A SIP — Systematic Investment Plan — is simply investing a fixed amount into a mutual fund every month, automatically. Instead of trying to guess the "right time" to invest a lump sum, you invest the same amount on the same date every month — ₹5,000, ₹10,000, whatever fits your budget — whether the market is up or down.
Think of it like a gym membership for your money. You don't get fit by one heroic workout; you get fit by showing up regularly. Wealth works the same way.
How a SIP actually works
Every month, your money buys units of the mutual fund at that day's price (called NAV). When the market is high, your fixed amount buys fewer units. When the market is low, the same amount buys more units. Over the years, your average purchase cost comes down. This is called rupee-cost averaging — and it's the quiet superpower of a SIP.
What ₹5,000 a month can become
SIPs grow through compounding — your returns earn returns. The numbers below assume a 12% annual return, which is close to the long-term average of Indian equity indices — though returns are never guaranteed.
₹5,000 a month for 30 years
Monthly SIP at an assumed 12% a year, compounded monthly
| Monthly SIP | 10 years | 20 years | 30 years |
|---|---|---|---|
| ₹5,000 | ₹11.6 lakh | ₹50 lakh | ₹1.76 crore |
| ₹10,000 | ₹23.2 lakh | ₹1 crore | ₹3.5 crore |
Illustration at an assumed 12% p.a., compounded monthly. Try your own numbers in the SIP calculator.
In the 30-year row for ₹5,000, you invested ₹18 lakh of your own money — the rest is compounding. This is why the most important SIP variable is not the amount, it's time.
What happens when the market falls?
Nothing needs to happen — and that's the point. A running SIP keeps buying units at the new, lower prices. Every past fall in Indian markets recovered, and SIPs that continued through the falls came out ahead of the ones that paused. Pausing your SIP in a fall is like walking out of a discount sale. Read more on why falls help SIP investors.
Getting started: the practical bits
- Start small but start now. Even ₹2,000/month builds the habit; you can increase it every year as income grows.
- Pick simple, low-cost funds first — a broad index fund tracking the Nifty 50 or Sensex is a common starting point.
- Match the fund to the goal. Money needed in 1–3 years should not be in equity SIPs; long-term goals (10+ years) can carry more equity.
- Step-up when you can. Increasing your SIP by even 10% a year changes the final number dramatically — see it in the step-up SIP calculator.
Confused about where to start?
Ask your question on WhatsApp — questions on any topic covered on this site are answered free.
Message IFI on WhatsApp →Quick recap
- A SIP = automatic monthly investing into a mutual fund.
- Falls in the market help a running SIP buy units cheaper (rupee-cost averaging).
- Time matters more than the amount — start now, increase later.
- Equity SIPs are for long-term goals only.
Frequently asked questions
What is the minimum amount to start a SIP?
Many mutual funds in India accept SIPs from ₹500 a month, and some allow even smaller amounts. The exact minimum is set by each fund and is listed in its scheme documents.
Can I stop or pause a SIP at any time?
In most open-ended mutual funds, yes — you can stop a SIP without a penalty, and the units you already hold stay invested. Some funds charge an exit load if you redeem units within a set period, and ELSS tax-saving funds lock each instalment in for 3 years.
Is a SIP better than a lump sum?
Neither is always better. A SIP spreads your buying over time, which reduces the risk of investing everything just before a fall, and it fits a monthly salary. A lump sum invested early can grow more if markets rise steadily. For most salaried investors, a SIP is the easier habit to keep.
How is SIP return measured?
Because money goes in every month, SIP returns are measured with XIRR, not CAGR. CAGR only fits a single lump-sum investment.