Why Stopping Your SIP During a Market Crash Costs You More Than You Think
When headlines flash bright red, stock indices tumble 15% to 30%, and TV anchors warn of impending global recession, human survival instinct triggers a powerful urge: “Stop the bleeding. Pause my SIPs. I’ll restart when the market stabilizes.”
It sounds like common sense. In financial mathematics, however, it is the single most catastrophic mistake an equity mutual fund investor can make. Pausing your SIP during a correction is the financial equivalent of going to a 40% discount festival and refusing to buy because prices are too low!
The Math of Unit Accumulation: The NAV Discount Engine
When you invest through a SIP, you do not buy rupees—you buy mutual fund units. The formula governing your purchase is straightforward:
Consider what happens to a ₹10,000 monthly SIP during a market crash:
- During Bull Market Peak (NAV = ₹100): Your ₹10,000 buys 100 units.
- During Market Crash (NAV crashes 40% to ₹60): Your ₹10,000 buys 166.6 units!
You get 66.6% more units for the exact same amount of money! When the market inevitably recovers back to its previous peak of ₹100, those 166.6 units purchased at ₹60 are now worth ₹16,660—a 66.6% absolute gain on that single month’s installment.
If you pause your SIP during the crash, you accumulate zero discounted units. When you finally muster the courage to restart after the market “stabilizes” at new highs, you resume buying expensive units again, permanently dragging down your portfolio’s lifetime Internal Rate of Return (XIRR).
Real-World Case Study: The 2020 Covid Crash
In March 2020, as the Covid-19 pandemic unfolded, the Indian Nifty 50 crashed approximately 38% in less than 4 weeks. Fear was palpable. Let us look at what happened to two real investors:
Investor A: The Panicker
Stopped their ₹15,000 SIP in March 2020. Waited for economic clarity and restarted only in November 2020, after the Nifty had already rebounded past pre-Covid highs. Missed out on the cheapest mutual fund units of the decade.
Investor B: The Disciplined Accumulator
Kept the ₹15,000 auto-debit running uninterrupted through March, April, May, and June 2020. Bought massive quantities of units at rock-bottom NAVs. By 2024, Investor B’s portfolio value was over ₹14 lakh higher than Investor A’s!
The High Cost of Missing the Best Market Days
Academic research across global and Indian equity markets consistently demonstrates that market recoveries are swift, unpredictable, and concentrated in a tiny handful of trading sessions.
Over a 20-year period, missing just the top 10 best trading days cuts your final returns in half! And when do those best single-day rallies occur? Almost exclusively in the middle of severe bear markets. Because retail investors cannot time these violent up-days, continuing your SIP is the only guaranteed way to capture them.
The 3-Step Survival Guide for Market Corrections
- Automate and Stop Checking Daily NAVs: The primary reason investors panic is daily portfolio monitoring. When markets plunge, delete the tracking app from your phone. Let the automated bank mandate do its job.
- Ensure Your Emergency Buffer is Intact: If you have 6 months of living expenses safely parked in bank fixed deposits or liquid funds, you will never be forced to redeem equity investments during a market depression.
- Deploy Tactical Lumpsums if You Have Spare Cash: If the market falls 20% or more, don’t just continue your SIP—consider deploying extra surplus cash to accelerate your wealth compounding.