OxfordAQA International GCSE Economics: Interest rates, revenue and taxation (9214) – Revision Notes

These notes condense sections 3.2.1.1 and 3.2.1.2 of the OxfordAQA International GCSE Economics (9214) specification, version 1.0, for exams from May/June 2025. For full explanations and worked examples, use the study guide. When you are ready to test yourself, try the practice questions, the free 10-minute diagnostics, the course hub and the printable checklist. The next sub-topic is government objectives. All figures are invented.

Key definitions

Term	Meaning
Interest rate	What borrowing costs and what saving earns, as an annual percentage
Producers	Firms that make goods or provide services
Government revenue	Money the government receives, mainly from taxes
Direct tax	Charged on what a person or firm earns, and paid by that taxpayer
Indirect tax	Tax on spending, paid by the buyer and collected by the seller
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
Budget deficit	Spending greater than revenue, financed by borrowing

Formulas and rules

Item	Rule
Interest for one year	sum × rate
Average tax rate	tax paid ÷ income × 100
Tax with bands	rate × only the slice of income inside each band, then add
Tax share of income	tax ÷ income × 100
Tax inside a price that includes a rate r	price × r ÷ (100 + r)
Deficit	spending − revenue

Interest rates in steps

Consumers.

If the rate rises	Effect
Saving	More attractive: higher reward and a higher opportunity cost of spending
Borrowing	Dearer: fewer loans and mortgages; variable-rate borrowers pay more
Spending	Tends to fall: more saving, less borrowing, less income left after interest

A fall in the rate pushes each of these the other way.

Producers.

If the rate rises	Effect
Saving	Retained profit earns more in a deposit, so keeping cash is more attractive
Borrowing	Loans cost more, so firms borrow less
Investing	Fewer projects earn more than the interest charged, so investment falls

Method for an investment decision.

1. Work out the expected return: extra annual profit ÷ cost × 100.
2. Work out the interest cost: loan × rate.
3. Compare. Invest if the return is above the interest rate (or the profit exceeds the interest).

Worked reminder. A firm spends 30,000 cu on equipment that adds 2,100 cu to annual profit. The return is 2,100 ÷ 30,000 = 7%. A loan at 5% costs 1,500 cu, leaving a net gain of 600 cu, so it invests. At 8% the cost is 2,400 cu, so it does not.

Chain for a longer answer. Rate rises → borrowing is dearer and saving is rewarded → households and firms spend and invest less → total demand falls → output and prices grow more slowly. Then evaluate (see below).

Sharia-compliant alternatives

Islamic finance does not allow riba, a fixed charge for lending money. The return is linked to trade, an asset or profit.

Form	One-line summary
Mudarabah	Funds from one party, management by the other; profit split in an agreed ratio
Musharakah	Both put in funds; profit shared by agreement, losses by contribution
Murabaha	Bank buys the item and sells it on at cost plus a disclosed mark-up, paid in instalments
Ijara	Bank owns the asset and charges rent
Sukuk	Certificates giving a share in an asset and its income

Worked reminder. A bank buys equipment costing 20,000 cu and sells it to a firm at a 5% mark-up: 20,000 × 1.05 = 21,000 cu, so the mark-up is 1,000 cu. It is agreed at the start, whatever happens to market rates later.

Point to make. Sharia-compliant finance is not free: the provider still earns a mark-up, rent or profit share. Because providers may still price with an eye on market rates, a rate rise can still reduce the demand for finance.

Government revenue and spending

• Revenue: income tax, corporation tax, social insurance contributions, sales tax or VAT, excise duties, import duties, property taxes, plus state-enterprise profits, fees and asset sales.
• Borrowing is not revenue. It is how a deficit is financed.
• Spending: health, education, social protection (pensions and benefits), defence, transport and infrastructure, law and order, debt interest.
• Every spending choice has an opportunity cost.
• Spending adds to demand. A tax cut raises disposable income and so spending. A tax rise reduces them.

