A Systematic Investment Plan (SIP) is a way of investing in a mutual fund by putting in a fixed amount at regular intervals — usually every month — instead of investing one large sum at once. The amount is debited automatically from your bank account on a date you choose, and you receive mutual fund units at that day's price (the NAV).
For many people, a SIP is the simplest way to build the habit of investing from their monthly income.
How a SIP works, step by step
- You choose a scheme, an amount and a date. Many schemes accept SIPs from as little as ₹500 a month.
- A bank mandate is set up. This lets the fund house debit your account automatically on the SIP date.
- Units are allotted at the day's NAV. If the NAV is ₹50 and your SIP is ₹5,000, you receive 100 units.
- Units accumulate over time. The value of your investment is the total units you hold multiplied by the current NAV.
You can usually pause, increase, decrease or stop a SIP at any time. There is generally no penalty for stopping, although an exit load may apply if you redeem units within a short period.
Rupee-cost averaging
Because you invest the same amount every month, you automatically buy more units when prices are low and fewer units when prices are high. Over time, this tends to smooth out your average purchase cost.
| Month | Amount invested | NAV | Units bought |
|---|---|---|---|
| 1 | ₹5,000 | ₹50 | 100.0 |
| 2 | ₹5,000 | ₹40 | 125.0 |
| 3 | ₹5,000 | ₹45 | 111.1 |
In this example, you invested ₹15,000 and bought 336.1 units — an average cost of about ₹44.6 per unit, lower than the simple average NAV of ₹45.
Rupee-cost averaging reduces the impact of timing, but it does not guarantee a profit or protect against losses in a falling market.
The power of compounding
When your investments earn returns, and those returns stay invested, they start earning returns of their own. This is compounding, and its effect grows the longer you stay invested. That is why the time you stay invested usually matters more than the exact day you start.
You can try different amounts, return assumptions and time periods in our SIP calculator to see how this plays out.
SIP or lump sum?
Neither is better in every situation:
- A SIP suits regular monthly income and removes the pressure of picking the "right" time.
- A lump sum may suit someone who already has a large amount to invest, such as a bonus or maturity proceeds.
- Some investors park a lump sum in a lower-risk fund and move it gradually into equity through a Systematic Transfer Plan (STP).
Questions to ask before you start
- What is the goal and when do I need the money? Short-term goals and long-term goals usually call for different types of funds.
- How much volatility am I comfortable with? Equity funds can fall sharply in the short term.
- Is my emergency fund in place? It helps to have three to six months of expenses set aside before investing for the long term.
- What are the costs? Check the expense ratio and any exit load in the scheme documents.
Key takeaways
- A SIP is a disciplined, automated way to invest a fixed amount regularly.
- Rupee-cost averaging and compounding work best over long periods.
- Choose funds based on your goal, time horizon and risk comfort — and review them periodically.
If you would like help understanding the options available, our team is happy to walk you through them.
