Term deposits offer certainty. You know the rate, you know the term, and you know what your balance should look like at maturity. That certainty has value. But certainty and suitability are not always the same thing.
Introduction
New Zealanders have always had an affinity for term deposits. They feel familiar, they feel safe, and they are easy to understand. I was recently asked what a couple should do with a term deposit that was about to roll over. Rather than jumping straight into my own view, I asked what they liked about them.
They spoke about safety, guaranteed returns, and the ability to set and forget. All fair points. Those are the strengths of a term deposit. The more important question, though, is whether those strengths actually align with the purpose of the money.
Why banks love term deposits
Term deposits provide banks with stable, predictable funding. They can lock in capital for a period, lend against it, and manage their funding needs with far more confidence than they can with money sitting in everyday accounts. That is part of the reason banks are so comfortable promoting them.
For investors, the appeal is different. A term deposit gives a known return, some discipline around access, and comfort that the money is not being exposed to market volatility. For short-term cashflow needs, that can be entirely appropriate.
The issue is that many people end up using a term deposit as a default destination for capital, not because it is the best strategic option, but because it is the most familiar one.
The catch
The nominal return on a term deposit is obvious. It is clearly stated, easy to compare, and often feels reassuring. What is less obvious is what happens after inflation and tax are taken into account.
Inflation quietly erodes purchasing power. That means the number on the maturity statement is not the whole story. Financial projections should always focus on real outcomes, not just nominal ones, because what matters is what your money can still do for you in the future.
Using the figures referenced in the article draft, a 1-year term deposit rate of 3.8% against inflation of 2.7% leaves a real return of only 1.1% before tax. During periods of high inflation, the maths can turn negative quickly. In 2022, when inflation peaked materially higher, many cash-style returns were not preserving real purchasing power at all.
That does not make term deposits bad. It simply means they should be matched to the right intention. If the funds are there for a home purchase, a land opportunity, or another short-dated need, preserving nominal capital may matter more than pursuing long-term growth. If the money is intended to build wealth over time, the conversation usually needs to be broader.
Advice matters here because the best home for capital depends on timeframe, flexibility requirements, risk tolerance, and what role the money needs to play in the wider plan.
Consensus
Term deposits absolutely have their place. They can be useful for capital that needs to remain steady, visible, and available on a known timeline. They can provide confidence around short-term decisions and reduce the temptation to overcomplicate money that already has a defined purpose.
Where they often fall short is in long-term wealth building. Real wealth generally requires a strategy that can compete with inflation, tax, and the evolving opportunities life presents. That is where broader portfolio construction, intentional asset allocation, and ongoing advice come in.
The goal is not to dismiss term deposits. It is to use them deliberately. The right tool should serve the purpose of the money, not become the strategy by default.
References and notes
- Heartland Bank term deposit interest rates.
- Reserve Bank of New Zealand inflation information.
- interest.co.nz term deposit rate data.
- Dimensional summary chart on inflation-adjusted short-term interest returns. Separate permission may be required before reproducing a chart publicly.