Direct against indirect, progressive against regressive

	Direct	Indirect
Examples	Income tax, corporation tax	Sales tax, VAT, excise, import duties
Based on	Income or profit	Spending
Collected from	The taxpayer, often through employers	The seller, who adds it to the price
Usual effect	Often progressive	Tends to be regressive

Worked reminder (bands). Country E charges 0% on the first 5,000 cu and 25% above. On 15,000 cu the tax is (15,000 − 5,000) × 0.25 = 2,500 cu, an average rate of 16.7%. On 45,000 cu it is 40,000 × 0.25 = 10,000 cu, or 22.2%. Higher income means a higher average rate, so it is progressive.

Worked reminder (regressive). A tax takes 600 cu from an income of 10,000 cu (6%) and 2,400 cu from an income of 80,000 cu (3%). The higher earner pays a larger sum yet a smaller share, so it is regressive.

Worked reminder (sales tax). A 15% sales tax on a 60 cu item adds 9 cu, so the price is 69 cu.

Must-know distinctions

• Progressive or regressive is about percentages of income, not amounts of money.
• Marginal rate (on the next slice of income) is not the average rate (tax ÷ total income).
• Direct or indirect is about who is taxed and on what, not who is richer.
• Revenue is not borrowing. A deficit is spending minus revenue.

Evaluation prompts

• Interest rate effects depend on the size of the change, fixed or variable loans, confidence, inflation, and how much debt households and firms hold.
• Savers, such as retirees living on interest, gain from higher rates while borrowers lose.
• Investment also depends on expected sales and confidence.
• Progressive taxes reduce inequality but may weaken incentives and invite avoidance.
• Indirect taxes are cheap to collect and can discourage harmful goods, but weigh more on low incomes.

Quick self-test

1. Define an interest rate.
2. Find the simple interest on 3,000 cu at 4% for one year.
3. A borrower owes 6,000 cu at 7%. Find the interest for one year.
4. A bank pays savers 2% and charges borrowers 6%. On 5,000 cu, find the difference in interest per year.
5. Name two sharia-compliant forms of finance.
6. Country E charges 0% on the first 5,000 cu and 25% above. Find the tax and the average rate on 15,000 cu.
7. A 15% sales tax is added to a 60 cu item. State the price paid.
8. A tax takes 6% of an income of 10,000 cu and 3% of an income of 80,000 cu. Is it progressive or regressive?
9. A project costs 30,000 cu, adds 2,100 cu to annual profit and is funded by a 5% loan. Calculate the net gain.
10. A household borrows 60,000 cu. The rate rises from 4% to 5.5%. Find the extra interest per year and per month.
11. Revenue is 40 and spending is 46. State the deficit.
12. Give one reason why a rise in interest rates may not reduce spending much.

Answers

1. What it costs to borrow and what a saver earns, stated as an annual percentage of the sum.
2. 3,000 × 0.04 = 120 cu.
3. 6,000 × 0.07 = 420 cu.
4. Saver earns 5,000 × 0.02 = 100 cu; borrower pays 5,000 × 0.06 = 300 cu; difference = 200 cu.
5. Any two of mudarabah, musharakah, murabaha, ijara, sukuk.
6. Tax = 10,000 × 0.25 = 2,500 cu. Average rate = 2,500 ÷ 15,000 = 16.7%.
7. 60 × 0.15 = 9, so 69 cu.
8. Regressive: the percentage falls as income rises.
9. Interest = 30,000 × 0.05 = 1,500 cu. Net gain = 2,100 − 1,500 = 600 cu.
10. Interest at 4% = 2,400 cu and at 5.5% = 3,300 cu. Extra = 900 cu a year, or 75 cu a month.
11. 46 − 40 = 6.
12. Any one: the rise is small; most loans are fixed-rate; households are confident; savers gain; inflation keeps the real rate low.

Where marks are usually lost

• Writing that “the rich pay more” to justify progressive, instead of comparing percentages.
• Taxing the whole income at the top band rate.
• Giving a one-step answer (“people borrow less”) with no link to spending or output.
• Treating a rise in rates as having one effect on everyone, with no mention of savers.
• Leaving out units or the word “per year” in interest calculations.
• Describing sharia-compliant finance as having no return for the lender.
• Listing taxes with no distinction between direct and indirect.
• Calling borrowing a source of revenue.
• Finishing an evaluation question with a summary and no judgement.

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.