Don’t Just Save Money – Make It Work for You

Yes, you read it correctly: don't save money.

You have probably heard the saying cash is king. For decades, the sensible thing to do with spare money was to put it in the bank and leave it there. Safe, predictable, and boring in all the right ways.

The problem is the maths has changed. In New Zealand today, after tax and inflation, money sitting in a savings account or term deposit is almost certainly losing purchasing power. Every year it stays there, your wealth quietly shrinks.

If there is one idea to take from this article, let it be this: money losing ground to inflation is money losing value. Saving has a role, and an important one, but investing is how you build and sustain financial freedom.

This article is about long-term surplus cash: money beyond your emergency fund and near-term spending commitments. If you have more than $50,000 sitting in a savings account or rolling term deposits with no clear plan for when or how it will be used, what follows is written for you.

Why Saving Feels Right but Goes Wrong

Saving money is an act of self-discipline. Every dollar set aside is a small vote for your future self. The impulse is sound.

What matters is what happens to those dollars once they land in a bank account and stay there for years.

A savings account paying 4% sounds reasonable until you subtract Resident Withholding Tax at your marginal rate and then compare the result to inflation. For someone earning over $78,100 and paying tax at 33%, a 4% term deposit returns 2.68% after tax. If inflation is running at 3.1% (as it was for the year to December 2025), the real return is negative: your bank balance goes up while your purchasing power goes down.

At higher tax brackets the picture is worse, and even at the lower brackets the margin is razor-thin. The arithmetic on negative real returns is worth working through if you hold meaningful cash balances.

The Scarcity Problem

We tend to think of money as something precious and finite. In reality, governments create it freely, and they do not even need a printing press. A few keystrokes at a central bank and billions of dollars of new money supply appear. This process, formally known as quantitative easing, was deployed on an enormous scale after the Global Financial Crisis and again during COVID-19. While monetary policy is more nuanced than simply "printing money," the long-term effect is a larger supply of currency relative to the pool of real assets it can buy.

The Reserve Bank of New Zealand Governor Adrian Orr once made headlines when he joked about the business of central banking: you print money and people believe it. The line landed because it was at least partly true.

Even now, with the OCR at 2.25% and the Reserve Bank fighting to keep inflation within its 1–3% target band, the fundamental dynamic remains. Term deposit rates have followed the OCR down, yet the cost of living has held firm. The result is the same: savers lose ground in real terms.

Property, businesses, and productive infrastructure are genuinely scarce. They produce income, and over multi-decade periods they have consistently grown in value faster than the currency in which they are priced. This is the core argument for investing over saving: you exchange something easily created (currency) for something difficult to create (productive assets). Holding too much cash for too long means sitting on the wrong side of this equation.

What Does "Investing" Actually Mean?

Investing means putting your capital into assets with the expectation of generating returns above inflation over time. In practice, the main options available to New Zealanders fall into a few broad categories:

• Shares (equities): Ownership in businesses, either directly or through managed funds and exchange-traded funds. Over multi-decade periods in New Zealand and comparable markets, diversified equity portfolios have consistently outpaced inflation after tax. They are also the most volatile of the major asset classes, and there will be years where markets fall significantly. Time has historically rewarded patience, but the short-term ride is not always comfortable.
• Property: Residential or commercial property investment offers rental income and long-term capital growth. Property also acts as a natural inflation hedge: as construction and labour costs rise, so does the replacement value of existing buildings. Like shares, property values fluctuate, and capital is not as easily accessed as a bank deposit.
• Bonds: Loans to governments or companies paying a fixed return. Bonds carry less volatility than shares and provide stability within a broader portfolio. For capital you want to keep relatively safe but earn more than a bank deposit, bonds often compare favourably to term deposits.
• KiwiSaver: For most New Zealanders, their KiwiSaver Scheme is the first and easiest way to invest in a diversified mix of these asset classes. Employer contributions and government incentives provide an immediate boost no bank account can match. The catch is many members are technically invested but not necessarily invested well: contribution rates may be too low, fund choices may not reflect their time horizon, and inertia means years can pass without a review.

You do not need to pick one. A well-diversified portfolio typically combines several or all of these, weighted to your goals, time horizon, and tolerance for short-term volatility. The trade-off is real: growth assets fluctuate in value, and capital preservation over short periods cannot be guaranteed. The objective is to ensure the weighted, after-tax return of everything you own comfortably exceeds the rate of inflation over the timeframes relevant to your goals.

If you are unsure how much of your current savings count as "surplus" versus genuinely needed for short-term purposes, an adviser can help you quantify the number. Become Wealth offers a complimentary initial consultation to work through your position.

When Saving Still Makes Sense

Cash belongs in specific, short-term roles. An emergency fund covering three to six months of living expenses should sit in a readily accessible savings account. This provides a financial cushion for job loss, illness, or unexpected expenses. Three to four months is typically the stand-down period before income protection insurance begins paying, which is one reason the three-to-six-month range is widely recommended.

Money earmarked for spending within the next 12 to 24 months, a house deposit, a renovation, a planned purchase, should also remain in cash or near-cash. Exposing short-term funds to market volatility creates unnecessary risk.

The Depositor Compensation Scheme now protects up to $100,000 per depositor at each licensed New Zealand bank. For cash serving these short-term purposes, the safety is real and welcome.

Once emergency reserves and near-term spending are accounted for, remaining surplus cash is generally better treated as investment capital.

The Cost of Waiting

We regularly see clients who have held large cash balances for years, often because the amount felt too significant to do anything hasty with. The intention is always responsible: they want to think it through, do their research, find the right time.

The irony is the delay itself is typically the most expensive decision they make. Every year a six-figure sum sits in a term deposit losing real value, the gap between where the money is and where it could be grows wider. Over a decade, the compounding effect of even modest positive real returns from a diversified portfolio can be substantial compared to the near-zero or negative real returns earned in cash.

Recognising the status quo matters here. Holding surplus cash is a decision, and it comes with a measurable, ongoing cost. A plan and a timeline turn a vague intention into progress.

"The single most common pattern we see across new clients is large cash balances held too long. Not because they didn't know investing was an option, but because making the first move felt like a bigger risk than doing nothing. By the time they sit down with us, many are surprised to learn how much purchasing power they've already lost. The maths is usually the thing that shifts the conversation from 'maybe one day' to 'let's start.'"
— Jonny McNamee, Financial Adviser, Become Wealth

Don't Save Money in New Zealand

Cash may be king for short periods, but over any meaningful timeframe, invested assets have consistently outperformed savings in real terms. The evidence from decades of New Zealand and global market data supports a straightforward conclusion: after tax and inflation, bank savings go backwards while diversified portfolios go forwards.

Financial freedom comes from owning productive assets and allowing compounding to do the heavy lifting over time. Save enough for safety and short-term needs. Put the rest to work.

If you are not sure where the line falls between "enough for safety" and "surplus sitting idle," here is a starting point: check the total you hold in savings accounts and term deposits, subtract your emergency fund and any money committed to a specific purpose within the next two years, and look at what remains. If the number is meaningful, it may be time to consider whether it belongs somewhere with better long-term prospects.

Become Wealth helps New Zealanders build and sustain wealth across every stage of life. If you would like to talk through how your current savings and investments are positioned, book an initial consultation. It's complimentary, confidential, and there is no obligation.