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Mutual Fund Basics: NAV and SIP vs Lump Sum

Two of the most-searched beginner questions — and two of the most misunderstood. Here's what each really means, with examples.

NAV — and why a "low" NAV is not "cheap"

Net Asset Value is the per-unit price of a fund: the value of everything it owns, minus liabilities, divided by the number of units. It's calculated once each business day after markets close, and it's the price at which you buy and sell.

Example. Fund A has an NAV of ₹15; Fund B has an NAV of ₹500. Both rise 10% this year. Invest ₹1,00,000 in either and you end with ₹1,10,000 — identical. Fund A gives you more units (about 6,667 vs 200), but each unit is worth proportionally less. The number of units is irrelevant; only the percentage growth matters.

How to read it: NAV is just a price tag reflecting how long a fund has existed — not how cheap or good it is. Never let anyone sell you a fund (or a New Fund Offer at ₹10) on the idea that a low NAV has "more room to grow." That's false.

SIP vs lump sum — it's about cash flow and temperament

A SIP invests a fixed amount at regular intervals; a lump sum invests a large amount at once. Same fund — the difference is when the money goes in.

Example. Suppose a fund's NAV over four months is ₹100, ₹80, ₹125, ₹100. With a ₹10,000 monthly SIP, you buy 100 units, then 125 (when it's cheap), then 80, then 100 — 405 units for ₹40,000, an average cost of about ₹98.8 per unit, below the simple average price of ₹101. That's rupee-cost averaging: you automatically buy more when prices are low. A ₹40,000 lump sum at the start would have bought 400 units at ₹100 — fine if markets rise from there, worse if they fall first.

How to read it:

  • SIP suits investing from monthly income, building discipline, and removing the "is now a good time?" stress — the default for most salaried investors.
  • Lump sum suits money you already have idle (a bonus, a maturity) with a long horizon; historically, time in the market tends to beat waiting, though the start is bumpier. A middle path is an STP, moving a lump sum gradually from a liquid fund.

The biggest mistake: stopping a SIP when markets fall. That's exactly when it does its best work — buying units cheaply. Pausing locks in the downside and misses the recovery.

The AlphaPicker angle

Neither NAV nor your contribution method creates returns — the fund does. We help with the decision that actually matters: which fund deserves your SIP or lump sum, judged by genuine skill rather than the recent performance you might be tempted to chase.

Educational information only, not investment advice. Mutual funds are subject to market risk; past performance is not indicative of future results. Consult a SEBI-registered investment adviser for advice specific to you.