Should I Invest a Lump Sum or Dollar-Cost Average?
The Short Answer
Historically, lump-sum investing beats DCA about 68% of the time. However, DCA reduces regret risk and is better if you'd panic during a downturn.
The Detailed Breakdown
Comparison based on Vanguard's historical analysis of lump sum vs. DCA over rolling 12-month periods.
| Calculation | Value | Assumptions |
|---|---|---|
| Lump Sum (Invest All Now) | $55,000 after 1 year | $50K invested immediately at 10% return |
| DCA Over 12 Months | $52,700 after 1 year | $4,167/mo over 12 months at 10% return |
| Lump Sum Advantage | $2,300 (avg) | Lump sum wins ~68% of the time historically |
Key Assumptions
- 10% average annual market return.
- DCA spread evenly over 12 months.
- Cash waiting to invest earns 0% (conservative).
- Based on historical S&P 500 data.
Adjust for Your Situation
Invest the lump sum if you can handle volatility; DCA if you need peace of mind.
Use the Free CalculatorWhat Affects This Result
Market Conditions
DCA wins in declining markets; lump sum wins in rising markets.
Psychology
DCA feels safer and prevents panic selling.
Opportunity Cost
Cash waiting to invest loses to inflation.