What $100 a week in ASX shares could become in 20 years

Would it be worth investing weekly into ASX shares? Let's find out.

| More on:

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More

Key points
  • Investing $100 weekly harnesses the power of dollar-cost averaging, allowing investors to build wealth steadily without needing to time the market perfectly.
  • Focusing on established companies with strong growth potential, like ARB Corporation or Breville Group, can provide sustainable returns, transforming small investments into significant gains over time.
  • With a consistent 10% annual return, investing $100 weekly could result in a portfolio worth approximately $315,000 after 20 years, illustrating the substantial impact of regular, disciplined investing.

If you've ever felt that investing is something only high earners or seasoned market veterans can do, you would be wrong.

You don't need a lump sum to build serious long-term wealth. You just need consistency. In fact, one of the simplest and most powerful strategies available to everyday Australians is investing a small amount every week.

So, what could $100 a week, barely the cost of a couple of dinners out, turn into over 20 years on the Australian share market? Let's find out.

Happy young couple saving money in piggy bank.

Image source: Getty Images

Investing small amounts

When you invest regularly, you take advantage of something called dollar-cost averaging. Instead of trying to pick the perfect buying moment (which even the pros struggle with), you gradually build your holdings over time, buying more when prices fall and less when prices rise.

Combine this with the fact that the share market has historically returned around 10% per annum on average, and suddenly even modest weekly contributions can snowball into something life-changing.

Where to invest

You want to think about businesses that have strong growth drivers and sustainable competitive advantages.

Take ARB Corporation Ltd (ASX: ARB), which is a global leader in 4WD accessories that has steadily expanded internationally. Or Breville Group Ltd (ASX: BRG), which is an appliance manufacturer that has been growing for decades. Investment bank Macquarie Group Ltd (ASX: MQG) could also be worth a look given its long track record of strong shareholder returns.

These aren't speculative micro-caps, they are established, profitable companies with clear runways for growth. And drip-feeding small weekly investments into quality businesses like these can quietly transform your financial future over time.

What $100 a week could become

Now for the big question. If you invested $100 every week and earned 10% per year on average, what would $100 a week turn into?

After 20 years, your weekly contributions into your portfolio could grow to around $315,000.

And remember, this doesn't require picking the perfect stocks, timing the market, or taking huge risks. It simply requires staying consistent, focusing on quality, and giving your investments time to work.

You could even opt for a broad-based index fund like the Vanguard Australian Shares Index ETF (ASX: VAS) for Australia or the iShares S&P 500 ETF (ASX: IVV) for the United States.

Foolish takeaway

$100 a week may not feel like much today. But when you combine patience, discipline and the long-term strength of the ASX, it becomes a powerful wealth-building engine.

The best part? You can start anytime. And the sooner you begin, the more time compounding has to quietly turn small weekly savings into something extraordinary.

Motley Fool contributor James Mickleboro has no position in any of the stocks mentioned. The Motley Fool Australia's parent company Motley Fool Holdings Inc. has positions in and has recommended ARB Corporation, Macquarie Group, and iShares S&P 500 ETF. The Motley Fool Australia has positions in and has recommended Macquarie Group. The Motley Fool Australia has recommended ARB Corporation and iShares S&P 500 ETF. The Motley Fool has a disclosure policy. This article contains general investment advice only (under AFSL 400691). Authorised by Scott Phillips.

More on How to invest

A beautiful woman holds up one finger with one hand and has her hand on her waist with the other as she smiles widely as though she is very pleased about something.
How to invest

The Warren Buffett rule I keep coming back to with ASX shares

Instead of chasing cheap shares, this Buffett principle shifts the focus to something far more important.

Read more »

Woman with long hair smiles for the camera.
How to invest

Where I'd invest my first $500 into ASX shares

By focusing on simple, high-quality investments, it’s possible to build a strong foundation for long-term wealth from day one.

Read more »

A mature aged man looks unsure, indicating uncertainty around a share price
How to invest

How to invest in ASX shares when the market feels uncertain

Don't let volatility stop you from investing. Here's how to handle it.

Read more »

Workers planning together in a design team.
How to invest

How to build a $25,000 ASX share portfolio from zero

Time, compounding, capital, and good investments is all you need.

Read more »

A young female investor with brown curly hair and wearing a yellow top and glasses sits at her desk using her calculator to work out how much her ASX dividend shares will pay this year
How to invest

How to start investing in ASX shares with $1,000

The first investment is often the hardest. Here’s how I would approach it with $1,000.

Read more »

A banker uses his hands to protect a pile of coins on his desk, indicating a possible inflation hedge.
How to invest

Stagflation: How to position an ASX stock portfolio

Investing with stagflation might become a necessity on the ASX...

Read more »

A man thinks very carefully about his money and investments.
How to invest

How to build a second income from ASX shares without taking big risks

You don't have to risk it all to build a second income on the share market.

Read more »

A couple are happy sitting on their yacht.
How to invest

A 2026 market crash could be a once-in-a-decade chance to build a $1 million ASX portfolio

The investors who built lasting wealth didn't avoid market crashes. They used them.

Read more »