Most investors don’t wake up one morning and decide to sabotage their financial plan; they simply make a series of sensible, conservative choices that feel prudent in the moment. They keep more money in cash ‘until things settle down’, they avoid market exposure because markets feel unpredictable, and they gravitate toward the comfort of capital certainty because certainty feels like safety. In practice, though, the biggest threat to long-term financial security is often not market volatility, but the steady, compounding erosion of purchasing power that comes from earning returns that fail to keep pace with inflation.

Inflation is often described as a percentage on a chart, but in real life, it appears in more tangible ways, such as school fees that rise faster than expected, medical aid premiums that keep ramping up, the grocery bill that no longer resembles last year’s budget, and the unsettling realisation that the same retirement income buys less each year. When we talk to clients who consider themselves ‘low risk’, the conversation typically revolves around not losing money. However, the more important question is whether their money is quietly losing its function. Remember, a portfolio that never drops in value on paper can still fail, simply because it cannot maintain the lifestyle it was meant to support.

The difference between volatility risk and outcome risk

While very often discussions tend to focus on volatility risk – how much your portfolio might fluctuate month to month – keep in mind that this is only one dimension of risk. The more consequential form of risk is outcome risk, which is the risk of not meeting your objective, whether that objective is retiring with dignity, funding education, sustaining an income in later life, or maintaining financial independence. Overly conservative portfolios can be outcome-risky because they prioritise short-term stability over long-term adequacy. If your portfolio is built to avoid discomfort rather than to match a real spending obligation, you may protect yourself from temporary drawdowns but expose yourself to a permanent shortfall. This is particularly dangerous because it happens quietly, and it usually becomes obvious only years later, when time and compounding can no longer be reclaimed.

Inflation is a compounding force

A useful way to think about inflation is to treat it as a silent annual ‘fee’ on your wealth. In the same way that investment fees compound against you, inflation compounds against you, and the compounding effect is what turns a modest annual rate into a material long-term threat. The investor who parks money in cash because it feels ‘safe’ often underestimates how devastating a small real return can be over a decade or two. It’s important to bear in mind that, even if you are earning a positive nominal return, what matters is the return after inflation and after real-world costs reduce what you keep, such as taxes and fees. Remember, while cash and money market returns can be attractive in certain rate environments, they are not designed to grow purchasing power meaningfully over long periods. The result is that what you believe to be ‘safe’ is in fact riskier than accepting market volatility for what it is.

Why investors move into cash at exactly the wrong time

In our experience, the move into conservative assets is rarely part of a disciplined financial plan, but rather a reaction to uncertainty. Ironically, investors tend to seek safety after volatility has already arrived – the result being that they often crystallise the emotional impact of the downturn and then lock themselves into lower long-term return potential just as markets are repricing future returns more attractively. And, while this behaviour is understandable, it is not without consequence. This is because when you shift a long-term portfolio into cash because you want fewer unpleasant surprises, you may reduce short-term volatility, but you also reduce the probability of achieving real growth. This is because the long-term cost does not present itself as a single mistake, but rather as years of lost opportunity.

Aligning risk to spending horizons: a more practical framework

We believe that a more useful approach is to ask, ‘When will I need this money, and what do I need it to do for me at each point in time?’ This is because spending horizons create structure, and structure reduces the temptation to make emotional decisions when markets feel uncomfortable. For most households, it is helpful to think in layers, because not all money has the same job:

• Money you’ll need soon (roughly the next 1–2 years): Keep this portion easy to access and relatively steady. It’s for day-to-day cash flow, planned expenses, and your emergency buffer. The aim here isn’t high growth – it’s making sure you won’t be forced to sell investments at the wrong time because you suddenly need cash.
• Money you’ll need a little later (about 2–7 years): This money has a bit more time to recover if markets wobble, so it doesn’t need to sit entirely in ‘parking mode’. It still needs to be handled carefully, but it can usually take some ups and downs while working a bit harder than short-term cash.
• Money you won’t need for a long time (7+ years): This is where you need your money to keep up with – and ideally stay ahead of – inflation. The value will move around from year to year, but over long periods, this layer’s job is to protect your buying power, so that future costs don’t slowly outrun your plan.

The key takeaway here is that risk should not be considered in isolation, but rather matched to your time horizons, because time changes what risk actually means.

Retirees face a particularly sharp version of this problem

Retirement is where the ‘play it safe’ impulse can become most damaging, because retirees often shift aggressively into conservative assets at exactly the point when their portfolio needs to work the hardest. Remember, a retirement portfolio is not a bank account, but an income engine that may need to sustain spending for decades. Even if you intend to keep your lifestyle modest, your costs will change, and healthcare inflation in particular has a way of ambushing even well-prepared plans.

The solution is not to take reckless risk, but to build a portfolio that can fund near-term income with stability while still maintaining meaningful long-term growth exposure. When the retirement portfolio is structured around spending horizons, you are far less likely to sell growth assets in a downturn to fund monthly income, because your income is being funded from the correct layer of the portfolio.

A better definition of ‘safe’

In a financial plan, ‘safe’ should not mean that your balance never dips.  Rather, it should mean that your plan is resilient, your objectives remain achievable, and your purchasing power is protected over time. A portfolio can only be called safe if it is safe relative to what it must fund – and what most goals require is not perfect stability, but dependable real growth across decades. The irony is that investors often think they reduce risk by avoiding market volatility, when in reality they are merely swapping one risk for another, and choosing the one that is quieter, slower, and more difficult to correct.

Remember, the goal is not to be aggressive, but to be appropriately exposed, ensuring that your portfolio is designed around your time horizons, spending needs, and real-world inflation. In closing, keep in mind that ‘playing it safe’ is not an investment strategy, but ultimately a decision that needs to be tested against whether your future lifestyle remains affordable.

Have a wonderful day.

Sue