What is a SIP?
What is it?
A SIP (Systematic Investment Plan) is a fixed amount automatically debited from your bank account at a set interval — usually monthly — and invested into a mutual fund of your choice. Each installment buys units at that day's NAV, so you naturally buy more units when the NAV is low and fewer units when the NAV is high, a pattern known as rupee-cost averaging.
Why should you care?
SIPs remove the need to time the market or invest a large lump sum at once. By investing a fixed amount regularly regardless of market conditions, you spread your purchase price across market ups and downs instead of betting everything on a single day's NAV — and the automatic debit builds a savings habit without requiring active decisions every month.
Real-life example
A ₹5,000/month SIP running for 3 years means 36 installments totaling ₹1,80,000 invested. Each month's ₹5,000 buys a different number of units depending on that month's NAV — more units in months the market dips, fewer in months it rises. Over the full 3 years, this averages out your purchase price, versus investing the full ₹1,80,000 in one lump sum on a single day, which could have been a market high or a market low.
Common mistakes
- Stopping a SIP during a market downturn — that's exactly when the fixed amount buys the most units per rupee, so pausing removes the benefit rupee-cost averaging is designed to capture.
- Treating a SIP as a guaranteed-return product — it's simply a disciplined way of investing in a market-linked fund, and the fund can still lose value over any given period.
- Starting a SIP amount that isn't sustainable long-term, then stopping it a few months in — consistency over years matters more than the size of any single installment.
How a ₹5,000 monthly SIP buys a varying number of units
| Month | NAV | Units bought (₹5,000 ÷ NAV) |
|---|---|---|
| Month 1 | ₹50 | 100.00 units |
| Month 2 (market dips) | ₹40 | 125.00 units |
| Month 3 (market rises) | ₹62.5 | 80.00 units |
FAQ
Is a SIP a separate investment product from a mutual fund?
No. A SIP is just a method of investing — a recurring, automated purchase — into a regular mutual fund scheme. You're still investing in the same fund you'd choose for a lump-sum investment; you're just spreading the purchases out over time instead of investing all at once.
What happens if I miss a SIP installment?
Typically nothing severe — most AMCs simply skip that installment if there are insufficient funds in your account, though your bank may charge a mandate-failure fee. Missing occasional installments won't cancel your SIP, but it does mean fewer units bought during that period, and repeated failures can eventually lead to automatic cancellation.
Should I stop my SIP when the market falls?
Generally no — a falling market means your fixed SIP amount buys more units at a lower NAV, which is exactly the rupee-cost averaging benefit a SIP is meant to capture. Stopping during a downturn and restarting after prices recover often means missing out on units bought cheaply.
Can I change or stop my SIP amount later?
Yes. Most platforms let you increase your SIP amount (a "step-up" SIP), pause it temporarily, or stop it altogether whenever needed, though it's worth checking if your specific SIP mandate has any lock-in or minimum-installment conditions first.
See this concept applied to your own portfolio
Get Started - It's FreeFundSageAI is an analytics platform. Academy lessons are for educational purposes only and do not constitute financial advice. Always consult a SEBI-registered investment advisor for personalised recommendations.