SIP (Systematic Investment Plan) is a facility offered by mutual fund schemes that allows investors to contribute a fixed rupee amount at a chosen frequency — monthly, fortnightly, or weekly — with each instalment purchasing units at the NAV applicable on that date.
Definition
Under a SIP, an investor registers an ECS/NACH auto-debit mandate with an authorised dealer bank. On each SIP date the bank debits the specified amount, the AMC allots units at the day's NAV, and the transaction appears in the statement of account. AMFI reports that as of March 2026 the Indian mutual fund industry processes over 10 crore active SIP accounts aggregating approximately ₹25,000 crore per month in inflows, making it the dominant mode of retail equity investment in India.
A SIP is not a separate product or fund category — it is a transaction instruction layered on top of any eligible open-ended scheme. The same scheme can be held via SIP, lumpsum, or STP. SIPs may be paused, modified, or cancelled at any time; there is no exit load or penalty for stopping a SIP mid-tenure (though premature redemption of accumulated units may attract exit load depending on the scheme's redemption terms and holding period).
Why it matters for investors
The primary mechanism SIP exploits is rupee-cost averaging: because a fixed rupee amount buys more units when NAV is low and fewer when NAV is high, the average purchase cost per unit over a full market cycle tends to be lower than the average NAV over the same period. This does not eliminate risk — a prolonged one-directional bear market reduces this benefit — but across typical equity market volatility (boom-bust cycles of 2–5 years), the averaging effect has historically smoothed entry cost. Investors who track their SIP portfolios using XIRR rather than simple absolute return get an accurate annualised picture that accounts for the time-weighted nature of irregular contributions.
SIP also enforces investment discipline: automating contributions removes the behavioural bias of waiting for "the right time to invest." SEBI's investor education framework consistently highlights SIP as the preferred starting point for first-time mutual fund investors precisely because it decouples the investment decision from short-term market sentiment.
Worked example
Scenario: Divya begins a monthly SIP of ₹10,000 in a diversified equity fund on 1 April 2021. She invests for 48 months (April 2021 – March 2025), contributing ₹4,80,000 in total.
Rupee-cost averaging mechanics (abbreviated):
- April 2021 — NAV ₹50.00 → units allotted: 200.00
- December 2021 — NAV ₹62.50 → units allotted: 160.00
- June 2022 (correction) — NAV ₹42.00 → units allotted: 238.10
- March 2025 — NAV ₹72.30 → units allotted: 138.31
Total units accumulated (illustrative): ~8,640 units at an average purchase NAV of ₹55.55 (₹4,80,000 ÷ 8,640). Final value at March 2025 NAV of ₹72.30: 8,640 × ₹72.30 = ₹6,24,672.
XIRR: Running the 49 dated cash flows through =XIRR() yields approximately 14.2% p.a. — meaningfully different from the simple absolute return of (6,24,672 − 4,80,000) ÷ 4,80,000 = 30.1%, which ignores that early instalments had 4 years to compound while the last had zero days.
Note: This example uses illustrative figures. Past performance is not indicative of future returns.
See also
- STP (Systematic Transfer Plan) — transfer from one fund to another at regular intervals; often used to deploy lumpsum into equity gradually
- SWP (Systematic Withdrawal Plan) — mirror of SIP; withdraws at regular intervals instead of investing
- XIRR — correct return metric for SIP portfolios with irregular dated cash flows
- SIP Investing in India — Complete Guide
- Nifty 50 Index Fund — live SIP calculator and NAV history
Primary source
AMFI SIP data: amfiindia.com — SIP Data (monthly inflows and account count). SEBI Circular SEBI/HO/IMD/DF3/CIR/P/2021/571 on SIP registration via BSE StAR MF / NSE NMF II: sebi.gov.in.
Past performance is not indicative of future returns. Mutual fund investments are subject to market risks. Read all scheme-related documents carefully. ARN-314872. Content is informational and not investment advice.