AS Brokers Insight · The Retirement Income Problem

The Inflation Illusion: Why South Africa's Official Numbers Don't Match Your Bank Statement

An investigation into what the Consumer Price Index actually measures — and why your wallet, your medical aid statement, and your shopping receipts tell a very different story.

What the official inflation figure is built on

Every month, Statistics South Africa (Stats SA) publishes a headline Consumer Price Index (CPI) figure that gets splashed across newspapers and quoted by the Reserve Bank. In March 2026, that figure was 3.1%. Through 2025 it averaged around 3.2%. On paper, inflation looks well under control — sitting comfortably inside the South African Reserve Bank's 3% to 6% target band.

But ask anyone who pays a monthly medical aid premium, fills up at the pumps, or does the weekly grocery run, and you'll get a very different answer. So where does the disconnect come from?

The CPI is calculated by tracking the price changes of a fixed "basket" of goods and services representative of what the average South African household buys. The current basket — updated in January 2025 — contains 391 products and services, built on data from the 2022/23 Income and Expenditure Survey and rebased to December 2024 = 100.

What is inside the basket

The basket is divided into major categories, each carrying a weight that reflects its proportional importance in the average household's spending. Below is what drives the 2025 update.

Category	Weight in CPI
Housing & Utilities	24.1%
Food & Non-Alcoholic Beverages	18.2%
Transport	13.9%
Insurance & Financial Services	10.4%
Miscellaneous Goods & Services	9.4%
Health	~5.5%
Information & Communication	5.5%
Alcoholic Beverages & Tobacco	4.6%
Clothing & Footwear	3.9%
Education	~3.2%
Recreation, Sport & Culture	~2.8%
Restaurants & Hotels	~2.5%

Source: Statistics South Africa, CPI basket weights, January 2025 update.

The reality gap: where your money actually goes

The headline number is a weighted average. It is mathematically honest and it is also, for most middle-income South African households, a poor description of the actual cost of living. Four categories explain almost all of the gap between the official figure and what you experience.

Fuel: the great cost multiplier

Transport (13.9% of the basket) includes fuel, with the fuel component alone weighted at roughly 3.9% to 4.4% of the total basket. When petrol and diesel prices fell through most of 2024 and early 2025, transport became a negative contributor to inflation, actively pulling the headline down. In October 2024, transport fell 5.3% year-on-year and subtracted 0.8 of a percentage point from the headline rate.

This creates an optical illusion of affordability. Fuel prices are highly volatile and politically managed through levies. When they fall, the CPI looks healthy. When they spike — as they did in April 2026 when petrol rose by more than R3 per litre — the damage to household budgets is immediate, long before the next CPI release captures it. Fuel is also a cost multiplier: higher diesel feeds into the cost of moving food from farms to shelves, manufacturing inputs, and virtually every physical good in the economy.

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Medical aid: an inflation category of its own

Medical aid contributions have risen far above CPI every single year for more than a decade. In 2024, major schemes raised premiums between 8% and 13%, with the weighted average across leading providers sitting around 10.3%. In 2025, increases reached as high as 12.75% on some plans, with Discovery, Bonitas, and Momentum all announcing double-digit hikes against a CPI sitting around 3% to 4%.

The Council for Medical Schemes recommended that schemes limit 2025 increases to between 6.4% and 7.9%. Almost every major scheme exceeded that recommendation. Discovery itself has noted that global medical inflation is estimated to exceed CPI by 6.4% annually. For working South Africans spending R4,000 to R10,000 a month on medical aid alone, this is not a rounding error — it is a structural drag on the household budget that the headline number simply does not see.

Short-term insurance: the hidden double-digit increase

Car insurance, household contents, and home owner cover have all been climbing steeply. Gross written premiums in South Africa's short-term insurance industry grew 9.7% in 2022 alone. Industry voices at Santam and Momentum have warned consumers to expect 10% to 15% increases across motor and household policies.

The drivers are structural: vehicle theft and accident rates have pushed claims higher; imported parts become more expensive when the rand weakens; climate events like the 2022 KwaZulu-Natal floods devastated reinsurance capacity; load shedding caused widespread appliance and electrical claims; and reinsurance premiums tripled in some categories.

None of these structural drivers are captured cleanly in CPI's single blended insurance line. Yet for a middle-class household running two cars, a house, and home contents cover, insurance across all policies can easily consume R3,000 to R5,000 per month — and that bill grows at two to three times the headline rate.

Food: officially moderate, experientially brutal

Food and non-alcoholic beverages carry an 18.2% weight, up from 17.1% in the previous revision — an acknowledgement that South Africans are spending more on food in relative terms. Official food inflation in early 2025 ranged from 2.7% to 4.0% year-on-year.

But those averages conceal enormous variation. Instant coffee rose 19% to 20% year-on-year. Beef prices climbed 13.5% in January 2026 amid foot-and-mouth disease supply disruptions. Maize at farm level recorded annual inflation of 64.7% at one point in early 2025. Eggs, bread, and cooking oil — the staples that anchor household budgets — have seen cumulative five-year increases that dwarf the annual headline figures. The basket also measures a representative average, not your specific shopping list.

