Investment Risk and Return: How Much Should You Take?

What Investment Risk Actually Is

Ask most people to define investment risk and they will describe volatility — the fact that markets fall as well as rise, sometimes sharply. That is part of it, but it is the least important part for anyone investing over a meaningful time horizon.

Volatility is uncomfortable, but it is not the same as loss. A diversified portfolio that falls 20% in a bad year and recovers over the following two has been volatile. It has not lost you anything permanent unless you sold at the bottom. The investor who panicked and switched to cash turned a temporary decline into a permanent one. The investor who stayed invested experienced volatility but no loss. Same portfolio, very different outcomes — and the difference was behaviour, not the market.

The risks that genuinely matter are quieter and more permanent. There is the risk of permanently losing capital — through a concentrated bet that fails, an investment you do not understand, or selling at the wrong time. And there is the risk that does the most damage of all, precisely because it does not feel like risk: the slow erosion of purchasing power by inflation. Money sitting in cash feels safe. Over twenty years, at South African inflation rates, it is one of the most reliable ways to go backwards in real terms.

So the working definition we use is this: risk is the chance of not having enough, in real terms, when you need it. That reframing changes everything that follows, because it means the genuinely risky strategy for a long-term investor is often the one that feels safest.

Risk and Return Are Two Sides of One Coin

The central fact of investing is that return is the compensation you receive for taking risk. They are not two separate things you can optimise independently. If an investment offers a higher expected return, it is because it carries more risk — more uncertainty about the outcome, more short-term volatility, or a greater chance of loss. There is no exception to this, and any product that appears to offer one should be treated with suspicion.

This is why we frame return expectations in real terms, as “CPI plus” a margin, rather than as a single nominal number. A nominal return of 11% sounds impressive until you learn inflation was 9%; it sounds disappointing until you learn inflation was 3%. Only the real return — the margin above inflation — tells you whether your capital is actually growing in purchasing power, and the size of that margin is directly linked to how much risk you have taken to earn it.

The practical implication is that the question is never “how do I get the highest return?” It is “how much real return do I actually need to meet my goals, and what is the least risk I can take to get there reliably?” Taking more risk than your plan requires is not prudent — it exposes you to volatility and potential loss you did not need. Taking less risk than your plan requires is the more common and more dangerous error, because it quietly guarantees a shortfall.

The Asset Classes and Where They Sit

Every portfolio is built from a handful of building blocks, and each sits at a different point on the risk-return spectrum. The return expectations below are long-term, real (above inflation) targets — not promises, and certainly not what any single year will deliver. They are the reasonable compensation each asset class has historically offered for the risk it carries.

Two things stand out. First, equities — local and global — are where the real growth comes from. Over long periods, nothing else has reliably delivered the CPI + 7% needed to build and preserve wealth across decades. Second, the assets that feel safest, cash and bonds, deliver the lowest real returns precisely because they carry the least short-term risk. You are not being rewarded for safety; you are paying for it.

This is also where the case for a strong offshore allocation comes in. South Africa represents under 1% of global market capitalisation, and the JSE is heavily concentrated in a small number of sectors and stocks. A portfolio invested only in local assets is taking a large, undiversified bet on a single small economy and a single currency. That is concentration risk, and it is one of the most common — and least recognised — risks in South African portfolios. We treat offshore exposure as a core pillar rather than an optional tilt, which we cover in detail in our offshore investing guide.

From Return Target to Equity Allocation

Here is where the abstract becomes practical. Because return is compensation for risk, the real return you target dictates how much of your portfolio must sit in growth assets — principally equities. You cannot target a high real return while holding mostly cash and bonds; the maths does not allow it. The table below maps return targets to the equity exposure and the type of investor each suits.

The trade-off is unavoidable and worth stating plainly: a higher real-return target means more equity, which means more short-term volatility. A CPI + 7% portfolio will have years where it falls 20% or more. That is not a flaw in the strategy — it is the price of admission for the return. The investor who wants the return but cannot tolerate the volatility is asking for something that does not exist, and the honest answer is to either lower the return target or extend the time horizon until the volatility stops mattering.

This is also why time horizon is so central. Volatility is a serious risk over one or two years and an almost trivial one over twenty. The longer your money can stay invested, the more equity you can — and usually should — hold, because you have the time to ride out the downturns that would force a shorter-term investor to sell at the wrong moment.

The Cost of Taking Too Little Risk

The risk everyone worries about is losing money in a crash. The risk almost nobody discusses is the opposite one: taking too little risk, earning a real return below what your plan needs, and arriving at — or moving through — retirement with too little. It never feels like risk, because nothing dramatic happens. There is no crash to point to, no bad day on the news. The capital simply grows too slowly, and you find out far too late. For many investors it is the more damaging error, and the numbers make the point better than words.

Before retirement: the cost of three percentage points

Take R1,000,000 invested for 20 years, with inflation steady at 5% throughout. Compare a conservative portfolio targeting CPI + 2% (a 7% nominal return) with a growth-tilted one targeting CPI + 5% (a 10% nominal return). Three percentage points a year does not sound like much.

Over twenty years, three percentage points a year nearly doubles the outcome. In purchasing power — the only measure that matters — the conservative portfolio turned R1m into roughly R1.46m in today’s money, while the growth-tilted one turned it into about R2.54m, around 74% more, from the same starting capital over the same period. The investor who chose the “safe” 7% portfolio did not avoid risk. They accepted a near-certainty of substantially less money, in exchange for a smoother ride they may not have needed.

