The Straits Times Index (SGX: ^STI) hit a new high of 5,232 on 24 June 2026, sparking fears that a market correction could be just around the corner.
Due to loss aversion, even a temporary pullback can feel painful, causing investors to second-guess themselves despite having a long-term investment horizon.
However, the fear of buying at a market peak often causes investors to wait indefinitely for a correction that may never arrive.
It helps to remember that while periodic market setbacks gain more attention, long-term economic growth and corporate innovations historically push markets higher over time.
If you have a S$100,000 windfall from a bonus, inheritance or years of accumulated savings, how should you deploy it today?
Is it wiser to invest a single lump sum, or take a gradual dollar-cost averaging (DCA) approach?
What Is Lump Sum Investing?
Lump sum investing involves deploying a large amount of capital into the market at once rather than spreading it out over time.
The goal here is to maximise the time your money spends working in the market rather than sitting idly in cash.
The biggest drawback with this approach is that you could be investing all your money right before a market downturn.
This could result in significant losses, which can severely shake an investor’s confidence.
Even though these downturns are typically temporary and the long-term strategy remains fundamentally sound, psychological loss aversion can make a sudden dip emotionally challenging to stomach.
What Is Dollar-Cost Averaging (DCA)?
DCA involves investing money in fixed, regular instalments over a set period rather than all at once.
For example, instead of investing S$100,000 immediately, an investor might divide the amount into equal monthly tranches.
By investing systematically, DCA spreads purchases across fluctuating market conditions.
Investors buy more units when prices are lower and fewer when prices are higher, reducing the impact of short-term market fluctuations.
This discipline allows investors to automatically accumulate more shares when prices are low and fewer when prices are high, smoothing out the average cost of the investment.
However, while DCA can help manage short-term timing risk, it requires a portion of the capital to remain in low-yielding cash while waiting to be deployed.
Consequently, DCA tends to underperform a lump sum strategy during sustained bull markets because less capital is exposed to market growth in the early stages.
When Lump Sum Investing May Make Sense
For younger investors, there are many years before their investments will need to be realised and cashed out.
With time on their side, they can better endure short-term market volatility and fully harness the compounding power of market growth on their total capital.
Lump sum investing also works for experienced investors with strong conviction in the market’s long-term trajectory.
Those with a multi-year perspective are less concerned about temporary market movements and remain focused on future growth potential.
Ultimately, investors who are holding substantial amounts of cash can reduce the risk of cash sitting idle and missing out on potential market returns.
When DCA May Make Sense
For first-time investors, DCA makes entering the market less intimidating.
Investing gradually allows them to become more comfortable with price fluctuations while reducing the pressure of committing a large sum all at once.
During periods of elevated market volatility, DCA helps investors spread purchases over time to smooth out the impact of short-term swings.
A strategy is only effective if an investor can stick with it, and DCA can provide valuable peace of mind.
Knowing that capital is being deployed gradually helps reduce anxiety, making it much easier to stay disciplined over the long haul.
Lump Sum vs DCA Scenarios
Scenario A: Market rises after the STI peak
In this case, lump sum investing will generally outperform DCA because the entire investment is exposed to market gains from the outset.
Every dollar gains from the upward movement, allowing returns to compound sooner.
Scenario B: Market falls after the STI peak
In this scenario, DCA may produce a better outcome because later investments are made at lower prices, potentially lowering the average cost over time.
A lump sum investor, however, experiences the full downturn impact as all their capital is already invested.
Beyond financial outcomes, DCA also provides psychological comfort, as investors feel reassured knowing that not all of their capital was invested yet.
Scenario C: The market moves sideways
When markets move sideways for an extended period, neither strategy gains a significant advantage from timing.
Lump sum investors may experience modest fluctuations in portfolio value, while DCA investors gradually build their positions across similar price levels.
Over time, the difference in returns is often relatively small, and staying invested is key.
Is There a Middle Ground?
The answer is yes.
Instead of investing a lump sum, investors can take a hybrid approach, splitting the amount equally into:
- S$50,000: Lump sum investment for maximum time in the market
- S$50,000: DCA over the next 10 months to soothe potential market volatility
By using this approach, investors mitigate the risk of a market crash while avoiding the opportunity cost of holding cash.
The Bigger Lesson: Market Peaks Are Normal
Market highs often feel intimidating, but history shows that long-term economic growth tends to push markets higher over time.
For example, if you had bought the SPDR Straits Times Index ETF (SGX: ES3) 10 years ago when it was trading at S$10,004, your investment would have more than doubled as it trades at S$26,710 now.
Successful investors focus on long-term trends rather than short-term fluctuations, as they will matter far less when your investment horizon spans decades.
Trying to perfectly predict the “best” moment to buy or sell is extremely difficult.
Staying invested over long periods allows your money to grow through compounding, especially when dividends are reinvested.
Get Smart: The Best Strategy Is the One You Can Stick With
When it comes to investing, there is no silver bullet approach.
Both lump sum and DCA have advantages, and which will be better suited for you depends on your investment philosophy.
Remember, the path to capital appreciation is not about doing something at the right time.
It is about staying invested with a disciplined strategy and giving it enough time to work.
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Disclosure: Wenting A. does not own any of the stocks mentioned.
