Everything else on this site argues that a long-running SIP through market crashes works. This guide shows it, using the actual daily NAV history of a real Indian index fund rather than an assumed return.
Every figure below is computed from the record. Where the answer is less flattering than the usual marketing claim, it is stated as computed.
The setup
₹10,000 a month, into a Nifty 50 index fund's Regular plan (Growth option), from April 2006 to July 2026 — 244 instalments across twenty years and four months.
An index fund is used deliberately: it removes manager skill from the story entirely, so what remains is the mechanics of the SIP itself. The Regular plan is used because it is what most investors of that era actually held; a Direct plan investor would have done better.
The fund's NAV went from ₹22.06 to ₹168.95 over the period.
The result
- Invested: ₹24,50,000
- Final value: ₹86,75,141
- XIRR: 11.18%
- Multiple: 3.54× the money contributed
Note the number, because it is not the number usually quoted. 11.18%, not 15% or 18%. That is what a broad Indian index fund actually delivered to a monthly investor across two decades that included two of the worst crashes in modern market history — after the fund's costs, in the more expensive plan.
₹24.5 lakh became ₹86.75 lakh. That is a genuinely life-changing outcome, and it came from an unremarkable return applied for a very long time.
What it felt like along the way
The final number tells you nothing about the experience. These do.
October 2008, 31 instalments in. ₹3,10,000 contributed. Portfolio value: ₹1,88,708. Down 39% on everything invested to that point — two and a half years of disciplined saving showing a loss of over a lakh.
March 2009, at the trough. ₹3,60,000 contributed. Portfolio value: ₹2,36,364. Still down 34%, three years in.
Consider what that meant at the time. Three years of doing exactly the right thing, and the account showed a third less than the money put into it. Every piece of news said it would get worse. This is the moment the strategy is actually decided.
March 2020, at the COVID trough. ₹16,80,000 contributed, worth ₹22,46,027 — still up 34%, because fourteen years of accumulated units absorbed a crash that took roughly a third off the index in weeks. Later crashes hurt proportionally less, because the base is larger.
The three counterfactuals
Counterfactual 1 — stopped the SIP in January 2009, left the money invested.
₹3,30,000 contributed in total. Final value: ₹21,75,514.
The money already invested still compounded to 6.6× the contribution — the units bought in 2006–08 did their work regardless. But against the ₹86.75 lakh of the investor who continued, stopping the SIP at the bottom cost roughly ₹65 lakh. Not from selling. Purely from not continuing to buy.
Counterfactual 2 — panicked and redeemed at the March 2009 trough.
Received ₹2,36,364 on ₹3,60,000 invested — a realised loss of ₹1,23,636, and no participation in anything that followed.
Counterfactual 3 — the value of starting early.
The first five years of instalments totalled ₹6,10,000 — one quarter of all the money contributed. Those units are worth ₹38,17,857 today: 44% of the final corpus from 25% of the money.
The last five years of instalments also totalled ₹6,10,000. They are worth ₹7,40,064.
Same rupees. Six times the outcome, purely from being invested fifteen years longer. This is the entire argument of compounding, measured rather than asserted.
What the numbers actually establish
1. The crash years were the productive ones. The instalments made in 2008 and 2009 bought units at NAVs the fund never revisited. They are among the most valuable units in the portfolio. Rupee-cost averaging is not a slogan here — it is where a large share of the return came from.
2. The realistic long-run number is around 11%, not 15%. Plan with it. A retirement projection built on 15% is not conservative-with-a-margin; it is a different plan.
3. Continuing mattered more than choosing. The gap between continuing and stopping was ₹65 lakh. No amount of fund selection produces a difference of that size.
4. Three years of loss is a normal experience, not a signal. Anyone using a three-year return to judge would have quit in 2009, at exactly the wrong moment. See rolling vs trailing returns.
5. Early money is different money. The first quarter of the contributions did nearly half the work — which is why delay is the expensive decision.
The honest caveats
- One fund, one period, one country. Twenty years is one sample. A different start date gives a different number — that is exactly the point of sequence risk.
- This is an index fund's record. An actively managed fund could have done better or considerably worse.
- Tax is not deducted. Redeeming ₹86.75 lakh would realise a substantial capital gain; a staged withdrawal via an SWP would be far more efficient than a single sale.
- The Regular plan's costs are included. Direct would have finished higher.
- Past returns are not a forecast. They establish what the mechanism has done, not what it will do.
Key takeaway
₹10,000 a month for twenty years into an ordinary index fund turned ₹24.5 lakh into ₹86.75 lakh — an XIRR of 11.18%, not the 15% the pitch usually assumes. Getting there required sitting through a portfolio that was down 39% three years in, and the instalments bought during that period were among the most valuable in the whole portfolio. Stopping the SIP at the 2009 bottom — without even selling — cost about ₹65 lakh; and the first five years' contributions, a quarter of the money, produced 44% of the final corpus. Start early, keep going, and plan against 11% rather than 15%.
More in Module 10 — Case studies, audits and what comes next
Anatomy of a legendary fund run — and why it ended
The five phases every great run follows, why most investors arrive at phase four, and how to separate skill from a style tailwind using numbers rather than the story.
Case study: what went wrong when a debt fund froze
Six schemes, ₹25,000 crore, redemptions stopped overnight — and the defining fact that it was a liquidity failure rather than a default wave.
Your annual portfolio audit: a step-by-step health check
Ninety minutes, once a year, in six parts — where the default action at every step is to do nothing, because the audit exists to catch drift rather than generate trades.
AI and algorithms in fund management: hype and reality
Inside Indian AMCs it does operations and compliance, not stock picking. Why predictive advantage is structurally hard, and what SEBI now requires.
Blockchain and tokenisation: the future of fund record-keeping
The Indian record is already electronic and reconciled — so what is actually being attacked is the cost of intermediaries agreeing on it.
AMC apps vs third-party platforms: where should you invest?
The route matters far less than the plan. A 'free' platform selling Regular plans is paid through the expense ratio you pay daily.
AIFs, PMS and mutual funds: what the ₹1 crore actually buys
Not a premium version of mutual funds — a different perimeter where you trade liquidity, transparency and tax treatment for access to assets funds cannot hold.
Thirty years back, thirty years ahead: how Indian funds evolved
Nearly every protection you rely on exists because something failed. Which incident produced which rule, and what is likely, uncertain and unlikely next.
Your master plan: a 30-year wealth blueprint
The five decisions that determine the outcome, ranked — fund selection comes fifth — the blueprint by life phase, and the seven-line policy statement to write today.