OxfordAQA International GCSE Economics: Interest rates, government revenue and spending, and taxation (9214)

This guide follows the OxfordAQA International GCSE Economics (9214) specification, version 1.0, for exams from May/June 2025. It covers sections 3.2.1.1 (interest rates, saving, borrowing, spending and investment) and 3.2.1.2 (government income and expenditure), which open section 3.2, How economies work. All figures are invented and illustrative.

Related: the revision notes, the practice questions, the next sub-topic in government objectives, the course hub, the printable checklist and the free 10-minute diagnostics.

What you must be able to do

Section	Outcome
3.2.1.1	What an interest rate is, including sharia-compliant alternatives
3.2.1.1	How rate changes affect consumers’ decisions to save, borrow or spend
3.2.1.1	How rate changes affect producers’ decisions to save, borrow or invest
3.2.1.2	Main sources of revenue and main areas of spending
3.2.1.2	Direct versus indirect taxation
3.2.1.2	Some taxes are progressive and others regressive

The specification introduces interest rates briefly, to show the effect on saving, borrowing and spending. Keep answers at that level: clear chains of reasoning.

3.2.1.1 Interest rates

What an interest rate is

An interest rate is what it costs to borrow money, stated as an annual percentage of the sum borrowed. For a saver it is the reward for lending money to a bank: the percentage added to the deposit each year. The two are linked. A bank charges borrowers more than it pays savers, and the gap covers its costs, risks and profit.

Interest for one year = sum × rate.

Worked example 1 (illustrative). A saver puts 2,000 currency units (cu) in a deposit account.

• At 3%: 2,000 × 0.03 = 60 cu, so the balance after one year is 2,060 cu.
• At 5%: 2,000 × 0.05 = 100 cu, so the balance is 2,100 cu. That is 40 cu more.

Reward and cost

Worked example 2. A bank pays savers 3% and charges borrowers 8%.

• A saver with 10,000 cu on deposit earns 10,000 × 0.03 = 300 cu a year.
• A borrower with a 10,000 cu loan pays 10,000 × 0.08 = 800 cu a year.
• The bank keeps the 500 cu gap to cover its costs, the risk that some loans are not repaid, and its profit.

Sharia-compliant alternatives

Islamic finance does not allow riba, which means a fixed charge for lending money, so interest is avoided. Sharia-compliant finance instead links the return to a real trade, an asset or a share of profit. Common forms:

Form	How it works
Profit-sharing (mudarabah)	One party supplies the funds, the other manages the business. Profit is split in an agreed ratio. Financial loss falls on the party that supplied the funds
Partnership (musharakah)	Both parties put in funds. Profit is shared in an agreed ratio. Losses are shared according to each party’s contribution
Cost-plus sale (murabaha)	The bank buys the item and sells it on to the customer at the cost plus an agreed, disclosed mark-up, paid in instalments
Leasing (ijara)	The bank owns the asset and the customer pays rent to use it
Asset-backed certificates (sukuk)	Investors hold a share in an asset and receive part of the income it produces

Worked example 3. A print workshop needs a press costing 50,000 cu.

• Murabaha: the bank buys the press for 50,000 cu and sells it on for 53,000 cu in 12 instalments. The fixed mark-up of 3,000 cu is 6% of the cost.
• Mudarabah: on a profit of 10,000 cu split 60:40 between bank and workshop, the bank gets 6,000 cu and the workshop 4,000 cu. With no profit, the bank gets nothing.
• A saver in a profit-sharing account may earn 4% one year (80 cu on 2,000 cu) and 2% the next (40 cu): the return is not fixed.

Sharia-compliant finance avoids interest by tying returns to assets, sales or profit. Providers may still price with an eye on market rates, so effects on spending can be similar.

Effects on consumers: save, borrow or spend

When rates rise:

• Saving becomes more attractive: the reward is bigger, and each unit spent now gives up more future interest (a higher opportunity cost of spending).
• Borrowing becomes more expensive: loans, credit cards and variable-rate mortgages cost more, so fewer people take them out for cars, furniture or housing.
• Spending falls, as saving rises and borrowers have less income left after paying interest.

When rates fall, the reverse happens.

Worked example 4. A household has a 100,000 cu variable-rate mortgage and an after-tax income of 24,000 cu a year.

• At 5%: interest is 5,000 cu a year (416.67 cu a month), which is 20.8% of income.
• The rate rises to 7%: interest is 7,000 cu a year (583.33 cu a month), which is 29.2% of income.
• The extra cost is 2,000 cu a year (166.67 cu a month). If it comes out of money that would have been spent, spending falls by up to 2,000 cu.

Evaluation points. The effect on spending depends on:

• the size of the change, and whether loans are fixed-rate or variable-rate
• how many households are in debt: savers, such as retired people living on interest, gain from a rise
• inflation: if prices rise faster than the rate paid, saving may still not look rewarding
• confidence: households that fear job loss may save whatever the rate

Effects on producers: save, borrow or invest

Producers save by keeping retained profit in bank deposits, borrow to expand, and invest in machinery, buildings and technology.

• Borrowing: a higher rate raises the cost of loans.
• Investing: a project is worth doing only if its expected return beats the interest charged, so fewer projects pass at higher rates.
• Saving: a higher rate raises the opportunity cost of using retained profit, because the firm could earn interest on it.

