How SIP Works: The Complete Beginner's Guide to Systematic Investment Plans
What is SIP?
A Systematic Investment Plan (SIP) is a method of investing a fixed amount in mutual funds at regular intervals — monthly, quarterly, or weekly. Instead of investing a large lumpsum at once, SIP lets you invest as little as ₹100/month in small, manageable installments.
Think of SIP like a recurring deposit (RD) — but instead of a fixed return, your money gets invested in equity or debt mutual funds, which have the potential for higher long-term returns.
How SIP Works Mechanically
Here's exactly what happens when you set up a SIP:
- You choose a mutual fund and set up an auto-debit from your bank account
- On the chosen date each month, the amount is automatically invested
- Your money buys mutual fund units at the prevailing NAV (Net Asset Value)
- When markets fall, your money buys more units; when markets rise, fewer units
- Over time, your units accumulate and appreciate as the fund grows
Rupee Cost Averaging — The SIP Superpower
Rupee cost averaging is the most powerful concept behind SIP's success. Here's a simple example:
| Month | Investment | NAV | Units Bought |
|---|---|---|---|
| January | ₹5,000 | ₹100 | 50.00 |
| February | ₹5,000 | ₹80 (market fell) | 62.50 |
| March | ₹5,000 | ₹90 | 55.55 |
| April | ₹5,000 | ₹110 | 45.45 |
| Total | ₹20,000 | Avg: ₹94.50 | 213.50 units |
With ₹20,000 invested, you own 213.50 units. If you had invested ₹20,000 all in January at ₹100/unit, you'd have only 200 units. SIP's rupee cost averaging gave you 6.75% more units!
The Power of Compounding in SIP
Albert Einstein famously called compound interest "the eighth wonder of the world." SIP harnesses this through long-term equity investing. Here's what ₹5,000/month at 12% looks like over different timeframes:
| Duration | Invested | Total Value | Wealth Multiplier |
|---|---|---|---|
| 10 years | ₹6,00,000 | ₹11,62,000 | 1.94× |
| 20 years | ₹12,00,000 | ₹49,96,000 | 4.16× |
| 30 years | ₹18,00,000 | ₹1,75,50,000 | 9.75× |
Notice how the wealth multiplier nearly doubles from 4.16× to 9.75× just by staying invested for another 10 years. That's compounding at work — your returns generate their own returns.
SIP Return Formula
Use our free SIP Calculator to compute this instantly without any math.
How to Start a SIP in 5 Minutes
- Complete KYC on any fund platform (Groww, Zerodha Coin, Kuvera, etc.)
- Choose your mutual fund (index funds are great for beginners)
- Set the monthly amount and date
- Provide bank account for auto-debit
- Done! Your SIP starts automatically each month