What $100 invested in Australian shares each week starting this Christmas could become

Christmas and New Year are often a time for reflection and small promises we quietly make about the year ahead.

For many Australians, one of those promises is to finally start investing.

The good news is that you don’t need a large lump sum of money to get the ball rolling. That’s because consistency can turn small sums into serious wealth with a combination of consistency and discipline.

Let’s imagine an investor starts this Christmas by putting $100 a week into quality Australian shares and keeps going for the next decade.

There is no trading, no trying to outsmart the market, and no dramatic moves. Just steady investing in well-established Australian businesses, with any dividends reinvested along the way to maximise compounding.

Small investments in Australian shares

Investing $100 a week might not feel life-changing at first. It is roughly the cost of a few takeaway coffees, a streaming subscription, and a modest night out. But over time, those weekly contributions add up.

Over one year, that’s $5,200 invested. Over ten years, it becomes $52,000 in total contributions.

What matters next is what time and compounding do with that money.

What happens over 10 years?

If we assume a 10% total annual return, which is broadly in line with long-term share market averages when including dividends, the outcome may surprise you.

With regular weekly investments of $100 and a 10% return, the portfolio would grow to approximately $87,000 after 10 years.

That means around $35,000 of the final balance comes from growth, not from extra savings. In other words, the market is doing a significant portion of the heavy lifting.

And importantly, this result doesn’t require perfect timing or picking speculative stocks. It simply assumes exposure to quality Australian shares like ResMed Inc. (ASX: RMD) and Goodman Group (ASX: GMG) over a full market cycle, with patience and discipline.

Why consistency wins

The beauty of investing weekly is that it removes emotion from the process. You automatically buy more Australian shares when prices are lower and fewer when prices are higher. This is called dollar cost averaging and smooths out volatility and reduces the pressure to get it right.

Reinvesting dividends rather than spending them also helps accelerate growth, even if it doesn’t feel exciting in the moment. Those reinvested distributions quietly buy more shares, which then generate more growth of their own.

Starting this Christmas

Starting this Christmas isn’t about chasing quick wins. It is about putting a simple habit in place and letting time do the rest.

Ten years from now, that $100 a week could become a portfolio worth around $87,000, built steadily in the background while life carried on as normal.

And perhaps more importantly, it creates momentum. Once the habit is established, increasing contributions or extending the time horizon can lead to far bigger outcomes.

For example, carry on with the strategy for a further 10 years and your portfolio would be worth $315,000, all else equal.

Sometimes, the most powerful financial decisions are the quiet ones made without much fanfare. Starting small this Christmas could be one of them.

The post What $100 invested in Australian shares each week starting this Christmas could become appeared first on The Motley Fool Australia.

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Motley Fool contributor James Mickleboro has positions in Goodman Group and ResMed. The Motley Fool Australia’s parent company Motley Fool Holdings Inc. has positions in and has recommended Goodman Group and ResMed. The Motley Fool Australia has positions in and has recommended ResMed. The Motley Fool Australia has recommended Goodman Group. The Motley Fool has a disclosure policy. This article contains general investment advice only (under AFSL 400691). Authorised by Scott Phillips.