A Systematic Investment Plan (SIP) lets you invest a fixed amount in a mutual fund scheme at regular intervals — usually every month. Instead of trying to guess the "right time" to invest, you build the habit of investing steadily, in line with your income.
Key points
- A SIP is a way of investing in a mutual fund, not a separate product.
- You buy more units when the NAV is low and fewer when it is high.
- SIPs can be started with small amounts and paused, increased or stopped later.
- A SIP does not guarantee returns or protect against losses in falling markets.
How does a SIP work?
You choose a scheme, an amount and a date. On that date every month, the amount is automatically debited from your bank account (through a one-time bank mandate) and invested at the applicable NAV. Over months and years, you keep accumulating units.
Rupee-cost averaging, simply explained
Because the amount you invest is fixed, a falling NAV buys you more units and a rising NAV buys fewer. Over time, this averages out your cost per unit. Here is an illustration:
| Month | Amount | NAV (₹) | Units bought |
|---|---|---|---|
| January | ₹5,000 | 50 | 100.00 |
| February | ₹5,000 | 40 | 125.00 |
| March | ₹5,000 | 45 | 111.11 |
| Total | ₹15,000 | 336.11 |
Your average cost works out to about ₹44.63 per unit (₹15,000 ÷ 336.11), which is lower than the simple average of the three NAVs (₹45). Figures are illustrative.
Rupee-cost averaging reduces the impact of timing, but it does not guarantee a profit. If markets stay low for a long period, the value of your investment can still be lower than what you invested.
Benefits of investing through a SIP
- Discipline: investing happens automatically, before you're tempted to spend.
- Affordable: many schemes allow SIPs from a few hundred rupees a month.
- No need to time the market: you invest across market highs and lows.
- Power of compounding: staying invested longer gives your money more time to grow.
- Flexible: you can increase (step-up), pause or stop a SIP as your situation changes.
SIP vs lumpsum: which is better?
Neither is better for everyone. A lumpsum suits money you already have, such as a bonus or maturity amount. A SIP suits regular income. Many investors use both — for example, a monthly SIP plus occasional lumpsum top-ups.
Practical tips for your SIP
Choose a SIP date a few days after your salary is credited, so the debit never bounces.
- Link each SIP to a specific goal — "Retirement", "Child's education" — so you know why you're investing.
- Consider a yearly step-up as your income rises.
- Avoid stopping SIPs just because markets have fallen; that is when your SIP buys more units.
- Review your investments at least once a year.
Try it yourself
Use the calculator below to see how a monthly SIP could grow under an assumed rate of return.
Returns from equity mutual funds are not guaranteed. Always check the scheme's riskometer and read the scheme documents before investing.
Want help setting up your first SIP? Get in touch.