How much will I have if I invest $1,000 a month in ASX shares for 30 years?

Let's do the calculations and find out.

Hand of a woman carrying a bag of money, representing the concept of saving money or earning dividends.

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Building wealth isn't about hitting the jackpot on a single stock. It is about consistency — setting money aside every month and letting compounding work over decades.

So what happens if you commit to investing $1,000 a month in ASX shares for 30 years?

The power of consistency

Investing $1,000 every month adds up to $12,000 a year, or $360,000 over three decades. On its own, that's already a meaningful sum. But once you add in returns and reinvested earnings, the picture changes dramatically.

At an average annual return of 10% per annum (roughly in line with long-term share market averages, though never guaranteed), that $360,000 of contributions would grow to around $2 million after 30 years.

That's the magic of compounding: your investments generate returns, those returns are reinvested, and the snowball gets bigger every year.

Why quality matters

Of course, not every investment will deliver 10% per annum over the long term. That's why focusing on quality is crucial.

On the ASX, shares like CSL Ltd (ASX: CSL), ResMed Inc. (ASX: RMD), and WiseTech Global Ltd (ASX: WTC) have demonstrated the kind of growth that can sustain compounding over decades. These businesses operate in large, growing markets and benefit from competitive advantages that help them generate consistent returns.

For those who prefer instant diversification, high-quality exchange-traded funds (ETFs) like the iShares S&P 500 ETF (ASX: IVV) or the Betashares Global Quality Leaders ETF (ASX: QLTY) provide access to world-class businesses such as Apple (NASDAQ: AAPL), Microsoft (NASDAQ: MSFT), and Nestle (SWX: NESN).

By sticking with quality, you increase your chances of achieving returns closer to that 10% long-term average.

Think long term

The biggest challenge isn't the maths — it is the patience. Markets will always go through ups and downs, and it can be tempting to pull out when things get rocky. But history shows that staying invested through the cycle is one of the most reliable ways to build wealth.

Reinvesting dividends and resisting the urge to time the market can make the difference between a comfortable portfolio and missing out on decades of compounding.

Foolish takeaway

If you invest $1,000 a month for 30 years and achieve a 10% annual return, you could finish with more than $2 million. That's the power of consistency, compounding, and quality.

The lesson is simple: start as soon as you can, stick to high-quality investments, and give your money the time it needs to grow. The results could transform your financial future.

Motley Fool contributor James Mickleboro has positions in CSL, ResMed, and WiseTech Global. The Motley Fool Australia's parent company Motley Fool Holdings Inc. has positions in and has recommended Apple, CSL, Microsoft, ResMed, WiseTech Global, and iShares S&P 500 ETF. The Motley Fool Australia's parent company Motley Fool Holdings Inc. has recommended Nestlé and has recommended the following options: long January 2026 $395 calls on Microsoft and short January 2026 $405 calls on Microsoft. The Motley Fool Australia has positions in and has recommended ResMed and WiseTech Global. The Motley Fool Australia has recommended Apple, CSL, Microsoft, 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.

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