It is the 24th of the month. Your banking app says R1,240, payday is six days away, and your child hands you a note from school: R650 for a trip, due Friday. Then your partner mentions the electricity is down to its last few units. You have not eaten out and you have not bought anything big. You have simply run a home with four people in it.
That is rarely carelessness. A budget that works for one person quietly breaks at four, because the costs do not grow in the same way. Some stay put, some multiply with every extra mouth, and some only show up once or twice a year. Sort your costs into those three groups and a family budget becomes much easier to build and much harder to knock over.
Here is the short version:
- Split your costs into fixed, per-head and yearly.
- Price food and transport from your own statements, not from a headline number.
- Turn every yearly cost into a monthly amount and move it out on payday.
- Check the plan together, once a month, for fifteen minutes.
Why does a budget for four not work like a budget for one?
Because the costs behave differently. When you were single, almost everything moved together. With a family, there are three kinds of cost, and each needs a different kind of attention.
- Fixed costs. Bond or rent, school fees once the year has started, medical aid, insurance and debt repayments. They are the same whether the month is good or bad, and they are hard to cut quickly.
- Per-head costs. Groceries, transport, data, clothing, toiletries and kids' extras. They rise with every person and with every birthday, and they are where you have day-to-day control.
- Yearly costs. School uniforms and stationery, car licence renewals and services, birthday gifts, clothing for a growth spurt, and the medical bills your scheme does not cover. They arrive once or twice a year and are the usual reason a month that looked fine on paper ends on the 24th.
Most family budgets list the first two groups and forget the third. The gap is a missing line in the plan, not a flaw in you.
What does it cost to feed four people?
The number most people reach for is the Household Affordability Index from the Pietermaritzburg Economic Justice and Dignity Group (PMBEJD). Its September 2026 release put the average household food basket at R5,488.06, up 2.0% from R5,379.42 a year earlier. That figure is real, but it is often misread. The basket is built around a low-income family of seven, it tracks 44 foods at supermarkets that target low-income shoppers, and PMBEJD itself says it is not nutritionally complete. It is not a number for a family of four.
PMBEJD also prices a basic nutritional basket, designed with a registered dietitian, by family size. In September 2026 it cost R3,807.11 for four people, R4,813.23 for five and R6,655.29 for seven. Think of R3,807 as a floor for a balanced diet at low-income-market prices, not a target. If you shop at a mainstream supermarket, buy brands or feed teenagers, your real number will be higher.
Age matters too. PMBEJD's September 2026 figures put a balanced month of food at R858.22 for a child aged 3 to 9, R932.17 for ages 10 to 13, R983.84 for a girl aged 14 to 18 and R1,106.83 for a boy of the same age. A teenage boy costs about 29% more to feed than a primary-school child, which means your food line grows as your children do, even when prices stand still.
Prices themselves are calmer than people expect. Stats SA put food and non-alcoholic beverage inflation at just 1.1% in August 2026. But individual staples swing hard: PMBEJD found onions up 66% and potatoes up 34% on a year earlier, while 30kg of maize meal was down 11%. The honest way to set your food line is to take three months of till slips or bank statements, add them up for groceries and household supplies, and use the average.
Why is your family's inflation different from the headline?
Stats SA reported annual consumer inflation of 4.4% in August 2026, up from 4.3% in July. That headline is an average across a typical basket, and your family does not spend like the average. Inside it, food rose 1.1%, but electricity, gas and other fuels rose 7.4%, transport 8.8% (with fuel up 20.0%), and primary and secondary school education 6.2% in the latest education survey. Actual rentals rose 4.1%. If you want to see where a home sits against that, how much of your income should go to rent is worth a read.
Power is a good example. Eskom's direct tariffs rose by an average of 8.76% on 1 April 2026, and its bulk tariff to municipalities rose by an average of 9.01% on 1 July. Each municipality then sets its own household tariff, so your increase will differ. If your transport line had followed the national figure, a R3,800 transport budget would now cost about R300 a month more than it did a year ago.
The lesson is not to panic. It is to review the lines that move fastest, transport, electricity and school costs, every few months instead of once a year.
What does a four-person budget look like in rands?
These numbers are illustrative, not averages. Take a household with R32,000 a month take-home, two adults and two school-age children.
- Fixed (R17,600): bond R9,500, school fees R2,500, medical aid R2,400, insurance R1,400, debt repayments R1,800.
- Per-head (R12,800): groceries R5,500, transport for two cars R3,800, electricity and water R1,600, data and streaming R900, kids' extras R1,000.
- Savings: R1,200.
That adds up to R31,600, which leaves R400 on paper and feels almost comfortable. Now add the yearly costs most people leave out: uniforms and stationery R5,000, car licences and services R6,000, clothing and shoes for four R7,200, birthdays and gifts R3,600, and medical bills the scheme does not cover R4,600. That is R26,400 a year, or R2,200 a month.
The plan is now R1,800 short every month. This is the real value of the exercise: the shortfall was always there, it was just arriving as a surprise instead of a line. Close it on purpose. In this example, planned shopping takes R600 off groceries, combining trips takes R400 off transport, a fixed kids' pot takes R300 off extras, dropping one streaming service takes R200 off data and streaming, and a prepaid-electricity routine takes R300 off power. That is R1,800, and the plan balances to the rand. It is tight, but it is a tight you can see.
For the yearly costs, set up a separate savings account and move R2,200 into it on payday. Budgeting for annual bills walks through the method, and saving for school fees covers the biggest yearly line in detail.
How do you keep a family budget working month to month?
Fix the order of things on payday. Debit orders for the fixed costs go out first, the yearly-cost transfer goes next, and the rest is yours to spend on the per-head lines. When fixed costs and the sinking fund are already paid, you have won most of the month before it starts.
Give the per-head lines a number and look at them weekly. Groceries and transport are where a month is won or lost, and a weekly glance catches drift before it becomes a shortfall. Then hold one short review a month. The 15-minute budget review routine works well for a household, and if there are two of you, budgeting as a couple covers how to agree on the big numbers.
If you also support parents or siblings, give that support its own fixed line from payday so it is planned, not negotiated at the end of the month. How to save when supporting family goes into that in more depth. Children can be part of this too. A fixed monthly amount for kids' extras, kept visible, teaches them that money is finite long before they have a salary.
How does Budget Hub help a family stay on course?
Budget Hub lets you split your spending across more than 30 expense categories, including groceries, petrol, school fees, child care, tutoring, kids' activities, clothing and medical costs, so the three groups above map onto real lines. You can also import a bank statement as a CSV to see what you actually spent on food and transport. On the free plan that is one upload a month, covering the first 50 transactions, which is enough to get your own numbers.
Savings goals take a target amount and an optional target date, and move through Bronze, Silver, Gold and Platinum levels as the goal fills up. The free plan includes three goals, which is a neat fit for school costs, yearly bills and a buffer. Your financial health score then pulls your income, spending and savings into one number with suggestions on what to look at next.
One honest note: your income and expenses are a living snapshot that you update when something changes, not a month-by-month ledger. That suits a family budget, because the point is to keep the plan current. Everything is protected with field-level encryption, and the app installs on your phone like a native app.
A family budget that fits four people
You do not have a four-person problem so much as a one-person budget stretched across four. Sort costs into fixed, per-head and yearly, price food from your own statements, and turn the yearly costs into a monthly transfer. Do that for three months and the end-of-month panic starts to ease.
Start this week. Pull your last three months of bank statements, sort every line into those three groups, and divide the yearly costs by twelve. If you want a place to keep it all current, Budget Hub was built for South African households, school notes and all.