revenue and expenditure to illustrate a budget deficit and a budget surplus”.

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