The basic idea
Dollar-cost averaging (DCA) is investing the same amount of money at regular intervals - usually monthly - regardless of whether markets are up or down that week. You buy more units when prices are lower and fewer when prices are higher, so your average entry price sits somewhere between the highs and lows of the period.
In the UK the same approach is often called pound-cost averaging when you invest a fixed amount in pounds. The maths is identical; only the label changes. It is not a magic formula for beating the market - it is a behaviour-friendly way to build a habit: auto-invest £50 or $100 each month rather than waiting for the "right moment" that rarely arrives.
DCA vs lump sum
If you already have a large sum in cash, maths often favours investing it sooner rather than dribbling it in over years - because markets tend to rise over long horizons and early exposure captures more growth. That said, psychology matters. Many people prefer DCA because it reduces the fear of investing everything the day before a drop.
AltPath lets you replay both stories with real prices. Run the same ticker as a one-off lump sum, then as a monthly schedule from the same start date. Compare total return, worst drawdown, and how steady the journey felt.
What DCA works well for
Regular earners topping up an ISA or workplace pension. Beginners who want a simple rule: same day each month, same amount, diversified fund. Anyone who gets paid monthly and wants investing to feel like a bill, not a gamble.
- Salary investing - align with payday.
- Windfalls split over time - if a full lump sum feels stressful.
- Volatile single stocks where timing anxiety is high.
- Learning - seeing how different start dates changed outcomes historically.
Fees, funds, and realism
DCA into a low-cost global ETF (for example VWRL on the London Stock Exchange) is a common UK pattern. Platform fees, fund OCF, and FX still apply in real life; AltPath focuses on price history, not your broker's charges.
Past monthly investing results do not predict the future. A decade where DCA looked brilliant may be followed by a flat period. Use historical calculators to understand range and volatility, not to forecast riches.
