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DCA vs Lump Sum — Which Wins?

You have a sum of money to invest. Do you deploy it all now or spread it over time? The maths — and the psychology — explained side by side.

Your situation
💰 Lump Sum — invest everything now
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VS
📅 DCA — invest monthly over 12 months
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Research basis: Vanguard (2012). "Dollar-cost averaging just means taking risk later" — found LS outperforms DCA approximately 66% of the time across US, UK and Australian markets over 10-year rolling periods. Brennan, M. & Li, F. (2008). "Agency and Asset Pricing." — market timing costs for retail investors. Calculations assume consistent returns; actual markets are volatile and past performance does not predict future returns.
Portfolio growth over time
The research says
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Lump Sum wins ~68% of the time historically in diversified equity markets. Markets trend upward more often than they fall — waiting usually means buying at higher prices.
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DCA wins in bear markets and volatile periods. When markets are falling, spreading your entry reduces average cost. In 2022, DCA would have significantly outperformed lump sum.
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DCA is better for most people psychologically. If a crash right after lump sum would make you panic-sell, DCA protects against your own behaviour — and behaviour risk is real.
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The best strategy is the one you'll stick to. The difference between LS and DCA is usually 1–2% over 20 years. The difference between investing and not investing is enormous.
📈 Compound Growth 🎯 FIRE Calculator 💧 DRIP Forecaster ⚖️ Is It Worth It?
Is dollar cost averaging better than lump sum investing?
Research (including Vanguard's landmark study) shows lump sum investing outperforms DCA about two-thirds of the time, because markets rise more often than they fall. However, DCA reduces the risk of investing at a peak, and is the natural strategy for people investing regular income. If you have a lump sum and strong conviction, invest it all at once. If volatility keeps you from investing, DCA wins by getting you invested at all.
What does this DCA vs lump sum calculator show?
This calculator compares two strategies over a set investment period. Lump sum: the full amount invested on day one. DCA: the same total amount split into equal monthly instalments. The chart shows the final portfolio value for each strategy at the same assumed return rate. Use it to see how much you could gain or lose by spreading vs committing early.
When does DCA beat lump sum?
DCA wins in falling or highly volatile markets — if prices drop after you start investing, your later DCA purchases buy more units at lower prices. DCA also wins psychologically: spreading investments removes the fear of "buying at the top." In a bear market or at a market peak, DCA can significantly outperform. The simulator above lets you model different return scenarios to see this.