The three levers of retirement — and the one you control.

When people think about improving their retirement prospects — and most haven't yet found their actual retirement number — the instinct is usually to look for ways to earn more or invest better. More income, higher returns — these feel like the levers that matter. And they do matter. But they are also, to a significant degree, outside your direct control. The lever that is most firmly in your hands is the one that gets the least attention.

That lever is spending.

Lever one: income

Income is the foundation of retirement saving — the more you earn, the more you have available to set aside. And for most people, the desire to earn more is entirely reasonable. Career progression, skills development, negotiating a better salary, building a business — these are all worth pursuing.

But income has limits that are largely outside individual control. The job market shifts. Industries change faster than careers can adapt. Redundancy happens. Health intervenes. Caring responsibilities reshape working lives in ways that weren't planned for. The idea that income is something people can simply choose to increase — and sustain at whatever level retirement planning requires — overstates the degree of control most people actually have over their earning trajectory.

This is simply an honest acknowledgement that for most people, income is partly chosen and partly given — shaped by education and effort, but also by circumstance, timing, and forces that no individual controls.

Lever two: investment returns

Investing wisely is genuinely valuable. Choosing the right KiwiSaver fund for your timeline, diversifying savings across different assets, making informed decisions about where money is placed — all of these improve retirement outcomes in meaningful ways.

But investment returns are, in the end, subject to markets. And markets are subject to forces that no individual investor controls: economic cycles, geopolitical events, interest rate decisions, sector disruptions, and the simple unpredictability of how millions of participants behave simultaneously. A well-chosen investment strategy improves your odds significantly — but it cannot guarantee outcomes, and history is full of careful investors whose returns fell short of their projections through no fault of their own.

The investor's job is to make good decisions within an environment they cannot fully control. That is worth doing. It is not the same as having control over the outcome.

Lever three: spending

Spending is different from the other two levers in a fundamental way: it is a decision you make, repeatedly, every day. Not a circumstance you are born into, not a market you participate in — a choice. And unlike income or investment returns, the effects of that choice run in two directions simultaneously.

When you reduce spending that isn't genuinely adding to your life, you free up money to save — which grows your retirement fund. At the same time, you reduce the retirement income you'll need — which shrinks the target. Both ends of the equation move in your favour at once, from a single decision that is entirely yours to make.

This is what makes conscious spending the most powerful retirement lever available to most people. The environmental case for spending less shows how the same choices benefit the planet too. Not because it is easy — changing long-established habits rarely is — but because it is genuinely within your control in a way that income and investment returns are not.

The lifestyle question

There is a version of this argument that sounds like deprivation — spend less, have less, enjoy less. That is not what ThatDay is describing, and it is worth being direct about the difference.

The spending that conscious consumption targets is not the spending that genuinely adds to a good life. It is the spending that happens automatically, out of habit, social pressure, or the persistent cultural suggestion that more is better. It is the subscription that goes largely unused, the purchase that felt important in the moment and meaningless a week later, the upgrade that delivered less satisfaction than anticipated. Research on happiness and consumption is consistent on this point: beyond a certain level of material comfort, additional spending produces very little additional wellbeing.

What people find genuinely fulfilling — connection, purpose, time, health, experiences that are lived rather than bought — tends to cost considerably less than what consumer culture suggests is needed for a good life. The person who has examined their spending honestly and redirected it toward what actually matters to them does not typically feel poorer for it. They tend to feel freer.

This is the life that conscious consumption opens up. Not a smaller life — a more deliberate one. A life in which the things that matter are properly funded and the things that don't have stopped absorbing resources they were never returning in kind.

More control than you think

If retirement security depended primarily on income and investment returns, most people would be largely at the mercy of forces outside their control. But spending is yours. The decision to examine it honestly, and to redirect what isn't serving you toward your future, belongs entirely to you. It doesn't require a pay rise or a bull market. It requires clarity and intention — both of which are available to anyone who chooses them. And as explored in the retirement strategy nobody talks about, this clarity is available to everyone — not just high earners.

ThatDay exists to help people find that clarity. The lever is in your hands. ThatDay helps you see how far you can move it.

Take hold of the lever you control

ThatDay is a free retirement planning platform built for New Zealanders. It shows you clearly what different spending and saving choices do to your retirement picture — putting the most powerful lever firmly in your hands.

Its financial assumptions were independently validated by the University of Auckland Business School's Master of Applied Finance programme.

See what your spending choices mean for your retirement — start your free plan at thatday.co.nz

Further reading: Your retirement, your terms / Small amounts, surprisingly big results