Worked example 5. A factory plans to buy a machine for 50,000 cu that is expected to add 4,000 cu to profit each year (an 8% return).

• Loan at 6%: interest is 3,000 cu, so net gain is 4,000 − 3,000 = 1,000 cu. Invest.
• Loan at 10%: interest is 5,000 cu, so net gain is 4,000 − 5,000 = −1,000 cu. Do not invest.

Higher rates therefore reduce borrowing and investment.

Evaluation points. Investment also depends on expected sales and confidence. A firm with plenty of retained profit is less sensitive to borrowing costs.

3.2.1.2 Government income and expenditure

Sources of revenue

Governments mainly raise revenue from taxes. Other sources include profits from state-owned enterprises, fees and charges, and the sale of assets. Borrowing is not revenue, because it must be repaid.

Main taxes:

• income tax, on wages and other personal income
• corporation tax, on company profits
• social insurance contributions, on earnings, to fund pensions and benefits
• sales tax or value added tax (VAT), on most goods and services
• excise duties, on specific goods such as fuel, alcohol and tobacco
• import duties (tariffs), on imported goods
• property taxes, on land and buildings

Areas of spending

Main areas are health, education, social protection (pensions and benefits), defence, transport and other infrastructure, law and order, and interest on the national debt.

Worked example 6. The table shows the budget of Country B (illustrative, in billions of cu).

Revenue	Billions	Spending	Billions
Income tax	30	Health	24
Corporation tax	12	Education	19
Social insurance contributions	14	Social protection	30
Sales tax	24	Defence	9
Excise duties	8	Transport	11
Import duties	4	Law and order	6
Other income	8	Debt interest	6
		Other	3
Total	100	Total	108

• Direct taxes on income and profit (income and corporation) are 30 + 12 = 42, or 42%. Indirect taxes (sales, excise, import) are 24 + 8 + 4 = 36, or 36%. Social insurance contributions (14) are also taken from earnings.
• Spending exceeds revenue by 108 − 100 = 8 billion. This is a budget deficit, about 7.4% of spending (8 ÷ 108), and must be financed by borrowing.
• Social protection is 30 ÷ 108 = 27.8% of spending.

Spending has an opportunity cost: more for defence means less for health unless taxes or borrowing rise.

How taxes and spending affect economic activity

Government spending adds directly to demand, for example when it pays builders to make a road. A tax cut raises disposable income and spending. A tax rise does the opposite.

Worked example 7. The 18% middle rate falls to 16%. A worker with 20,000 cu in that band pays 3,200 cu instead of 3,600 cu, a gain of 400 cu. Spending 90% of it adds 360 cu to demand.

Direct and indirect taxes

	Direct tax	Indirect tax
Paid by	The person or firm taxed on income or profit	The consumer when buying, collected by the seller
Examples	Income tax, corporation tax	Sales tax, VAT, excise, import duties
Depends on	Income or profit	Spending

If a good costs 80 cu before a 10% sales tax, the tax is 8 cu and the consumer pays 88 cu.

Progressive and regressive taxes

• Progressive tax: the share of income paid climbs as income climbs.
• Regressive tax: the share of income paid shrinks as income climbs.
• Proportional tax: takes the same percentage at every income.

Worked example 8. Country B charges income tax of 0% on the first 9,000 cu, 18% on income from 9,000 to 36,000 cu, and 38% on income above 36,000 cu.

Income	Working	Tax	Average rate
7,000	below the 9,000 threshold	0	0%
27,000	(27,000 − 9,000) × 0.18	3,240	12.0%
55,000	27,000 × 0.18 + 19,000 × 0.38 = 4,860 + 7,220	12,080	22.0%

Higher incomes face a higher average rate, which makes the tax progressive. The 38% rate applies only to the slice above 36,000 cu, not to the whole 55,000 cu.

Worked example 9. Country B charges 10% sales tax.

• Household A has an income of 18,000 cu and spends 13,200 cu (including tax) on taxable goods. The tax in that spending is 13,200 × 10 ÷ 110 = 1,200 cu, which is 6.7% of income.
• Household B has an income of 90,000 cu and spends 33,000 cu on taxable goods. The tax is 3,000 cu, which is 3.3% of income.

B hands over a larger sum yet a smaller share, so in effect the sales tax is regressive. A flat fee is regressive too: 120 cu is 1.0% of a 12,000 cu income but 0.1% of 120,000 cu.

Indirect taxes are not always regressive: a tax on luxury goods can be progressive, because mainly high-income households buy them.

Evaluating tax choices

• Progressive income tax reduces inequality but may weaken the incentive to earn more.
• Indirect taxes are cheap to collect and can discourage harmful goods, but take a bigger share of low incomes.

Common errors

• Calling a tax progressive because the rich pay more money. Compare percentages of income.
• Applying a band rate to the whole income instead of the slice inside the band.
• Treating government borrowing as revenue.
• Saying a higher rate always cuts spending. It depends on size, timing and confidence.
• Describing sharia-compliant finance as costless. The bank still earns a mark-up, rent or profit share.

Official syllabus

OxfordAQA International GCSE Economics (9214) specification, version 1.0, for exams from May/June 2025, published by OxfordAQA: sections 3.2.1.1 and 3.2.1.2.