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How Compounding Actually Works (And Why It's on Your Side)
Compounding is one of those ideas everyone's heard of and almost no one feels in their gut. Here's the plain version: when your investment earns a return, that return gets added to your balance. Next year, you earn a return on the original amount and on last year's return. The year after that, you're earning on all three. Nothing you do changes. The maths just starts working harder for you.
A worked example
Say you invest $10,000 at a 7% annual return and never add another dollar.
In year one, that 7% return is $700. Nothing remarkable yet, it's just 7% of $10,000.
By year 20, without adding anything extra, that same 7% is generating about $2,530 in a single year. That's because you're no longer earning 7% on $10,000. You're earning it on $36,165, since two decades of returns have piled on top of the original amount. Your total balance by then is close to $38,700, nearly four times what you started with, and you never contributed another cent.
That's the part that doesn't feel intuitive. The growth is slow and boring for years, then it stops being boring.
Why time matters more than timing
This is also why starting earlier tends to beat starting bigger. Someone who invests smaller amounts for an extra ten years usually ends up ahead of someone who invests more but starts a decade later, because the earlier money has had more time for its own returns to start earning returns. You can't get that time back once it's gone, no matter how much you catch up on contributions.
KiwiSaver is the compounding machine most New Zealanders already have
If you're contributing to KiwiSaver, you're already doing this. Regular contributions from your pay, an employer match on top, and investment returns compounding over years or decades, all working together. The early years of a KiwiSaver balance often look unremarkable. The later years are where it becomes obvious what's been happening the whole time.
Why this matters for tracking, not just investing
Compounding is invisible day to day. Nobody feels their portfolio compound between Tuesday and Wednesday. It only becomes visible in hindsight, when you can see where you started and where you are now. That's exactly what OWNS is for: not to watch your money hour by hour, but to give you the long view that makes years of quiet, unglamorous growth actually visible.
See your own compounding, over time
Owly OWNS tracks your portfolio value over time, so the growth that's easy to miss day to day becomes obvious in hindsight. Free, no brokerage connection required.