A salary slip can be confusing. The amount you agreed to and the amount that lands in your bank account are often quite different. A monthly budget starts with the second number, and this guide walks through how to build one, step by step, using a worked example in rands.
This article is for general education only. It is not personalised financial advice, and no budget can guarantee a particular result.
Step 1: Start with your take-home pay
Your gross salary is what your employer agrees to pay before deductions. Your net salary (take-home pay) is what reaches your account after PAYE income tax, UIF contributions and any pension, provident fund or medical aid deductions.
Use the net figure for budgeting, because it is the only money you can actually spend. If your income changes from month to month, use your lowest recent month as the baseline and treat anything extra as a bonus to allocate later.
Step 2: List your fixed costs
Fixed costs are the bills that stay roughly the same each month. Check your bank statements for the last two or three months and list:
- Rent or bond repayment
- Vehicle instalment and insurance
- Transport (taxi fare, petrol, e-hailing)
- Cellphone contract and data
- Electricity (prepaid average or municipal account)
- Insurance, funeral cover and school fees
- Debt repayments, such as store accounts or personal loans
Step 3: Estimate your variable costs
Variable costs change month to month. Groceries are the largest for most households, followed by eating out, airtime, clothing, toiletries and entertainment. Use your statements to find an honest monthly average. Rounding down to be optimistic is the most common reason budgets fail.
Step 4: Set aside savings first
Many people save whatever is left at month-end, and often nothing is left. An alternative is to treat savings like a bill: decide an amount, move it on payday, and budget with the rest. Common starting points are an emergency fund and a small, regular amount toward a goal. The right amount depends on your circumstances, so start with something you can sustain.
A worked example: R18,000 take-home pay
Here is an illustration for a fictional single person renting in a metro area. The numbers are examples only, and your own figures will differ.
| Category | Amount |
|---|---|
| Rent | R6,000 |
| Electricity and water | R900 |
| Transport (fuel, e-hailing) | R2,000 |
| Groceries | R3,000 |
| Cellphone and data | R600 |
| Insurance and funeral cover | R700 |
| Debt repayment (store account) | R800 |
| Eating out and entertainment | R800 |
| Savings (emergency fund) | R1,800 |
| Miscellaneous and buffer | R1,400 |
| Total | R18,000 |
The categories add up to exactly the take-home pay. This is the idea behind a zero-based budget: every rand has a job, including the rand you leave unspent as a buffer.
Notice the proportions. Housing and transport together take R8,000, about 44% of income. Savings are R1,800, or 10%. Some people use guides such as the 50/30/20 rule (needs, wants, savings) as a rough reference, but in South Africa housing and transport frequently push “needs” higher, so treat any rule as a starting point rather than a target.
Step 5: Track, then adjust
A budget is a plan; tracking tells you whether the plan matches reality. Review your spending weekly for the first few months. If groceries run at R3,600 instead of R3,000, you have two options: raise that line and reduce another, or look for ways to spend less. Either is fine, as long as the total still matches your income.
Handle irregular costs
Annual expenses such as licence renewals, school uniforms, insurance renewals and December spending can derail a monthly budget. Divide each by twelve and set that amount aside monthly. A R3,600 yearly cost becomes R300 a month.
Common mistakes to avoid
- Budgeting with gross pay instead of net pay
- Forgetting small, recurring debits such as subscriptions and bank fees
- Having no buffer line for the unexpected
- Making the budget so strict it cannot be kept
- Never reviewing it after the first month
Put it into practice
You can build this on paper or in a spreadsheet. If you would like a ready-made structure, the WealthSteps Budget Planner lays out income, fixed costs, variable costs and savings on your phone, in rands.
Start with one month. Write down your take-home pay, list your costs honestly, and give every rand a job. You can refine it as you learn where your money really goes.
Disclaimer: WealthSteps SA provides educational content only. Nothing here is financial, tax or investment advice. Consider speaking to a registered financial services provider about your personal situation.