Electricity and municipal costs: the steady bleed

Housing and utilities make up the largest basket weight at 24.1%, but the headline contribution can look deceptively modest because owners' equivalent rent — an imputed, theoretical figure for what homeowners "would pay" if they rented — dilutes the real-world impact of actual municipal cost increases.

Electricity charges and municipal services (water, rates, refuse) have consistently risen above general CPI. In the year to April 2025, electricity charges rose 11.6% year-on-year. For homeowners in major metros, annual rates increases of 5% to 8% plus water and sanitation hikes are routine — yet they sit inside a 24% weighted category alongside theoretical rent values, meaning the real cost of living in your house is significantly understated.

"No single consumer experiences average inflation. The CPI can be technically accurate and deeply misleading at the same time — it depends entirely on who you are."

Why the gap exists: the structural limits of any CPI

It would be unfair to accuse Stats SA of fabricating numbers. The CPI is technically sound and aligned with international standards. But there are inherent limitations to what any single inflation index can represent.

1
It measures the average, not you

A household in the top 20% by income spends a very different share of money on medical aid and insurance than one in the bottom 40%. The basket cannot reflect both experiences accurately.
2
The weights lag reality

The current basket is built on 2022/23 expenditure data. In an economy moving as fast as South Africa's, even a two-year lag means the weights may no longer reflect current spending priorities.
3
Volatile items create noise

Fuel prices can swing 10% to 15% in a single month. When they fall sharply they can drag the headline number down, masking persistent inflation elsewhere. Core inflation (which strips out food, fuel, and energy) ran at 3.0% to 3.4% in early 2025 — but the components excluded are the ones most people feel most acutely.
4
The informal economy is largely invisible

Roughly 43% of South Africa's fast-moving consumer goods trade happens through spaza shops, street traders, and township stores. Stats SA prices are collected primarily from formal retail outlets — leaving the most vulnerable consumers structurally under-represented.
5
Insurance is calculated on a net basis

The CPI deducts claims paid back to policyholders when calculating the insurance component. For policyholders who go years without claiming, the actual premium burden is significantly higher than the CPI registers.
6
It cannot see service-quality degradation

When a medical scheme raises premiums 10% and simultaneously cuts benefits, the CPI captures only the price change, not the decline in what that price buys you. In real-world terms that is inflation — and the index is blind to it.

Work out your personal cost-of-living gap

The fastest way to see the illusion at work in your own life is to compare the headline number against your actual annual increases on medical aid, short-term insurance, school fees, and municipal costs. The calculator below gives you a structured starting point. Use it as a conversation tool, not a financial plan — and bring the results to an AS Brokers adviser for a proper review.

Can the CPI be trusted?

The honest answer: yes, as a macroeconomic tool — with important caveats. The CPI is a legitimate, internationally benchmarked measure of average price changes. It is properly used to guide monetary policy, index social grants and bonds, track trends in the general price level, and compare South Africa to other economies.

Where it fails as a measure of personal financial reality is in its design as an average. Your personal inflation rate is determined by your income, lifestyle, location, health status, and the specific goods and services you consume.

For a middle-class household spending heavily on medical aid, private schooling, motor and household insurance, security, and a modern vehicle — all of which inflate above the headline rate — a personal inflation rate of 7% to 10% per year is entirely plausible at a time when official CPI sits at 3%. For a low-income household where fuel and food dominate, the collapse in fuel prices through 2024 may have genuinely delivered relief close to what the headline suggested. This is the inequality hidden inside a single number.

What a better picture would look like

Income-disaggregated CPIs. Separate inflation baskets for different income quintiles exist in academic work but are not published monthly. They should be.
An official medical inflation index. South Africa does not have one. The Council for Medical Schemes uses CPI as a proxy, even as the industry insists medical inflation runs structurally higher.
More frequent basket updates. The Income and Expenditure Survey runs roughly every five years. In a fast-changing economy that lag is too long.
Better informal-economy data. Incorporating spaza shop and informal market pricing would give a truer picture of what most South Africans actually pay.

Common questions

If the CPI is so misleading, why does the Reserve Bank still use it?

Because the CPI is doing the job it was designed to do: measuring average price changes across the whole economy for monetary policy purposes. The problem is not the index — it is the assumption that one national average can describe every household's reality.

Why does my medical aid increase so much more than inflation every year?

Medical inflation behaves differently from general inflation. It is driven by aging populations, higher claims utilisation, new medical technology, global pharmaceutical prices, and the structural economics of private healthcare. Globally, medical inflation is estimated to run roughly 6.4% above CPI.

Should I use the headline CPI to plan my retirement income?

Only as a starting point. Most retirees spend a disproportionate share on medical aid, insurance, and household services — all of which inflate well above CPI. A retirement income plan built only on the headline rate tends to understate the income required to maintain the same standard of living over time.

What can I do to protect myself from above-CPI cost pressures?

Track your personal inflation rate annually, stress-test your plan against a higher inflation assumption (typically 6% to 8% for middle-income households), review insurance and medical aid options every year, and have your portfolio reviewed by a qualified adviser so that growth, liquidity, and tax efficiency are working together.

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