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DCA vs lump sum investing in Australia

TrackMyShares Team

"Should I invest it all now or spread it out?" It is one of the most common questions Australian investors ask, especially after receiving an inheritance, selling a property, or accumulating savings. The answer depends on more than just the math.

Disclaimer: This article is for informational purposes only and does not constitute financial or tax advice. Past performance does not guarantee future results. Consult a qualified financial adviser before making investment decisions.

What the research says

Vanguard's well-known study on this topic found that lump sum investing outperforms dollar cost averaging approximately two-thirds of the time across markets in the US, UK, and Australia. The reason is simple: markets tend to go up over time, so getting your money invested earlier gives it more time to grow.

However, that still leaves roughly one-third of the time where DCA comes out ahead. These are the periods where the market dropped early in the investment window, allowing DCA to buy shares at lower prices.

The statistical edge of lump sum is real, but a two-thirds win rate means DCA is far from a bad strategy.

Australian data: DHHF, VGS, and VAS

Rather than relying on theory, you can test both strategies with actual ASX ETF prices using our DCA vs lump sum calculator.

Here are some examples you can explore:

Try adjusting the start date. Starting in early 2020 (just before COVID) versus late 2020 (during the recovery) gives very different results. This helps illustrate why the question does not have a universal answer.

When DCA makes sense

You received a large windfall. An inheritance, property sale, or redundancy payout can be overwhelming. Investing it gradually over 6 to 12 months lets you ease into the market without the stress of picking the perfect entry point.

Market volatility is making you anxious. If the idea of investing $100,000 all at once makes you lose sleep, DCA removes the pressure. Even if lump sum is statistically better, an approach you actually stick with beats one you abandon.

You are new to investing. If this is your first time buying ETFs, DCA lets you learn the process with smaller amounts before committing everything.

When lump sum makes sense

You are investing from regular income. If you are putting money into ETFs each payday, you are already dollar cost averaging. There is no separate decision to make.

The amount is small relative to your portfolio. If your existing portfolio is $500,000 and you are deciding what to do with an extra $20,000, the impact of timing is minimal. Just invest it.

You have a long time horizon. With 20 or 30 years until retirement, any short-term drawdown matters very little in the context of your total investment period. Time in the market dominates.

The compromise: invest half now, DCA the rest

If you are torn, a common approach is to invest half the amount immediately and DCA the remaining half over 3 to 6 months. This gives you partial exposure from day one while still reducing the risk of investing everything at a peak.

There is no mathematically optimal split. The point is to balance the statistical advantage of getting money into the market quickly with the psychological benefit of a gradual approach.

Brokerage costs for DCA in Australia

One practical consideration for Australian investors is brokerage. If you are making monthly purchases through a broker that charges $5 to $10 per trade, the brokerage costs of DCA can add up. Over 12 months of monthly purchases, that is 12 brokerage charges versus one for a lump sum.

Some brokers like Pearler offer automatic investing with competitive per-trade fees, which can make DCA more practical. Factor brokerage into your decision, especially for smaller investment amounts.

Try it yourself

Use our DCA vs lump sum calculator to model your own scenario with any ASX or US ETF. Enter your amount, pick a time period, and see how both strategies would have performed. It is free, no account needed.