Is Lump-Sum Investing Too Risky? Myth Busted: 3 Pieces of Evidence Show Why It Often Beats Dollar-Cost Averaging

It looks like there are only two options, but it’s actually a complex question. “Better” is relative — if you’re comparing dollar-cost averaging (DCA) versus lump-sum investing to see which is better, let me give you the answer upfront:

If You Have the Cash, Why Lump-Sum Investing Crushes Dollar-Cost Averaging

If your investment target has an annualized return of 8%, and you have NT$1,000,000 on hand, is it better to invest it all at once or split it into 100 installments? Remember, the assumption here is that you already have the NT$1,000,000.

Let’s first compare lump-sum investing with dollar-cost averaging, and then we’ll discuss how to invest.

Assuming NT$1,000,000 on Hand, 8% Annualized Return: Lump-Sum vs. DCA

Whether or not you know how to use a financial calculator, you can also plug the same conditions into an AI — the result will always show lump-sum investing beating dollar-cost averaging. Now that we know that with enough time, lump-sum investing significantly outperforms DCA, the next question is: how do you invest with peace of mind?

Understanding the Logic Behind Investment Returns

When you put the full NT$1,000,000 in, it immediately starts generating annualized returns. But if you split NT$1,000,000 into 100 installments, after 10 installments, 90 portions of your capital are still sitting idle. Of course the final amount from lump-sum investing will be higher. This is mainly because lump-sum investing has the full amount earning compound interest from day one, whereas dollar-cost averaging invests gradually, so the compounding effect is smaller in the early stages.

Who Is Dollar-Cost Averaging Best For?

1. Investors who don’t have a large sum — if you don’t have NT$1,000,000, don’t wait until you do to start investing.
2. Investors who lack confidence — DCA averages out market volatility risk while also reducing potential gains.
3. Investors building good habits — it helps cultivate long-term investing discipline.

3 Pieces of Evidence for Successful Lump-Sum Investing

Evidence #1: Your Investment Must Be Sufficiently Diversified

If you have a few hundred thousand NT$ and want to invest in individual stocks, think very carefully. No one can guarantee the stock you pick will be the next TSMC (Taiwan Semiconductor Manufacturing Company). This strongest Taiwanese stock has had a remarkable 30-year run, but we can’t predict the next 30 years. What if the industry shifts and technology more advanced than semiconductors emerges? Then you’d be gambling on whether the company can successfully pivot.

So how do you achieve diversified investing? You can refer to Affordable ETF 0050 vs. Luxury ETF VOO: Which Is Better for Your Long-Term Investment? for the concept. It’s not about whether 0050 or VOO is better — it’s about which one is more diversified.

In Taiwan, besides 0050, there aren’t many comprehensive ETFs, so let’s use 0050 for our discussion. For more comprehensive U.S. stock ETFs, let’s look at their holdings:

From this table, it’s clear that if I had a lump sum to invest, the most reassuring choice would be VT, because it spreads my capital across every market in the world, tracking the growth of about 10,000 companies globally.

Evidence #2: Your Time Horizon Must Be Long Enough

The second factor to consider for lump-sum investing is time. As long as time is on your side, the market will continue to grow, and profits will persist. In theory, 10 years or more is a great investment timeframe.

2000–2024 Performance Chart: VOO/VTI/VT/0050 — Four ETFs

Here are the annualized returns for VOO, VTI, and VT since their inception (as of 2023):

Evidence #3: 3 Mindsets for Successful Lump-Sum Investing

• The Power of Long-Term Compounding — Compound interest being the “eighth wonder of the world” is a famous quote attributed to Einstein. We all know the Jewish people are highly skilled with numbers, and Warren Buffett has also said that true wealth comes from holding assets long-term and letting compound interest work its magic. If you can pick a steadily growing investment and hold it long-term, your assets will grow significantly over time.
• Avoid Emotional Decisions — Human nature makes us reactive to market swings, especially during sharp drops or spikes. Many people can’t resist trading, and the worst thing is panic selling. Frequent market timing causes you to miss the best opportunities. The best investment approach is to buy and then “forget about it” — this really means staying calm and not letting emotions drive your decisions.
• Buffett’s “Buy and Hold” Strategy Warren Buffett is a champion of long-term investing. He emphasizes only investing in companies you understand and holding for decades. His style is trading time for growth, not relying on short-term market fluctuations. He once said, “Our favorite holding period is forever,” meaning as long as a company’s fundamentals haven’t changed, long-term holding will deliver greater returns — just like how he said he’ll hold Coca-Cola for life.

Frequently Asked Questions (FAQ)

Further Reading

Lazy Da’s Conclusion

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金融科技新創 CEO | 獨立財務顧問

This website has always emphasized the essence of financial planning. Because everyone’s financial DNA is different, we should use “mindset” to assess our own financial genes. Although our financial DNAs differ, we’re all like Eren Yeager from Attack on Titan — pursuing freedom. Although my personal favorite character is Hange Zoë

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