Why your contribution rate matters more than you think and what to do about it today.
We tend to think of retirement as something that happens later. A future version of our lives that we’ll deal with when it feels more urgent. But here’s the uncomfortable truth: the decisions you’re making right now quietly, monthly, often without much thought, are already shaping that future in ways that are very hard to reverse.
And one of the most powerful levers in that equation is one that most people barely glance at: their pension contribution rate.
The Compounding Secret Most People Miss
There’s a reason financial advisors talk about starting early until it becomes something of a cliché. It’s because the numbers genuinely bear it out in ways that feel almost unfair.
Consider two people. Both contribute 15% of their salary to their pension. The only difference? One starts at 25, the other at 35. A single decade’s head start results in nearly double the retirement pot for the earlier saver, even if the later starter tries to catch up by contributing more.
This is compounding at work. And the cruel irony is that the years when we’re least likely to think about retirement, our mid-twenties, when life feels long, and retirement feels abstract, are precisely the years when our contributions carry the most weight.
Small Adjustments, Surprising Outcomes
Here’s where it gets interesting. Research modelling shows that increasing your contribution rate from 7.5% to 27% over a 40-year career doesn’t just grow your savings proportionally; it increases them by nearly 3.5 times.
That’s the compounding effect in action. Each additional percentage point you contribute today generates not just more capital, but more returns on that capital, year after year, for decades.
Even incremental increases tell the same story. Each 1.5% bump in contribution rate can add between R1.4 million and R3.5 million to your final retirement savings, depending on investment returns. That’s not a rounding error — that’s a meaningful difference in the life you’ll be able to afford in retirement.
Don’t Overlook Pensionable Salary
There’s another variable that flies under the radar in most retirement conversations: your pensionable salary, the portion of your total salary on which your retirement contributions are actually calculated.
Many employees don’t realise they have any say in this, or don’t think it makes much difference. It does.
The modelling is clear: reducing your pensionable salary from 100% to 80% drops your contributions by 20%. That gap compounds over a career into a significantly smaller retirement pot. Conversely, maximising your pensionable salary — even when it means slightly less take-home pay today — can result in an approximate R5 million increase in total retirement savings over time.
That’s the kind of trade-off worth understanding before you make it passively.
Beyond the Numbers: The Principles That Make Plans Work
Getting the mechanics right is important. But even the best contribution rate means little without the habits and structure that hold a retirement plan together over decades.
A few principles that tend to separate resilient retirement portfolios from fragile ones:
Risk that matches your stage of life. A 30-year-old and a 60-year-old shouldn’t hold the same portfolio. Your investment strategy should evolve as you do — offering growth when time is on your side, and stability as retirement approaches.
Inflation isn’t optional reading. A retirement plan that doesn’t account for inflation isn’t a plan — it’s a slow erosion. The assets you hold need to grow faster than the cost of living, or your purchasing power quietly disappears.
Consistency through discomfort. Market downturns are when discipline matters most. Reducing or pausing contributions during volatile periods is understandable emotionally, but it breaks the compounding chain at exactly the wrong moment.
Regular reviews aren’t optional extras. Life changes. Your salary changes. Your goals change. A pension strategy that made sense at 35 might need meaningful adjustment at 45. Reviewing your plan periodically isn’t just good practice — it’s how you stay on track.
What the Savings Number Actually Needs to Do
It’s worth reframing what retirement savings are actually for. It’s not just about reaching a number. It’s about converting that number into an income stream that can sustain your lifestyle, potentially for 20 to 30 years.
The widely used benchmark is that retirees need between 70% and 80% of their pre-retirement income to maintain their standard of living. That means your accumulated savings need to generate that income, year after year, adjusted for inflation, without depleting the capital base too quickly.
To put that in practical terms: a retirement pot of R10 million, invested conservatively, might generate somewhere in the region of R600,000 to R700,000 per year. If your lifestyle costs more than that, you’ll start drawing down capital, and the clock starts ticking on how long that money will last.
Higher savings don’t just provide security. They provide options, the freedom to choose the right annuity structure, manage your drawdown flexibly, and face unexpected expenses without panic.
The Uncomfortable Simplicity of It All
There’s no great mystery at the heart of retirement planning. The principles are straightforward. Start early. Contribute as much as you sustainably can. Maximise the base on which those contributions are calculated. Stay invested. Review regularly. Get good advice.
The challenge isn’t complexity — it’s inertia. It’s the tendency to put off until later what would be far more powerful done today.
Whether you’re in your twenties, wondering if it’s worth starting yet (it is), your forties, trying to make up for lost time, or your fifties, finalising the structure of your plan, the best move is the same: have the conversation now, with someone who can show you exactly what your numbers mean and what’s still possible.
At mCubed, we work with clients at every stage of the retirement journey — not to hand them a generic plan, but to build something that reflects their life, their goals, and their timeline.
The small changes you make today are the big outcomes you’ll live with tomorrow. Let’s make them count.
Let’s run the numbers together.
