When the market falls and the SIP is due

The arithmetic first

A fixed rupee instalment buys more units when the NAV is low. That is not a slogan; it is division.

Which means the instalments made during a fall are the ones doing the most work — and they are precisely the ones people skip, because a falling market is when continuing feels most irrational.

Stopping a SIP during a drawdown removes the cheapest units from the plan. Whether that matters to the final outcome depends entirely on whether the market recovers, which nobody knows in advance — but the mechanical effect is certain, and it is worth seeing clearly before the decision arrives rather than during it.

The honest version, stated once: this is an argument about mechanism, not a promise about outcomes. Markets have recovered from every fall so far, and “so far” is load-bearing.

There are only two reasons to stop

And they need opposite responses, which is why generic advice fails here.

Before doing anything, answer which one this is. Almost everyone who stops in a crash describes it as the first and is experiencing the second, and the two are easy to distinguish with one question: has my income or my expenses actually changed?

If it is cashflow

Then stopping is correct, and there is no virtue in continuing.

Investing borrowed money — on a credit card, or by running down the emergency fund to zero — to keep a SIP alive is a clear error. The certain interest cost or the loss of resilience exceeds any averaging benefit, and it inverts the order of operations.

Three things that make the pause less costly:

• Pause rather than cancel. Most fund houses allow it, the mandate stays alive, and restarting is a click rather than a fresh registration.
• Reduce rather than stop, if you can. A smaller instalment keeps the habit and the mandate intact, and the habit is worth more than the difference.
• Set a resume date now, not “when things improve”. Paused SIPs that depend on a feeling tend not to resume.

If it is fear

Then the SIP is not the problem and stopping does not fix anything. Something upstream is wrong, and it is worth identifying which.

The allocation is too aggressive for you. If a fall of this size is intolerable, the equity share is wrong — and the fix is to change the allocation deliberately, not to stop contributing. Note that selling into the fall to correct it crystallises the loss; adjusting future contributions does not.

The horizon was wrong. If this money is needed within a few years, it should not have been in equity, and that is a horizon mismatch rather than a market problem. Fix it — but understand that fixing it during a drawdown means realising the loss, and the alternative of holding on with money you need soon is its own risk.

The instalment is too large. An amount that feels fine in a rising market and frightening in a falling one was probably sized for the rising market.

In all three cases the useful action is to correct the input rather than abandon the process. Stopping and restarting after the recovery is visible is the specific behaviour that produces the behaviour gap — it converts a paper drawdown into a realised one and then re-enters higher.

Should you invest more?

The natural counter-question, and it deserves an honest answer rather than an encouraging one.

Adding to a SIP during a fall buys more units at lower prices, and it is a reasonable thing to do if the money is genuinely spare — not the emergency fund, not money needed within a few years, and not borrowed.

Two cautions. Nobody knows where the bottom is, and a fall of 30% can become a fall of 50% — averaging down works over the full cycle and can be painful for a long time first. And deploying spare cash faster reduces the buffer that lets you sit through the rest of the fall, which is the thing actually keeping you invested.

A middle path that avoids most of the regret: increase the instalment modestly and permanently rather than making a large one-off addition. It captures much of the benefit without requiring a call on the bottom.

The decision is made before the crash

Everything above is far easier for someone who settled it in advance, and nearly impossible to reason through calmly in the third week of a fall.

1. Size the instalment so it survives a bad year. If you would stop at a 30% drawdown, the amount or the allocation is wrong today.
2. Hold an emergency fund so a cashflow shock does not force a decision about the SIP at all. This is the single most effective protection.
3. Match horizon to instrument so short-term money is never exposed to this question.
4. Write down, now, what you will do if the portfolio falls 30%. One page. It exists to be read by a version of you who is not thinking clearly.

Testing what you could actually sit through

The useful question is not what a fund returns. It is how far it has fallen, and for how long — because that determines whether you would still be holding it.

FNOTrader's Mutual Funds app runs contribution schedules against real NAV history — around 34 million NAV rows — reporting XIRR alongside maximum drawdown, and rolling returns across every start date.

Run your intended instalment through the worst historical window for your fund. If the drawdown along that path is one you would have abandoned, the plan needs changing now — not during the next fall.

FNOTrader is not a SEBI-registered investment adviser and this is not investment advice.

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