How to build a $100,000 ASX share portfolio from scratch

You may be surprised how quickly you could reach this goal.

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Reaching a six-figure investment portfolio might sound daunting, especially if you're starting from scratch. But with the right strategy and patience, it certain can be achievable.

Here's how you could work toward building a $100,000 portfolio from zero, without needing to win the lottery or gamble on speculative ASX shares.

Start with a strong foundation

The first step is choosing investments that can steadily grow over time. Exchange-traded funds (ETFs) can be a great way to begin, offering instant diversification and low costs.

For example, splitting your early contributions between a broad local fund like the Vanguard Australian Shares Index ETF (ASX: VAS) and a global growth fund such as the Betashares Nasdaq 100 ETF (ASX: NDQ) can give you exposure to thousands of companies.

This includes local ASX blue chip shares like BHP Group Ltd (ASX: BHP) and Commonwealth Bank of Australia (ASX: CBA) to global leaders like Microsoft (NASDAQ: MSFT) and s (NASDAQ: AAPL).

This approach keeps your portfolio diversified while capturing the growth of both the Australian and global economies.

Invest consistently

Consistency really is key when building wealth. Even modest, regular contributions can snowball over time thanks to the power of compounding. For example, investing $1,000 per month into a diversified portfolio earning a 10% annual return (not guaranteed) could grow to over $100,000 in just over six years.

The exact time frame will depend on returns and contributions, but the principle remains the same: steady, repeated investing beats sporadic lump sums and market timing attempts.

Reinvest dividends to accelerate growth

Dividends are powerful wealth builders when reinvested. Many ASX shares offer dividend reinvestment plans (DRPs), allowing you to automatically buy more units instead of taking cash payouts.

This helps your portfolio compound faster, as you earn returns not only on your contributions but also on the growing dividend base.

Gradually add individual shares

Once you've built a solid base with ASX ETFs, you might want to start adding select individual ASX shares with strong long-term prospects.

Companies like WiseTech Global Ltd (ASX: WTC), Pro Medicus Ltd (ASX: PME), or CSL Ltd (ASX: CSL) have track records of compounding earnings and could provide additional growth.

The key is to keep your portfolio balanced. Individual shares should complement your ETFs, not replace them entirely.

Be patient

Market downturns are inevitable, but reacting emotionally can derail your plans.

The key is to stay invested and continue your contributions — even during volatile periods. It can make the difference between a $50,000 and a $100,000 portfolio over time. It also allows investors to benefit from dollar cost averaging.

Foolish takeaway

Building a $100,000 portfolio from scratch isn't about finding shortcuts or taking wild risks. By starting with diversified ASX ETFs, investing consistently, reinvesting dividends, and gradually layering in quality shares, you can put yourself on track to hit that milestone.

Motley Fool contributor James Mickleboro has positions in BetaShares Nasdaq 100 ETF, CSL, Pro Medicus, and WiseTech Global. The Motley Fool Australia's parent company Motley Fool Holdings Inc. has positions in and has recommended Apple, BetaShares Nasdaq 100 ETF, CSL, Microsoft, and WiseTech Global. The Motley Fool Australia's parent company Motley Fool Holdings Inc. has recommended Pro Medicus 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 BetaShares Nasdaq 100 ETF and WiseTech Global. The Motley Fool Australia has recommended Apple, BHP Group, CSL, Microsoft, and Pro Medicus. 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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