In retirement: the cost of running out

This is where the under-discussed risk bites hardest. Consider a retiree with R10,000,000 drawing R500,000 in the first year — a 5% starting drawdown — and increasing that income each year with inflation. The only question that matters is how long the capital lasts.

Same starting capital, same income. The conservative portfolio runs dry at about age 90 — uncomfortably close for anyone in good health with longevity in the family. The growth-tilted portfolio sustains the same inflation-linked income essentially indefinitely. For a retiree, the over-cautious portfolio is not the safe choice; it is the one carrying the real risk of running out of money in the years you can least afford to.

None of this means more risk is always better. The growth-tilted portfolio will be more volatile, and for a retiree drawing an income, sequence-of-returns risk — covered next — means the early years carry outsized weight. The point is narrower and important: risk runs in both directions. Taking too much is a genuine danger; so is taking too little, and the second is far less discussed precisely because its damage is slow and quiet. The right amount of risk is the amount your plan requires — no more, and crucially no less.

These illustrations assume constant 5% inflation and steady annual returns for simplicity. Real markets are far lumpier — which is the subject of the next section — so they are for illustration, not projection.

The Other Risks Worth Understanding

Shortfall risk, set out above, is the one investors underestimate most. Three others do real damage and deserve the same attention as the short-term volatility everyone already worries about.

Sequence-of-returns risk

For anyone drawing an income from a portfolio, the order of returns matters as much as the average. Two retirees with identical average returns over twenty years can have completely different outcomes depending on when the bad years fall. Poor returns in the first few years of retirement, combined with ongoing withdrawals, do damage that later good years cannot fully repair, because the withdrawals are coming off a shrinking base. This is the single most important risk in retirement income planning, and it is why we build cash buffers and manage drawdown carefully for clients in or near retirement.

Concentration risk

Holding too much of one thing — one stock, one sector, one country, or one currency. A portfolio invested only in South African assets is concentrated whether or not it holds many funds, because those funds are all exposed to the same small economy and the same currency. Genuine diversification means spreading risk across asset classes, geographies, and currencies that do not all move together.

Behavioural risk

The risk you pose to your own portfolio. Most investors underperform the very funds they hold — not because the funds were bad, but because they bought after good runs and sold after bad ones, repeatedly. Panic selling, performance chasing, and reacting to short-term noise quietly destroy more wealth than any market crash. This is the least technical risk and the most expensive, and managing it is a large part of what an advisor is actually for.

How We Build Portfolios as a Result

Everything above points toward a set of principles. None of them is exotic. The value is in applying them consistently, especially when markets make it uncomfortable to do so.

Start with the plan, not the product. The portfolio exists to serve a financial plan — a specific goal, time horizon, and income need. The return target comes from the plan, and the asset allocation comes from the return target. Building a portfolio first and fitting a goal to it afterwards is backwards, however common it is.

Let asset allocation do the heavy lifting. The split between growth and defensive assets, and across geographies and currencies, drives the overwhelming majority of both your return and your risk. Manager and fund selection matter, but they are second-order decisions made within an allocation, not substitutes for getting the allocation right.

Diversify across what actually differs. Holding ten funds that all invest in the same market is not diversification. Spreading capital across asset classes, regions, and currencies that behave differently is. Offshore exposure is central to this for South African investors, not peripheral.

Use a core-and-satellite structure. The bulk of a portfolio — the core — should be broad, low-cost, and stable, blending active and passive where each earns its place. A smaller satellite allocation can hold more specific or thematic positions where there is genuine conviction. We are not ideological about active versus passive; we use whichever adds value net of fees in a given area.

Mind the fees, because they compound against you. Costs are one of the few certainties in investing, and they compound over decades just as returns do. A 0.5% annual fee difference on R10 million over twenty years is roughly R1.5 million of your money. We manage total investment charges actively and quantify them in rand terms, because abstract percentages hide how much is at stake.

Rebalance with discipline. Over time, the winners grow and the losers shrink, and a portfolio drifts away from its intended allocation. Rebalancing — trimming what has run and adding to what has lagged — is uncomfortable precisely because it means selling your best performers. It is also one of the few reliable ways to systematically buy low and sell high.

Manage behaviour above all. The best-constructed portfolio fails if its owner abandons it at the bottom of a market. Staying invested through volatility, resisting the urge to chase performance, and keeping focused on the plan rather than the headlines is where most of the real return is won or lost.

Matching the Portfolio to the Person

A sound framework still has to be fitted to a real person, and that means reconciling three things that rarely line up neatly.

The first is your risk requirement — the real return your plan actually needs, which dictates a minimum level of growth assets. The second is your risk capacity — how much risk your circumstances can genuinely absorb, driven by your time horizon, your income, and how dependent you are on the capital. The third is your risk tolerance — how much volatility you can live with emotionally without making poor decisions.

When these align, the portfolio is straightforward. The interesting work is when they conflict. A retiree may need a CPI + 5% return to fund a thirty-year retirement (high requirement) but feel deeply uncomfortable watching their capital swing (low tolerance). Lowering the equity exposure to suit their nerves may quietly guarantee they run out of money. The answer is rarely to simply defer to the questionnaire result — it is to have an honest conversation about the trade-off, often combined with structural fixes like a cash buffer that lets the growth assets do their work without the retiree having to sell into a downturn.

This reconciliation is not something a generic risk-profiling questionnaire can resolve. It is a planning conversation, and it is the point at which an understanding of risk and return stops being theory and starts shaping a real portfolio.