Personal Income and Expenditure Revision Notes for Grade 10 NSC Matric Mathematical Literacy

Personal Income and Expenditure

Introduction

Understanding personal income and expenditure is essential for managing your money effectively. Personal finance involves knowing how much money you earn (income) and how much you spend (expenditure). Learning to classify different types of income and expenses helps you create realistic budgets and make informed financial decisions.

What is personal income?

Personal income is money that you receive or that comes into your possession. This money can come from many different sources and can be received in various ways.

Sources of income

People earn money through several different methods:

Employment: Many people work jobs where they receive wages or salaries from employers
Business activities: Some people produce and sell goods or services to earn profit
Investments: Money can be earned through interest on savings or rental income from property
Gifts and support: People sometimes receive money as gifts or pocket money from family

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Understanding the various sources of income helps you identify all the ways money can flow into your personal finances. This knowledge is crucial for accurate budget planning and financial forecasting.

Key income definitions

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Essential Income Terms

These definitions form the foundation of understanding different types of income sources:

Salary: A fixed amount of money paid by an employer to an employee for work completed over a longer period of time, usually per month or per year.

Wage: An amount of money paid by an employer to an employee for work completed over a shorter period of time, usually calculated by hours or days per week.

Commission: A fixed, extra amount of money paid based on an agreement for providing additional services. For example, a hairdresser might earn a basic salary plus commission for selling salon products to customers.

Study loan: A loan granted to students to help them with financial matters throughout their study period. This loan must be repaid after graduation according to specific conditions.

Bursary: Financial assistance granted to previously disadvantaged students. Bursaries are usually provided by government or large companies and do not need to be repaid.

Types of income

Income can be classified into three main categories based on how regular and predictable it is:

Fixed income

Fixed income is money that a person receives regularly without change over time. This type of income is predictable and stays the same amount each period.

Examples of fixed income:

Monthly salary from employment
Interest received from a fixed deposit account
Rental income from letting out property
Regular transport allowance

Variable income

Variable income is money that a person receives but the amount changes over time or according to different situations. This income fluctuates based on performance, usage, or market conditions.

Examples of variable income:

Sales commission (depends on how much you sell)
Interest on investments or savings (rates can change)
Profit from selling goods (depends on sales volume)

Occasional income

Occasional income is money that someone receives from time to time, but not regularly. This type of income cannot be predicted or planned for reliably.

Examples of occasional income:

Birthday or holiday gifts
Inheritance money
Bonus payments (not guaranteed)
Prize winnings

What is personal expenditure?

Personal expenditure is money that you spend on various needs and wants. Expenditure includes all the costs of living and other purchases you make.

Common types of expenditure include:

Living expenses (food, clothing, entertainment)
Accounts and bills (water, electricity, telephone)
Fees (school fees, insurance)
Taxes and loan repayments

Types of expenditure

Like income, expenditure can also be classified into three categories:

Fixed expenses

Fixed expenses are amounts of money you spend that do not change over time. These expenses stay the same each month regardless of usage.

Examples of fixed expenses:

Monthly rent or bond payments
Insurance premiums
Fixed telephone line rental
Rates and taxes

Variable expenses

Variable expenses are amounts of money you spend that change over time based on your usage or consumption. These expenses fluctuate month to month.

Examples of variable expenses:

Grocery shopping
Electricity and water bills
Petrol costs
Telephone usage charges

Occasional expenses

Occasional expenses are expenses that you cannot always plan for. These are unexpected costs that arise from time to time.

Examples of occasional expenses:

Medical bills
Car repairs
Emergency purchases
Annual services

Budget planning

Budget: A plan of action to balance your expenditure with your income. Budgets are usually displayed as tables showing income items in one column and expenditure items in another column.

A good budget helps you:

Track where your money comes from and where it goes
Plan for future expenses
Save money for emergencies
Avoid spending more than you earn

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When creating a budget, it's important to prioritise your expenses. Essential needs like food and shelter should come before wants like entertainment. If you're running low on money at the end of a month, buying food is more important than buying music or cinema tickets.

Debt: The amount of money owed to others. Debt occurs when your expenditure exceeds your income over time.

Worked example 1: Classifying income

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Worked Example: Classifying Income Types

Question: Mr Sibong works as a sales manager and receives different types of income. Classify each income source as fixed, variable, or occasional:

Salary: R15,000 per month
Interest from fixed deposit account: R200 per month
Rental income from flat: R3,500 per month
Annual bonus: R8,000 (when company performs well)
Cash gifts from friends: Varies
Sales commission: Depends on monthly sales
Transport allowance: R800 per month

Solution:

Income Source	Fixed	Variable	Occasional
Salary	✓
Interest from fixed account	✓
Rental income from flat	✓
Annual bonus			✓
Cash gifts from friends			✓
Sales commission		✓
Transport allowance	✓

Worked example 2: Calculating monthly income

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Worked Example: Monthly Income Calculation

Question: You work at a restaurant with the following shifts per month:

4 Friday shifts × 5 hours at R20 per hour
4 Saturday shifts × 10 hours at R30 per hour
2 Sunday shifts × 8 hours at R40 per hour
Estimated tips = 1.5 × monthly salary

Calculate your total monthly income.

Solution:

Step 1: Calculate Friday earnings

$4 \times 5 \times R20 = R400$

Step 2: Calculate Saturday earnings\

$4 \times 10 \times R30 = R1,200$

Step 3: Calculate Sunday earnings

$2 \times 8 \times R40 = R640$

Step 4: Calculate total salary

$R400 + R1,200 + R640 = R2,240$

Step 5: Calculate tips

$\text{Tips} = 1.5 \times R2,240 = R3,360$

Step 6: Calculate total monthly income

$\text{Total income} = R2,240 + R3,360 = R5,600$

Worked example 3: Budget allocation

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Worked Example: Budget Percentage Allocation

Question: If you earn R1,200 per month, calculate how much you would spend on each category using these percentages:

Category	Percentage
Clothes	30%
Entertainment	10%
Savings	10%
Charitable organisations	25%
Transport	12%
Sweets and cool drinks	13%

Solution:

Clothes: $30% \text{ of } R1,200 = 0.30 \times R1,200 = R360$
Entertainment: $10% \text{ of } R1,200 = 0.10 \times R1,200 = R120$
Savings: $10% \text{ of } R1,200 = 0.10 \times R1,200 = R120$
Charitable organisations: $25% \text{ of } R1,200 = 0.25 \times R1,200 = R300$
Transport: $12% \text{ of } R1,200 = 0.12 \times R1,200 = R144$
Sweets and cool drinks: $13% \text{ of } R1,200 = 0.13 \times R1,200 = R156$

Total: $R360 + R120 + R120 + R300 + R144 + R156 = R1,200$ ✓

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Key Points to Remember:

Income classification: Fixed income stays the same, variable income changes with circumstances, and occasional income happens irregularly
Expenditure classification: Fixed expenses remain constant, variable expenses change with usage, and occasional expenses are unexpected costs
Budget planning: A good budget balances income and expenditure, helping you avoid debt and save money
Prioritise expenses: Essential needs like food and shelter should come before entertainment and luxury items
Monitor regularly: Track your income and expenses monthly to stay in control of your finances

Personal Income and Expenditure (Grade 10 NSC Matric Mathematical Literacy): Revision Notes