What Is Dollar-Cost Averaging?
In Plain English:
One of the most common questions people ask when they start investing is: "When is the right time to get in?"
It's a reasonable question. Nobody wants to invest a significant amount of money and then watch the market drop the next day. The problem is that nobody — not professional fund managers, not economists, not financial media — can consistently predict the right moment to invest.
Dollar-cost averaging is the strategy that sidesteps that question entirely.
What it actually means
Dollar-cost averaging (DCA) simply means investing a fixed dollar amount at regular intervals — weekly, bi-weekly, or monthly — regardless of whether the market is up, down, or somewhere in between.
The result is straightforward: when prices are higher, your fixed amount buys fewer shares. When prices are lower, it buys more. Over time, your average cost per share naturally smooths out across different market conditions.
If you contribute to a 401(k) from every paycheck, you're already doing this without thinking about it.
A simple way to think about it
Imagine you invest $200 every month into the same fund. Here's what happens across three months:
Month 1: Share price is $50 — your $200 buys 4.0 shares
Month 2: Share price drops to $40 — your $200 buys 5.0 shares
Month 3: Share price rises to $55 — your $200 buys 3.6 shares
You've invested $600 total and own 12.6 shares. Your average cost per share is about $47.60 — lower than the current price of $55. The down month wasn't a loss. It was an opportunity to accumulate more shares at a lower price.
Why timing the market is a losing game
Research from Wells Fargo Investment Institute found that over a 30-year period, missing just the best 30 days in the S&P 500 brought average annual returns from approximately 8.0% down to 1.8% — below the average rate of inflation. The market's best days often come without warning, and frequently follow periods of uncertainty, exactly when many investors have already moved to the sidelines.
The DALBAR Quantitative Analysis of Investor Behavior, which has tracked investor behavior for more than 30 years, shows that the average equity fund investor consistently earns less than the market itself — largely because of poorly timed decisions to move in and out. In 2024, the gap between average investor returns and S&P 500 returns was 8.48 percentage points.
Dollar-cost averaging doesn't require predicting anything. You invest. You stay invested. You let time do the work.
What it is — and what it isn't
Research from Vanguard has found that investing a lump sum all at once tends to outperform DCA about two-thirds of the time, simply because markets rise more often than they fall. But most people don't have a lump sum to invest — they have a paycheck. DCA is exactly how regular paycheck-based investing works. It removes emotion from the equation, encourages consistency, and keeps investors participating in the market through all conditions — which is itself one of the most powerful factors in long-term wealth building.
Bringing it back to your plan
Dollar-cost averaging isn't a magic formula, and it doesn't guarantee a profit or protect against loss in a declining market. What it does is give you a disciplined framework for participating in the market consistently. If you have questions about how your contributions are structured, we're always happy to connect.
Sources: Wells Fargo Investment Institute, Perils of Timing Volatile Markets (2024); DALBAR, Inc., Quantitative Analysis of Investor Behavior (2025); Vanguard Research, Invest Now or Temporarily Hold Your Cash?
Disclosure: This article is intended for educational purposes only and does not constitute investment advice. Dollar-cost averaging does not guarantee a profit or protect against a loss in declining markets. All investing involves risk, including the possible loss of principal. Past performance is not indicative of future results. Please consult with your financial advisor to discuss strategies appropriate for your individual situation.