Compounding Interest - 8th Wonder of the World

The 8th Wonder of the World

Albert Einstein once described compound interest as the “8th wonder of the world”and we agree! Compounding interest plays a powerful role in building your KiwiSaver balance. So, what is compounding interest?

Compounding happens when your investment earns returns, and then those returns also begin to earn returns. Think of it as a snowball rolling down a hill – starting small, but picking up more snow and momentum as it goes. The longer the hill, the bigger the snowball gets.

KiwiSaver is perfectly set up to take advantage of this. For example, if you contribute $200 a month from age 25, that’s $2,400* a year. After 30 years, if you received no interest, you would have saved $72,000, however with compound interest, even in a Conservative Fund (3%* return), your balance could grow to around $116,000*. Step into a Balanced Fund (5%* return) and it jumps to $167,000*. In a Growth Fund (7%* return), it could reach over $245,000*. That’s the power of time and compounding interest working together.

But what if you don’t start in your twenties?

It’s never too late to benefit. Someone starting at 45 and contributing the same $200 a month for 20 years could still build $66,000* in a Conservative Fund, $82,000* in a Balanced Fund, or $104,000* in a Growth Fund. While the totals are smaller, it’s still a meaningful boost to retirement savings – especially when combined with employer contributions and government top-ups (if you qualify).

The key takeaway

The earlier you begin, the more dramatic the compounding effect becomes. A 25-year-old investing regularly has decades of growth ahead, whereas someone starting later has fewer years for their returns to snowball. That’s why starting today – even with a small amount, all helps your fund.

Ultimately, compounding works no matter what stage you’re at. The right fund choice – whether Conservative, Balanced, or Growth will depend on your goals, risk appetite, and how long you have until retirement.

With us by your side, we can ensure you have the right strategy for your KiwiSaver fund, so compounding can do the heavy lifting, turning today’s contributions into your tomorrow’s retirement security.

*Disclaimer: Figures and returns are examples only, based on assumed returns, and are not guaranteed. Actual results will vary depending on your chosen fund, contributions, and market performance. For more information on KiwiSaver projections visit Financial Markets Authority

Compounding Interest – 8th Wonder of the World

The 8th Wonder of the World

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