You have $5k to invest and you’re not sure whether you should be dollar cost averaging your money or investing the entire lump sum all at once. Which is the best option?
What Is Dollar Cost Averaging?
Dollar Cost Averaging (DCA) is where you invest a fixed amount at regular intervals (e.g. monthly) regardless of the share price, or the price of the ETF or index fund. So, you buy more shares when prices are low and less when prices rise.
Pros of Dollar Cost Averaging
- Invest Small Amounts of Money: You can invest regularly with small amounts, even as low as $100, which build up over time. You don’t need a large pot of money to start investing.
- Reduced Emotional Reactions: You are less likely to react during market volatility. By investing consistently, you avoid making impulsive decisions based on short-term market movements.
- Mitigating Bad Timing: With DCA you don’t time the market as you invest consistently regardless of whether the market rises or dips.
- Lower Risk: DCA spreads your investment over time, allowing you to capitalise on dips in the market so you can buy more shares and then realise the gains when the market rises again.
Risks of Dollar Cost Averaging
- Holding onto cash: You hold onto cash longer, waiting for the next investment interval. if this is during high inflation, the value of your cash is being eroded over time.
- Market Trends: Stock markets tend to go up over time, certainly that has been the case in the US. By holding onto cash and not investing in a lump sum you may miss out on potential gains.
Pros of Investing In A Lump Sum
- Immediate Market Exposure: Investing your entire lump sum right away means your money starts working for you immediately. The longer your investment horizon the better due to compounding.
- Potential for Higher Returns: As the market grows, so does your investment giving you the potential for high returns.
- Simplicity and Convenience: Investing a lump sum is straightforward. Invest it and watch your money grow.
- Eliminates Market Timing: Even the professionals can’t time the market so don’t try to. By investing a lump sum, you don’t need to think about timing the market as you invest it all in one go.
Risks of Investing a Lump Sum
- Market Volatility: Market fluctuations can affect the returns of lump sum investments. Diversification across different assets can help reduce this risk.
- Timing Risk: There is a chance that you invest then soon after, the market plummets. Conversely, you may invest when the market has dipped and when it increases you’ll realise gains.
- Inflation: Over time, inflation erodes the purchasing power of money. If your investment doesn’t outpace inflation, your lump sum’s real value may decrease.
- Interest Rate Changes: Interest rates may affect your investment e.g. rising interest rates can adversely impact bond prices.
- Concentration Risk: If you allocate your lump sum to a single investment or sector, you’re exposed to concentration risk. If you invest your lump sum in a single share, you may make lots of money or, worst-case scenario, you could lose all your money. Make sure you do your due diligence before investing. If you’re not sure what to invest in then consult a financial advisor.
- Psychological Risk: Investing a lump sum may make you feel nervous or fearful that the market will dip soon after and you could lose your money. Do your due diligence and know that you are buying and holding for the long term so your investment will be able to ride out the wave of market fluctuations over time.
Dollar Cost Averaging vs Investing a Lump Sum
Imagine you have $600 to invest either as a lump sum or via DCA.
Lump Sum
If you invest $600 and the share price is $10 then you will have 60 shares in that company.
DCA
If you take that $600 and invest it over 6 months then you are buying the share at fluctuating prices, averaging out the cost of the investment.
In this example, although the average cost per share is higher at $10.83 than if you invested a lump sum, you have a larger number of shares (65) than if you had invested the lump sum (60 shares).
The reason for this is that DCA’ing allows you to take advantage of the dip in the share price to $5, in month 4 where it halved compared to month 1.
| Timing | Amount | Share price | Number of Shares Bought |
| Month 1 | $100 | $10 | 10 |
| Month 2 | $100 | $20 | 5 |
| Month 3 | $100 | $10 | 10 |
| Month 4 | $100 | $5 | 20 |
| Month 5 | $100 | $10 | 10 |
| Month 6 | $100 | $10 | 10 |
| Total Invested | Average cost/share | Total Number of Shares Purchased | |
| $600 | $10.83 | 65 |
At this valuation point in month 6, you would have:
Lump sum: 60 shares @$10 = $600
DCA: 65 shares @ $10 = $650.
In this example, DCA has resulted in you having more shares and therefore a greater investment pot at the 6 month mark.
Vanguard Study On Dollar Cost Averaging
A Vanguard study found that on average Lump Sum Investing (LSI) outperformed DCA across 3 different geographical areas: the USA, the UK and Australia.
According to this Vanguard study:
“On average, by how much does LSI outperform DCA?
To calculate the average magnitude of LSI outperformance, we calculated the average ending values for a 60%/40% portfolio following rolling 10-year investment periods.
In the United States, 12-month DCA led to an average ending portfolio value of $2,395,824, while LSI led to an average ending value of $2,450,264, or 2.3% more. The results were similar in the United Kingdom and Australia: U.K. investors would have ended with 2.2% more and Australian investors with 1.3% more, on average.”
Using MSCI World Index returns for 1976–2022, a more recent study by Vanguard in 2023 found that LSI outperformed DCA 68% of the time across global markets measured after one year.
The study also found that both LSI and DCA are better than holding cash.
In Summary
Whether you LSI or DCA depends on your risk tolerance, whether you are emotionally resilient enough to withstand the inevitable fluctuations in the market and your investing time horizon.
Whichever method you choose, good luck with it!
Thanks for reading.
If you have any comments or questions please do so in the Comments section below.
DISCLAIMER: Inquisitive Finance operates on principles of exchange of knowledge, ideas and opinions and learning in the community. Your decisions are entirely your own responsibility, and I am in no way responsible for your actions. I am not a financial advisor. Whilst I strive to provide accurate and up-to-date information, I make no warranties or representations as to the accuracy or completeness of this information. Use common sense, do due diligence and where necessary, use the services of a licensed financial advisor, before making any financial decision and/or transaction.
