Dollar-Cost Averaging

Dollar-Cost Averaging — called rupee-cost averaging in Indian mutual fund literature — is the practice of investing a fixed amount of money at regular intervals into the same security, regardless of its price on that day. Every SIP in India, every 401(k) payroll contribution in the US, and every standing-order ISA transfer in the UK is DCA in action. The purpose is not to maximise returns but to eliminate the emotional whip of trying to time markets and to smooth out the entry price across market cycles.

The mechanic is straightforward: if you invest ₹10,000 every month into a fund whose NAV fluctuates between ₹80 and ₹120, your fixed rupees buy 125 units at ₹80 and only 83 units at ₹120. Your average cost per unit over the cycle sits below the simple arithmetic average of NAVs — the mathematical "edge" of DCA. Over a full market cycle of 5–10 years, this can translate to an extra 1–2% CAGR versus a lump sum invested at a market peak.

DCA is weaker than lump-sum investing in markets that trend uniformly upward (academic studies show lump-sum wins about 66% of the time historically). But DCA is emotionally sustainable — which, for most retail investors, trumps theoretical optimality.

Project DCA outcomes on different return assumptions using our SIP calculator — experiment with step-up SIP and lump-sum top-ups on market dips.