What is SIP and How Does It Work? (Beginner Guide)
1. What is a Systematic Investment Plan?
A Systematic Investment Plan, commonly known as a SIP, is a structured investment method offered by mutual funds in India. It is not an independent asset class or financial product; rather, it is a method of investing money. Through a SIP, an investor commits to investing a predetermined, fixed sum of money at specified, recurring intervals into a selected mutual fund scheme.
This contrasts with a lumpsum investment, where an investor deposits a single large sum of capital into a fund at one specific time. SIPs automate the investment process, encouraging disciplined savings directly from an investor's bank account.
2. The Mechanics of Unit Allocation: Net Asset Value (NAV)
When you invest in a mutual fund, your capital is pooled with that of other investors. The asset management company (AMC) uses this pool to buy securities. To track your individual share of the pool, you are allocated mutual fund "units".
The price of a single mutual fund unit is known as the **Net Asset Value (NAV)**. The NAV is calculated at the end of each business day by dividing the total net assets of the mutual fund scheme by the total number of outstanding units.
Formula: Units Allocated = Installment Amount / Net Asset Value (NAV)
For example, if your monthly SIP installment is ₹5,000, and the NAV of the chosen fund is ₹100 on the day of the transfer, you are allocated exactly 50 units (5,000 / 100). If the next month the NAV rises to ₹125, your ₹5,000 installment will purchase exactly 40 units (5,000 / 125).
Illustrative Example of Monthly Unit Allocations
Here is a factual illustration of how units are accumulated over a 6-month period with a flat monthly SIP installment of ₹5,000 in a fluctuating market:
| Month | SIP Installment (₹) | Net Asset Value (NAV) (₹) | Units Purchased |
|---|---|---|---|
| Month 1 | 5,000 | 100.00 | 50.000 |
| Month 2 | 5,000 | 95.00 | 52.632 |
| Month 3 | 5,000 | 90.00 | 55.556 |
| Month 4 | 5,000 | 105.00 | 47.619 |
| Month 5 | 5,000 | 110.00 | 45.455 |
| Month 6 | 5,000 | 102.50 | 48.780 |
| Total | 30,000 | N/A | 300.042 |
In this illustrative scenario, the total investment is ₹30,000, and the total units accumulated are 300.042. If the NAV at the end of the 6-month period is ₹102.50, the market value of the investment is calculated as: 300.042 units × ₹102.50 = ₹30,754.31.
3. Key Administrative Parameters of SIPs
SIPs are governed by operational guidelines set by the Association of Mutual Funds in India (AMFI) and mutual fund houses. Factual parameters include:
- SIP Frequencies: While monthly frequency is the most common option in India, AMCs also offer daily, weekly, fortnightly, quarterly, and semi-annual SIP frequencies.
- Auto-Debit Mandate: Installments are automated using NACH (National Automated Clearing House) mandates or e-mandates linked to the investor's bank account.
- No Pre-payment Penalty: Unlike loan EMIs, there is no penalty or charge if you choose to stop, pause, or skip a mutual fund SIP installment.